linux-kernel - Re: [PATCH v3 1/2] dt-bindings: leds: qcom-lpg: Explain standalone PWM usage

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Message-ID: <t5r7z435dui7aqiazyomnuswi2c4pud2q4xyayntqybg7medgd@whhdkulnbjcu>
Date: Wed, 19 Nov 2025 15:51:53 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: fenglin.wu@....qualcomm.com
Cc: kernel@....qualcomm.com, Lee Jones <lee@...nel.org>, 
	Pavel Machek <pavel@...nel.org>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	linux-arm-msm@...r.kernel.org, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Subbaraman Narayanamurthy <subbaraman.narayanamurthy@....qualcomm.com>, Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: leds: qcom-lpg: Explain standalone
 PWM usage

On Wed, Nov 19, 2025 at 02:06:42PM +0800, Fenglin Wu via B4 Relay wrote:
> From: Fenglin Wu <fenglin.wu@....qualcomm.com>
> 
> LPG channels can be used for only outputting PWM signals by routing to
> PMIC GPIOs without enabling TRILED. Explain this usage in the description
> for better clarity.
> 

Reviewed-by: Bjorn Andersson <andersson@...nel.org>

> Signed-off-by: Fenglin Wu <fenglin.wu@....qualcomm.com>
> ---
>  Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> index 841a0229c472a4764426d25d9dbb900adc20fc11..c4b7e57b251845a6970b34bc9ae0c00647b1bf96 100644
> --- a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> @@ -13,6 +13,11 @@ description: >
>    The Qualcomm Light Pulse Generator consists of three different hardware blocks;
>    a ramp generator with lookup table (LUT), the light pulse generator and a three
>    channel current sink. These blocks are found in a wide range of Qualcomm PMICs.
> +  The light pulse generator (LPG) can also be used independently to output PWM
> +  signal for standard PWM applications. In this scenario, the LPG output should
> +  be routed to a specific PMIC GPIO by setting the GPIO pin mux to the special
> +  functions indicated in the datasheet, the TRILED driver for the channel will
> +  not be enabled in this configuration.
>  
>  properties:
>    compatible:
> 
> -- 
> 2.34.1
> 
>