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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240627-mikrobus-scratch-spi-v5-1-9e6c148bf5f0@beagleboard.org> References: <20240627-mikrobus-scratch-spi-v5-0-9e6c148bf5f0@beagleboard.org> In-Reply-To: <20240627-mikrobus-scratch-spi-v5-0-9e6c148bf5f0@beagleboard.org> To: Mark Brown , Vaishnav M A , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Michael Walle , Andrew Lunn , jkridner@beagleboard.org, robertcnelson@beagleboard.org Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ayush Singh X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=6830; i=ayush@beagleboard.org; h=from:subject:message-id; bh=9/rpedcTTyGMwyn6LHb+RIA+j2zaGfGSP/fqzhrUXJo=; b=owEBbQKS/ZANAwAIAQXO9ceJ5Vp0AcsmYgBmfZM3CjLemMfmgtRjyAG+QFAnKzW5YgCMcFF4n thEWPBvvdCJAjMEAAEIAB0WIQTfzBMe8k8tZW+lBNYFzvXHieVadAUCZn2TNwAKCRAFzvXHieVa dMDYD/4qz46wFWZWzewi7xIKhBYFSdUuNPu3Z/RnnoAeeEPwArGJMiHZAgbjUWU+Ss7Cizf8eyR Ghzs5yQcnk7cZ0bYK1EBrmvgQW2mAAvni1UHQrUo+4QmgKdt5r8h8F1btWDqxXDBBnAWsSFK9dp eYEe631gu90oesxwkH8j2bqEYw5p1AIAzjbsB6D+d35TOuaQsTasS/CNRmD978KM9+2usW9bu34 82hFjsGAaRdvWAZqKoD5lgFjyajIZXUOxdCguTssgsnTqUU8KtKNJew+0h3iKaOqtKS30fXPdSg cGLrTs2vWrnZh5TCoCv5XjOp//vicjb3aoyQlKMIIweGS+AjgieyrMyRkPakGchUStJmsAxGkDs eo2RBvog3OT9WtWy41N5rMiYIfrW3YA+fBsQylUGKM9/AGDMHwJG+aB08E8yHoqHoPcseHbspUy CmjNihxQt3+nGfq6KC36pCJ7EnInom62np4vafwCvqRvW6aIupMw46jBu+YMKHXD3Xf2kXwoto/ qGfPDTQeco5wFTt1AtEJb/cfESmGI7XLJtLFFahpRq62X+KScegeTDRCQi9nsI8XLB9HYFUAsVf yMbONuFSltU+KjMk/PzoMcJ4iVt+AZswu6UPVplECqGyrbA4352882O7JqRQrWoB2pDzKL3OIBN 4TT4yCa5LCVqZ7A== X-Developer-Key: i=ayush@beagleboard.org; a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 Add DT bindings for mikroBUS interface. MikroBUS is an open standard developed by MikroElektronika for connecting add-on boards to microcontrollers or microprocessors. mikroBUS is a connector and does not have a controller. Instead the software is responsible for identification of board and setting up uart, spi, i2c, pwm and other buses. Additionally, some new mikroBUS boards contain 1-wire EEPROM that contains a manifest to describe the addon board to provide plug and play capabilities. A mikroBUS addon board is free to leave some of the pins unused which are marked as NC or Not Connected. Some of the pins might need to be configured as GPIOs deviating from their reserved purposes Eg: SHT15 Click where the SCL and SDA Pins need to be configured as GPIOs for the driver (drivers/hwmon/sht15.c) to work. For some add-on boards the driver may not take care of some additional signals like reset/wake-up/other. Eg: ENC28J60 click where the reset line (RST pin on the mikrobus port) needs to be pulled high. Some SPI addon boards use other pins like RST, AN etc as chipselect (eg. SPI Extend Click). Thus, `spi-cs` and `spi-cs-names` property is added to allow mikroBUS addon board to specify chipselect by name. Here's the list of pins in mikroBUS connector: AN - Analog RST - Reset CS - SPI Chip Select SCK - SPI Clock MISO - SPI Master Input Slave Output MOSI - SPI Master Output Slave Input +3.3V - VCC-3.3V power GND - Reference Ground PWM - PWM output INT - Hardware Interrupt RX - UART Receive TX - UART Transmit SCL - I2C Clock SDA - I2C Data +5V - VCC-5V power GND - Reference Ground Link: https://www.mikroe.com/mikrobus Link: https://download.mikroe.com/documents/standards/mikrobus/mikrobus-standard-= specification-v200.pdf mikroBUS specification Link: https://www.mikroe.com/sht1x-click SHT15 Click Link: https://www.mikroe.com/eth-click ENC28J60 Click Link: https://www.mikroe.com/spi-extend-click SPI Extend Click Co-developed-by: Vaishnav M A Signed-off-by: Vaishnav M A Signed-off-by: Ayush Singh --- .../bindings/connector/mikrobus-connector.yaml | 107 +++++++++++++++++= ++++ MAINTAINERS | 6 ++ 2 files changed, 113 insertions(+) diff --git a/Documentation/devicetree/bindings/connector/mikrobus-connector= .yaml b/Documentation/devicetree/bindings/connector/mikrobus-connector.yaml new file mode 100644 index 000000000000..033479f8604f --- /dev/null +++ b/Documentation/devicetree/bindings/connector/mikrobus-connector.yaml @@ -0,0 +1,107 @@ +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/connector/mikrobus-connector.