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

[Geert Uytterhoeven]

Hi Prabhakar,

On Fri, May 14, 2021 at 9:23 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
> Reviewed-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>

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@xxxxxxxxx>
> +
> +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?

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>

> +      - 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>?

> +    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>?

> +    const: 1

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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