linux-kernel - Re: [PATCH 01/38] dt-bindings: clock: add rk3562 cru bindings

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Message-ID: <20241222-grandpa-vessel-66e9ca9cde75@spud>
Date: Sun, 22 Dec 2024 14:51:20 +0000
From: Conor Dooley <conor@...nel.org>
To: Kever Yang <kever.yang@...k-chips.com>
Cc: heiko@...ech.de, linux-rockchip@...ts.infradead.org,
	devicetree@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Rob Herring <robh@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Elaine Zhang <zhangqing@...k-chips.com>, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 01/38] dt-bindings: clock: add rk3562 cru bindings

On Fri, Dec 20, 2024 at 06:37:47PM +0800, Kever Yang wrote:
> Document the device tree bindings of the rockchip rk3562 SoC
> clock and reset unit.
> 
> Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
> ---
> 
>  .../bindings/clock/rockchip,rk3562-cru.yaml   | 62 +++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml b/Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml
> new file mode 100644
> index 000000000000..aa8dedf2bfce
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml
> @@ -0,0 +1,62 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/rockchip,rk3562-cru.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip rk3562 Clock and Reset Control Module
> +
> +maintainers:
> +  - Elaine Zhang <zhangqing@...k-chips.com>
> +  - Heiko Stuebner <heiko@...ech.de>
> +
> +description:
> +  The RK3562 clock controller generates the clock and also implements a reset
> +  controller for SoC peripherals. For example it provides SCLK_UART2 and
> +  PCLK_UART2, as well as SRST_P_UART2 and SRST_S_UART2 for the second UART
> +  module.
> +
> +properties:
> +  compatible:
> +    const: rockchip,rk3562-cru
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  "#reset-cells":
> +    const: 1
> +
> +  clocks:
> +    maxItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: xin24m
> +      - const: xin32k
> +
> +  rockchip,grf:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the syscon managing the "general register files" (GRF),
> +      if missing pll rates are not changeable, due to the missing pll
> +      lock status.

Two questions:
- Why would it ever be missing? Seems like you should make it required.
- Why is it not possible to look the grf up by compatible rather than
  phandle?

Cheers,
Conor.

> +
> +required:
> +  - compatible
> +  - reg
> +  - "#clock-cells"
> +  - "#reset-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    clock-controller@...00000 {
> +      compatible = "rockchip,rk3562-cru";
> +      reg = <0xff100000 0x40000>;
> +      #clock-cells = <1>;
> +      #reset-cells = <1>;
> +    };
> -- 
> 2.25.1
> 
> 

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