[PATCH 3/8] dt-bindings: clock: Add rockchip,rk3528-cru

[Conor Dooley]

On Tue, Oct 01, 2024 at 04:23:57AM +0000, Yao Zi wrote:
> Document Rockchip RK3528 clock and reset unit.
> 
> Signed-off-by: Yao Zi <ziyao at disroot.org>
> ---
>  .../bindings/clock/rockchip,rk3528-cru.yaml   | 63 +++++++++++++++++++
>  1 file changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml b/Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml
> new file mode 100644
> index 000000000000..ae51dfde5bb9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/rockchip,rk3528-cru.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip RK3528 Clock and Reset Controller
> +
> +maintainers:
> +  - Yao Zi <ziyao at disroot.org>
> +
> +description: |
> +  The RK3528 clock controller generates the clock and also implements a reset
> +  controller for SoC peripherals. For example, it provides SCLK_UART0 and
> +  PCLK_UART0 as well as SRST_P_UART0 and SRST_S_UART0 for the first UART
> +  module.
> +  Each clock is assigned an identifier, consumer nodes can use it to specify
> +  the clock. All available clock and reset IDs are defined in dt-binding
> +  headers.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - rockchip,rk3528-cru

nit: This can probably be a const, rather than an enum.

> +
> +  reg:
> +    maxItems: 1
> +
> +  assigned-clocks: true
> +
> +  assigned-clock-rates: true
> +
> +  clocks:
> +    minItems: 2
> +    maxItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: xin24m
> +      - const: phy_50m_out

Why is this input clock named "out"? clocks should be named after how
they're used in the IP in question, not the name of the source of that
clock in the SoC.
Without descriptions provided in the clocks property, it is hard to
understand what this second clock is for.

> +
> +  "#clock-cells":
> +    const: 1
> +
> +  "#reset-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg

Why would the input clocks be optional?

> +  - "#clock-cells"
> +  - "#reset-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    cru: clock-controller at ff4a0000 {

nit: the cru label is not used and can be dropped.

Cheers,
Conor.

> +        compatible = "rockchip,rk3528-cru";
> +        reg = <0xff4a0000 0x30000>;
> +        #clock-cells = <1>;
> +        #reset-cells = <1>;
> +    };
> -- 
> 2.46.0
> 
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