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charset="utf-8" Remote processors may announce multiple GPIO controllers over an RPMSG channel. These GPIO controllers may require corresponding device tree nodes, especially when acting as providers, to supply phandles for their consumers. Define an RPMSG node to work as a container for a group of RPMSG channels under the imx_rproc node. Each subnode within "rpmsg" represents an individual RPMSG channel. The name of each subnode corresponds to the channel name as defined by the remote processor. All remote devices associated with a given channel are defined as child nodes under the corresponding channel node. Signed-off-by: Shenwei Wang --- .../devicetree/bindings/gpio/gpio-rpmsg.yaml | 55 +++++++++++++++++++ .../bindings/remoteproc/fsl,imx-rproc.yaml | 53 ++++++++++++++++++ 2 files changed, 108 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-rpmsg.yaml diff --git a/Documentation/devicetree/bindings/gpio/gpio-rpmsg.yaml b/Docum= entation/devicetree/bindings/gpio/gpio-rpmsg.yaml new file mode 100644 index 000000000000..6c78b6850321 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-rpmsg.yaml @@ -0,0 +1,55 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/gpio/gpio-rpmsg.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic RPMSG GPIO Controller + +maintainers: + - Shenwei Wang + +description: + On an AMP platform, some GPIO controllers are exposed by the remote proc= essor + through the RPMSG bus. The RPMSG GPIO transport protocol defines the pac= ket + structure and communication flow between Linux and the remote firmware. = Those + controllers are managed via this transport protocol. For more details of= the + protocol, check the document below. + Documentation/driver-api/gpio/gpio-rpmsg.rst + +properties: + compatible: + oneOf: + - items: + - enum: + - fsl,rpmsg-gpio + - const: rpmsg-gpio + - const: rpmsg-gpio + + reg: + description: + The reg property represents the index of the GPIO controllers. Since + the driver manages controllers on a remote system, this index tells + the remote system which controller to operate. + maxItems: 1 + + "#gpio-cells": + const: 2 + + gpio-controller: true + + interrupt-controller: true + + "#interrupt-cells": + const: 2 + +required: + - compatible + - reg + - "#gpio-cells" + - "#interrupt-cells" + +allOf: + - $ref: /schemas/gpio/gpio.yaml# + +unevaluatedProperties: false diff --git a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yam= l b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml index 57d75acb0b5e..2f9dca2b71f7 100644 --- a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml +++ b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml @@ -84,6 +84,34 @@ properties: This property is to specify the resource id of the remote processor = in SoC which supports SCFW =20 + rpmsg: + type: object + additionalProperties: false + description: + Represents the RPMSG bus between Linux and the remote system. Contai= ns + a group of RPMSG channel devices running on the bus. + + properties: + rpmsg-io-channel: + type: object + additionalProperties: false + properties: + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + + patternProperties: + "gpio@[0-9a-f]+$": + type: object + $ref: /schemas/gpio/gpio-rpmsg.yaml# + unevaluatedProperties: false + + required: + - '#address-cells' + - '#size-cells' + required: - compatible =20 @@ -146,5 +174,30 @@ examples: &mu 3 1>; memory-region =3D <&vdev0buffer>, <&vdev0vring0>, <&vdev0vring1>, <&= rsc_table>; syscon =3D <&src>; + + rpmsg { + rpmsg-io-channel { + #address-cells =3D <1>; + #size-cells =3D <0>; + + gpio@0 { + compatible =3D "rpmsg-gpio"; + reg =3D <0>; + gpio-controller; + #gpio-cells =3D <2>; + #interrupt-cells =3D <2>; + interrupt-controller; + }; + + gpio@1 { + compatible =3D "rpmsg-gpio"; + reg =3D <1>; + gpio-controller; + #gpio-cells =3D <2>; + #interrupt-cells =3D <2>; + interrupt-controller; + }; + }; + }; }; ... --=20 2.43.0 From nobody Tue Feb 10 23:53:28 2026 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11010029.outbound.protection.outlook.com [52.101.84.29]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 007A5374180; 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charset="utf-8" Describes the gpio rpmsg transport protocol over the rpmsg bus between the remote system and Linux. Signed-off-by: Shenwei Wang --- Documentation/driver-api/gpio/gpio-rpmsg.rst | 236 +++++++++++++++++++ Documentation/driver-api/gpio/index.rst | 1 + 2 files changed, 237 insertions(+) create mode 100644 Documentation/driver-api/gpio/gpio-rpmsg.rst diff --git a/Documentation/driver-api/gpio/gpio-rpmsg.rst b/Documentation/d= river-api/gpio/gpio-rpmsg.rst new file mode 100644 index 000000000000..6964de309471 --- /dev/null +++ b/Documentation/driver-api/gpio/gpio-rpmsg.rst @@ -0,0 +1,236 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +GPIO RPMSG Protocol +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +The GPIO RPMSG transport protocol is used for communication and interaction +with GPIO controllers located on remote cores on the RPMSG bus. + +Message Format +-------------- + +The RPMSG message consists of a 14-byte packet with the following layout: + +.. code-block:: none + + +-----+-------+--------+-----+-----+------------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | ID |vendor |version |type |cmd |reserved[5] |line |port | data | + +-----+-------+--------+-----+-----+------------+-----+-----+-----+----+ + +- **ID (Message Identification Code)**: Must be 0x5. Indicates the GPIO me= ssage. + +- **Vendor**: Vendor ID number. + - 0: Reserved + - 1: NXP + +- **Version**: Vendor-specific version number (such as software release). + +- **Type (Message Type)**: The message type can be one of: + + - 0: GPIO_RPMSG_SETUP + - 1: GPIO_RPMSG_REPLY + - 2: GPIO_RPMSG_NOTIFY + +- **Cmd**: Command code, used for GPIO_RPMSG_SETUP messages. + +- **reserved[5]**: Reserved bytes. Should always be 0. + +- **line**: The GPIO line(pin) index of the port. + +- **port**: The GPIO port(bank) index. + +- **data**: See details in the command description below. + +GPIO Commands +------------- + +Commands are specified in the **Cmd** field for **GPIO_RPMSG_SETUP** (Type= =3D0) messages. + +The SETUP message is always sent from Linux to the remote firmware. Each +SETUP corresponds to a single REPLY message. The GPIO driver should +serialize messages and determine whether a REPLY message is required. If a +REPLY message is expected but not received within the specified timeout +period (currently 1 second in the Linux driver), the driver should return +-ETIMEOUT. + +GPIO_RPMSG_INPUT_INIT (Cmd=3D0) +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +**Request:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 0 | 0 | 0 |line |port | val | wk | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +- **val**: Interrupt trigger type. + + - 0: Interrupt disabled + - 1: Rising edge trigger + - 2: Falling edge trigger + - 3: Both edge trigger + - 4: Low level trigger + - 5: High level trigger + +- **wk**: Wakeup enable. + + The remote system should always aim to stay in a power-efficient state by + shutting down or clock-gating the GPIO blocks that aren't in use. Since + the remoteproc driver is responsible for managing the power states of the + remote firmware, the GPIO driver does not require to know the firmware's + running states. + + When the wakeup bit