Subject: Re: [PATCH v7 02/12] dt-bindings: leds: Convert pwm to yaml

From: Russell King - ARM Linux admin <[email-masked]>
Date: Thu, 29 Oct 2020 13:46:30 +0000

On Wed, Oct 28, 2020 at 09:39:54PM +0100, Alexander Dahl wrote:
> Hello,
> 
> Peter, Russel, could you please give your Acked-by or Signed-off-by on
> this patch?  Your ack is needed, because the license is now explicitly
> set (it was not explicit before), and you were the contributors to
> this binding before the conversion to yaml.

For the license change only:

Acked-by: Russell King <[email-masked]>

(Please drop the Cc attributation in the commit to
[email-masked] thanks.)

> 
> Thanks and Greets
> Alex
> 
> On Mon, Oct 05, 2020 at 10:34:41PM +0200, Alexander Dahl wrote:
> > The example was adapted in the following ways:
> > 
> > - make use of the now supported 'function' and 'color' properties
> > - remove pwm nodes, those are documented elsewhere
> > - align node names to new dt schema rules and dt recommendations
> > 
> > License was not explicitly set before.  The license set now is
> > recommended by DT project.
> > 
> > Suggested-by: Jacek Anaszewski <[email-masked]>
> > Signed-off-by: Alexander Dahl <[email-masked]>
> > Reviewed-by: Krzysztof Kozlowski <[email-masked]>
> > Reviewed-by: Rob Herring <[email-masked]>
> > Cc: Peter Ujfalusi <[email-masked]>
> > Cc: Russell King <[email-masked]>
> > ---
> > 
> > Notes:
> >     NOTE: Due to license set/change this needs Acked-by or Signed-off-by from:
> >       * Peter Ujfalusi
> >       * Russell King
> >     
> >     That was discussed already with Peter (original author), still waiting
> >     for Acked-by though …
> >     
> >     Changelog
> >     ---------
> >     v6 -> v7:
> >       * added Reviewed-by (Krzysztof Kozlowski)
> >       * reworded commit message (suggested by Krzysztof)
> >       * added Reviewed-by (Rob Herring)
> >     
> >     v5 -> v6:
> >       * removed pwm nodes from example (Rob)
> >       * renamed led-controller node in example (Rob)
> >     
> >     v4 -> v5:
> >       * updated based on feedback by Rob Herring
> >       * removed Acked-by
> >     
> >     v3 -> v4:
> >       * added Cc to original author of the binding
> >     
> >     v2 -> v3:
> >       * changed license identifier to recommended one
> >       * added Acked-by
> >     
> >     v2:
> >       * added this patch to series (Suggested-by: Jacek Anaszewski)
> > 
> >  .../devicetree/bindings/leds/leds-pwm.txt     | 50 -------------
> >  .../devicetree/bindings/leds/leds-pwm.yaml    | 70 +++++++++++++++++++
> >  2 files changed, 70 insertions(+), 50 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/leds/leds-pwm.txt
> >  create mode 100644 Documentation/devicetree/bindings/leds/leds-pwm.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/leds/leds-pwm.txt b/Documentation/devicetree/bindings/leds/leds-pwm.txt
> > deleted file mode 100644
> > index 6c6583c35f2f..000000000000
> > --- a/Documentation/devicetree/bindings/leds/leds-pwm.txt
> > +++ /dev/null
> > @@ -1,50 +0,0 @@
> > -LED connected to PWM
> > -
> > -Required properties:
> > -- compatible : should be "pwm-leds".
> > -
> > -Each LED is represented as a sub-node of the pwm-leds device.  Each
> > -node's name represents the name of the corresponding LED.
> > -
> > -LED sub-node properties:
> > -- pwms : PWM property to point to the PWM device (phandle)/port (id) and to
> > -  specify the period time to be used: <&phandle id period_ns>;
> > -- pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device
> > -  For the pwms and pwm-names property please refer to:
> > -  Documentation/devicetree/bindings/pwm/pwm.txt
> > -- max-brightness : Maximum brightness possible for the LED
> > -- active-low : (optional) For PWMs where the LED is wired to supply
> > -  rather than ground.
> > -- label :  (optional)
> > -  see Documentation/devicetree/bindings/leds/common.txt
> > -- linux,default-trigger :  (optional)
> > -  see Documentation/devicetree/bindings/leds/common.txt
> > -
> > -Example:
> > -
> > -twl_pwm: pwm {
> > -	/* provides two PWMs (id 0, 1 for PWM1 and PWM2) */
> > -	compatible = "ti,twl6030-pwm";
> > -	#pwm-cells = <2>;
> > -};
> > -
> > -twl_pwmled: pwmled {
> > -	/* provides one PWM (id 0 for Charing indicator LED) */
> > -	compatible = "ti,twl6030-pwmled";
> > -	#pwm-cells = <2>;
> > -};
> > -
> > -pwmleds {
> > -	compatible = "pwm-leds";
> > -	kpad {
> > -		label = "omap4::keypad";
> > -		pwms = <&twl_pwm 0 7812500>;
> > -		max-brightness = <127>;
> > -	};
> > -
> > -	charging {
> > -		label = "omap4:green:chrg";
> > -		pwms = <&twl_pwmled 0 7812500>;
> > -		max-brightness = <255>;
> > -	};
> > -};
> > diff --git a/Documentation/devicetree/bindings/leds/leds-pwm.yaml b/Documentation/devicetree/bindings/leds/leds-pwm.yaml
> > new file mode 100644
> > index 000000000000..fe4d5fd25913
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/leds-pwm.yaml
> > @@ -0,0 +1,70 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/leds/leds-pwm.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: LEDs connected to PWM
> > +
> > +maintainers:
> > +  - Pavel Machek <[email-masked]>
> > +
> > +description:
> > +  Each LED is represented as a sub-node of the pwm-leds device.  Each
> > +  node's name represents the name of the corresponding LED.
> > +
> > +properties:
> > +  compatible:
> > +    const: pwm-leds
> > +
> > +patternProperties:
> > +  "^led(-[0-9a-f]+)?$":
> > +    type: object
> > +
> > +    $ref: common.yaml#
> > +
> > +    properties:
> > +      pwms:
> > +        maxItems: 1
> > +
> > +      pwm-names: true
> > +
> > +      max-brightness:
> > +        description:
> > +          Maximum brightness possible for the LED
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +
> > +      active-low:
> > +        description:
> > +          For PWMs where the LED is wired to supply rather than ground.
> > +        type: boolean
> > +
> > +    required:
> > +      - pwms
> > +      - max-brightness
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +
> > +    #include <dt-bindings/leds/common.h>
> > +
> > +    led-controller {
> > +        compatible = "pwm-leds";
> > +
> > +        led-1 {
> > +            label = "omap4::keypad";
> > +            pwms = <&twl_pwm 0 7812500>;
> > +            max-brightness = <127>;
> > +        };
> > +
> > +        led-2 {
> > +            color = <LED_COLOR_ID_GREEN>;
> > +            function = LED_FUNCTION_CHARGING;
> > +            pwms = <&twl_pwmled 0 7812500>;
> > +            max-brightness = <255>;
> > +        };
> > +    };
> > +
> > +...
> > -- 
> > 2.20.1
> 
> -- 
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> \ / CAMPAIGN     | speech censured, the first thought forbidden, the
>  X  AGAINST      | first freedom denied, chains us all irrevocably.«
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