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The devices on the mux can be selected by writing the appropriate device number to an I2C config register. Reviewed-by: Rob Herring (Arm) Acked-by: Wolfram Sang Signed-off-by: Farouk Bouabid --- .../devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml | 69 ++++++++++++++++++= ++++ 1 file changed, 69 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml b/= Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml new file mode 100644 index 000000000000..28139b676661 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml @@ -0,0 +1,69 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/tsd,mule-i2c-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Theobroma Systems Mule I2C multiplexer + +maintainers: + - Farouk Bouabid + - Quentin Schulz + +description: | + Theobroma Systems Mule is an MCU that emulates a set of I2C devices, amo= ng + which devices that are reachable through an I2C-mux. The devices on the = mux + can be selected by writing the appropriate device number to an I2C config + register. + + + +--------------------------------------------------+ + | Mule | + 0x18| +---------------+ | + -------->|Config register|----+ | + | +---------------+ | | + | V_ | + | | \ +--------+ | + | | \-------->| dev #0 | | + | | | +--------+ | + 0x6f| | M |-------->| dev #1 | | + ---------------------------->| U | +--------+ | + | | X |-------->| dev #2 | | + | | | +--------+ | + | | /-------->| dev #3 | | + | |__/ +--------+ | + +--------------------------------------------------+ + + +allOf: + - $ref: /schemas/i2c/i2c-mux.yaml# + +properties: + compatible: + const: tsd,mule-i2c-mux + +required: + - compatible + +unevaluatedProperties: false + +examples: + - | + i2c-mux { + compatible =3D "tsd,mule-i2c-mux"; + #address-cells =3D <1>; + #size-cells =3D <0>; + + i2c@0 { + reg =3D <0x0>; + #address-cells =3D <1>; + #size-cells =3D <0>; + + rtc@6f { + compatible =3D "isil,isl1208"; 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The devices on the mux can be selected by writing the appropriate device number to an I2C config register (amc6821 reg 0xff). This driver is expected to be probed as a platform device with amc6821 as its parent i2c device. Add support for the mule-i2c-mux platform driver. The amc6821 driver support for the mux will be added in a later commit. Reviewed-by: Wolfram Sang Signed-off-by: Farouk Bouabid --- drivers/i2c/muxes/Kconfig | 16 +++++ drivers/i2c/muxes/Makefile | 1 + drivers/i2c/muxes/i2c-mux-mule.c | 148 +++++++++++++++++++++++++++++++++++= ++++ 3 files changed, 165 insertions(+) diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index db1b9057612a..6d2f66810cdc 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -119,4 +119,20 @@ config I2C_MUX_MLXCPLD This driver can also be built as a module. If so, the module will be called i2c-mux-mlxcpld. =20 +config I2C_MUX_MULE + tristate "Theobroma Systems Mule I2C device multiplexer" + depends on OF && SENSORS_AMC6821 + help + Mule is an MCU that emulates a set of I2C devices, among which + devices that are reachable through an I2C-mux. The devices on the mux + can be selected by writing the appropriate device number to an I2C + configuration register. + + If you say yes to this option, support will be included for a + Theobroma Systems Mule I2C multiplexer. This driver provides access to + I2C devices connected on this mux. + + This driver can also be built as a module. If so, the module + will be called i2c-mux-mule. + endmenu diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile index 6d9d865e8518..4b24f49515a7 100644 --- a/drivers/i2c/muxes/Makefile +++ b/drivers/i2c/muxes/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_I2C_MUX_GPIO) +=3D i2c-mux-gpio.o obj-$(CONFIG_I2C_MUX_GPMUX) +=3D i2c-mux-gpmux.o obj-$(CONFIG_I2C_MUX_LTC4306) +=3D i2c-mux-ltc4306.o obj-$(CONFIG_I2C_MUX_MLXCPLD) +=3D i2c-mux-mlxcpld.o +obj-$(CONFIG_I2C_MUX_MULE) +=3D i2c-mux-mule.o obj-$(CONFIG_I2C_MUX_PCA9541) +=3D i2c-mux-pca9541.o obj-$(CONFIG_I2C_MUX_PCA954x) +=3D i2c-mux-pca954x.o obj-$(CONFIG_I2C_MUX_PINCTRL) +=3D i2c-mux-pinctrl.o diff --git a/drivers/i2c/muxes/i2c-mux-mule.c b/drivers/i2c/muxes/i2c-mux-m= ule.c new file mode 100644 index 000000000000..e4e8992d4a09 --- /dev/null +++ b/drivers/i2c/muxes/i2c-mux-mule.