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Make devm_mux_control_get() call devm_mux_control_get_from_np() with a NULL node parameter, which defaults to using the device's own of_node. Support the following DT schema: pinctrl@0 { uart-func { mux-state =3D <&mux_chip 0>; }; spi-func { mux-state =3D <&mux_chip 1>; }; }; Signed-off-by: Frank Li --- drivers/mux/core.c | 40 ++++++++++++++++++++++++---------------- include/linux/mux/consumer.h | 16 ++++++++++++---- 2 files changed, 36 insertions(+), 20 deletions(-) diff --git a/drivers/mux/core.c b/drivers/mux/core.c index a3840fe0995fe0125432d34edd8ab0f2cd1a6e9a..bdd959389b4ee1b0b8a7367fadf= 2c148c8f2f0b1 100644 --- a/drivers/mux/core.c +++ b/drivers/mux/core.c @@ -522,13 +522,15 @@ static struct mux_chip *of_find_mux_chip_by_node(stru= ct device_node *np) * @mux_name: The name identifying the mux-control. * @state: Pointer to where the requested state is returned, or NULL when * the required multiplexer states are handled by other means. + * @node: the device nodes, use dev->of_node if it is NULL. * * Return: A pointer to the mux-control, or an ERR_PTR with a negative err= no. */ static struct mux_control *mux_get(struct device *dev, const char *mux_nam= e, - unsigned int *state) + unsigned int *state, + struct device_node *node) { - struct device_node *np =3D dev->of_node; + struct device_node *np =3D node ? node : dev->of_node; struct of_phandle_args args; struct mux_chip *mux_chip; unsigned int controller; @@ -617,7 +619,7 @@ static struct mux_control *mux_get(struct device *dev, = const char *mux_name, */ struct mux_control *mux_control_get(struct device *dev, const char *mux_na= me) { - return mux_get(dev, mux_name, NULL); + return mux_get(dev, mux_name, NULL, NULL); } EXPORT_SYMBOL_GPL(mux_control_get); =20 @@ -641,15 +643,17 @@ static void devm_mux_control_release(struct device *d= ev, void *res) } =20 /** - * devm_mux_control_get() - Get the mux-control for a device, with resource - * management. + * devm_mux_control_get_from_np() - Get the mux-control for a device, with + * resource management. * @dev: The device that needs a mux-control. * @mux_name: The name identifying the mux-control. + * @np: the device nodes, use dev->of_node if it is NULL. * * Return: Pointer to the mux-control, or an ERR_PTR with a negative errno. */ -struct mux_control *devm_mux_control_get(struct device *dev, - const char *mux_name) +struct mux_control * +devm_mux_control_get_from_np(struct device *dev, const char *mux_name, + struct device_node *np) { struct mux_control **ptr, *mux; =20 @@ -668,16 +672,18 @@ struct mux_control *devm_mux_control_get(struct devic= e *dev, =20 return mux; } -EXPORT_SYMBOL_GPL(devm_mux_control_get); +EXPORT_SYMBOL_GPL(devm_mux_control_get_from_np); =20 /* * mux_state_get() - Get the mux-state for a device. * @dev: The device that needs a mux-state. * @mux_name: The name identifying the mux-state. + * @np: the device nodes, use dev->of_node if it is NULL. * * Return: A pointer to the mux-state, or an ERR_PTR with a negative errno. */ -static struct mux_state *mux_state_get(struct device *dev, const char *mux= _name) +static struct mux_state * +mux_state_get(struct device *dev, const char *mux_name, struct device_node= *np) { struct mux_state *mstate; =20 @@ -685,7 +691,7 @@ static struct mux_state *mux_state_get(struct device *d= ev, const char *mux_name) if (!mstate) return ERR_PTR(-ENOMEM); =20 - mstate->mux =3D mux_get(dev, mux_name, &mstate->state); + mstate->mux =3D mux_get(dev, mux_name, &mstate->state, np); if (IS_ERR(mstate->mux)) { int err =3D PTR_ERR(mstate->mux); =20 @@ -716,15 +722,17 @@ static void devm_mux_state_release(struct