is set, the remote firmware should configure the line + as a wakeup source. The firmware should send the notification message to + Linux after it is woken from the GPIO line. + + - 0: Disable wakeup from GPIO + - 1: Enable wakeup from GPIO + +**Reply:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 1 | 1 | 0 |line |port | err | 0 | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +- **err**: Error code from the remote core. + + - 0: Success + - 1: General error (Early remote software only returns this unclassified= error) + - 2: Not supported (A command is not supported by the remote firmware) + - 3: Resource not available (The resource is not allocated to Linux) + - 4: Resource busy (The resource is already in use) + - 5: Parameter error + +GPIO_RPMSG_OUTPUT_INIT (Cmd=3D1) +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +**Request:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 0 | 1 | 0 |line |port | val | 0 | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +- **val**: Output level. + + - 0: Low + - 1: High + +**Reply:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 1 | 1 | 0 |line |port | err | 0 | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +- **err**: See above for definitions. + +GPIO_RPMSG_INPUT_GET (Cmd=3D2) +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +**Request:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 0 | 2 | 0 |line |port | 0 | 0 | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +**Reply:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D | + | 5 | 1 | 0 | 1 | 2 | 0 |line |port | err |level| + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+ + +- **err**: See above for definitions. + +- **level**: Input level. + + - 0: Low + - 1: High + +GPIO_RPMSG_GET_DIRECTION (Cmd=3D3) +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +**Request:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 0 | 3 | 0 |line |port | 0 | 0 | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +**Reply:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D | + | 5 | 1 | 0 | 1 | 3 | 0 |line |port | err | dir | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+ + +- **err**: See above for definitions. + +- **dir**: Direction. + + - 0: Output + - 1: Input + +GPIO_RPMSG_NOTIFY_REPLY (Cmd=3D4) +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +The reply message for the notification is optional. The remote firmware can +implement it to simulate the interrupt acknowledgment behavior. + +**Request:** + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 0 | 4 | 0 |line |port |level| 0 | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +- **line**: The GPIO line(pin) index of the port. +- **port**: The GPIO port(bank) index. + +Notification Message +-------------------- + +Notifications are sent with **Type=3D2 (GPIO_RPMSG_NOTIFY)**: + +When a GPIO line asserts an interrupt on the remote processor, the firmware +should immediately mask the corresponding interrupt source and send a +notification message to the Linux. Upon completion of the interrupt +handling on the Linux side, the driver should issue a +**GPIO_RPMSG_INPUT_INIT** command to the firmware to unmask the interrupt. + +A Notification message can arrive between a SETUP and its REPLY message, +and the driver is expected to handle this scenario. + +.. code-block:: none + + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D| + | 5 | 1 | 0 | 2 | 0 | 0 |line |port |type | 0 | + +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+ + +- **line**: The GPIO line(pin) index of the port. +- **port**: The GPIO port(bank) index. +- **type**: Optional pamameter to indicate the trigger event type. + diff --git a/Documentation/driver-api/gpio/index.rst b/Documentation/driver= -api/gpio/index.rst index bee58f709b9a..e5eb1f82f01f 100644 --- a/Documentation/driver-api/gpio/index.rst +++ b/Documentation/driver-api/gpio/index.rst @@ -16,6 +16,7 @@ Contents: drivers-on-gpio bt8xxgpio pca953x + gpio-rpmsg =20 Core =3D=3D=3D=3D --=20 2.43.0 From nobody Tue Feb 10 23:53:28 2026 Received: from PA4PR04CU001.outbound.protection.outlook.com (mail-francecentralazon11013010.outbound.protection.outlook.com [40.107.162.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC4BC32ABF6; 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charset="utf-8" On an AMP platform, the system may include two processors: - An MCU running an RTOS - An MPU running Linux These processors communicate via the RPMSG protocol. The driver implements the standard GPIO interface, allowing the Linux side to control GPIO controllers which reside in the remote processor via RPMSG protocol. Cc: Bartosz Golaszewski Cc: Andrew Lunn Signed-off-by: Shenwei Wang --- drivers/gpio/Kconfig | 16 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-rpmsg.c | 583 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 600 insertions(+) create mode 100644 drivers/gpio/gpio-rpmsg.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index bd185482a7fd..00ea0c1d8035 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1883,6 +1883,22 @@ config GPIO_SODAVILLE =20 endmenu =20 +menu "RPMSG GPIO drivers" + depends on RPMSG + +config GPIO_RPMSG + tristate "Generic RPMSG GPIO support" + select GPIOLIB_IRQCHIP + default REMOTEPROC + help + Say yes here to support the generic GPIO functions over the RPMSG + bus. Currently supported devices: i.MX7ULP, i.MX8ULP, i.MX8x, and + i.MX9x. + + If unsure, say N. + +endmenu + menu "SPI GPIO expanders" depends on SPI_MASTER =20 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 2421a8fd3733..b1373ec274c8 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -156,6 +156,7 @@ obj-$(CONFIG_GPIO_RDC321X) +=3D gpio-rdc321x.o obj-$(CONFIG_GPIO_REALTEK_OTTO) +=3D gpio-realtek-otto.o obj-$(CONFIG_GPIO_REG) +=3D gpio-reg.o obj-$(CONFIG_GPIO_ROCKCHIP) +=3D gpio-rockchip.o +obj-$(CONFIG_GPIO_RPMSG) +=3D gpio-rpmsg.o obj-$(CONFIG_GPIO_RTD) +=3D gpio-rtd.o obj-$(CONFIG_ARCH_SA1100) +=3D gpio-sa1100.o obj-$(CONFIG_GPIO_SAMA5D2_PIOBU) +=3D gpio-sama5d2-piobu.o diff --git a/drivers/gpio/gpio-rpmsg.c b/drivers/gpio/gpio-rpmsg.c new file mode 100644 index 000000000000..8c235d9dc336 --- /dev/null +++ b/drivers/gpio/gpio-rpmsg.c @@ -0,0 +1,583 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2026 NXP + * + * The driver exports a standard gpiochip interface to control + * the GPIO controllers via RPMSG on a remote processor. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RPMSG_GPIO_ID 5 +#define RPMSG_VENDOR 1 +#define RPMSG_VERSION 0 + +#define GPIOS_PER_PORT 32 +#define RPMSG_TIMEOUT 1000 + +/* GPIO RPMSG header type */ +#define GPIO_RPMSG_SETUP 0 +#define GPIO_RPMSG_REPLY 1 +#define GPIO_RPMSG_NOTIFY 2 + +/* GPIO Interrupt trigger type */ +#define GPIO_RPMSG_TRI_IGNORE 0 +#define GPIO_RPMSG_TRI_RISING 1 +#define GPIO_RPMSG_TRI_FALLING 2 +#define GPIO_RPMSG_TRI_BOTH_EDGE 3 +#define GPIO_RPMSG_TRI_LOW_LEVEL 4 +#define GPIO_RPMSG_TRI_HIGH_LEVEL 5 + +/* GPIO RPMSG commands */ +#define GPIO_RPMSG_INPUT_INIT 0 +#define GPIO_RPMSG_OUTPUT_INIT 1 +#define GPIO_RPMSG_INPUT_GET 2 +#define GPIO_RPMSG_DIRECTION_GET 3 + +#define MAX_PORT_PER_CHANNEL 10 + +/* + * @rproc_name: the name of the remote proc. + * @channel_devices: an array of the devices related to the rpdev. + */ +struct rpdev_drvdata { + const char *rproc_name; + void *channel_devices[MAX_PORT_PER_CHANNEL]; +}; + +struct gpio_rpmsg_head { + u8 id; /* Message ID Code */ + u8 vendor; /* Vendor