linux-kernel - Re: [v10 1/2] dt/bindings: clk: Add YAML schemas for LS1028A Display Clock bindings

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Message-ID: <20191202184758.GA8408@bogus>
Date:   Mon, 2 Dec 2019 12:47:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Wen He <wen.he_1@....com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Walle <michael@...le.cc>, Li Yang <leoyang.li@....com>,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v10 1/2] dt/bindings: clk: Add YAML schemas for LS1028A Display
 Clock bindings

On Wed, Nov 27, 2019 at 06:15:24PM +0800, Wen He wrote:
> LS1028A has a clock domain PXLCLK0 used for provide pixel clocks to Display
> output interface. Add a YAML schema for this.
> 
> Signed-off-by: Wen He <wen.he_1@....com>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> change in v10:
>         - Add optional feild 'vco-frequency'.
> 
>  .../devicetree/bindings/clock/fsl,plldig.yaml | 54 +++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/fsl,plldig.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/fsl,plldig.yaml b/Documentation/devicetree/bindings/clock/fsl,plldig.yaml
> new file mode 100644
> index 000000000000..ee5b5c61a471
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/fsl,plldig.yaml
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bindings/clock/fsl,plldig.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP QorIQ Layerscape LS1028A Display PIXEL Clock Binding
> +
> +maintainers:
> +  - Wen He <wen.he_1@....com>
> +
> +description: |
> +  NXP LS1028A has a clock domain PXLCLK0 used for the Display output
> +  interface in the display core, as implemented in TSMC CLN28HPM PLL.
> +  which generate and offers pixel clocks to Display.
> +
> +properties:
> +  compatible:
> +    const: fsl,ls1028a-plldig
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#clock-cells':
> +    const: 0
> +
> +  vco-frequency:

Needs vendor prefix and unit suffix:

fsl,vco-hz

Or you could perhaps just use 'clock-frequency'.

> +     $ref: '/schemas/types.yaml#/definitions/uint32'
> +     description: Optional for VCO frequency of the PLL in Hertz.
> +        The VCO frequency of this PLL cannot be changed during runtime
> +        only at startup. Therefore, the output frequencies are very
> +        limited and might not even closely match the requested frequency.
> +        To work around this restriction the user may specify its own
> +        desired VCO frequency for the PLL. The frequency has to be in the
> +        range of 650000000 to 1300000000.
> +        If not set, the default frequency is 1188000000.

A bunch of constraints you've listed here that should be schema rather 
than freeform text:

minimum: 650000000
maximum: 1300000000
default: 1188000000

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - '#clock-cells'
> +
> +examples:
> +  # Display PIXEL Clock node:
> +  - |
> +    dpclk: clock-display@...0000 {
> +        compatible = "fsl,ls1028a-plldig";
> +        reg = <0x0 0xf1f0000 0x0 0xffff>;
> +        #clock-cells = <0>;
> +        clocks = <&osc_27m>;
> +    };
> +
> +...
> -- 
> 2.17.1
>