device *dev= , void *res) } =20 /** - * devm_mux_state_get() - Get the mux-state for a device, with resource - * management. + * devm_mux_state_get_from_np() - Get the mux-state for a device, with res= ource + * management. * @dev: The device that needs a mux-control. * @mux_name: The name identifying the mux-control. + * @np: the device nodes, use dev->of_node if it is NULL. * * Return: Pointer to the mux-state, or an ERR_PTR with a negative errno. */ -struct mux_state *devm_mux_state_get(struct device *dev, - const char *mux_name) +struct mux_state * +devm_mux_state_get_from_np(struct device *dev, const char *mux_name, + struct device_node *np) { struct mux_state **ptr, *mstate; =20 @@ -732,7 +740,7 @@ struct mux_state *devm_mux_state_get(struct device *dev, if (!ptr) return ERR_PTR(-ENOMEM); =20 - mstate =3D mux_state_get(dev, mux_name); + mstate =3D mux_state_get(dev, mux_name, np); if (IS_ERR(mstate)) { devres_free(ptr); return mstate; @@ -743,7 +751,7 @@ struct mux_state *devm_mux_state_get(struct device *dev, =20 return mstate; } -EXPORT_SYMBOL_GPL(devm_mux_state_get); +EXPORT_SYMBOL_GPL(devm_mux_state_get_from_np); =20 /* * Using subsys_initcall instead of module_init here to try to ensure - for diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h index 2e25c838f8312532040441ee618424b76378aad7..6300e091035323dd6158d52a55a= 109d43ef120aa 100644 --- a/include/linux/mux/consumer.h +++ b/include/linux/mux/consumer.h @@ -56,9 +56,17 @@ int mux_state_deselect(struct mux_state *mstate); struct mux_control *mux_control_get(struct device *dev, const char *mux_na= me); void mux_control_put(struct mux_control *mux); =20 -struct mux_control *devm_mux_control_get(struct device *dev, - const char *mux_name); -struct mux_state *devm_mux_state_get(struct device *dev, - const char *mux_name); +struct mux_control * +devm_mux_control_get_from_np(struct device *dev, const char *mux_name, + struct device_node *np); 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On some boards, especially development boards, external mux chips are used to switch SoC signals between different peripherals (e.g. MMC and UART). The mux select lines are often driven by a GPIO expander over I2C, as illustrated below: =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=90 = =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=90 =E2=94=82 SOC =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=8C=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=90 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82=E2=94=80=E2=94=80=E2= =94=80=E2=96=BA=E2=94=82 MMC =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 MUX =E2=94=82 =E2=94=94=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=98 =E2=94=82 =E2=94=9C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =96=BA=E2=94=82 =E2=94=82 =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=90 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82=E2=94=80=E2=94=80=E2= =94=80=E2=96=BA=E2=94=82 UART =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=98 =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=98 =E2=94=82 =E2=94=82 =E2=96=B2 =E2=94=82 =E2=94=82 =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=B4=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=90 =E2=94=82 I2C =E2=94=9C=E2=94=80=E2=94=80=E2=94=80=E2=96=BA=E2=94=82 GPIO= Expander =E2=94=82 =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=98 = =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=98 Traditionally, gpio-hog is used to configure the onboard mux at boot. However, the GPIO expander may probe later than consumer devices such as MMC. As a result, the MUX might not be configured