linux-kernel - Re: [PATCH 1/2] phy: rcar-gen2: add fallback binding

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Date:	Wed, 2 Mar 2016 10:37:31 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Simon Horman <horms+renesas@...ge.net.au>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Magnus Damm <magnus.damm@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH 1/2] phy: rcar-gen2: add fallback binding

On Wed, Mar 2, 2016 at 3:37 AM, Simon Horman <horms+renesas@...ge.net.au> wrote:
> In the case of Renesas R-Car hardware we know that there are generations of
> SoCs, e.g. Gen 2 and Gen 3. But beyond that its not clear what the
> relationship between IP blocks might be. For example, I believe that
> r8a7790 is older than r8a7791 but that doesn't imply that the latter is a
> descendant of the former or vice versa.
>
> We can, however, by examining the documentation and behaviour of the
> hardware at run-time observe that the current driver implementation appears
> to be compatible with the IP blocks on SoCs within a given generation.
>
> For the above reasons and convenience when enabling new SoCs a
> per-generation fallback compatibility string scheme being adopted for
> drivers for Renesas SoCs.
>
> Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>

> --- a/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
> @@ -7,6 +7,12 @@ Required properties:
>  - compatible: "renesas,usb-phy-r8a7790" if the device is a part of R8A7790 SoC.
>               "renesas,usb-phy-r8a7791" if the device is a part of R8A7791 SoC.
>               "renesas,usb-phy-r8a7794" if the device is a part of R8A7794 SoC.
> +             "renesas,usb-phy-gen2" for a generic R-Car Gen2 compatible device.

"renesas,rcar-gen2-usb-phy"?

Gr{oetje,eeting}s,

                        Geert

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