[PATCH v4 7/7] ARM: dts: rockchip: rk3506: Add pinctrl and rmio dtsi for rk3506

[Linus Walleij]

Hi Ye,

thanks for your patch!

On Sat, Dec 27, 2025 at 12:55 PM Ye Zhang <ye.zhang at rock-chips.com> wrote:

> +&pinctrl {
> +       rm_io0 {
> +               /omit-if-no-ref/
> +               rm_io0_uart1_tx: rm-io0-uart1-tx {
> +                       rockchip,pins =
> +                               <0 RK_PA0 7 &pcfg_pull_none>;
> +                       rockchip,rmio-pins =
> +                               <0 0 1>;
> +               };

This is just adding more and more "necessarily different"
pinmux to these poor DTS files.

I would do this:

&pinctrl {
      rm_io0 {
              rm_io0_uart1_tx: rm-io0-uart1-tx {
                  iomux {
                      pinmux =  <0<<16 | RK_PA0 << 8 | 7>;
                      bias-disable;
                  };
                  rmio {
                      pinmux = <0 << 16 | 0 << 8 << | 1>;
                  };
              };

If this requires some changes to the iomux driver to handle pinmux = <>;
as well and some code to handle subnodes for each pin controller,
that's fine. It's just work.

I need the DT bindings maintainers word on this, especially Conor
who has worked a bit on standardizing pin control bindings.

Yours,
Linus Walleij