Re: [PATCH v1 1/1] arm64: dts: imx91-var-dart-sonata: add RGB select supply for PCA6408

Frank Li
2026-03-27T16:51:45Z

On Fri, Mar 27, 2026 at 05:32:43PM +0100, Stefano Radaelli wrote:
> From: Stefano Radaelli <stefano.r@variscite.com>
>
> RGB_SEL controls the routing of some carrier board lines on the Sonata
> board. The two PCA6408 GPIO expanders depend on that path being enabled,
> so describe the selector as a fixed regulator and use it as their
> vcc-supply.

Does below resolve your problem?
https://lore.kernel.org/imx/20260325-pinctrl-mux-v4-0-043c2c82e623@nxp.com/

So needn't hack select as regualtor

Frank

>
> Signed-off-by: Stefano Radaelli <stefano.r@variscite.com>
> ---
> arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts b/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts
> index afa39dab240a..3b5816884f24 100644
> --- a/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts
> +++ b/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts
> @@ -90,6 +90,13 @@ reg_vref_1v8: regulator-adc-vref {
> regulator-max-microvolt = <1800000>;
> };
>
> + reg_rgb_sel: regulator-rgb-sel {
> + compatible = "regulator-fixed";
> + regulator-name = "rgb-select";
> + gpio = <&pca9534 7 GPIO_ACTIVE_HIGH>;
> + enable-active-high;
> + };
> +
> reg_usdhc2_vmmc: regulator-vmmc-usdhc2 {
> compatible = "regulator-fixed";
> pinctrl-names = "default";
> @@ -195,6 +202,7 @@ pca6408_1: gpio@20 {
> #gpio-cells = <2>;
> interrupt-parent = <&gpio1>;
> interrupts = <10 IRQ_TYPE_LEVEL_LOW>;
> + vcc-supply = <&reg_rgb_sel>;
> };
>
> pca6408_2: gpio@21 {
> @@ -204,6 +212,7 @@ pca6408_2: gpio@21 {
> #gpio-cells = <2>;
> interrupt-parent = <&gpio1>;
> interrupts = <10 IRQ_TYPE_LEVEL_LOW>;
> + vcc-supply = <&reg_rgb_sel>;
> };
>
> pca9534: gpio@22 {
> --
> 2.47.3
>