linux-kernel - Re: [PATCH v7 2/5] dt-bindings: clock: renesas,r9a06g032-sysctrl: documentation

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Message-ID: <CAMuHMdUb4fWFB9oP41ejO0_FDxmgBPL0GxQnkFv18Zfb5=1-fw@mail.gmail.com>
Date:   Fri, 25 May 2018 11:23:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Michel Pollet <michel.pollet@...renesas.com>
Cc:     Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Simon Horman <horms@...ge.net.au>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Michel Pollet <buserror+upstream@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 2/5] dt-bindings: clock: renesas,r9a06g032-sysctrl: documentation

Hi Michel,

On Thu, May 24, 2018 at 11:28 AM, Michel Pollet
<michel.pollet@...renesas.com> wrote:
> The Renesas R9A06G032 SYSCTRL node description.
>
> Signed-off-by: Michel Pollet <michel.pollet@...renesas.com>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/renesas,r9a06g032-sysctrl.txt
> @@ -0,0 +1,32 @@
> +* Renesas R9A06G032 SYSCTRL
> +
> +Required Properties:
> +
> +  - compatible: Must be:
> +    - "renesas,r9a06g032-sysctrl"
> +  - reg: Base address and length of the SYSCTRL IO block.
> +  - #clock-cells: Must be 1

No clocks/clock-names for the external clock inputs?

"RZ/N1 has 3 clock sources, 1 reference clock inputs for RGMII, and 2
 reference clock outputs for RMII/MII."

Given the documentation explicitly mentions the module clocks are to be
used for power-management, you may want to add #power-domain-cells as well,
and let the driver register clock domain. But that can be added later
(although it will break backwards compatibility with old DTBs).

As PWRCTRL_* registers allow to reset individual modules, #reset-cells is
another thing to add later.  It's good to start thinking early about how to
reference resets, though.
E.g. on other Renesas-SoCs, module resets uses the same numerical
references as module clocks.


> +
> +Examples
> +--------
> +
> +  - SYSCTRL node:
> +
> +       sysctrl: sysctrl@...0c000 {

system-controller@

> +               compatible = "renesas,r9a06g032-sysctrl";
> +               reg = <0x4000c000 0x1000>;
> +               #clock-cells = <1>;
> +       };

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