ID number */ + u8 version; /* Vendor-specific version number */ + u8 type; /* Message type */ + u8 cmd; /* Command code */ + u8 reserved[5]; +} __packed; + +struct gpio_rpmsg_packet { + struct gpio_rpmsg_head header; + u8 pin_idx; + u8 port_idx; + union { + u8 event; + u8 retcode; + u8 value; + } out; + union { + u8 wakeup; + u8 value; + } in; +} __packed __aligned(8); + +struct gpio_rpmsg_pin { + u8 irq_shutdown; + u8 irq_unmask; + u8 irq_mask; + u32 irq_wake_enable; + u32 irq_type; + struct gpio_rpmsg_packet msg; +}; + +struct gpio_rpmsg_info { + struct rpmsg_device *rpdev; + struct gpio_rpmsg_packet *reply_msg; + struct completion cmd_complete; + struct mutex lock; + void **port_store; +}; + +struct rpmsg_gpio_port { + struct gpio_chip gc; + struct gpio_rpmsg_pin gpio_pins[GPIOS_PER_PORT]; + struct gpio_rpmsg_info info; + int idx; +}; + +static int gpio_send_message(struct rpmsg_gpio_port *port, + struct gpio_rpmsg_packet *msg, + bool sync) +{ + struct gpio_rpmsg_info *info =3D &port->info; + int err; + + reinit_completion(&info->cmd_complete); + err =3D rpmsg_send(info->rpdev->ept, msg, sizeof(struct gpio_rpmsg_packet= )); + if (err) { + dev_err(&info->rpdev->dev, "rpmsg_send failed: %d\n", err); + return err; + } + + if (sync) { + err =3D wait_for_completion_timeout(&info->cmd_complete, + msecs_to_jiffies(RPMSG_TIMEOUT)); + if (!err) { + dev_err(&info->rpdev->dev, "rpmsg_send timeout!\n"); + return -ETIMEDOUT; + } + + if (info->reply_msg->out.retcode !=3D 0) { + dev_err(&info->rpdev->dev, "remote core replies an error: %d!\n", + info->reply_msg->out.retcode); + return -EINVAL; + } + + /* copy the reply message */ + memcpy(&port->gpio_pins[info->reply_msg->pin_idx].msg, + info->reply_msg, sizeof(*info->reply_msg)); + } + + return 0; +} + +static struct gpio_rpmsg_packet *gpio_setup_msg_header(struct rpmsg_gpio_p= ort *port, + unsigned int offset, + u8 cmd) +{ + struct gpio_rpmsg_packet *msg =3D &port->gpio_pins[offset].msg; + + memset(msg, 0, sizeof(struct gpio_rpmsg_packet)); + msg->header.id =3D RPMSG_GPIO_ID; + msg->header.vendor =3D RPMSG_VENDOR; + msg->header.version =3D RPMSG_VERSION; + msg->header.type =3D GPIO_RPMSG_SETUP; + msg->header.cmd =3D cmd; + msg->pin_idx =3D offset; + msg->port_idx =3D port->idx; + + return msg; +} + +static int rpmsg_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct rpmsg_gpio_port *port =3D gpiochip_get_data(gc); + struct gpio_rpmsg_packet *msg; + int ret; + + guard(mutex)(&port->info.lock); + + msg =3D gpio_setup_msg_header(port, gpio, GPIO_RPMSG_INPUT_GET); + + ret =3D gpio_send_message(port, msg, true); + if (!ret) + ret =3D !!port->gpio_pins[gpio].msg.in.value; + + return ret; +} + +static int rpmsg_gpio_get_direction(struct gpio_chip *gc, unsigned int gpi= o) +{ + struct rpmsg_gpio_port *port =3D gpiochip_get_data(gc); + struct gpio_rpmsg_packet *msg; + int ret; + + guard(mutex)(&port->info.lock); + + msg =3D gpio_setup_msg_header(port, gpio, GPIO_RPMSG_DIRECTION_GET); + + ret =3D gpio_send_message(port, msg, true); + if (!ret) + ret =3D !!port->gpio_pins[gpio].msg.in.value; + + return ret; +} + +static int rpmsg_gpio_direction_input(struct gpio_chip *gc, unsigned int g= pio) +{ + struct rpmsg_gpio_port *port =3D gpiochip_get_data(gc); + struct gpio_rpmsg_packet *msg; + + guard(mutex)(&port->info.lock); + + msg =3D gpio_setup_msg_header(port, gpio, GPIO_RPMSG_INPUT_INIT); + + return gpio_send_message(port, msg, true); +} + +static int rpmsg_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct rpmsg_gpio_port *port =3D gpiochip_get_data(gc); + struct gpio_rpmsg_packet *msg; + + guard(mutex)(&port->info.lock); + + msg =3D gpio_setup_msg_header(port, gpio, GPIO_RPMSG_OUTPUT_INIT); + msg->out.value =3D val; + + return gpio_send_message(port, msg, true); +} + +static int rpmsg_gpio_direction_output(struct gpio_chip *gc, + unsigned int gpio, + int val) +{ + return rpmsg_gpio_set(gc, gpio, val); +} + +static int gpio_rpmsg_irq_set_type(struct irq_data *d, u32 type) +{ + struct rpmsg_gpio_port *port =3D irq_data_get_irq_chip_data(d); + u32 gpio_idx =3D d->hwirq; + int edge =3D 0; + int ret =3D 0; + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + edge =3D GPIO_RPMSG_TRI_RISING; + irq_set_handler_locked(d, handle_simple_irq); + break; + case IRQ_TYPE_EDGE_FALLING: + edge =3D GPIO_RPMSG_TRI_FALLING; + irq_set_handler_locked(d, handle_simple_irq); + break; + case IRQ_TYPE_EDGE_BOTH: + edge =3D GPIO_RPMSG_TRI_BOTH_EDGE; + irq_set_handler_locked(d, handle_simple_irq); + break; + case IRQ_TYPE_LEVEL_LOW: + edge =3D GPIO_RPMSG_TRI_LOW_LEVEL; + irq_set_handler_locked(d, handle_level_irq); + break; + case IRQ_TYPE_LEVEL_HIGH: + edge =3D GPIO_RPMSG_TRI_HIGH_LEVEL; + irq_set_handler_locked(d, handle_level_irq); + break; + default: + ret =3D -EINVAL; + irq_set_handler_locked(d, handle_bad_irq); + break; + } + + port->gpio_pins[gpio_idx].irq_type =3D edge; + + return ret; +} + +static int gpio_rpmsg_irq_set_wake(struct irq_data *d, u32 enable) +{ + struct rpmsg_gpio_port *port =3D irq_data_get_irq_chip_data(d); + u32 gpio_idx =3D d->hwirq; + + port->gpio_pins[gpio_idx].irq_wake_enable =3D enable; + + return 0; +} + +/* + * This unmask/mask function is invoked in two situations: + * - when an interrupt is being set up, and + * - after an interrupt has occurred. + * + * The GPIO driver does not access hardware registers directly. + * Instead, it caches all relevant information locally, and then sends + * the accumulated state to the remote system at this stage. + */ +static void gpio_rpmsg_unmask_irq(struct irq_data *d) +{ + struct rpmsg_gpio_port *port =3D irq_data_get_irq_chip_data(d); + u32 gpio_idx =3D d->hwirq; + + port->gpio_pins[gpio_idx].irq_unmask =3D 1; +} + +static void gpio_rpmsg_mask_irq(struct irq_data *d) +{ + struct rpmsg_gpio_port *port =3D irq_data_get_irq_chip_data(d); + u32 gpio_idx =3D d->hwirq; + + /* + * When an interrupt occurs, the remote system masks the interrupt + * and then sends a notification to Linux. After Linux processes + * that notification, it sends an RPMsg command back to the remote + * system to unmask the interrupt again. + */ + port->gpio_pins[gpio_idx].irq_mask =3D 1; +} + +static void gpio_rpmsg_irq_shutdown(struct irq_data *d) +{ + struct rpmsg_gpio_port *port =3D irq_data_get_irq_chip_data(d); + u32 gpio_idx =3D d->hwirq; + + port->gpio_pins[gpio_idx].irq_shutdown =3D 1; +} + +static void gpio_rpmsg_irq_bus_lock(struct irq_data *d) +{ + struct rpmsg_gpio_port *port =3D irq_data_get_irq_chip_data(d); + + mutex_lock(&port->info.lock); +} + +static void gpio_rpmsg_irq_bus_sync_unlock(struct irq_data *d) +{ + struct rpmsg_gpio_port *port =3D irq_data_get_irq_chip_data(d); + struct gpio_rpmsg_packet *msg =3D NULL; + u32 gpio_idx =3D d->hwirq; + + /* + * For mask irq, do nothing here. + * The remote system will mask interrupt after an interrupt occurs, + * and then send a notify to Linux system. + * After Linux system dealt with the notify, it will send an rpmsg to + * the remote system to unmask this interrupt again. + */ + if (port->gpio_pins[gpio_idx].irq_mask && !port->gpio_pins[gpio_idx].irq_= unmask) { + port->gpio_pins[gpio_idx].irq_mask =3D 0; + mutex_unlock(&port->info.lock); + return; + } + + msg =3D gpio_setup_msg_header(port, gpio_idx, GPIO_RPMSG_INPUT_INIT); + + if (port->gpio_pins[gpio_idx].irq_shutdown) { + msg->out.event =3D GPIO_RPMSG_TRI_IGNORE; + msg->in.wakeup =3D 0; + port->gpio_pins[gpio_idx].irq_shutdown =3D 0; + } else { + /* if not set irq type, then use low level as trigger type */ + msg->out.event =3D port->gpio_pins[gpio_idx].irq_type; + if (!msg->out.event) + msg->out.event =3D GPIO_RPMSG_TRI_LOW_LEVEL; + if (port->gpio_pins[gpio_idx].irq_unmask) { + msg->in.wakeup =3D 0; + port->gpio_pins[gpio_idx].irq_unmask =3D 0; + } else /* irq set wake */ + msg->in.wakeup =3D port->gpio_pins[gpio_idx].irq_wake_enable; + } + + gpio_send_message(port, msg, false); + mutex_unlock(&port->info.lock); +} + +static const struct irq_chip gpio_rpmsg_irq_chip =3D { + .irq_mask =3D gpio_rpmsg_mask_irq, + .irq_unmask =3D gpio_rpmsg_unmask_irq, + .irq_set_wake =3D gpio_rpmsg_irq_set_wake, + .irq_set_type =3D gpio_rpmsg_irq_set_type, + .irq_shutdown =3D gpio_rpmsg_irq_shutdown, + .irq_bus_lock =3D gpio_rpmsg_irq_bus_lock, + .irq_bus_sync_unlock =3D gpio_rpmsg_irq_bus_sync_unlock, + .flags =3D IRQCHIP_IMMUTABLE, +}; + +static void rpmsg_gpio_remove_action(void *data) +{ + struct rpmsg_gpio_port *port =3D data; + + port->info.port_store[port->idx] =3D NULL; +} + +static int rpmsg_gpiochip_register(struct rpmsg_device *rpdev, struct devi= ce_node *np) +{ + struct rpdev_drvdata *drvdata =3D dev_get_drvdata(&rpdev->dev); + struct rpmsg_gpio_port *port; + struct gpio_irq_chip *girq; + struct gpio_chip *gc; + int ret; + + port =3D devm_kzalloc(&rpdev->dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + ret =3D of_property_read_u32(np, "reg", &port->idx); + if (ret) + return ret; + + if (port->idx >=3D MAX_PORT_PER_CHANNEL) + return -EINVAL; + + ret =3D devm_mutex_init(&rpdev->dev, &port->info.lock); + if (ret) + return ret; + + init_completion(&port->info.cmd_complete); + port->info.reply_msg =3D devm_kzalloc(&rpdev->dev, + sizeof(struct gpio_rpmsg_packet), + GFP_KERNEL); + port->info.port_store =3D drvdata->channel_devices; + port->info.port_store[port->idx] =3D port; + port->info.rpdev =3D rpdev; + + gc =3D &port->gc; + gc->owner =3D THIS_MODULE; + gc->parent =3D &rpdev->dev; + gc->fwnode =3D of_fwnode_handle(np); + gc->ngpio =3D GPIOS_PER_PORT; + gc->base =3D -1; + gc->label =3D devm_kasprintf(&rpdev->dev, GFP_KERNEL, "%s-gpio%d", + drvdata->rproc_name, port->idx); + + gc->direction_input =3D rpmsg_gpio_direction_input; + gc->direction_output =3D rpmsg_gpio_direction_output; + gc->get_direction =3D rpmsg_gpio_get_direction; + gc->get =3D rpmsg_gpio_get; + gc->set =3D rpmsg_gpio_set; + + girq =3D &gc->irq; + gpio_irq_chip_set_chip(girq, &gpio_rpmsg_irq_chip); + girq->parent_handler =3D NULL; + girq->num_parents =3D 0; + girq->parents =3D NULL; + girq->chip->name =3D devm_kasprintf(&rpdev->dev, GFP_KERNEL, "%s-gpio%d", + drvdata->rproc_name, port->idx); + + ret =3D devm_add_action_or_reset(&rpdev->dev, rpmsg_gpio_remove_action, p= ort); + if (ret) + return ret; + + return devm_gpiochip_add_data(&rpdev->dev, gc, port); +} + +static const char *rpmsg_get_rproc_node_name(struct rpmsg_device *rpdev) +{ + const char *name =3D NULL; + struct device_node *np; + struct rproc *rproc; + + rproc =3D rproc_get_by_child(&rpdev->dev); + + if (!rproc) + return NULL; + + np =3D of_node_get(rproc->dev.of_node); + if (!np && rproc->dev.parent) + np =3D of_node_get(rproc->dev.parent->of_node); + + if (np) { + name =3D devm_kstrdup(&rpdev->dev, np->name, GFP_KERNEL); + of_node_put(np); + } + + return name; +} + +static struct device_node * +rpmsg_get_channel_ofnode(struct rpmsg_device *rpdev, char *chan_name) +{ + struct device_node *np_chan =3D NULL, *np; + struct rproc *rproc; + + rproc =3D rproc_get_by_child(&rpdev->dev); + if (!rproc) + return NULL; + + np =3D of_node_get(rproc->dev.of_node); + if (!np && rproc->dev.parent) + np =3D of_node_get(rproc->dev.parent->of_node); + + if (np) { + /* Balance