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Theobroma Systems Mule I2C device multiplexer + * + * Copyright (C) 2024 Theobroma Systems Design und Consulting GmbH + */ + +#include +#include +#include +#include +#include +#include +#include + +#define MUX_CONFIG_REG 0xff +#define MUX_DEFAULT_DEV 0x0 + +struct mule_i2c_reg_mux { + struct regmap *regmap; +}; + +static int mux_select(struct i2c_mux_core *muxc, u32 dev) +{ + struct mule_i2c_reg_mux *mux =3D muxc->priv; + + return regmap_write(mux->regmap, MUX_CONFIG_REG, dev); +} + +static int mux_deselect(struct i2c_mux_core *muxc, u32 dev) +{ + return mux_select(muxc, MUX_DEFAULT_DEV); +} + +static void mux_remove(void *data) +{ + struct i2c_mux_core *muxc =3D data; + + i2c_mux_del_adapters(muxc); + + mux_deselect(muxc, MUX_DEFAULT_DEV); +} + +static int mule_i2c_mux_probe(struct platform_device *pdev) +{ + struct device *mux_dev =3D &pdev->dev; + struct mule_i2c_reg_mux *priv; + struct i2c_client *client; + struct i2c_mux_core *muxc; + struct device_node *dev; + unsigned int readback; + int ndev, ret; + bool old_fw; + + /* Count devices on the mux */ + ndev =3D of_get_child_count(mux_dev->of_node); + dev_dbg(mux_dev, "%d devices on the mux\n", ndev); + + client =3D to_i2c_client(mux_dev->parent); + + muxc =3D i2c_mux_alloc(client->adapter, mux_dev, ndev, sizeof(*priv), + I2C_MUX_LOCKED, mux_select, mux_deselect); + if (!muxc) + return -ENOMEM; + + priv =3D i2c_mux_priv(muxc); + + priv->regmap =3D dev_get_regmap(mux_dev->parent, NULL); + if (IS_ERR(priv->regmap)) + return dev_err_probe(mux_dev, PTR_ERR(priv->regmap), + "No parent i2c register map\n"); + + platform_set_drvdata(pdev, muxc); + + /* + * MUX_DEFAULT_DEV is guaranteed to exist on all old and new mule fw. + * mule fw without mux support will accept write ops to the + * config register, but readback returns 0xff (register not updated). + */ + ret =3D mux_select(muxc, MUX_DEFAULT_DEV); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to write config register\n"); + + ret =3D regmap_read(priv->regmap, MUX_CONFIG_REG, &readback); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to read config register\n"); + + old_fw =3D (readback !=3D MUX_DEFAULT_DEV); + + ret =3D devm_add_action_or_reset(mux_dev, mux_remove, muxc); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to register mux remove\n"); + + /* Create device adapters */ + for_each_child_of_node(mux_dev->of_node, dev) { + u32 reg; + + ret =3D of_property_read_u32(dev, "reg", ®); + if (ret) + return dev_err_probe(mux_dev, ret, + "No reg property found for %s\n", + of_node_full_name(dev)); + + if (old_fw && reg !=3D 0) { + dev_warn(mux_dev, + "Mux is not supported, please update Mule FW\n"); + continue; + } + + ret =3D mux_select(muxc, reg); + if (ret) { + dev_warn(mux_dev, + "Device %d not supported, please update Mule FW\n", reg); + continue; + } + + ret =3D i2c_mux_add_adapter(muxc, 0, reg); + if (ret) + return ret; + } + + mux_deselect(muxc, MUX_DEFAULT_DEV); + + return 0; +} + +static const struct of_device_id mule_i2c_mux_of_match[] =3D { + {.compatible =3D "tsd,mule-i2c-mux",}, + {}, +}; +MODULE_DEVICE_TABLE(of, mule_i2c_mux_of_match); + +static struct platform_driver mule_i2c_mux_driver =3D { + .driver =3D { + .name =3D "mule-i2c-mux", + .of_match_table =3D mule_i2c_mux_of_match, + }, + .probe =3D mule_i2c_mux_probe, +}; + +module_platform_driver(mule_i2c_mux_driver); + +MODULE_AUTHOR("Farouk Bouabid "); +MODULE_DESCRIPTION("I2C mux driver for Theobroma Systems Mule"); 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Reviewed-by: Rob Herring (Arm) Signed-off-by: Farouk Bouabid --- Notes: Merge after patch 1 .../devicetree/bindings/hwmon/ti,amc6821.yaml | 86 ++++++++++++++++++= ++++ .../devicetree/bindings/trivial-devices.yaml | 2 - 2 files changed, 86 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/hwmon/ti,amc6821.yaml b/Docu= mentation/devicetree/bindings/hwmon/ti,amc6821.yaml new file mode 100644 index 000000000000..5d33f1a23d03 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/ti,amc6821.yaml @@ -0,0 +1,86 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/ti,amc6821.