linux-kernel - Re: [PATCH v3 2/3] dt-bindings: pwm: Document clk based PWM controller

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Date:   Fri, 21 Jan 2022 16:34:03 -0500
From:   Sean Anderson <sean.anderson@...o.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Nikita Travkin <nikita@...n.ru>
Cc:     thierry.reding@...il.com, lee.jones@...aro.org,
        u.kleine-koenig@...gutronix.de, robh+dt@...nel.org,
        sboyd@...nel.org, linus.walleij@...aro.org, masneyb@...tation.org,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v3 2/3] dt-bindings: pwm: Document clk based PWM
 controller



On 1/21/22 2:34 AM, Krzysztof Kozlowski wrote:
> On Thu, 20 Jan 2022 at 17:15, Nikita Travkin <nikita@...n.ru> wrote:
>>
>> Add YAML devicetree binding for clk based PWM controller
>>
>> Signed-off-by: Nikita Travkin <nikita@...n.ru>
>> --
>> Changes in v2:
>>  - fix the file name.
>> ---
>>  .../devicetree/bindings/pwm/clk-pwm.yaml      | 45 +++++++++++++++++++
>>  1 file changed, 45 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/pwm/clk-pwm.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/pwm/clk-pwm.yaml b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
>> new file mode 100644
>> index 000000000000..4fb2c1baaad4
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
>> @@ -0,0 +1,45 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/pwm/clk-pwm.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Clock based PWM controller
>> +
>> +maintainers:
>> +  - Nikita Travkin <nikita@...n.ru>
>> +
>> +description: |
>> +  Some systems have clocks that can be exposed to external devices.
>> +  (e.g. by muxing them to GPIO pins)
>> +  It's often possible to control duty-cycle of such clocks which makes them
>> +  suitable for generating PWM signal.
>> +
>> +allOf:
>> +  - $ref: pwm.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: clk-pwm
>> +
>> +  clocks:
>> +    description: Clock used to generate the signal.
>> +    maxItems: 1
>> +
>> +  "#pwm-cells":
>> +    const: 2
>> +
>> +unevaluatedProperties: false
>> +
>> +required:
>> +  - clocks
>> +
>> +examples:
>> +  - |
>> +    pwm-flash {
> 
> Node names should be generic (see devicetree specification), so just "pwm".

And then what will you do if you have two clock-based pwms?

--Sean