[PATCH/RFC v2 1/2] arm64: dts: r8a7795: Add support for R-Car H3 ES2.0

[Geert Uytterhoeven]

Hi Laurent,

On Mon, Mar 27, 2017 at 10:48 AM, Laurent Pinchart
<laurent.pinchart at ideasonboard.com> wrote:
> On Friday 24 Mar 2017 14:37:44 Geert Uytterhoeven wrote:
>> Update r8a7795.dtsi so it corresponds to R-Car H3 ES2.0 or later:
>>   - The following devices no longer exist on ES2.0, and are thus removed:
>>     fcpf2, fcpvd3, fcpvi2, fdp1-2, usb3-if1, vspd3, vspi2.
>>   - The DU <-> VSPD topology is different on ES2.0, hence remove the
>>     "vsps" property from the DU node until the driver can handle this.
>
> I think I'll need a different compatible string between ES1.x and ES2 for the
> DU. It could make sense to move the whole DU node to *-es1.dtsi. We can decide
> about that later when I'll have a DU driver prototype ready.

Why would you need a different compatible string?
Can't you use soc_device_match() to handle ES1.x SoCs?

The different DU <-> VSPD topology is handled through the vsps property in DTS.
Are the ports different, too? That can be handled in DTS.

The main reason why I kept the DU node in r8a7795.dtsi is that the board DTS
refers to it.  Sharing board DTS means there needs to be at least a
placeholder node for the DU in r8a7795.dtsi, unless you want to keep on
shuffling board overrides around.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

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