linux-kernel - Re: [PATCH v2 02/12] dt-bindings: leds: document Samsung S2M series PMIC RGB LED device

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Message-Id: <DG7XO4R0QY9W.13JQE6RFCSY5N@disroot.org>
Date: Fri, 06 Feb 2026 19:33:12 +0530
From: "Kaustabh Chakraborty" <kauschluss@...root.org>
To: "Kaustabh Chakraborty" <kauschluss@...root.org>, "Rob Herring"
 <robh@...nel.org>
Cc: "Lee Jones" <lee@...nel.org>, "Pavel Machek" <pavel@...nel.org>,
 "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor Dooley"
 <conor+dt@...nel.org>, "MyungJoo Ham" <myungjoo.ham@...sung.com>, "Chanwoo
 Choi" <cw00.choi@...sung.com>, "Sebastian Reichel" <sre@...nel.org>,
 "Krzysztof Kozlowski" <krzk@...nel.org>, André Draszik
 <andre.draszik@...aro.org>, "Alexandre Belloni"
 <alexandre.belloni@...tlin.com>, "Jonathan Corbet" <corbet@....net>, "Shuah
 Khan" <skhan@...uxfoundation.org>, <linux-leds@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-pm@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
 <linux-rtc@...r.kernel.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 02/12] dt-bindings: leds: document Samsung S2M series
 PMIC RGB LED device

On 2026-02-06 19:26 +05:30, Kaustabh Chakraborty wrote:
> On 2026-02-06 07:38 -06:00, Rob Herring wrote:
>> On Mon, Jan 26, 2026 at 12:37:09AM +0530, Kaustabh Chakraborty wrote:
>>> Certain Samsung S2M series PMICs have a three-channel LED device with
>>> independent brightness control for each channel, typically used as
>>> status indicators in mobile phones. Document the devicetree schema from
>>> this device.
>>> 
>>> Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
>>> ---
>>>  .../bindings/leds/samsung,s2mu005-rgb.yaml         | 34 ++++++++++++++++++++++
>>>  1 file changed, 34 insertions(+)
>>> 
>>> diff --git a/Documentation/devicetree/bindings/leds/samsung,s2mu005-rgb.yaml b/Documentation/devicetree/bindings/leds/samsung,s2mu005-rgb.yaml
>>> new file mode 100644
>>> index 0000000000000..6806b6d869ff7
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/leds/samsung,s2mu005-rgb.yaml
>>> @@ -0,0 +1,34 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/leds/samsung,s2mu005-rgb.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: RGB LED Controller for Samsung S2M series PMICs
>>> +
>>> +maintainers:
>>> +  - Kaustabh Chakraborty <kauschluss@...root.org>
>>> +
>>> +description: |
>>> +  The Samsung S2M series PMIC RGB LED is a three-channel LED device with
>>> +  8-bit brightness control for each channel, typically used as status
>>> +  indicators in mobile phones.
>>> +
>>> +  This is a part of device tree bindings for S2M and S5M family of Power
>>> +  Management IC (PMIC).
>>> +
>>> +  See also Documentation/devicetree/bindings/mfd/samsung,s2mps11.yaml for
>>> +  additional information and example.
>>> +
>>> +allOf:
>>> +  - $ref: common.yaml#
>>
>> This looks a bit lacking. Don't you need 3 child nodes for each or 
>> reference to the multi-color schema?
>
> 	rgb {
> 		compatible = "samsung,s2mu005-rgb";
> 		label = "notification:rgb:indicator";
> 		color = <LED_COLOR_ID_RGB>;
> 		function = LED_FUNCTION_INDICATOR;
> 		linux,default-trigger = "pattern";
> 	};
>

Message got deleted somehow? Anyways, the device has three channels but
a single LED, but is controlled by a single driver interface only. The
channels are not independent.

>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - samsung,s2mu005-rgb
>>> +
>>> +required:
>>> +  - compatible
>>> +
>>> +unevaluatedProperties: false
>>> 
>>> -- 
>>> 2.52.0
>>>