linux-kernel - Re: [PATCH v6 3/6] dt-bindings: clock: renesas,rzn1-clocks: document RZ/N1 clock driver

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Message-ID: <CAMuHMdUW-tteZ26J4rd9=KsrHotjCs7BR_pjyjFQnfoOF5=oFQ@mail.gmail.com>
Date:   Tue, 22 May 2018 20:42:46 +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>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v6 3/6] dt-bindings: clock: renesas,rzn1-clocks: document
 RZ/N1 clock driver

Hi Michel,

On Tue, May 22, 2018 at 12:01 PM, Michel Pollet
<michel.pollet@...renesas.com> wrote:
> The Renesas RZ/N1 Family (Part #R9A06G0xx) requires a driver
> to provide the SoC clock infrastructure for Linux.
>
> This documents the driver bindings.
>
> Signed-off-by: Michel Pollet <michel.pollet@...renesas.com>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/renesas,rzn1-clocks.txt
> @@ -0,0 +1,44 @@
> +* Renesas RZ/N1 Clock Driver
> +
> +This driver provides the clock infrastructure used by all the other drivers.
> +
> +One of the 'special' feature of this infrastructure is that Linux doesn't
> +necessary 'own' all the clocks on the SoC, some other OS runs on
> +the Cortex-M3 core and that OS can access and claim it's own clocks.
> +
> +Required Properties:
> +
> +  - compatible: Must be
> +    - "renesas,r9a06g032-clocks" for the RZ/N1D
> +    and "renesas,rzn1-clocks" as a fallback.

Why the fallback? I doubt all existing (and future) RZ/N1D SoCs provide the
exact same clock hierarchy.

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