when the peripheral driver probes, leading to initialization failures or data transfer errors. Introduce a generic pinctrl binding that models the board-level MUX as a pin control provider and builds proper device links between the MUX, its GPIO controller, and peripheral devices. This ensures correct probe ordering and reliable mux configuration. The implementation leverages the standard multiplexer subsystem, which provides broad support for onboard mux controllers and avoids the need for per-driver custom MUX handling. Allow pinctrl-* pattern as node name because this pinctrl device have not reg property. Signed-off-by: Frank Li --- .../bindings/pinctrl/pinctrl-multiplexer.yaml | 54 ++++++++++++++++++= ++++ .../devicetree/bindings/pinctrl/pinctrl.yaml | 2 +- 2 files changed, 55 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-multiplexer.= yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-multiplexer.yaml new file mode 100644 index 0000000000000000000000000000000000000000..31efffb3167cba724b1afe0d403= a0dcae65582ee --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-multiplexer.yaml @@ -0,0 +1,54 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pinctrl/pinctrl-multiplexer.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic Pin Control Driver for Board-Level Mux Chips + +maintainers: + - Frank Li + +description: + This binding describes a generic pinctrl driver that controls on-board + pinmux chips using the multiplexer subsystem. + +properties: + compatible: + const: pinctrl-multiplexer + +patternProperties: + '-grp$': + type: object + properties: + mux-states: + maxItems: 1 + + required: + - mux-states + +required: + - compatible + +allOf: + - $ref: pinctrl.yaml# + +unevaluatedProperties: false + +examples: + - | + pinctrl-mux { + compatible =3D "pinctrl-multiplexer"; 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Add a generic pinctrl driver built on top of the mux framework to centralize mux handling and avoid probe ordering issues. Keep board-level routing out of individual drivers and supports boot-time only mux selection. Ensure correct probe ordering, especially when the GPIO expander is probed later. Signed-off-by: Frank Li --- drivers/pinctrl/Kconfig | 9 ++ drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-generic-mux.c | 222 ++++++++++++++++++++++++++++++= ++++ 3 files changed, 232 insertions(+) diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index afecd9407f5354f5b92223f8cd80d2f7a08f8e7d..0657eeeeb587fa5e68dc3c1e00b= e35608e243b80 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -274,6 +274,15 @@ config PINCTRL_GEMINI select GENERIC_PINCONF select MFD_SYSCON =20 +config PINCTRL_GENERIC_MUX + tristate "Generic Pinctrl driver by using multiplexer" + depends on MULTIPLEXER + select PINMUX + select GENERIC_PINCONF + help + Generic pinctrl driver by MULTIPLEXER framework to control on + board pin selection. + config PINCTRL_INGENIC bool "Pinctrl driver for the Ingenic JZ47xx SoCs" default MACH_INGENIC diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index f7d5d5f76d0c8becc0aa1d77c68b6ced924ea264..fcd1703440d24579636e8ddb6cb= d83a0a982dfb7 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_PINCTRL_EQUILIBRIUM) +=3D pinctrl-equilibr= ium.o obj-$(CONFIG_PINCTRL_EP93XX) +=3D pinctrl-ep93xx.o obj-$(CONFIG_PINCTRL_EYEQ5) +=3D pinctrl-eyeq5.o obj-$(CONFIG_PINCTRL_GEMINI) +=3D pinctrl-gemini.o +obj-$(CONFIG_PINCTRL_GENERIC_MUX) +=3D pinctrl-generic-mux.o obj-$(CONFIG_PINCTRL_INGENIC) +=3D pinctrl-ingenic.o obj-$(CONFIG_PINCTRL_K210) +=3D pinctrl-k210.o obj-$(CONFIG_PINCTRL_K230) +=3D pinctrl-k230.o diff --git a/drivers/pinctrl/pinctrl-generic-mux.c