linux-kernel - Re: [PATCH 11/16] dt-bindings: clock: renesas: Document RZ/G2L SoC CPG driver

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Date:   Fri, 21 May 2021 19:42:35 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH 11/16] dt-bindings: clock: renesas: Document RZ/G2L SoC
 CPG driver

Hi Geert,

Thank you for the review.

On Fri, May 21, 2021 at 4:04 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Fri, May 14, 2021 at 9:23 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > Document the device tree bindings of the Renesas RZ/G2L SoC clock
> > driver in Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
>
> Thanks for your patch!
>
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml
> > @@ -0,0 +1,80 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/clock/renesas,rzg2l-cpg.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +
> > +title: Renesas RZ/G2L Clock Pulse Generator / Module Stop and Software Reset
>
> (Module Standby Mode
> > +
> > +maintainers:
> > +  - Geert Uytterhoeven <geert+renesas@...der.be>
> > +
> > +description: |
> > +  On Renesas RZ/G2L SoC, the CPG (Clock Pulse Generator) and MSTP
> > +  (Module Stop and Software Reset) share the same register block.
> > +
> > +  They provide the following functionalities:
> > +    - The CPG block generates various core clocks,
> > +    - The MSTP block provides two functions:
> > +        1. Module Stop, providing a Clock Domain to control the clock supply
> > +           to individual SoC devices,
> > +        2. Reset Control, to perform a software reset of individual SoC devices.
> > +
> > +properties:
> > +  compatible:
> > +    const: renesas,r9a07g044l-cpg  # RZ/G2L
>
> renesas,r9a07g044-cpg?
>
As some IP blocks present in RZ/G2L aren't present in RZ/G2LC clock
handling will differ so as a result SoC specific compatible string is
added.

> I believe it's the same block on RZ/G2L ('044l) and RZ/G2LC ('044c).
>
> > +  '#clock-cells':
> > +    description: |
> > +      - For CPG core clocks, the two clock specifier cells must be "CPG_CORE"
> > +        and a core clock reference, as defined in
> > +        <dt-bindings/clock/*-cpg-mssr.h>
>
> <dt-bindings/clock/r9a07g044l-cpg.h>
>
Indeed

> > +      - For module clocks, the two clock specifier cells must be "CPG_MOD" and
> > +        a module number, as defined in the datasheet.
>
> Also in <dt-bindings/clock/r9a07g044l-cpg.h>?
>
Agreed.

> > +    const: 2
> > +
> > +  '#power-domain-cells':
> > +    description:
> > +      SoC devices that are part of the CPG/MSTP Clock Domain and can be
> > +      power-managed through Module Stop should refer to the CPG device node
> > +      in their "power-domains" property, as documented by the generic PM Domain
> > +      bindings in Documentation/devicetree/bindings/power/power-domain.yaml.
> > +    const: 0
> > +
> > +  '#reset-cells':
> > +    description:
> > +      The single reset specifier cell must be the module number, as defined in
> > +      the datasheet.
>
> Also in <dt-bindings/clock/r9a07g044l-cpg.h>?
>
Agreed.

Cheers,
Prabhakar

> > +    const: 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