linux-kernel - Re: [PATCH v2 1/2] dt-bindings: clock: Add binding documentation for TI syscon gate clock

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Date:   Mon, 10 Feb 2020 10:45:46 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH v2 1/2] dt-bindings: clock: Add binding documentation for TI syscon gate clock

Quoting Vignesh Raghavendra (2020-02-06 20:44:24)
> diff --git a/Documentation/devicetree/bindings/clock/ti,am654-ehrpwm-tbclk.yaml b/Documentation/devicetree/bindings/clock/ti,am654-ehrpwm-tbclk.yaml
> new file mode 100644
> index 000000000000..98fcac2b41f3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/ti,am654-ehrpwm-tbclk.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/ti,am654-ehrpwm-tbclk.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI syscon gate clock driver
> +
> +maintainers:
> +  - Vignesh Raghavendra <vigneshr@...com>
> +
> +description: |
> +
> +  This binding uses common clock bindings
> +  Documentation/devicetree/bindings/clock/clock-bindings.txt

Maybe have a real description instead of this line which is mostly
useless.

> +
> +properties:
> +  compatible:
> +    items:

I think you can drop items.

> +      - const: ti,am654-ehrpwm-tbclk
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  ti,tbclk-syscon:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the system controller node that has bits to
> +      control eHRPWM's TBCLK
> +
> +required:
> +  - compatible
> +  - "#clock-cells"
> +  - ti,tbclk-syscon
> +
> +examples:
> +  - |
> +    tbclk_ctrl: tbclk_ctrl@...0 {
> +        compatible = "syscon";
> +        reg = <0x4140 0x18>;
> +    };
> +
> +    ehrpwm_tbclk: clk0 {
> +        compatible = "ti,am654-ehrpwm-tbclk";
> +        #clock-cells = <1>;
> +        ti,tbclk-syscon = <&tbclk_ctrl>;
> +    };

I don't understand the binding. Why can't the syscon node register clks
and have #clock-cells?