the of_node_put() performed by of_find_node_by_name(). */ + of_node_get(np); + np_chan =3D of_find_node_by_name(np, chan_name); + of_node_put(np); + } + + return np_chan; +} + +static int +rpmsg_gpio_channel_callback(struct rpmsg_device *rpdev, void *data, + int len, void *priv, u32 src) +{ + struct gpio_rpmsg_packet *msg =3D data; + struct rpmsg_gpio_port *port =3D NULL; + struct rpdev_drvdata *drvdata; + + drvdata =3D dev_get_drvdata(&rpdev->dev); + if (drvdata && msg && (msg->port_idx < MAX_PORT_PER_CHANNEL)) + port =3D drvdata->channel_devices[msg->port_idx]; + + if (!port) + return -ENODEV; + + if (msg->header.type =3D=3D GPIO_RPMSG_REPLY) { + *port->info.reply_msg =3D *msg; + complete(&port->info.cmd_complete); + } else if (msg->header.type =3D=3D GPIO_RPMSG_NOTIFY) { + generic_handle_domain_irq_safe(port->gc.irq.domain, msg->pin_idx); + } else + dev_err(&rpdev->dev, "wrong command type!\n"); + + return 0; +} + +static int rpmsg_gpio_channel_probe(struct rpmsg_device *rpdev) +{ + struct device *dev =3D &rpdev->dev; + struct rpdev_drvdata *drvdata; + struct device_node *np; + int ret; + + if (!dev->of_node) { + np =3D rpmsg_get_channel_ofnode(rpdev, rpdev->id.name); + if (np) { + dev->of_node =3D np; + set_primary_fwnode(dev, of_fwnode_handle(np)); + } + return -EPROBE_DEFER; + } + + drvdata =3D devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->rproc_name =3D rpmsg_get_rproc_node_name(rpdev); + dev_set_drvdata(dev, drvdata); + + for_each_child_of_node_scoped(dev->of_node, child) { + if (!of_device_is_available(child)) + continue; + + if (!of_match_node(dev->driver->of_match_table, child)) + continue; + + ret =3D rpmsg_gpiochip_register(rpdev, child); + if (ret < 0) + dev_err(dev, "Failed to register: %pOF\n", child); + } + + return 0; +} + +static void rpmsg_gpio_channel_remove(struct rpmsg_device *rpdev) +{ + dev_info(&rpdev->dev, "rpmsg gpio channel driver is removed\n"); +} + +static const struct of_device_id rpmsg_gpio_dt_ids[] =3D { + { .compatible =3D "rpmsg-gpio" }, + { /* sentinel */ } +}; + +static struct rpmsg_device_id rpmsg_gpio_channel_id_table[] =3D { + { .name =3D "rpmsg-io-channel" }, + { }, +}; +MODULE_DEVICE_TABLE(rpmsg, rpmsg_gpio_channel_id_table); + +static struct rpmsg_driver rpmsg_gpio_channel_client =3D { + .drv.name =3D KBUILD_MODNAME, + .drv.of_match_table =3D rpmsg_gpio_dt_ids, + .id_table =3D rpmsg_gpio_channel_id_table, + .probe =3D rpmsg_gpio_channel_probe, + .callback =3D rpmsg_gpio_channel_callback, + .remove =3D rpmsg_gpio_channel_remove, +}; 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charset="utf-8" Add the RPMSG bus node along with its GPIO subnodes to the device tree. Enable remote device communication and GPIO control via RPMSG on the i.MX platform. Signed-off-by: Shenwei Wang --- arch/arm64/boot/dts/freescale/imx8ulp.dtsi | 27 ++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi b/arch/arm64/boot/d= ts/freescale/imx8ulp.dtsi index 13b01f3aa2a4..93846435c6c1 100644 --- a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi @@ -191,6 +191,33 @@ scmi_sensor: protocol@15 { cm33: remoteproc-cm33 { compatible =3D "fsl,imx8ulp-cm33"; status =3D "disabled"; + + rpmsg { + rpmsg-io-channel { + #address-cells =3D <1>; + #size-cells =3D <0>; + + rpmsg_gpioa: gpio@0 { + compatible =3D "rpmsg-gpio"; + reg =3D <0>; + gpio-controller; + #gpio-cells =3D <2>; + #interrupt-cells =3D <2>; + interrupt-controller; + interrupt-parent =3D <&rpmsg_gpioa>; + }; + + rpmsg_gpiob: gpio@1 { + compatible =3D "rpmsg-gpio"; + reg =3D <1>; + gpio-controller; + #gpio-cells =3D <2>; + #interrupt-cells =3D <2>; + interrupt-controller; + interrupt-parent =3D <&rpmsg_gpiob>; + }; + }; + }; }; =20 soc: soc@0 { --=20 2.43.0