[PATCH] ARM: dts: bcm2711-rpi-cm4-io: Add rtc on i2c0

[Dave Stevenson]

Hi

On Mon, 22 Nov 2021 at 15:27, Uwe Kleine-König <uwe at kleine-koenig.org> wrote:
>
> The cm4-io board comes with an PCF85063. Add it to the device tree to make
> it usable.
>
> Signed-off-by: Uwe Kleine-König <uwe at kleine-koenig.org>
> ---
>  arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts b/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts
> index 19600b629be5..1b67ad65e228 100644
> --- a/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts
> +++ b/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts
> @@ -20,6 +20,17 @@ led-pwr {
>         };
>  };
>
> +&i2c0 {
> +       pinctrl-0 = <&i2c0_gpio44>;

This will break the assumption that most users will make that i2c0 is
on GPIOs 0&1 (pins 27&28 on the 40 pin header). This is the case on
all other Pi variants, so having it different on the CM4IO is going to
catch some out.

You can use the i2c-mux-pinctrl module to expose both pin mappings of
the BSC0 peripheral as separate I2C buses, which is what the
downstream device tree does.

  Dave

> +       status = "okay";
> +
> +       rtc at 51 {
> +               /* Attention: An alarm resets the machine */
> +               compatible = "nxp,pcf85063";
> +               reg = <0x51>;
> +       };
> +};
> +
>  &ddc0 {
>         status = "okay";
>  };
>
> base-commit: 8ab774587903771821b59471cc723bba6d893942
> --
> 2.30.2
>
>
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