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: mikroBUS add-on board connector + +maintainers: + - Ayush Singh + +properties: + compatible: + const: mikrobus-connector + + pinctrl-0: true + pinctrl-1: true + pinctrl-2: true + pinctrl-3: true + pinctrl-4: true + pinctrl-5: true + pinctrl-6: true + pinctrl-7: true + pinctrl-8: true + + pinctrl-names: + minItems: 1 + maxItems: 9 + items: + enum: [default, pwm_default, pwm_gpio, uart_default, uart_gpio, i2c_= default, i2c_gpio, spi_default, + spi_gpio] + + spi-controller: + description: spi-controller of mikroBUS SPI pins along with cs pins. + $ref: /schemas/types.yaml#/definitions/phandle + + spi-cs: + description: spi chip-select corresponding to the chip-selects on the = mikrobus socket. + $ref: /schemas/types.yaml#/definitions/uint32-array + + spi-cs-names: + minItems: 1 + maxItems: 12 + items: + enum: [default, pwm, int, rx, tx, scl, sda, an, rst, sck, cipo, copi] + + i2c-controller: + description: i2c controller attached to the mikrobus socket. + $ref: /schemas/types.yaml#/definitions/phandle + + uart-controller: + description: uart controller attached to the mikrobus socket + $ref: /schemas/types.yaml#/definitions/phandle + + pwms: + description: the pwm-controller corresponding to the mikroBUS PWM pin. + maxItems: 1 + + mikrobus-gpios: + minItems: 1 + maxItems: 12 + + mikrobus-gpio-names: + minItems: 1 + maxItems: 12 + items: + enum: [pwm, int, rx, tx, scl, sda, an, rst, cs, sck, cipo, copi] + + board: + description: board attached to mikrobus connector + $ref: /schemas/types.yaml#/definitions/phandle-array + +required: + - compatible + - pinctrl-0 + +additionalProperties: false + +examples: + - | + #include + mikrobus { + compatible =3D "mikrobus-connector"; + pinctrl-names =3D "default", "pwm_default", "pwm_gpio","uart_default= ", "uart_gpio", "i2c_default", + "i2c_gpio", "spi_default", "spi_gpio"; + pinctrl-0 =3D <&P2_03_gpio_input_pin &P1_04_gpio_pin &P1_02_gpio_pin= >; + pinctrl-1 =3D <&P2_01_pwm_pin>; + pinctrl-2 =3D <&P2_01_gpio_pin>; + pinctrl-3 =3D <&P2_05_uart_pin &P2_07_uart_pin>; + pinctrl-4 =3D <&P2_05_gpio_pin &P2_07_gpio_pin>; + pinctrl-5 =3D <&P2_09_i2c_pin &P2_11_i2c_pin>; + pinctrl-6 =3D <&P2_09_gpio_pin &P2_11_gpio_pin>; + pinctrl-7 =3D <&P1_12_spi_pin &P1_10_spi_pin &P1_08_spi_sclk_pin &P1= _06_spi_cs_pin>; + pinctrl-8 =3D <&P1_12_gpio_pin &P1_10_gpio_pin &P1_08_gpio_pin &P1_0= 6_gpio_pin>; + pwms =3D <&ehrpwm1 0 500000 0>; + i2c-controller =3D <&i2c1>; + uart-controller =3D <&uart1>; + spi-controller =3D <&spi1>; + spi-cs =3D <0 1>; + spi-cs-names =3D "default", "rst"; + mikrobus-gpios =3D <&gpio1 18 GPIO_ACTIVE_HIGH>, <&gpio0 23 GPIO_ACT= IVE_HIGH>, + <&gpio0 30 GPIO_ACTIVE_HIGH>, <&gpio0 31 GPIO_ACTIV= E_HIGH>, + <&gpio0 15 GPIO_ACTIVE_HIGH>, <&gpio0 14 GPIO_ACTIV= E_HIGH>, + <&gpio0 4 GPIO_ACTIVE_HIGH>, <&gpio0 3 GPIO_ACTIVE_= HIGH>, + <&gpio0 2 GPIO_ACTIVE_HIGH>, <&gpio0 5 GPIO_ACTIVE_= HIGH>, + <&gpio2 25 GPIO_ACTIVE_HIGH>, <&gpio2 3 GPIO_ACTIVE= _HIGH>; 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Thu, 27 Jun 2024 09:28:59 -0700 (PDT) From: Ayush Singh Date: Thu, 27 Jun 2024 21:56:12 +0530 Subject: [PATCH v5 2/7] dt-bindings: mikrobus: Add mikrobus board base Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240627-mikrobus-scratch-spi-v5-2-9e6c148bf5f0@beagleboard.org> References: <20240627-mikrobus-scratch-spi-v5-0-9e6c148bf5f0@beagleboard.org> In-Reply-To: <20240627-mikrobus-scratch-spi-v5-0-9e6c148bf5f0@beagleboard.org> To: Mark Brown , Vaishnav M A , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Michael Walle , Andrew Lunn , jkridner@beagleboard.org, robertcnelson@beagleboard.org Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ayush Singh X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; 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a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 Base dt bindings for mikrobus addon boards. Contains properties that are part of all types of boards (SPI, I2C, etc). Each pin in mikroBUS connector can either be used for it's original purpose (UART, I2C, SPI, etc) or as a normal GPIO. Introducing `pinctrl-apply` allows selecting the pin configuration by name. Note: Some mikrobus-connectors might not support all valid pinctrl. Signed-off-by: Ayush Singh --- .../devicetree/bindings/mikrobus/mikrobus-board.yaml | 20 ++++++++++++++++= ++++ MAINTAINERS | 1 + 2 files changed, 21 insertions(+) diff --git a/Documentation/devicetree/bindings/mikrobus/mikrobus-board.yaml= b/Documentation/devicetree/bindings/mikrobus/mikrobus-board.yaml new file mode 100644 index 000000000000..42e2219c596f --- /dev/null +++ b/Documentation/devicetree/bindings/mikrobus/mikrobus-board.yaml @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mikrobus/mikrobus-board.