linux-kernel - Re: [PATCH] dt-bindings: clock: Add binding for TI clksel

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Message-ID: <YcIZNfTn37uNbj0F@robh.at.kernel.org>
Date:   Tue, 21 Dec 2021 14:13:09 -0400
From:   Rob Herring <robh@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
        Tero Kristo <kristo@...nel.org>
Subject: Re: [PATCH] dt-bindings: clock: Add binding for TI clksel

On Fri, Dec 17, 2021 at 01:36:40PM +0200, Tony Lindgren wrote:
> In order to prepare for fixing lots of devicetree unique_unit_address
> warnings for the TI clock nodes, let's add a binding for the clksel
> clocks. This allows us to move the overlapping devicetree clocks to be
> children of the related clksel nodes. And then we need the reg property
> only for the parent clksel node.
> 
> We want to set #clock-cells = <1> in case we ever start parsing the clkcsel
> clocks directly using a clksel driver rather than using the existing
> component clock drivers and child nodes. We also need to update the clock
> drivers to get the IO address from the parent clksel node before updating
> the dts files. These will be posted as separate patches.
> 
> Cc: Tero Kristo <kristo@...nel.org>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  .../bindings/clock/ti/ti,clksel.yaml          | 41 +++++++++++++++++++
>  1 file changed, 41 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml b/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml
> new file mode 100644
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml
> @@ -0,0 +1,41 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/ti/ti,clksel.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Binding for TI clksel clock
> +
> +maintainers:
> +  - Tony Lindgren <tony@...mide.com>
> +
> +description: |
> +  The TI CLKSEL clocks consist of consist of a mux, divider, multiplier and
> +  gate bits.
> +
> +properties:
> +  compatible:
> +    const: ti,clksel
> +
> +  reg:
> +    maxItems: 1
> +    description: The CLKSEL register
> +
> +  "#clock-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#clock-cells"
> +
> +additionalProperties: true

Like what properties?

true is only used for common, incomplete schemas referenced by device 
schemas.

> +
> +examples:
> +  - |
> +    clksel_gfx_fclk: clock@52c {
> +      compatible = "ti,clksel";
> +      reg = <0x25c 0x4>;
> +      #clock-cells = <1>;
> +    };
> +...
> -- 
> 2.34.1
>