DM_SERIAL for i.MX6 Hummingboard/Cubox-i

[Fabio Estevam]

Hi Baruch,

On Thu, Nov 3, 2022 at 9:29 AM Baruch Siach <baruch at tkos.co.il> wrote:
>
> Hi u-boot list,
>
> I am trying to migrate the Hummingboard platform to DM_SERIAL. See below
> what I got so far. Booting this on top of master (as of commit
> 8bc87a4c5) shows nothing on the serial console. Next thing I plan to try
> is toggle GPIOs in entry code to see how far the code proceeds.
>
> Any idea where to look before I go down that way?
>
> Thanks,
> baruch
>
> diff --git a/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
> index 400b885e4370..8507b818d4cf 100644
> --- a/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
> +++ b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
> @@ -15,6 +15,10 @@
>         };
>  };
>
> +&uart1 {
> +       u-boot,dm-pre-reloc;
> +};

Here you also need to pass &aips1, &pinctrl_uart1, and &soc.

Please look at the following commit for reference:

commit 8fbca1a8b9b02fbc40147401d9af764e07dc96af
Author: Fabio Estevam <festevam at denx.de>
Date:   Tue Mar 15 17:47:05 2022 -0300

    tbs2910: Convert to DM_SERIAL

    Conversion to DM_SERIAL is mandatory.

    Select DM_SERIAL and add a imx6q-tbs2910-u-boot.dtsi file
    that describes the nodes that require dm-pre-reloc, which allows
    the DM model to configure the UART pinctrl early.

    Remove the now unneeded board UART initialization.

    Signed-off-by: Fabio Estevam <festevam at denx.de>
    Tested-by: Soeren Moch <smoch at web.de>