b/drivers/pinctrl/pinctr= l-generic-mux.c new file mode 100644 index 0000000000000000000000000000000000000000..555dd2966e205e7f90a8bf8df3e= 46ed51d29d562 --- /dev/null +++ b/drivers/pinctrl/pinctrl-generic-mux.c @@ -0,0 +1,222 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic Pin Control Driver for Board-Level Mux Chips + * Copyright (C) 2026 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "core.h" +#include "pinmux.h" + +struct mux_pin_function { + struct mux_state *mux_state; +}; + +struct mux_pinctrl { + struct device *dev; + struct pinctrl_dev *pctl; + + /* mutex protecting the lists */ + struct mutex lock; + int cur_select; +}; + +static int +mux_pinmux_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np_config, + struct pinctrl_map **map, unsigned int *num_maps) +{ + struct mux_pinctrl *mpctl =3D pinctrl_dev_get_drvdata(pctldev); + struct mux_pin_function *function; + struct device *dev =3D mpctl->dev; + const char **pgnames; + int selector; + int group; + int ret; + + *map =3D devm_kcalloc(dev, 1, sizeof(**map), GFP_KERNEL); + if (!map) + return -ENOMEM; + + *num_maps =3D 0; + + function =3D devm_kzalloc(dev, sizeof(*function), GFP_KERNEL); + if (!function) { + ret =3D -ENOMEM; + goto err_func; + } + + pgnames =3D devm_kzalloc(dev, sizeof(*pgnames), GFP_KERNEL); + if (!pgnames) { + ret =3D -ENOMEM; + goto err_pgnames; + } + + pgnames[0] =3D np_config->name; + + guard(mutex)(&mpctl->lock); + + selector =3D pinmux_generic_add_function(mpctl->pctl, np_config->name, + pgnames, 1, function); + if (selector < 0) { + ret =3D selector; + goto err_add_func; + } + + group =3D pinctrl_generic_add_group(mpctl->pctl, np_config->name, NULL, 0= , mpctl); + if (group < 0) { + ret =3D group; + goto err_add_group; + } + + function->mux_state =3D devm_mux_state_get_from_np(pctldev->dev, NULL, np= _config); + if (IS_ERR(function->mux_state)) { + ret =3D PTR_ERR(function->mux_state); + goto err_mux_state_get; + } + + (*map)->type =3D PIN_MAP_TYPE_MUX_GROUP; + (*map)->data.mux.group =3D np_config->name; + (*map)->data.mux.function =3D np_config->name; + + *num_maps =3D 1; + + return 0; + +err_mux_state_get: + pinctrl_generic_remove_group(mpctl->pctl, group); +err_add_group: + pinmux_generic_remove_function(mpctl->pctl, selector); +err_add_func: + devm_kfree(dev, pgnames); +err_pgnames: + devm_kfree(dev, function); +err_func: + devm_kfree(dev, *map); + + return ret; +} + +static void +mux_pinmux_dt_free_map(struct pinctrl_dev *pctldev, struct pinctrl_map *ma= p, + unsigned int num_maps) +{ + struct mux_pinctrl *mpctl =3D pinctrl_dev_get_drvdata(pctldev); + + devm_kfree(mpctl->dev, map); +} + +static const struct pinctrl_ops mux_pinctrl_ops =3D { + .get_groups_count =3D pinctrl_generic_get_group_count, + .get_group_name =3D pinctrl_generic_get_group_name, + .get_group_pins =3D pinctrl_generic_get_group_pins, + .dt_node_to_map =3D mux_pinmux_dt_node_to_map, + .dt_free_map =3D mux_pinmux_dt_free_map, +}; + +static int mux_pinmux_set_mux(struct pinctrl_dev *pctldev, + unsigned int func_selector, + unsigned int group_selector) +{ + struct mux_pinctrl *mpctl =3D pinctrl_dev_get_drvdata(pctldev); + const struct function_desc *function; + struct mux_pin_function *func; + int ret; + + guard(mutex)(&mpctl->lock); + + function =3D pinmux_generic_get_function(pctldev, func_selector); + func =3D function->data; + + if (mpctl->cur_select =3D=3D func_selector) + return 0; + + if (mpctl->cur_select >=3D 0 && mpctl->cur_select !