linux-kernel - Re: [PATCH v2 16/17] sh: I/O DATA HDL-U (a.k.a. landisk) Device Tree

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Date:	Mon, 13 Jun 2016 23:23:41 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 16/17] sh: I/O DATA HDL-U (a.k.a. landisk) Device Tree

On Mon, 13 Jun 2016 17:13:37 +0900,
Geert Uytterhoeven wrote:
> 
> Hi Sato-san,
> 
> On Sun, Jun 12, 2016 at 8:54 AM, Yoshinori Sato
> <ysato@...rs.sourceforge.jp> wrote:
> > --- /dev/null
> > +++ b/arch/sh/boot/dts/landisk.dts
> > @@ -0,0 +1,150 @@
> 
> > +        pllclk: pllclk {
> > +                compatible = "renesas,sh7750-pll-clock";
> > +                clocks = <&oclk>;
> > +                #clock-cells = <0>;
> > +               renesas,mult = <12>;
> > +                reg = <0xffc00000 2>, <0xffc00008 4>;
> > +        };
> > +        iclk: iclk {
> > +                compatible = "renesas,sh7750-div-clock";
> > +                clocks = <&pllclk>;
> > +                #clock-cells = <0>;
> > +                reg = <0xffc00000 2>;
> > +               renesas,offset = <6>;
> > +               clock-output-names = "ick";
> 
> clock-output-names is deprecated for clocks providing a single output.
> 
> > +        };
> > +        bclk: bclk {
> > +                compatible = "renesas,sh7750-div-clock";
> > +                clocks = <&pllclk>;
> > +                #clock-cells = <0>;
> > +                reg = <0xffc00000 2>;
> > +               renesas,offset = <3>;
> > +               clock-output-names = "bck";
> > +        };
> > +        fclk: fclk {
> > +                compatible = "renesas,sh7750-div-clock";
> > +                clocks = <&pllclk>;
> > +                #clock-cells = <0>;
> > +                reg = <0xffc00000 2>;
> > +               renesas,offset = <0>;
> > +               clock-output-names = "fck";
> > +        };
> 
> I think it will be much easier for maintenance and code reuse to just have a
> single "cpg" node that's compatible with "renesas,sh7750-cpg", covering all
> CPG registers. Especially since the various clocks use the same registers.
> 
> Cfr. drivers/clk/renesas/cpg-mssr.c.

OK.
I'll try.

> 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

-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>