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: AMC6821 Intelligent Temperature Monitor and PWM Fan Controller + +maintainers: + - Farouk Bouabid + - Quentin Schulz + +description: + Intelligent temperature monitor and pulse-width modulation (PWM) fan + controller. + +properties: + compatible: + oneOf: + - items: + - const: tsd,mule + - const: ti,amc6821 + - const: ti,amc6821 + + reg: + maxItems: 1 + + i2c-mux: + type: object + +required: + - compatible + - reg + +if: + properties: + compatible: + contains: + const: tsd,mule + +then: + required: + - i2c-mux + +additionalProperties: false + +examples: + - | + i2c { + #address-cells =3D <1>; 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The devices on the mux can be selected by writing the appropriate device number to an I2C config register (amc6821: reg 0xff) Implement "tsd,mule" compatible to instantiate the I2C-mux platform device when probing the amc6821. Reviewed-by: Guenter Roeck Signed-off-by: Farouk Bouabid --- drivers/hwmon/amc6821.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c index ec94392fcb65..a3fdbcf01ecd 100644 --- a/drivers/hwmon/amc6821.c +++ b/drivers/hwmon/amc6821.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include =20 @@ -897,7 +898,6 @@ static bool amc6821_volatile_reg(struct device *dev, un= signed int reg) static const struct regmap_config amc6821_regmap_config =3D { .reg_bits =3D 8, .val_bits =3D 8, - .max_register =3D AMC6821_REG_CONF3, .volatile_reg =3D amc6821_volatile_reg, .cache_type =3D REGCACHE_MAPLE, }; @@ -924,6 +924,13 @@ static int amc6821_probe(struct i2c_client *client) if (err) return err; =20 + if (of_device_is_compatible(dev->of_node, "tsd,mule")) { + err =3D devm_of_platform_populate(dev); + if (err) + return dev_err_probe(dev, err, + "Failed to create sub-devices\n"); + } + hwmon_dev =3D devm_hwmon_device_register_with_info(dev, client->name, data, &amc6821_chip_info, amc6821_groups); 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Mon, 2 Sep 2024 16:38:37 +0000 From: Farouk Bouabid Date: Mon, 02 Sep 2024 18:38:18 +0200 Subject: [PATCH v7 5/8] arm64: dts: rockchip: add tsd,mule-i2c-mux on rk3588-jaguar Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240902-dev-mule-i2c-mux-v7-5-bf7b8f5385ed@cherry.de> References: <20240902-dev-mule-i2c-mux-v7-0-bf7b8f5385ed@cherry.de> In-Reply-To: <20240902-dev-mule-i2c-mux-v7-0-bf7b8f5385ed@cherry.de> To: Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Farouk Bouabid , Quentin Schulz , Peter Rosin , Jean Delvare , Guenter Roeck , Heiko Stuebner Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org X-Mailer: b4 0.15-dev-99b12 X-ClientProxiedBy: VI1PR0502CA0001.eurprd05.prod.outlook.com (2603:10a6:803:1::14) To DU0PR04MB9562.eurprd04.prod.outlook.com (2603:10a6:10:321::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU0PR04MB9562:EE_|DB9PR04MB9645:EE_ X-MS-Office365-Filtering-Correlation-Id: 6a88b850-c54e-4e3f-f59e-08dccb6db19f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|52116014|7416014|376014|38350700014|921020; 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Signed-off-by: Farouk Bouabid --- Notes: Merge after patches 1,2,3,4 arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts | 25 +++++++++++++++++++---= --- 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts b/arch/arm64/bo= ot/dts/rockchip/rk3588-jaguar.dts index 31d2f8994f85..56f87a603581 100644 --- a/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts +++ b/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts @@ -32,6 +32,7 @@ button-bios-disable { =20 aliases { ethernet0 =3D &gmac0; + i2c10 =3D &i2c10; mmc0 =3D &sdhci; mmc1 =3D &sdmmc; rtc0 =3D &rtc_twi; @@ -276,8 +277,25 @@ &i2c0 { status =3D "okay"; =20 fan@18 { - compatible =3D "ti,amc6821"; + compatible =3D "tsd,mule", "ti,amc6821"; reg =3D <0x18>; + + i2c-mux { + compatible =3D "tsd,mule-i2c-mux"; + #address-cells =3D <1>; + #size-cells =3D <0>; + + i2c10: i2c@0 { + reg =3D <0x0>; + #address-cells =3D <1>; + #size-cells =3D <0>; + + rtc_twi: rtc@6f { + compatible =3D "isil,isl1208"; + reg =3D <0x6f>; 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Mon, 2 Sep 2024 16:38:38 +0000 From: Farouk Bouabid Date: Mon, 02 Sep 2024 18:38:19 +0200 Subject: [PATCH v7 6/8] arm64: dts: rockchip: add tsd,mule-i2c-mux on rk3399-puma Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240902-dev-mule-i2c-mux-v7-6-bf7b8f5385ed@cherry.de> References: <20240902-dev-mule-i2c-mux-v7-0-bf7b8f5385ed@cherry.de> In-Reply-To: <20240902-dev-mule-i2c-mux-v7-0-bf7b8f5385ed@cherry.de> To: Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Farouk Bouabid , Quentin Schulz , Peter Rosin , Jean Delvare , Guenter Roeck , Heiko Stuebner Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org X-Mailer: b4 0.15-dev-99b12 X-ClientProxiedBy: VI1PR0502CA0001.eurprd05.prod.outlook.com (2603:10a6:803:1::14) To DU0PR04MB9562.eurprd04.prod.outlook.com (2603:10a6:10:321::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU0PR04MB9562:EE_|DB9PR04MB9645:EE_ X-MS-Office365-Filtering-Correlation-Id: d29bed12-bdaf-4cb3-1d55-08dccb6db21f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|52116014|7416014|376014|38350700014|921020; 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Signed-off-by: Farouk Bouabid --- Notes: Merge after patches 1,2,3,4 arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boo= t/dts/rockchip/rk3399-puma.dtsi index ccbe3a7a1d2c..72a0bca57385 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -10,6 +10,7 @@ / { aliases { ethernet0 =3D &gmac; + i2c10 =3D &i2c10; mmc0 =3D &sdhci; }; =20 @@ -378,14 +379,25 @@ &i2c7 { clock-frequency =3D <400000>; =20 fan: fan@18 { - compatible =3D "ti,amc6821"; + compatible =3D "tsd,mule", "ti,amc6821"; reg =3D <0x18>; - #cooling-cells =3D <2>; - }; =20 - rtc_twi: rtc@6f { - compatible =3D "isil,isl1208"; - reg =3D <0x6f>; + i2c-mux { + compatible =3D "tsd,mule-i2c-mux"; + #address-cells =3D <1>; + #size-cells =3D <0>; + + i2c10: i2c@0 { + reg =3D <0x0>; + #address-cells =3D <1>; + #size-cells =3D <0>; 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Signed-off-by: Farouk Bouabid --- Notes: Merge after patches 1,2,3,4 arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi b/arch/arm64/bo= ot/dts/rockchip/rk3588-tiger.dtsi index 615094bb8ba3..a02f1178c60c 100644 --- a/arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi @@ -12,6 +12,7 @@ / { compatible =3D "tsd,rk3588-tiger", "rockchip,rk3588"; =20 aliases { + i2c10 =3D &i2c10; mmc0 =3D &sdhci; rtc0 =3D &rtc_twi; }; @@ -224,13 +225,25 @@ &i2c6 { status =3D "okay"; =20 fan@18 { - compatible =3D "ti,amc6821"; + compatible =3D "tsd,mule", "ti,amc6821"; reg =3D <0x18>; - }; =20 - rtc_twi: rtc@6f { - compatible =3D "isil,isl1208"; - reg =3D <0x6f>; + i2c-mux { + compatible =3D "tsd,mule-i2c-mux"; + #address-cells =3D <1>; + #size-cells =3D <0>; + + i2c10: i2c@0 { + reg =3D <0x0>; + #address-cells =3D <1>; + #size-cells =3D <0>; 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Signed-off-by: Farouk Bouabid --- Notes: Merge after patches 1,2,3,4 arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi | 24 ++++++++++++++++++---= --- 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi b/arch/arm64/b= oot/dts/rockchip/px30-ringneck.dtsi index bb1aea82e666..a683ed3e2fce 100644 --- a/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi +++ b/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi @@ -9,6 +9,7 @@ =20 / { aliases { + i2c10 =3D &i2c10; mmc0 =3D &emmc; mmc1 =3D &sdio; rtc0 =3D &rtc_twi; @@ -292,14 +293,25 @@ &i2c1 { clock-frequency =3D <400000>; =20 fan: fan@18 { - compatible =3D "ti,amc6821"; + compatible =3D "tsd,mule", "ti,amc6821"; reg =3D <0x18>; - #cooling-cells =3D <2>; - }; =20 - rtc_twi: rtc@6f { - compatible =3D "isil,isl1208"; - reg =3D <0x6f>; + i2c-mux { + compatible =3D "tsd,mule-i2c-mux"; + #address-cells =3D <1>; + #size-cells =3D <0>; + + i2c10: i2c@0 { + reg =3D <0x0>; + #address-cells =3D <1>; + #size-cells =3D <0>; + + rtc_twi: rtc@6f { + compatible =3D "isil,isl1208"; + reg =3D <0x6f>; + }; + }; + }; }; }; =20 --=20 2.34.1