Re: [PATCH 1/4] dt-bindings: mmc: renesas_sdhi: Add r8a77470 support

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

Hi Fabrizio,

On Fri, Sep 21, 2018 at 1:55 PM Fabrizio Castro
<fabrizio.castro@xxxxxxxxxxxxxx> wrote:
> Document SDHI support for the RZ/G1C (a.k.a. R8A77470) SoC.
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>
> Reviewed-by: Biju Das <biju.das@xxxxxxxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/mmc/tmio_mmc.txt | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
> index c434200..8f3a113 100644
> --- a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
> @@ -17,6 +17,7 @@ Required properties:
>                 "renesas,sdhi-r8a7740" - SDHI IP on R8A7740 SoC
>                 "renesas,sdhi-r8a7743" - SDHI IP on R8A7743 SoC
>                 "renesas,sdhi-r8a7745" - SDHI IP on R8A7745 SoC
> +               "renesas,sdhi-r8a77470" - SDHI IP on R8A77470 SoC
>                 "renesas,sdhi-r8a7778" - SDHI IP on R8A7778 SoC
>                 "renesas,sdhi-r8a7779" - SDHI IP on R8A7779 SoC
>                 "renesas,sdhi-r8a7790" - SDHI IP on R8A7790 SoC

It seems RZ/G1C has two slighty different types of SD card interfaces:
  1. SDHI0 and SDHI2 use SYS-DMAC,
  2. SDHI1 can also be used as an MMC interface, and has an internal DMAC.

Do we need to distinguish between them using the compatible value, or
are there other ways?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds