linux-kernel - Re: [PATCH 2/4] dt-bindings: arm: renesas: Document Renesas RZ/V2H{P} System Controller

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Date: Mon, 26 Feb 2024 14:41:43 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Magnus Damm <magnus.damm@...il.com>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, linux-renesas-soc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 2/4] dt-bindings: arm: renesas: Document Renesas RZ/V2H{P}
 System Controller

Hi Prabhakar,

Thanks for your patch!

On Mon, Feb 19, 2024 at 5:10 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Add DT binding documentation for System Controller (SYS) found on
> RZ/V2H{P} ("R9A09G057") SoC's.

RZ/V2H(P)

>
> SYS block contains the SYS_LSI_DEVID register which can be used to
> retrieve SoC version information.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/renesas/renesas,r9a09g057-sysyaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/renesas/renesas,r9a09g057-sys.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas RZ/V2H{P} System Controller (SYS)
> +
> +maintainers:
> +  - Geert Uytterhoeven <geert+renesas@...der.be>
> +
> +description:
> +  The RZ/V2H{P} SYS (System Controller) controls the overall

RZ/V2H(P)

> +  configuration of the LSI and supports the following functions,
> +  - Trust zone control
> +  - Extend access by specific masters to address beyond 4GB space
> +  - GBETH configuration
> +  - Control of settings and states of SRAM/PCIe/CM33/CA55/CR8/xSPI/ADC/TSU
> +  - LSI version
> +  - WDT stop control
> +  - General registers
> +
> +properties:
> +  compatible:
> +    const: renesas,r9a09g057-sys
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Clock from external oscillator

Isn't this SYS_0_PCLK inside the CPG?

> +
> +  resets:
> +    items:
> +      - description: SYS_0_PRESETN reset signal
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    extal_clk: extal-clk {
> +        compatible = "fixed-clock";
> +        #clock-cells = <0>;
> +        clock-frequency = <24000000>;
> +    };
> +
> +    sys: system-controller@...30000 {
> +        compatible = "renesas,r9a09g057-sys";
> +        reg = <0x10430000 0x10000>;
> +        clocks = <&extal_clk>;

clocks = <&cpg 1>;

(I guess it will be 1 ;-)

> +        resets = <&cpg 1>;
> +    };

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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