=3D func_selector) + return -EINVAL; + + ret =3D mux_state_select(func->mux_state); + if (ret) + return ret; + + mpctl->cur_select =3D func_selector; + + return 0; +} + +static const struct pinmux_ops mux_pinmux_ops =3D { + .get_functions_count =3D pinmux_generic_get_function_count, + .get_function_name =3D pinmux_generic_get_function_name, + .get_function_groups =3D pinmux_generic_get_function_groups, + .set_mux =3D mux_pinmux_set_mux, +}; + +static int mux_pinctrl_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct mux_pinctrl *mpctl; + struct pinctrl_desc *pctl_desc; + int ret; + + mpctl =3D devm_kzalloc(dev, sizeof(*mpctl), GFP_KERNEL); + if (!mpctl) + return -ENOMEM; + + mpctl->dev =3D dev; + mpctl->cur_select =3D -1; + + platform_set_drvdata(pdev, mpctl); + + pctl_desc =3D devm_kzalloc(dev, sizeof(*pctl_desc), GFP_KERNEL); + if (!pctl_desc) + return -ENOMEM; + + ret =3D devm_mutex_init(dev, &mpctl->lock); + if (ret) + return ret; + + pctl_desc->name =3D dev_name(dev); + pctl_desc->owner =3D THIS_MODULE; + pctl_desc->pctlops =3D &mux_pinctrl_ops; + pctl_desc->pmxops =3D &mux_pinmux_ops; + + ret =3D devm_pinctrl_register_and_init(dev, pctl_desc, mpctl, + &mpctl->pctl); 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The mux is controlled by a GPIO. Add a pinctrl-based multiplexer node to describe this routing and ensure proper probe ordering of the dependent devices. Signed-off-by: Frank Li --- arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot= /dts/freescale/imx8mp-evk.dts index b256be710ea1281465f5cecc7a3b979f2c068e43..1341ee27239fd41a26117adc902= 3524ce50420a7 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts @@ -50,6 +50,25 @@ status { }; }; =20 + can_mux: mux-controller-0 { + compatible =3D "gpio-mux"; + #mux-control-cells =3D <0>; + #mux-state-cells =3D <1>; + mux-gpios =3D <&pca6416 3 GPIO_ACTIVE_HIGH>; + }; + + can_mux_pinctrl: pinctrl-gpiomux { + compatible =3D "pinctrl-multiplexer"; + + can_fun: can-grp { + mux-states =3D <&can_mux 1>; + }; + + pdm_fun: pdm-grp { + mux-states =3D <&can_mux 0>; + }; + }; + memory@40000000 { device_type =3D "memory"; reg =3D <0x0 0x40000000 0 0xc0000000>, @@ -446,7 +465,7 @@ &flexcan1 { =20 &flexcan2 { pinctrl-names =3D "default"; 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Signed-off-by: Frank Li --- arch/arm64/boot/dts/freescale/Makefile | 4 ++++ arch/arm64/boot/dts/freescale/imx8mp-evk-flexcan2.dtso | 15 +++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/f= reescale/Makefile index 700bab4d3e6001fe6cf460fcb09cfe57acc77e36..bd377191a68a6167d5f9a65184d= 19c789a4223ee 100644 --- a/arch/arm64/boot/dts/freescale/Makefile +++ b/arch/arm64/boot/dts/freescale/Makefile @@ -233,6 +233,10 @@ dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-dhcom-pdk3.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-dhcom-picoitx.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-edm-g-wb.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk.dtb + +imx8mp-evk-flexcan2-dtbs +=3D imx8mp-evk.dtb imx8mp-evk-flexcan2.dtbo +dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-flexcan2.dtb + dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-frdm.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-hummingboard-mate.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-hummingboard-pro.dtb diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk-flexcan2.dtso b/arch/= arm64/boot/dts/freescale/imx8mp-evk-flexcan2.dtso new file mode 100644 index 0000000000000000000000000000000000000000..f7d2674c45f72353a20300300e9= 8c8a1eba4a2a6 --- /dev/null +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk-flexcan2.dtso @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright 2026 NXP + */ + +/dts-v1/; +/plugin/; + +&flexcan2 { + status =3D "okay"; /* can2 pin conflict with pdm */ +}; + +&micfil { + status =3D "disabled"; +}; --=20 2.43.0