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: mikroBUS add-on board properties + +maintainers: + - Ayush Singh + +properties: + pinctrl-apply: + minItems: 1 + maxItems: 9 + items: + enum: [default, pwm_default, pwm_gpio, uart_default, uart_gpio, i2c_= default, i2c_gpio, spi_default, + spi_gpio] + +additionalProperties: false diff --git a/MAINTAINERS b/MAINTAINERS index 8e4115e93aeb..14eba18832d5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15113,6 +15113,7 @@ M: Ayush Singh M: Vaishnav M A S: Maintained F: Documentation/devicetree/bindings/connector/mikrobus-connector.yaml +F: Documentation/devicetree/bindings/mikrobus/mikrobus-board.yaml =20 MIKROTIK CRS3XX 98DX3236 BOARD SUPPORT M: Luka Kovacic --=20 2.45.2 From nobody Thu Dec 18 18:00:24 2025 Received: from mail-pf1-f175.google.com (mail-pf1-f175.google.com [209.85.210.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B34FC19A298 for ; 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a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 Add bindings for MikroBUS boards using SPI interface. Almost all of the properties that are valid for SPI devices can be used except reg. Since the goal is to allow use of the same MikroBUS board across different connectors, config needs to be independent of the actual SPI controller in mikroBUS port(s), it is not possible to define the chipselect by number in advance. Thus, `spi-cs-apply` property is used to specify the chipselect(s) by name. Another important fact is that while there is a CS pin in the mikroBUS connector, some boards (eg SPI Extend Click) use additional pins as chipselect. Thus we need a way to specify the CS pin(s) in terms of mikcrobus-connector which can then handle bindings the actual CS pin(s). Link: https://www.mikroe.com/spi-extend-click SPI Extend Click Signed-off-by: Ayush Singh --- .../devicetree/bindings/mikrobus/mikrobus-spi.yaml | 37 ++++++++++++++++++= ++++ MAINTAINERS | 1 + 2 files changed, 38 insertions(+) diff --git a/Documentation/devicetree/bindings/mikrobus/mikrobus-spi.yaml b= /Documentation/devicetree/bindings/mikrobus/mikrobus-spi.yaml new file mode 100644 index 000000000000..35ca2cce3b03 --- /dev/null +++ b/Documentation/devicetree/bindings/mikrobus/mikrobus-spi.yaml @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mikrobus/mikrobus-spi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: mikroBUS add-on board using SPI + +maintainers: + - Ayush Singh + +allOf: + - $ref: /schemas/mikrobus/mikrobus-board.yaml# + +properties: + compatible: + const: mikrobus-spi + + spi-cs-apply: + minItems: 1 + maxItems: 12 + items: + enum: [default, pwm, int, rx, tx, scl, sda, an, rst, sck, cipo, copi] + +required: + - compatible + +additionalProperties: false + +examples: + - | + thermo-click { + compatible =3D "maxim,max31855k", "mikrobus,spi"; 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a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 From: Ayush Singh DONOTMERGE Externalize and export the symbol of_find_spi_controller_by_node() from the SPI core akin to how of_find_i2c_adapter_by_node() is already available. Also, move it under a CONFIG_OF. Signed-off-by: Ayush Singh --- drivers/spi/spi.c | 206 ++++++++++++++++++++++++--------------------= ---- include/linux/spi/spi.h | 4 + 2 files changed, 108 insertions(+), 102 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 54cbe652a4df..565b2e2dd5b9 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2340,6 +2340,93 @@ void spi_flush_queue(struct spi_controller *ctlr) =20 /*------------------------------------------------------------------------= -*/ =20 +static void spi_controller_release(struct device *dev) +{ + struct spi_controller *ctlr; + + ctlr =3D container_of(dev, struct spi_controller, dev); + kfree(ctlr); +} + +static struct class spi_master_class =3D { + .name =3D "spi_master", + .dev_release =3D spi_controller_release, + .dev_groups =3D spi_master_groups, +}; + +static ssize_t slave_show(struct device *dev, struct device_attribute *att= r, + char *buf) +{ + struct spi_controller *ctlr =3D container_of(dev, struct spi_controller, + dev); + struct device *child; + + child =3D device_find_any_child(&ctlr->dev); + return sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : N= ULL); +} + +static ssize_t slave_store(struct device *dev, struct device_attribute *at= tr, + const char *buf, size_t count) +{ + struct spi_controller *ctlr =3D container_of(dev, struct spi_controller, + dev); + struct spi_device *spi; + struct device *child; + char name[32]; + int rc; + + rc =3D sscanf(buf, "%31s", name); + if (rc !