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The devices on the mux can be selected by writing the appropriate device number to an I2C config register. Signed-off-by: Farouk Bouabid Reviewed-by: Rob Herring (Arm) --- .../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, 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 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 = "tsd,mule-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + rtc@6f { + compatible = "isil,isl1208"; + reg = <0x6f>; + }; + }; + }; +... + From patchwork Mon Jul 8 16:12:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Farouk Bouabid X-Patchwork-Id: 13726829 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2EF23C3DA42 for ; Mon, 8 Jul 2024 16:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Cc:To:In-Reply-To: References:Message-Id:Subject:Date:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; 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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. Signed-off-by: Farouk Bouabid --- drivers/i2c/muxes/Kconfig | 16 ++++ drivers/i2c/muxes/Makefile | 1 + drivers/i2c/muxes/i2c-mux-mule.c | 155 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 172 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. +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) += i2c-mux-gpio.o obj-$(CONFIG_I2C_MUX_GPMUX) += i2c-mux-gpmux.o obj-$(CONFIG_I2C_MUX_LTC4306) += i2c-mux-ltc4306.o obj-$(CONFIG_I2C_MUX_MLXCPLD) += i2c-mux-mlxcpld.o +obj-$(CONFIG_I2C_MUX_MULE) += i2c-mux-mule.o obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o obj-$(CONFIG_I2C_MUX_PINCTRL) += i2c-mux-pinctrl.o diff --git a/drivers/i2c/muxes/i2c-mux-mule.c b/drivers/i2c/muxes/i2c-mux-mule.c new file mode 100644 index 000000000000..062596869651 --- /dev/null +++ b/drivers/i2c/muxes/i2c-mux-mule.c @@ -0,0 +1,155 @@ +// 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 inline int __mux_select(struct regmap *regmap, u32 dev) +{ + return regmap_write(regmap, MUX_CONFIG_REG, dev); +} + +static int mux_select(struct i2c_mux_core *muxc, u32 dev) +{ + struct mule_i2c_reg_mux *mux = muxc->priv; + + return __mux_select(mux->regmap, 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 = 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 = &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 = of_get_child_count(mux_dev->of_node); + dev_dbg(mux_dev, "%d devices on the mux\n", ndev); + + client = to_i2c_client(mux_dev->parent); + + muxc = i2c_mux_alloc(client->adapter, mux_dev, ndev, sizeof(*priv), + I2C_MUX_LOCKED, mux_select, mux_deselect); + if (!muxc) + return dev_err_probe(mux_dev, -ENOMEM, + "Failed to allocate mux struct\n"); + + priv = i2c_mux_priv(muxc); + + priv->regmap = 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 = mux_select(muxc, MUX_DEFAULT_DEV); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to write config register\n"); + + ret = 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 = (readback != MUX_DEFAULT_DEV); + + ret = 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 = 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 != 0) { + dev_warn(mux_dev, + "Mux is not supported, please update Mule FW\n"); + continue; + } + + ret = mux_select(muxc, reg); + if (ret) { + dev_warn(mux_dev, + "Device %d not supported, please update Mule FW\n", reg); + continue; + } + + ret = i2c_mux_add_adapter(muxc, 0, reg); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to add i2c mux adapter %d\n", reg); + } + + mux_deselect(muxc, MUX_DEFAULT_DEV); + + return 0; +} + +static const struct of_device_id mule_i2c_mux_of_match[] = { + {.compatible = "tsd,mule-i2c-mux",}, + {}, +}; +MODULE_DEVICE_TABLE(of, mule_i2c_mux_of_match); + +static struct platform_driver mule_i2c_mux_driver = { + .driver = { + .name = "mule-i2c-mux", + .of_match_table = mule_i2c_mux_of_match, + }, + .probe = mule_i2c_mux_probe, +}; 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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) Signed-off-by: Farouk Bouabid --- .../devicetree/bindings/i2c/tsd,mule.yaml | 63 ++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/tsd,mule.yaml b/Documentation/devicetree/bindings/i2c/tsd,mule.yaml new file mode 100644 index 000000000000..dbbabba8dd6f --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/tsd,mule.yaml @@ -0,0 +1,63 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/tsd,mule.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Theobroma Systems Mule I2C device + +maintainers: + - Farouk Bouabid + - Quentin Schulz + +description: | + Theobroma Systems Mule is an MCU that emulates a set of I2C devices, among + which is an amc6821 and other 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 (amc6821: reg 0xff) + +additionalProperties: true + +properties: + compatible: + contains: + enum: + - tsd,mule + - ti,amc6821 + + reg: + maxItems: 1 + +required: + - compatible + - reg + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + fan@18 { + compatible = "tsd,mule", "ti,amc6821"; + reg = <0x18>; + + i2c-mux { + compatible = "tsd,mule-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + rtc@6f { + compatible = "isil,isl1208"; + reg = <0x6f>; + }; + }; + }; + }; + }; +... 