linux-kernel - Re: [PATCH v2 1/4] dt-bindings: leds: add generic LED consumer documentation

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Message-ID: <20250905153437.GA970284-robh@kernel.org>
Date: Fri, 5 Sep 2025 10:34:37 -0500
From: Rob Herring <robh@...nel.org>
To: Aleksandrs Vinarskis <alex@...arskis.com>
Cc: Hans de Goede <hansg@...nel.org>, Lee Jones <lee@...nel.org>,
	Pavel Machek <pavel@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
	Daniel Thompson <danielt@...nel.org>,
	Jingoo Han <jingoohan1@...il.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
	Jacopo Mondi <jacopo@...ndi.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>, linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Daniel Thompson <daniel.thompson@...aro.org>,
	dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: leds: add generic LED consumer
 documentation

On Fri, Sep 05, 2025 at 10:17:39AM -0500, Rob Herring wrote:
> On Fri, Sep 05, 2025 at 09:59:29AM +0200, Aleksandrs Vinarskis wrote:
> > Introduce common generic led consumer binding, where consumer defines
> > led(s) by phandle, as opposed to trigger-source binding where the
> > trigger source is defined in led itself.
> > 
> > Add already used in some schemas 'leds' parameter which expects
> > phandle-array. Additionally, introduce 'led-names' which could be used
> > by consumers to map LED devices to their respective functions.
> 
> Please update the existing user dropping the type $ref and indicate how 
> many entries (i.e. "maxItems: 1").

Nevermind, I see you did...

> 
> > 
> > Signed-off-by: Aleksandrs Vinarskis <alex@...arskis.com>
> > ---
> >  .../devicetree/bindings/leds/leds-consumer.yaml    | 85 ++++++++++++++++++++++
> >  1 file changed, 85 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/leds/leds-consumer.yaml b/Documentation/devicetree/bindings/leds/leds-consumer.yaml
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..077dbe3ad9ff3fa15236b8dd1f448c00271e4810
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/leds-consumer.yaml
> > @@ -0,0 +1,85 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/leds/leds-consumer.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Common leds consumer
> > +
> > +maintainers:
> > +  - Aleksandrs Vinarskis <alex@...arskis.com>
> > +
> > +description:
> > +  Some LED defined in DT are required by other DT consumers, for example
> > +  v4l2 subnode may require privacy or flash LED. Unlike trigger-source
> > +  approach which is typically used as 'soft' binding, referencing LED
> > +  devices by phandle makes things simpler when 'hard' binding is desired.
> > +
> > +  Document LED properties that its consumers may define.
> > +
> 
> select: true
> 
> 
> > +properties:
> > +  leds:
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +    description:
> > +      A list of LED device(s) required by a particular consumer.
> > +    items:
> > +      maxItems: 1

Also, the select is going to cause a problem with nodes named 'leds', so 
it will need to be:

leds:
  oneOf:
    - type: object
    - $ref: /schemas/types.yaml#/definitions/phandle-array
      ...

> > +
> > +  led-names:
> > +    description:
> > +      A list of device name(s). Used to map LED devices to their respective
> > +      functions, when consumer requires more than one LED.
> > +
> > +additionalProperties: true
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/gpio/gpio.h>
> > +    #include <dt-bindings/leds/common.h>
> > +
> > +    leds {
> > +        compatible = "gpio-leds";
> > +
> > +        privacy_led: privacy-led {
> > +            color = <LED_COLOR_ID_RED>;
> > +            default-state = "off";
> > +            function = LED_FUNCTION_INDICATOR;
> > +            gpios = <&tlmm 110 GPIO_ACTIVE_HIGH>;
> > +        };
> > +    };
> > +
> > +    i2c {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      camera@36 {
> > +        compatible = "ovti,ov02c10";
> > +        reg = <0x36>;
> > +
> > +        reset-gpios = <&tlmm 237 GPIO_ACTIVE_LOW>;
> > +        pinctrl-names = "default";
> > +        pinctrl-0 = <&cam_rgb_default>;
> > +
> > +        led-names = "privacy-led";
> > +        leds = <&privacy_led>;
> > +
> > +        clocks = <&ov02e10_clk>;
> > +
> > +        assigned-clocks = <&ov02e10_clk>;
> > +        assigned-clock-rates = <19200000>;
> > +
> > +        avdd-supply = <&vreg_l7b_2p8>;
> > +        dvdd-supply = <&vreg_l7b_2p8>;
> > +        dovdd-supply = <&vreg_cam_1p8>;
> > +
> > +        port {
> > +          ov02e10_ep: endpoint {
> > +            data-lanes = <1 2>;
> > +            link-frequencies = /bits/ 64 <400000000>;
> > +            remote-endpoint = <&csiphy4_ep>;
> > +          };
> > +        };
> > +      };
> > +    };
> > +
> > +...
> > 
> > -- 
> > 2.48.1
> >