linux-kernel - Re: [PATCH v3 1/3] dt-bindings: clock: renesas: Document RZ/V2H(P) SoC CPG

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Message-ID: <CAMuHMdV4GUKc=LFStKHO47vPJLZs3Vmvz-L7L81bC5DmdK5ztA@mail.gmail.com>
Date: Fri, 12 Jul 2024 13:58:30 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Magnus Damm <magnus.damm@...il.com>, 
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: clock: renesas: Document RZ/V2H(P)
 SoC CPG

Hi Prabhakar,

On Thu, Jun 27, 2024 at 6:14 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Document the device tree bindings for the Renesas RZ/V2H(P) SoC
> Clock Pulse Generator (CPG).
>
> CPG block handles the below operations:
> - Generation and control of clock signals for the IP modules
> - Generation and control of resets
> - Control over booting
> - Low power consumption and power supply domains
>
> Also define constants for the core clocks of the RZ/V2H(P) SoC. Note the
> core clocks are a subset of the ones which are listed as part of section
> 4.4.2 of HW manual Rev.1.01 which cannot be controlled by CLKON register.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v2->v3
> - Dropped '|' for CPG description
> - Dropped description for '#power-domain-cells' property
> - Added 3 clock inputs for CPG
> - Dropped label in example node
> - Used 4 spaces for example node
> - Renamed r9a09g057-cpg.h -> renesas,r9a09g057-cpg.h
> - Merged adding renesas,r9a09g057-cpg.h in DT binding patch
> - Updated commit message

Thanks for the update!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/renesas,rzv2h-cpg.yaml
> +  '#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/renesas,r9a09g057-cpg.h>,
> +      - For module clocks, the two clock specifier cells must be "CPG_MOD" and
> +        a module number.  The module number is calculated as the CLKON register
> +        offset index multiplied by 16, plus the actual bit in the register
> +        used to turn the CLK ON. For example, for CGC_GIC_0_GICCLK, the
> +        calculation is (1 * 16 + 3) = 19.

Using hexadecimal for the final number may be more readable,
also in the DTS?

(1 * 16 + 3) = 0x13?

> +    const: 2
> +
> +  '#power-domain-cells':
> +    const: 0
> +
> +  '#reset-cells':
> +    description:
> +      The single reset specifier cell must be the reset number. The reset number
> +      is calculated as the reset register offset index multiplied by 16, plus the
> +      actual bit in the register used to reset the specific IP block. For example,
> +      for SYS_0_PRESETN, the calculation is (3 * 16 + 0) = 48.

(3 * 16 + 0) = 0x30?

> --- /dev/null
> +++ b/include/dt-bindings/clock/renesas,r9a09g057-cpg.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> + *
> + * Copyright (C) 2024 Renesas Electronics Corp.
> + */
> +#ifndef __DT_BINDINGS_CLOCK_R9A09G057_CPG_H__
> +#define __DT_BINDINGS_CLOCK_R9A09G057_CPG_H__

__DT_BINDINGS_CLOCK_RENESAS_R9A09G057_CPG_H__

[...]

> +#endif /* __DT_BINDINGS_CLOCK_R9A09G057_CPG_H__ */

__DT_BINDINGS_CLOCK_RENESAS_R9A09G057_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