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

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Message-Id: <20251119-lpg_triled_fix-v3-1-84b6dbdc774a@oss.qualcomm.com>
Date: Wed, 19 Nov 2025 14:06:42 +0800
From: Fenglin Wu via B4 Relay <devnull+fenglin.wu.oss.qualcomm.com@...nel.org>
To: kernel@....qualcomm.com, Lee Jones <lee@...nel.org>, 
 Pavel Machek <pavel@...nel.org>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 Bjorn Andersson <andersson@...nel.org>, linux-arm-msm@...r.kernel.org, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Subbaraman Narayanamurthy <subbaraman.narayanamurthy@....qualcomm.com>, 
 Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Fenglin Wu <fenglin.wu@....qualcomm.com>
Subject: [PATCH v3 1/2] dt-bindings: leds: qcom-lpg: Explain standalone PWM
 usage

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.

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