dt-bindings: leds: qcom-lpg: Explain standalone PWM usage

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@oss.qualcomm.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://patch.msgid.link/20251119-lpg_triled_fix-v3-1-84b6dbdc774a@oss.qualcomm.com
Signed-off-by: Lee Jones <lee@kernel.org>

diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
index 841a0229c472a4764426d25d9dbb900adc20fc11..c4b7e57b251845a6970b34bc9ae0c00647b1bf96 100644 (file)
--- 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: