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Signed-off-by: Tapio Reijonen --- Documentation/devicetree/bindings/mux/gpio-mux.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/mux/gpio-mux.yaml b/Document= ation/devicetree/bindings/mux/gpio-mux.yaml index ef7e33ec85d479ce57c5fe4a780f81a08a6ab6ba..5fb26f4b65d5a24747e515f6ce3= 58eecc36f182f 100644 --- a/Documentation/devicetree/bindings/mux/gpio-mux.yaml +++ b/Documentation/devicetree/bindings/mux/gpio-mux.yaml @@ -29,6 +29,11 @@ properties: description: Regulator to power on the multiplexer. =20 + enable-gpios: + description: + External gpio output that signals mux-gpios are in a valid state. + Logic low when state of the mux is idle, high otherwise. + '#mux-control-cells': enum: [ 0, 1 ] =20 --=20 2.47.3 From nobody Fri Dec 19 12:45:06 2025 Received: from AS8PR04CU009.outbound.protection.outlook.com (mail-westeuropeazon11021073.outbound.protection.outlook.com [52.101.70.73]) (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 F39C4329C62; 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When the gpio mux controller transitions state, it first configures all required gpio mux pins, and then sets optional enable gpio pin to logic high. When gpio mux controller sets "MUX_IDLE_DISCONNECT", the optional enable gpio pin is set low. Signed-off-by: Tapio Reijonen --- drivers/mux/gpio.c | 30 ++++++++++++++++++++++++------ 1 file changed, 24 insertions(+), 6 deletions(-) diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c index 4cc3202c58f364e80ad9f632763f568d184d4173..ee2bca1214d67feb3031fe60556= b68b59293f0e3 100644 --- a/drivers/mux/gpio.c +++ b/drivers/mux/gpio.c @@ -19,6 +19,7 @@ =20 struct mux_gpio { struct gpio_descs *gpios; + struct gpio_desc *enable_gpio; }; =20 static int mux_gpio_set(struct mux_control *mux, int state) @@ -27,10 +28,18 @@ static int mux_gpio_set(struct mux_control *mux, int st= ate) DECLARE_BITMAP(values, BITS_PER_TYPE(state)); u32 value =3D state; =20 + if (mux_gpio->enable_gpio && state =3D=3D MUX_IDLE_DISCONNECT) { + gpiod_set_value_cansleep(mux_gpio->enable_gpio, 0); + return 0; + } + bitmap_from_arr32(values, &value, BITS_PER_TYPE(value)); =20 gpiod_multi_set_value_cansleep(mux_gpio->gpios, values); =20 + if (mux_gpio->enable_gpio) + gpiod_set_value_cansleep(mux_gpio->enable_gpio, 1); + return 0; } =20 @@ -71,14 +80,23 @@ static int mux_gpio_probe(struct platform_device *pdev) WARN_ON(pins !=3D mux_gpio->gpios->ndescs); mux_chip->mux->states =3D BIT(pins); =20 + mux_gpio->enable_gpio =3D devm_gpiod_get_optional(dev, "enable", GPIOD_OU= T_LOW); + if (IS_ERR(mux_gpio->enable_gpio)) + return dev_err_probe(dev, PTR_ERR(mux_gpio->enable_gpio), + "failed to get optional enable gpio\n"); + ret =3D device_property_read_u32(dev, "idle-state", (u32 *)&idle_state); - if (ret >=3D 0 && idle_state !=3D MUX_IDLE_AS_IS) { - if (idle_state < 0 || idle_state >=3D mux_chip->mux->states) { - dev_err(dev, "invalid idle-state %u\n", idle_state); - return -EINVAL; + if (ret >=3D 0) { + if (idle_state =3D=3D MUX_IDLE_DISCONNECT) + mux_chip->mux->idle_state =3D MUX_IDLE_DISCONNECT; + else if (idle_state !=3D MUX_IDLE_AS_IS) { + if (idle_state < 0 || idle_state >=3D mux_chip->mux->states) { + return dev_err_probe(dev, -EINVAL, + "invalid idle-state %d\n", + idle_state); + } + mux_chip->mux->idle_state =3D idle_state; } - - mux_chip->mux->idle_state =3D idle_state; } =20 ret =3D devm_regulator_get_enable_optional(dev, "mux"); --=20 2.47.3