=3D 1 || !name[0]) + return -EINVAL; + + child =3D device_find_any_child(&ctlr->dev); + if (child) { + /* Remove registered slave */ + device_unregister(child); + put_device(child); + } + + if (strcmp(name, "(null)")) { + /* Register new slave */ + spi =3D spi_alloc_device(ctlr); + if (!spi) + return -ENOMEM; + + strscpy(spi->modalias, name, sizeof(spi->modalias)); + + rc =3D spi_add_device(spi); + if (rc) { + spi_dev_put(spi); + return rc; + } + } + + return count; +} + +static DEVICE_ATTR_RW(slave); + +static struct attribute *spi_slave_attrs[] =3D { + &dev_attr_slave.attr, + NULL, +}; + +static const struct attribute_group spi_slave_group =3D { + .attrs =3D spi_slave_attrs, +}; + +static const struct attribute_group *spi_slave_groups[] =3D { + &spi_controller_statistics_group, + &spi_slave_group, + NULL, +}; + +static struct class spi_slave_class =3D { + .name =3D "spi_slave", + .dev_release =3D spi_controller_release, + .dev_groups =3D spi_slave_groups, +}; + #if defined(CONFIG_OF) static void of_spi_parse_dt_cs_delay(struct device_node *nc, struct spi_delay *delay, const char *prop) @@ -2549,6 +2636,23 @@ static void of_register_spi_devices(struct spi_contr= oller *ctlr) } } } + +/* The spi controllers are not using spi_bus, so we find it with another w= ay */ +struct spi_controller *of_find_spi_controller_by_node(struct device_node *= node) +{ + struct device *dev; + + dev =3D class_find_device_by_of_node(&spi_master_class, node); + if (!dev && IS_ENABLED(CONFIG_SPI_SLAVE)) + dev =3D class_find_device_by_of_node(&spi_slave_class, node); + if (!dev) + return NULL; + + /* Reference got in class_find_device */ + return container_of(dev, struct spi_controller, dev); +} +EXPORT_SYMBOL_GPL(of_find_spi_controller_by_node); + #else static void of_register_spi_devices(struct spi_controller *ctlr) { } #endif @@ -2917,20 +3021,6 @@ static void acpi_register_spi_devices(struct spi_con= troller *ctlr) static inline void acpi_register_spi_devices(struct spi_controller *ctlr) = {} #endif /* CONFIG_ACPI */ =20 -static void spi_controller_release(struct device *dev) -{ - struct spi_controller *ctlr; - - ctlr =3D container_of(dev, struct spi_controller, dev); - kfree(ctlr); -} - -static struct class spi_master_class =3D { - .name =3D "spi_master", - .dev_release =3D spi_controller_release, - .dev_groups =3D spi_master_groups, -}; - #ifdef CONFIG_SPI_SLAVE /** * spi_slave_abort - abort the ongoing transfer request on an SPI slave @@ -2958,79 +3048,6 @@ int spi_target_abort(struct spi_device *spi) return -ENOTSUPP; } EXPORT_SYMBOL_GPL(spi_target_abort); - -static ssize_t slave_show(struct device *dev, struct device_attribute *att= r, - char *buf) -{ - struct spi_controller *ctlr =3D container_of(dev, struct spi_controller, - dev); - struct device *child; - - child =3D device_find_any_child(&ctlr->dev); - return sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : N= ULL); -} - -static ssize_t slave_store(struct device *dev, struct device_attribute *at= tr, - const char *buf, size_t count) -{ - struct spi_controller *ctlr =3D container_of(dev, struct spi_controller, - dev); - struct spi_device *spi; - struct device *child; - char name[32]; - int rc; - - rc =3D sscanf(buf, "%31s", name); - if (rc !=3D 1 || !name[0]) - return -EINVAL; - - child =3D device_find_any_child(&ctlr->dev); - if (child) { - /* Remove registered slave */ - device_unregister(child); - put_device(child); - } - - if (strcmp(name, "(null)")) { - /* Register new slave */ - spi =3D spi_alloc_device(ctlr); - if (!spi) - return -ENOMEM; - - strscpy(spi->modalias, name, sizeof(spi->modalias)); - - rc =3D spi_add_device(spi); - if (rc) { - spi_dev_put(spi); - return rc; - } - } - - return count; -} - -static DEVICE_ATTR_RW(slave); - -static struct attribute *spi_slave_attrs[] =3D { - &dev_attr_slave.attr, - NULL, -}; - -static const struct attribute_group spi_slave_group =3D { - .attrs =3D spi_slave_attrs, -}; - -static const struct attribute_group *spi_slave_groups[] =3D { - &spi_controller_statistics_group, - &spi_slave_group, - NULL, -}; - -static struct class spi_slave_class =3D { - .name =3D "spi_slave", - .dev_release =3D spi_controller_release, - .dev_groups =3D spi_slave_groups, -}; #else extern struct class spi_slave_class; /* dummy */ #endif @@ -4720,21 +4737,6 @@ static struct spi_device *of_find_spi_device_by_node= (struct device_node *node) return dev ? to_spi_device(dev) : NULL; } =20 -/* The spi controllers are not using spi_bus, so we find it with another w= ay */ -static struct spi_controller *of_find_spi_controller_by_node(struct