[PATCH v5 3/5] dt-bindings: leds: leds-is31fl32xx: Add powerdown-gpios property

[Jun Yan]

The IS31FL32XX series features an SDB shutdown pin.
Driving it low (active low) places the chip into hardware shutdown mode
for power saving, while all register contents are preserved
and registers are not reset.

Add powerdown-gpios property to describe the GPIO connected to the
SDB pin of IS31FL32XX series LED controllers.

Signed-off-by: Jun Yan <jerrysteve1101@xxxxxxxxx>
Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>
---
 .../devicetree/bindings/leds/issl,is31fl32xx.yaml    | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/issl,is31fl32xx.yaml b/Documentation/devicetree/bindings/leds/issl,is31fl32xx.yaml
index a8ed62fd2f35..1763d3a17168 100644
--- a/Documentation/devicetree/bindings/leds/issl,is31fl32xx.yaml
+++ b/Documentation/devicetree/bindings/leds/issl,is31fl32xx.yaml
@@ -45,6 +45,15 @@ properties:
       When present, the chip's PWM will operate at ~22kHz as opposed
       to ~3kHz to move the operating frequency out of the audible range.
 
+  powerdown-gpios:
+    maxItems: 1
+    description:
+      GPIO connected to the chip's SDB pin.
+      Driving this GPIO low places the chip into hardware shutdown mode
+      for power saving. All register contents are preserved and registers
+      are not reset during shutdown. The chip exits hardware shutdown mode
+      when the SDB pin is pulled high.
+
   "#address-cells":
     const: 1
 
@@ -145,6 +154,7 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/gpio/gpio.h>
     #include <dt-bindings/leds/common.h>
 
     i2c {
@@ -157,6 +167,8 @@ examples:
             #address-cells = <1>;
             #size-cells = <0>;
 
+            powerdown-gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
+
             led@1 {
                 reg = <1>;
                 color = <LED_COLOR_ID_RED>;
-- 
2.53.0