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

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Date:   Mon, 02 Dec 2019 22:32:16 +0100
From:   Michael Walle <michael@...le.cc>
To:     Rob Herring <robh@...nel.org>
Cc:     Wen He <wen.he_1@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        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

Am 2019-12-02 19:47, schrieb Rob Herring:
> 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'.

Ok, fsl,vco-hz sounds good. clock-frequency sounds like it is the 
output.

-michael

>> +     $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
>>