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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. Signed-off-by: Farouk Bouabid --- drivers/hwmon/amc6821.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c index 0661cc6a6f8e..93c3b79b5f13 100644 --- a/drivers/hwmon/amc6821.c +++ b/drivers/hwmon/amc6821.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include @@ -895,8 +896,17 @@ static const struct regmap_config amc6821_regmap_config = { .cache_type = REGCACHE_MAPLE, }; +static const struct regmap_config amc6821_mule_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xff, + .volatile_reg = amc6821_volatile_reg, + .cache_type = REGCACHE_MAPLE, +}; + static int amc6821_probe(struct i2c_client *client) { + const struct regmap_config *config; struct device *dev = &client->dev; struct amc6821_data *data; struct device *hwmon_dev; @@ -907,7 +917,10 @@ static int amc6821_probe(struct i2c_client *client) if (!data) return -ENOMEM; - regmap = devm_regmap_init_i2c(client, &amc6821_regmap_config); + config = of_device_is_compatible(dev->of_node, "tsd,mule") ? + &amc6821_mule_regmap_config : &amc6821_regmap_config; + + regmap = devm_regmap_init_i2c(client, config); if (IS_ERR(regmap)) return dev_err_probe(dev, PTR_ERR(regmap), "Failed to initialize regmap\n"); @@ -917,6 +930,13 @@ static int amc6821_probe(struct i2c_client *client) if (err) return err; + if (of_device_is_compatible(dev->of_node, "tsd,mule")) { + err = devm_of_platform_populate(dev); + if (err) + return dev_err_probe(dev, err, + "Failed to create sub-devices\n"); + } + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &amc6821_chip_info, amc6821_groups); @@ -934,6 +954,9 @@ static const struct of_device_id __maybe_unused amc6821_of_match[] = { { .compatible = "ti,amc6821", }, + { + .compatible = "tsd,mule", + }, { } }; From patchwork Mon Jul 8 16:12:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Farouk Bouabid X-Patchwork-Id: 13726834 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 134D5C3271E for ; 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Signed-off-by: Farouk Bouabid --- 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/boot/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 { aliases { ethernet0 = &gmac0; + i2c10 = &i2c10; mmc0 = &sdhci; mmc1 = &sdmmc; rtc0 = &rtc_twi; @@ -276,8 +277,25 @@ &i2c0 { status = "okay"; fan@18 { - compatible = "ti,amc6821"; + compatible = "tsd,mule", "ti,amc6821"; reg = <0x18>; + + i2c-mux { + compatible = "tsd,mule-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + + i2c10: i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + rtc_twi: rtc@6f { + compatible = "isil,isl1208"; + reg = <0x6f>; + }; + }; + }; }; vdd_npu_s0: regulator@42 { @@ -313,11 +331,6 @@ regulator-state-mem { regulator-off-in-suspend; 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Signed-off-by: Farouk Bouabid --- 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/boot/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 = &gmac; + i2c10 = &i2c10; mmc0 = &sdhci; }; @@ -378,14 +379,25 @@ &i2c7 { clock-frequency = <400000>; fan: fan@18 { - compatible = "ti,amc6821"; + compatible = "tsd,mule", "ti,amc6821"; reg = <0x18>; - #cooling-cells = <2>; - }; - rtc_twi: rtc@6f { - compatible = "isil,isl1208"; - reg = <0x6f>; + i2c-mux { + compatible = "tsd,mule-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + + i2c10: i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + rtc_twi: rtc@6f { + compatible = "isil,isl1208"; + reg = <0x6f>; + }; + }; + }; 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Signed-off-by: Farouk Bouabid --- 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/boot/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 = "tsd,rk3588-tiger", "rockchip,rk3588"; aliases { + i2c10 = &i2c10; mmc0 = &sdhci; rtc0 = &rtc_twi; }; @@ -224,13 +225,25 @@ &i2c6 { status = "okay"; fan@18 { - compatible = "ti,amc6821"; + compatible = "tsd,mule", "ti,amc6821"; reg = <0x18>; - }; - rtc_twi: rtc@6f { - compatible = "isil,isl1208"; - reg = <0x6f>; + i2c-mux { + compatible = "tsd,mule-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + + i2c10: i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + rtc_twi: rtc@6f { + compatible = "isil,isl1208"; + reg = <0x6f>; 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Signed-off-by: Farouk Bouabid --- 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/boot/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 @@ / { aliases { + i2c10 = &i2c10; mmc0 = &emmc; mmc1 = &sdio; rtc0 = &rtc_twi; @@ -292,14 +293,25 @@ &i2c1 { clock-frequency = <400000>; fan: fan@18 { - compatible = "ti,amc6821"; + compatible = "tsd,mule", "ti,amc6821"; reg = <0x18>; - #cooling-cells = <2>; - }; - rtc_twi: rtc@6f { - compatible = "isil,isl1208"; - reg = <0x6f>; + i2c-mux { + compatible = "tsd,mule-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + + i2c10: i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + rtc_twi: rtc@6f { + compatible = "isil,isl1208"; + reg = <0x6f>; + }; + }; + }; }; };