linux-kernel - Re: [PATCH v2 07/12] dt-bindings: clock: renesas: Document RZ/G2L SoC CPG driver

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Date:   Tue, 8 Jun 2021 17:08:45 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Linux-Renesas <linux-renesas-soc@...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>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 07/12] dt-bindings: clock: renesas: Document RZ/G2L SoC
 CPG driver

Hi Prabhakar,

On Fri, Jun 4, 2021 at 12:18 AM 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>
> Acked-by: Rob Herring <robh@...nel.org>

IIRC, Rob gave his R-b, not his A-b.

> --- /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 Standby Mode
> +
> +maintainers:
> +  - Geert Uytterhoeven <geert+renesas@...der.be>
> +
> +description: |
> +  On Renesas RZ/G2L SoC, the CPG (Clock Pulse Generator) and Module
> +  Standby Mode share the same register block.
> +
> +  They provide the following functionalities:
> +    - The CPG block generates various core clocks,
> +    - The Module Standby Mode 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,r9a07g044-cpg  # RZ/G2{L,LC,UL}

Shouldn't RZ/G2UL use renesas,r9a07g043-cpg?

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: extal
> +
> +  '#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/r9a07g044l-cpg.h>

r9a07g044-cpg.h

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

r9a07g044-cpg.h

> +    const: 2
> +
> +  '#power-domain-cells':
> +    description:
> +      SoC devices that are part of the CPG/Module Standby Mode Clock Domain and
> +      can be power-managed through Module Stop should refer to the CPG device

Module Standby

> +      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 <dt-bindings/clock/r9a07g044l-cpg.h>.

r9a07g044-cpg.h

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