device= _node *node) -{ - struct device *dev; - - dev =3D class_find_device_by_of_node(&spi_master_class, node); - if (!dev && IS_ENABLED(CONFIG_SPI_SLAVE)) - dev =3D class_find_device_by_of_node(&spi_slave_class, node); - if (!dev) - return NULL; - - /* Reference got in class_find_device */ - return container_of(dev, struct spi_controller, dev); 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a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 DONOTMERGE Export of_register_spi_device() from SPI Core to allow registering SPI devices from device tree when the device node is not a child node of spi controller. Signed-off-by: Ayush Singh --- drivers/spi/spi.c | 3 ++- include/linux/spi/spi.h | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 565b2e2dd5b9..8cd4d61958a2 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2566,7 +2566,7 @@ static int of_spi_parse_dt(struct spi_controller *ctl= r, struct spi_device *spi, return 0; } =20 -static struct spi_device * +struct spi_device * of_register_spi_device(struct spi_controller *ctlr, struct device_node *nc) { struct spi_device *spi; @@ -2612,6 +2612,7 @@ of_register_spi_device(struct spi_controller *ctlr, s= truct device_node *nc) spi_dev_put(spi); return ERR_PTR(rc); } +EXPORT_SYMBOL_GPL(of_register_spi_device); =20 /** * of_register_spi_devices() - Register child devices onto the SPI bus diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 58e692226475..861b1cb4cca6 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -1686,6 +1686,9 @@ spi_transfer_is_last(struct spi_controller *ctlr, str= uct spi_transfer *xfer) =20 #if IS_ENABLED(CONFIG_OF) struct spi_controller *of_find_spi_controller_by_node(struct device_node *= node); 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Thu, 27 Jun 2024 09:29:25 -0700 (PDT) From: Ayush Singh Date: Thu, 27 Jun 2024 21:56:16 +0530 Subject: [PATCH v5 6/7] mikrobus: Add mikroBUS driver Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240627-mikrobus-scratch-spi-v5-6-9e6c148bf5f0@beagleboard.org> References: <20240627-mikrobus-scratch-spi-v5-0-9e6c148bf5f0@beagleboard.org> In-Reply-To: <20240627-mikrobus-scratch-spi-v5-0-9e6c148bf5f0@beagleboard.org> To: Mark Brown , Vaishnav M A , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Michael Walle , Andrew Lunn , jkridner@beagleboard.org, robertcnelson@beagleboard.org Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ayush Singh X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; 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a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 Adds support for SPI mikroBUS addon boards with configuration based on device tree. The goal is to get a minimal version in mainline to sort out the device tree structure that should be used. A mikroBUS board can use any combination of the following based protocols: I2C, SPI, UART, PWM, Analog, GPIO with possibility of all pins being used as GPIO instead of their original purpose. This requires the driver to be flexible and identify the type of board based on the compatible string. Signed-off-by: Ayush Singh --- MAINTAINERS | 1 + drivers/misc/Kconfig | 16 +++ drivers/misc/Makefile | 1 + drivers/misc/mikrobus.c | 361 ++++++++++++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 379 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 88f2b3adc824..01a0ac261e6c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15115,6 +15115,7 @@ S: Maintained F: Documentation/devicetree/bindings/connector/mikrobus-connector.yaml F: Documentation/devicetree/bindings/mikrobus/mikrobus-board.yaml F: Documentation/devicetree/bindings/mikrobus/mikrobus-spi.yaml +F: drivers/misc/mikrobus.c =20 MIKROTIK CRS3XX 98DX3236 BOARD SUPPORT M: Luka Kovacic diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index faf983680040..320f408cc612 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -585,6 +585,22 @@ config NSM To compile this driver as a module, choose M here. The module will be called nsm. =20 +menuconfig MIKROBUS + tristate "Module for instantiating devices on mikroBUS ports" + depends on GPIOLIB + help + This option enables the mikroBUS driver. mikroBUS is an add-on + board socket standard that offers maximum expandability with + the smallest number of pins. The mikroBUS driver instantiates + devices on a mikroBUS port described mikroBUS manifest which is + passed using a sysfs interface. + + + Say Y here to enable support for this driver. + + To compile this code as a module, chose M here: the module + will be called mikrobus.ko + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 153a3f4837e8..f10f1414270b 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -69,3 +69,4 @@ obj-$(CONFIG_TMR_INJECT) +=3D xilinx_tmr_inject.o obj-$(CONFIG_TPS6594_ESM) +=3D tps6594-esm.o obj-$(CONFIG_TPS6594_PFSM) +=3D tps6594-pfsm.o obj-$(CONFIG_NSM) +=3D nsm.o +obj-$(CONFIG_MIKROBUS) +=3D mikrobus.o diff --git a/drivers/misc/mikrobus.c b/drivers/misc/mikrobus.c new file mode 100644 index 000000000000..bf160a0e8903 --- /dev/null +++ b/drivers/misc/mikrobus.c @@ -0,0 +1,361 @@ +// SPDX-License-Identifier: GPL-2.0: +/* + * Copyright 2024 Ayush Singh + */ + +#define pr_fmt(fmt) "mikrobus:%s: " fmt, __func__ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct mikrobus_spi_cs_item { + const char *cs_name; + u32 cs; +}; + +/** + * struct mikrobus_port - MikroBUS Driver + * + * @dev: underlying platform_device + * @board_ocs: board device tree changeset + * @pinctrl: mikroBUS pinctrl + * @mikrobus_spi_cs: list of supported chipselect address and name + * @mikrobus_spi_cs_count: length of mikrobus_spi_cs + * @spi_ctrl: spi controller of mikroBUS connector + * @spi_dev: spi mikroBUS board + */ +struct mikrobus_port { + struct platform_device *dev; + struct of_changeset board_ocs; + struct pinctrl *pctrl; + + struct mikrobus_spi_cs_item *spi_cs; + int spi_cs_count; + struct spi_controller *spi_ctrl; + struct spi_device *spi_dev; +}; + +/* + * mikrobus_pinctrl_select: Select pinctrl state for mikrobus pin + * + * @port: mikrobus port + * @pinctrl_selected: pinctrl state to be selected + */ +static int mikrobus_pinctrl_select(struct device *dev, + const char *pinctrl_selected) +{ + int ret; + struct pinctrl_state *state; + struct mikrobus_port *mb =3D dev_get_drvdata(dev); + + state =3D pinctrl_lookup_state(mb->pctrl, pinctrl_selected); + if (IS_ERR(state)) + return dev_err_probe(dev, PTR_ERR(state), + "failed to find state %s", + pinctrl_selected); + + ret =3D pinctrl_select_state(mb->pctrl, state); + if (ret) + return dev_err_probe(dev, ret, "failed to select state %s", + pinctrl_selected); + + dev_dbg_ratelimited(dev, "setting pinctrl %s", pinctrl_selected); + + return 0; +} + +/* + * mikrobus_lookup_cs - lookup mikroBUS SPI chipselect by name + * + * @mb: mikroBUS port + * @cs_name: chipselect name + */ +static int mikrobus_lookup_cs(const struct mikrobus_port *mb, + const char *cs_name) +{ + for (int i =3D 0; i < mb->spi_cs_count; ++i) { + if (strcmp(cs_name, mb->spi_cs[i].cs_name) =3D=3D 0) + return mb->spi_cs[i].cs; + } + + return -1; +} + +static int mikrobus_spi_set_cs(struct device *dev, struct device_node *np) +{ + struct mikrobus_port *mb =3D dev_get_drvdata(dev); + const char *temp_str; + int reg_len; + int ret, i; + u32 *reg =3D NULL; + + reg_len =3D of_property_count_strings(np, "spi-cs"); + /* Use default cs if spi-cs property not present */ + if (reg_len <=3D 0) { + reg_len =3D 1; + reg =3D devm_kmalloc_array(dev, reg_len, sizeof(*reg), + GFP_KERNEL); + if (!reg) + return -ENOMEM; + + ret =3D mikrobus_lookup_cs(mb, "default"); + if (ret < 0) + goto free_reg; + + reg[0] =3D ret; + } else { + reg =3D devm_kmalloc_array(dev, reg_len, sizeof(*reg), + GFP_KERNEL); + if (!reg) + return -ENOMEM; + + for (i =3D 0; i < reg_len; ++i) { + ret =3D of_property_read_string_index(np, "spi-cs", i, + &temp_str); + if (ret < 0) + goto free_reg; + + ret =3D mikrobus_lookup_cs(mb, temp_str); + if (ret < 0) + goto free_reg; + + reg[i] =3D ret; + } + } + + ret =3D of_changeset_add_prop_u32_array(&mb->board_ocs, np, "reg", reg, + reg_len); + if (ret < 0) + goto free_reg; + + ret =3D of_changeset_apply(&mb->board_ocs); + if (ret < 0) + goto free_reg; + + devm_kfree(dev, reg); + return 0; + +free_reg: + devm_kfree(dev, reg); + return ret; +} + +static int of_register_mikrobus_device(struct mikrobus_port *mb, + struct device_node *np) +{ + const char *temp_str; + int i, pinctrl_count, ret; + struct spi_device *spi_dev; + struct device *dev =3D &mb->dev->dev; + + pinctrl_count =3D of_property_count_strings(np, "pinctrl-apply"); + if (pinctrl_count < 0) + return dev_err_probe(dev, pinctrl_count, + "Missing required property pinctrl-apply"); + + for (i =3D 0; i < pinctrl_count; ++i) { + ret =3D of_property_read_string_index(np, "pinctrl-apply", i, + &temp_str); + if (ret < 0) + return ret; + + ret =3D mikrobus_pinctrl_select(dev, temp_str); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to set pinctrl"); + } + + if (mb->spi_ctrl && !mb->spi_dev && + of_device_is_compatible(np, "mikrobus-spi")) { + ret =3D mikrobus_spi_set_cs(dev, np); + if (ret < 0) + return dev_err_probe(dev, ret, + "Failed to set SPI chipselect"); + + spi_dev =3D of_register_spi_device(mb->spi_ctrl, np); + if (IS_ERR(spi_dev)) + return dev_err_probe(dev, PTR_ERR(spi_dev), + "Failed to register SPI device"); + mb->spi_dev =3D spi_dev; + } + + return 0; +} + +static int of_register_mikrobus_board(struct mikrobus_port *mb) +{ + struct device *dev =3D &mb->dev->dev; + int board_len, i, ret; + struct device_node *np; + + board_len =3D of_count_phandle_with_args(dev->of_node, "board", NULL); + for (i =3D 0; i < board_len; ++i) { + np =3D of_parse_phandle(dev->of_node, "board", i); + if (!np) { + ret =3D dev_err_probe(dev, -ENODEV, "Board not found"); + goto free_np; + } + + ret =3D of_register_mikrobus_device(mb, np); + if (ret < 0) + goto free_np; + + of_node_put(np); + } + + return 0; +free_np: + of_node_put(np); + return ret; +} + +static int mikrobus_port_probe(struct platform_device *pdev) +{ + int ret, i; + struct mikrobus_port *mb; + struct device_node *np; + struct device *dev =3D &pdev->dev; + + mb =3D devm_kmalloc(dev, sizeof(*mb), GFP_KERNEL); + if (!mb) + return -ENOMEM; + + dev_set_drvdata(dev, mb); + + of_changeset_init(&mb->board_ocs); + mb->dev =3D pdev; + mb->pctrl =3D NULL; + mb->spi_ctrl =3D NULL; + mb->spi_dev =3D NULL; + mb->spi_cs =3D NULL; + mb->spi_cs_count =3D 0; + + mb->pctrl =3D devm_pinctrl_get(dev); + if (IS_ERR(mb->pctrl)) + return dev_err_probe(dev, PTR_ERR(mb->pctrl), + "failed to get pinctrl [%ld]", + PTR_ERR(mb->pctrl)); + + np =3D of_parse_phandle(dev->of_node, "spi-controller", 0); + if (np) { + mb->spi_ctrl =3D of_find_spi_controller_by_node(np); + if (mb->spi_ctrl) { + ret =3D of_property_count_u32_elems(dev->of_node, + "spi-cs"); + if (ret < 0) { + dev_err(dev, "Missing property spi-cs"); + goto free_np; + } + + mb->spi_cs_count =3D ret; + + ret =3D of_property_count_strings(dev->of_node, + "spi-cs-names"); + if (ret < 0) { + dev_err(dev, "Missing property spi-cs-names"); + goto free_np; + } + + if (mb->spi_cs_count !=3D ret) { + ret =3D dev_err_probe( + dev, -EINVAL, + "spi-cs and spi-cs-names out of sync"); + goto free_np; + } + + mb->spi_cs =3D devm_kmalloc_array(dev, mb->spi_cs_count, + sizeof(*mb->spi_cs), + GFP_KERNEL); + if (!mb->spi_cs) { + ret =3D -ENOMEM; + goto free_np; + } + + for (i =3D 0; i < mb->spi_cs_count; ++i) { + of_property_read_u32_index(dev->of_node, + "spi-cs", i, + &mb->spi_cs->cs); + of_property_read_string_index( + dev->of_node, "spi-cs-names", i, + &mb->spi_cs->cs_name); + } + } + } + of_node_put(np); + + ret =3D of_register_mikrobus_board(mb); + if (ret < 0) + return dev_err_probe(dev, -EINVAL, + "Failed to register mikrobus board"); + + return 0; + +free_np: + of_node_put(np); + return ret; +} + +static void mikrobus_port_remove(struct platform_device *pdev) +{ + struct mikrobus_port *mb =3D dev_get_drvdata(&pdev->dev); + + spi_unregister_device(mb->spi_dev); + + of_changeset_revert(&mb->board_ocs); +} + +static const struct of_device_id mikrobus_port_of_match[] =3D { + { .compatible =3D "mikrobus-connector" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mikrobus_port_of_match); + +static struct platform_driver mikrobus_port_driver =3D { + .probe =3D mikrobus_port_probe, + .remove =3D mikrobus_port_remove, + .driver =3D { + .name =3D "mikrobus", + .of_match_table =3D mikrobus_port_of_match, + }, +}; + +static const struct bus_type mikrobus_bus_type =3D { + .name =3D "mikrobus", +}; + +static int mikrobus_init(void) +{ + int ret; + + ret =3D bus_register(&mikrobus_bus_type); 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a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 DONOTMERGE Add mikroBUS connector and some mikroBUS boards support for Beagleplay. The mikroBUS boards node should probably be moved to a more appropriate location but I am not quite sure where it should go since it is not dependent on specific arch. Signed-off-by: Ayush Singh --- arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts | 94 ++++++++++++++++++++++= +--- 1 file changed, 86 insertions(+), 8 deletions(-) diff --git a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts b/arch/arm64/bo= ot/dts/ti/k3-am625-beagleplay.dts index 70de288d728e..3f3cd70345c4 100644 --- a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts +++ b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts @@ -38,6 +38,7 @@ aliases { serial2 =3D &main_uart0; usb0 =3D &usb0; usb1 =3D &usb1; + mikrobus0 =3D &mikrobus0; }; =20 chosen { @@ -227,6 +228,56 @@ simple-audio-card,codec { }; }; =20 + mikrobus0: mikrobus-connector { + compatible =3D "mikrobus-connector"; + pinctrl-names =3D "default", "pwm_default", "pwm_gpio", + "uart_default", "uart_gpio", "i2c_default", + "i2c_gpio", "spi_default", "spi_gpio"; + pinctrl-0 =3D <&mikrobus_gpio_pins_default>; + pinctrl-1 =3D <&mikrobus_pwm_pins_default>; + pinctrl-2 =3D <&mikrobus_pwm_pins_gpio>; + pinctrl-3 =3D <&mikrobus_uart_pins_default>; + pinctrl-4 =3D <&mikrobus_uart_pins_gpio>; + pinctrl-5 =3D <&mikrobus_i2c_pins_default>; + pinctrl-6 =3D <&mikrobus_i2c_pins_gpio>; + pinctrl-7 =3D <&mikrobus_spi_pins_default>; + pinctrl-8 =3D <&mikrobus_spi_pins_gpio>; + + mikrobus-gpio-names =3D "pwm", "int", "rx", "tx", "scl", "sda", + "mosi", "miso", "sck", "cs", "rst", "an"; + mikrobus-gpios =3D <&main_gpio1 11 GPIO_ACTIVE_HIGH>, + <&main_gpio1 9 GPIO_ACTIVE_HIGH>, + <&main_gpio1 24 GPIO_ACTIVE_HIGH>, + <&main_gpio1 25 GPIO_ACTIVE_HIGH>, + <&main_gpio1 22 GPIO_ACTIVE_HIGH>, + <&main_gpio1 23 GPIO_ACTIVE_HIGH>, + <&main_gpio1 7 GPIO_ACTIVE_HIGH>, + <&main_gpio1 8 GPIO_ACTIVE_HIGH>, + <&main_gpio1 14 GPIO_ACTIVE_HIGH>, + <&main_gpio1 13 GPIO_ACTIVE_HIGH>, + <&main_gpio1 12 GPIO_ACTIVE_HIGH>, + <&main_gpio1 10 GPIO_ACTIVE_HIGH>; + + spi-controller =3D <&main_spi2>; + spi-cs =3D <0>; + spi-cs-names =3D "default"; + + board =3D <&lsm6dsl_click>; + }; + + mikrobus_boards { + thermo_click: thermo-click { + compatible =3D "maxim,max31855k", "mikrobus-spi"; + spi-max-frequency =3D <1000000>; + pinctrl-apply =3D "spi_default"; + }; + + lsm6dsl_click: lsm6dsl-click { + compatible =3D "st,lsm6ds3", "mikrobus-spi"; + spi-max-frequency =3D <1000000>; + pinctrl-apply =3D "spi_default"; + }; + }; }; =20 &main_pmx0 { @@ -387,6 +438,18 @@ AM62X_IOPAD(0x01f0, PIN_OUTPUT, 5) /* (A18) EXT_REFCLK= 1.CLKOUT0 */ >; }; =20 + mikrobus_pwm_pins_default: mikrobus-pwm-default-pins { + pinctrl-single,pins =3D < + AM62X_IOPAD(0x01a4, PIN_INPUT, 2) /* (B20) MCASP0_ACLKX.ECAP2_IN_APWM_O= UT */ + >; + }; + + mikrobus_pwm_pins_gpio: mikrobus-pwm-gpio-pins { + pinctrl-single,pins =3D < + AM62X_IOPAD(0x01a4, PIN_INPUT, 7) /* (B20) MCASP0_ACLKX.GPIO1_11 */ + >; + }; + mikrobus_i2c_pins_default: mikrobus-i2c-default-pins { pinctrl-single,pins =3D < AM62X_IOPAD(0x01d0, PIN_INPUT_PULLUP, 2) /* (A15) UART0_CTSn.I2C3_SCL */ @@ -394,6 +457,13 @@ AM62X_IOPAD(0x01d4, PIN_INPUT_PULLUP, 2) /* (B15) UART= 0_RTSn.I2C3_SDA */ >; }; =20 + mikrobus_i2c_pins_gpio: mikrobus-i2c-gpio-pins { + pinctrl-single,pins =3D < + AM62X_IOPAD(0x01d0, PIN_INPUT, 7) /* (A15) UART0_CTSn.GPIO1_22 */ + AM62X_IOPAD(0x01d4, PIN_INPUT, 7) /* (B15) UART0_RTSn.GPIO1_23 */ + >; + }; + mikrobus_uart_pins_default: mikrobus-uart-default-pins { pinctrl-single,pins =3D < AM62X_IOPAD(0x01d8, PIN_INPUT, 1) /* (C15) MCAN0_TX.UART5_RXD */ @@ -401,6 +471,13 @@ AM62X_IOPAD(0x01dc, PIN_OUTPUT, 1) /* (E15) MCAN0_RX.U= ART5_TXD */ >; }; =20 + mikrobus_uart_pins_gpio: mikrobus-uart-gpio-pins { + pinctrl-single,pins =3D < + AM62X_IOPAD(0x01d8, PIN_INPUT, 7) /* (C15) MCAN0_TX.GPIO1_24 */ + AM62X_IOPAD(0x01dc, PIN_INPUT, 7) /* (E15) MCAN0_RX.GPIO1_25 */ + >; + }; + mikrobus_spi_pins_default: mikrobus-spi-default-pins { pinctrl-single,pins =3D < AM62X_IOPAD(0x01b0, PIN_INPUT, 1) /* (A20) MCASP0_ACLKR.SPI2_CLK */ @@ -410,6 +487,15 @@ AM62X_IOPAD(0x0198, PIN_INPUT, 1) /* (A19) MCASP0_AXR2= .SPI2_D1 */ >; }; =20 + mikrobus_spi_pins_gpio: mikrobus-spi-gpio-pins { + pinctrl-single,pins =3D < + AM62X_IOPAD(0x0194, PIN_INPUT, 7) /* (B19) MCASP0_AXR3.GPIO1_7 */ + AM62X_IOPAD(0x0198, PIN_INPUT, 7) /* (A19) MCASP0_AXR2.GPIO1_8 */ + AM62X_IOPAD(0x01ac, PIN_INPUT, 7) /* (E19) MCASP0_AFSR.GPIO1_13 */ + AM62X_IOPAD(0x01b0, PIN_INPUT, 7) /* (A20) MCASP0_ACLKR.GPIO1_14 */ + >; + }; + mikrobus_gpio_pins_default: mikrobus-gpio-default-pins { bootph-all; pinctrl-single,pins =3D < @@ -630,8 +716,6 @@ &main_gpio0 { =20 &main_gpio1 { bootph-all; - pinctrl-names =3D "default"; - pinctrl-0 =3D <&mikrobus_gpio_pins_default>; gpio-line-names =3D "", "", "", "", "", /* 0-4 */ "SPE_RSTN", "SPE_INTN", "MIKROBUS_GPIO1_7", /* 5-7 */ "MIKROBUS_GPIO1_8", "MIKROBUS_GPIO1_9", /* 8-9 */ @@ -804,15 +888,11 @@ it66121_out: endpoint { }; =20 &main_i2c3 { - pinctrl-names =3D "default"; - pinctrl-0 =3D <&mikrobus_i2c_pins_default>; clock-frequency =3D <400000>; status =3D "okay"; }; =20 &main_spi2 { - pinctrl-names =3D "default"; - pinctrl-0 =3D <&mikrobus_spi_pins_default>; status =3D "okay"; }; =20 @@ -876,8 +956,6 @@ &main_uart1 { }; =20 &main_uart5 { - pinctrl-names =3D "default"; - pinctrl-0 =3D <&mikrobus_uart_pins_default>; status =3D "okay"; }; =20 --=20 2.45.2