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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: ┌──────┐ ┌─────┐ │ SOC │ │ │ ┌───────┐ │ │ │ │───►│ MMC │ │ │ │ MUX │ └───────┘ │ ├─────►│ │ ┌───────┐ │ │ │ │───►│ UART │ │ │ └─────┘ └───────┘ │ │ ▲ │ │ ┌────┴──────────────┐ │ I2C ├───►│ GPIO Expander │ └──────┘ └───────────────────┘ 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 Signed-off-by: Frank Li --- Changes in v4: - use Conor Dooley suggest to extract funciton pinctrl_generic_pins_to_map() - Link to v3: https://lore.kernel.org/r/20260311-pinctrl-mux-v3-0-236b1c17bf9b@nxp.com Changes in v3: - collect rob's review tag for binding - extend and use pinctrl_generic_pins_function_dt_node_to_map() - add judgement about commit 2243a87d90b42eb38bc281957df3e57c712b5e56 "pinctrl: avoid duplicated calling enable_pinmux_setting for a pin" which call pinmux_disable_setting() before pinmux_enable_setting() when switch state. It is actually what wanted. Previous remove .disable() to avoid hardware glitch when switch state. New .release_mux() call intent just release software resource, like lock, don't touch hardware register. No glitch involve. Comments already added Linus Walleij: I hope this answer all of your questions. If I missed, let me know - Link to v2: https://lore.kernel.org/r/20260225-pinctrl-mux-v2-0-1436a25fa454@nxp.com Changes in v2: - Add release_mux callback, test insmod/rmmod, mux_state_(de)select() called. - Link to v1: https://lore.kernel.org/r/20260219-pinctrl-mux-v1-0-678d21637788@nxp.com --- Frank Li (7): mux: add devm_mux_control_get_from_np() to get mux from child node dt-bindings: pinctrl: Add generic pinctrl for board-level mux chips pinctrl: extract pinctrl_generic_to_map() from pinctrl_generic_pins_function_dt_node_to_map() pinctrl: add optional .release_mux() callback pinctrl: add generic board-level pinctrl driver using mux framework arm64: dts: imx8mp-evk: add board-level mux for CAN2 and MICFIL arm64: dts: imx8mp-evk: add flexcan2 overlay file .../bindings/pinctrl/pinctrl-multiplexer.yaml | 57 ++++++ .../devicetree/bindings/pinctrl/pinctrl.yaml | 2 +- arch/arm64/boot/dts/freescale/Makefile | 4 + .../boot/dts/freescale/imx8mp-evk-flexcan2.dtso | 15 ++ arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 23 ++- drivers/mux/core.c | 40 +++-- drivers/pinctrl/Kconfig | 9 + drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinconf.h | 18 ++ drivers/pinctrl/pinctrl-generic-mux.c | 197 +++++++++++++++++++++ drivers/pinctrl/pinctrl-generic.c | 91 ++++++---- drivers/pinctrl/pinmux.c | 5 + include/linux/mux/consumer.h | 16 +- include/linux/pinctrl/pinmux.h | 5 + 14 files changed, 425 insertions(+), 58 deletions(-) --- base-commit: ff76d257e86235eb07ef33db8644a517c48d1c3f change-id: 20260213-pinctrl-mux-df9c5b661540 Best regards, -- Frank Li