linux-kernel - Re: [PATCH 1/2] dt-bindings: clock: Add bindings for Renesas ProXO

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Date:   Thu, 22 Sep 2022 11:06:38 -0700
From:   Alex Helms <alexander.helms.jy@...esas.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, sboyd@...nel.org,
        mturquette@...libre.com, geert+renesas@...der.be
Subject: Re: [PATCH 1/2] dt-bindings: clock: Add bindings for Renesas ProXO

On 9/15/2022 5:08 AM, Rob Herring wrote:
> On Wed, Sep 14, 2022 at 02:18:08PM -0700, Alex Helms wrote:
>> Add dt bindings for the Renesas ProXO oscillator.
>>
>> Signed-off-by: Alex Helms <alexander.helms.jy@...esas.com>
>> ---
>>  .../bindings/clock/renesas,proxo.yaml         | 50 +++++++++++++++++++
>>  MAINTAINERS                                   |  5 ++
>>  2 files changed, 55 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/clock/renesas,proxo.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/clock/renesas,proxo.yaml b/Documentation/devicetree/bindings/clock/renesas,proxo.yaml
>> new file mode 100644
>> index 000000000..2ae131431
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/renesas,proxo.yaml
>> @@ -0,0 +1,50 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: https://jpn01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fschemas%2Fclock%2Frenesas%2Cversaclock7.yaml%23&amp;data=05%7C01%7Calexander.helms.jy%40renesas.com%7C34ce960b2542459b61d408da97130b50%7C53d82571da1947e49cb4625a166a4a2a%7C0%7C0%7C637988405289843575%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=izvR%2FXbUNVXknaODSnMmcetPnn%2Ff3Jk%2F6RuBdZ7uSa0%3D&amp;reserved=0
>> +$schema: https://jpn01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23&amp;data=05%7C01%7Calexander.helms.jy%40renesas.com%7C34ce960b2542459b61d408da97130b50%7C53d82571da1947e49cb4625a166a4a2a%7C0%7C0%7C637988405289843575%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=dQ7nZtgfTE5DrXB1iavJuOhSWmGl4tYI1m6iZpkPAhA%3D&amp;reserved=0
>> +
>> +title: Renesas ProXO Oscillator Device Tree Bindings
>> +
>> +maintainers:
>> +  - Alex Helms <alexander.helms.jy@...esas.com>
>> +
>> +description: |
> 
> Don't need '|' if no formatting to preserve.
> 
>> +  Renesas ProXO is a family of programmable ultra-low phase noise 
>> +  quartz-based oscillators.
> 
> Are they all the same from a s/w standpoint. If not you need specific 
> compatibles for the differences. 

At this time only the XP variant is supported and this is reflected in
the "compatible" string.

> 
>> +
>> +properties:
>> +  '#clock-cells':
>> +    const: 0
>> +
>> +  compatible:
>> +    enum:
>> +      - renesas,proxo-xp
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  renesas,xtal:
>> +    description: Internal crystal frequency, default is 50000000 (50MHz)
>> +    $ref: /schemas/types.yaml#/definitions/uint32
> 
> Use 'clock-frequency'.

I think "crystal-frequency" would make more sense. The parts come
programmed to a factory clock frequency which is different than the
internal crystal frequency.

> 
>> +
>> +required:
>> +  - '#clock-cells'
>> +  - compatible
>> +  - reg
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    i2c@0 {
> 
> i2c {
> 
>> +      reg = <0x0 0x100>;
> 
> Drop
> 
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +
>> +      proxo: proxo@55 {
> 
> clock-controller@55
> 
>> +        compatible = "renesas,proxo-xp";
>> +        reg = <0x55>;
>> +        #clock-cells = <0>;
>> +      };
>> +    };
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 350102355..d52a8a5d2 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -16080,6 +16080,11 @@ S:	Supported
>>  F:	Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml
>>  F:	drivers/iio/adc/rzg2l_adc.c
>>  
>> +RENESAS PROXO CLOCK DRIVER
>> +M:	Alex Helms <alexander.helms.jy@...esas.com>
>> +S:	Maintained
>> +F:	Documentation/devicetree/bindings/clock/renesas,proxo.yaml
>> +
>>  RESET CONTROLLER FRAMEWORK
>>  M:	Philipp Zabel <p.zabel@...gutronix.de>
>>  S:	Maintained
>> -- 
>> 2.30.2
>>
>>