[PATCH 1/1] riscv: add DT binding for BOOT button on Maix board

[Bin Meng]

On Thu, Sep 3, 2020 at 4:12 AM Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
> Add a device tree binding for the BOOT button on the Maix board.
>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> ---
> Together with
> [PATCH 1/1] cmd/button: return button status
> https://lists.denx.de/pipermail/u-boot/2020-September/425221.html
> we can use the button status to decide which program to boot.
> ---
>  arch/riscv/dts/k210-maix-bit.dts | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/arch/riscv/dts/k210-maix-bit.dts b/arch/riscv/dts/k210-maix-bit.dts
> index e840e04ada..c2beec602c 100644
> --- a/arch/riscv/dts/k210-maix-bit.dts
> +++ b/arch/riscv/dts/k210-maix-bit.dts
> @@ -8,6 +8,7 @@
>  #include "k210.dtsi"
>
>  #include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/input/input.h>
>
>  / {
>         model = "Sipeed Maix Bit 2.0";
> @@ -33,6 +34,16 @@
>                 };
>         };
>
> +       gpio-keys {
> +               compatible = "gpio-keys";
> +
> +               boot {
> +                       label = "BOOT";
> +                       linux,code = <BTN_0>;

I cannot find how U-Boot is handling "linux,code". Any pointers?

> +                       gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
> +               };
> +       };
> +
>         sound {
>                 compatible = "simple-audio-card";
>                 simple-audio-card,format = "i2s";
> --

Regards,
Bin