netdev - Re: [PATCH can-next 1/2] CAN: rcar: add gen[12] fallback compatibility strings

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Message-ID: <20160223000346.GE1853@verge.net.au>
Date:	Tue, 23 Feb 2016 09:03:47 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Magnus Damm <magnus.damm@...il.com>, linux-can@...r.kernel.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-renesas-soc@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH can-next 1/2] CAN: rcar: add gen[12] fallback
 compatibility strings

On Mon, Feb 22, 2016 at 04:40:39PM +0100, Geert Uytterhoeven wrote:
> On Mon, Feb 22, 2016 at 3:15 AM, Simon Horman
> <horms+renesas@...ge.net.au> wrote:
> > Add fallback compatibility string for R-Car Gen 1 and Gen2 families.
> > This is in keeping with the fallback scheme being adopted wherever
> > appropriate for drivers for Renesas SoCs.
> >
> > Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
> > ---
> >  Documentation/devicetree/bindings/net/can/rcar_can.txt | 4 +++-
> >  drivers/net/can/rcar_can.c                             | 2 ++
> >  2 files changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/net/can/rcar_can.txt b/Documentation/devicetree/bindings/net/can/rcar_can.txt
> > index 002d8440bf66..036786e1f70d 100644
> > --- a/Documentation/devicetree/bindings/net/can/rcar_can.txt
> > +++ b/Documentation/devicetree/bindings/net/can/rcar_can.txt
> > @@ -6,6 +6,8 @@ Required properties:
> >               "renesas,can-r8a7779" if CAN controller is a part of R8A7779 SoC.
> >               "renesas,can-r8a7790" if CAN controller is a part of R8A7790 SoC.
> >               "renesas,can-r8a7791" if CAN controller is a part of R8A7791 SoC.
> > +             "renesas,can-gen1" for a generic R-Car Gen1 compatible device.
> > +             "renesas,can-gen2" for a generic R-Car Gen2 compatible device.
> 
> "renesas,rcar-gen1-can", "renesas,rcar-gen2-can"?
> 
> (Yeah, "can" looks a lot like "rcar" ;-)

Sure, I'll update that as you suggest.

> Nothing further to say about SoC-specific vs. generic compatible values?

Sure, I'll add some text about that.

> >  - reg: physical base address and size of the R-Car CAN register map.
> >  - interrupts: interrupt specifier for the sole interrupt.
> >  - clocks: phandles and clock specifiers for 3 CAN clock inputs.
> > @@ -25,7 +27,7 @@ Example
> >  SoC common .dtsi file:
> >
> >         can0: can@...80000 {
> > -               compatible = "renesas,can-r8a7791";
> > +               compatible = "renesas,can-r8a7791", "renesas,can-gen2";
> 
> "renesas,rcar-gen2-can".
> 
> >                 reg = <0 0xe6e80000 0 0x1000>;
> >                 interrupts = <0 186 IRQ_TYPE_LEVEL_HIGH>;
> >                 clocks = <&mstp9_clks R8A7791_CLK_RCAN0>,
> > diff --git a/drivers/net/can/rcar_can.c b/drivers/net/can/rcar_can.c
> > index bc46be39549d..c70a1f795933 100644
> > --- a/drivers/net/can/rcar_can.c
> > +++ b/drivers/net/can/rcar_can.c
> > @@ -904,6 +904,8 @@ static const struct of_device_id rcar_can_of_table[] __maybe_unused = {
> >         { .compatible = "renesas,can-r8a7779" },
> >         { .compatible = "renesas,can-r8a7790" },
> >         { .compatible = "renesas,can-r8a7791" },
> > +       { .compatible = "renesas,can-gen1" },
> > +       { .compatible = "renesas,can-gen2" },
> 
> "renesas,rcar-gen1-can"
> "renesas,rcar-gen2-can".
> 
> 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