[PATCH] dt-bindings: power: supply: sc27xx-fg: add low voltage alarm IRQ

[Stanislav Jakubek <stano.jakubek@gmail.com>]

The SC27XX fuel gauge supports a low voltage alarm IRQ, which is used
for more accurate battery capacity measurements with lower voltages.

This was unfortunately never documented in bindings, do so now.

Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
---
Initial Linux driver submission adding this feature:
https://lore.kernel.org/lkml/ee1dd39f126bd03fb88381de9663d32df994d341.1542185618.git.baolin.wang@linaro.org/

The only in-tree user (sc2731.dtsi) has had interrupts specified since its
initial fuel-gauge submission:
https://lore.kernel.org/lkml/4f66af3b47ba241380f8092e08879aca6d7c35b3.1548052878.git.baolin.wang@linaro.org/

 .../devicetree/bindings/power/supply/sc27xx-fg.yaml         | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.yaml b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.yaml
index de43e45a43b7..9108a2841caf 100644
--- a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.yaml
+++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.yaml
@@ -27,6 +27,9 @@ properties:
   battery-detect-gpios:
     maxItems: 1
 
+  interrupts:
+    maxItems: 1
+
   io-channels:
     items:
       - description: Battery Temperature ADC
@@ -53,6 +56,7 @@ required:
   - compatible
   - reg
   - battery-detect-gpios
+  - interrupts
   - io-channels
   - io-channel-names
   - nvmem-cells
@@ -88,6 +92,8 @@ examples:
         compatible = "sprd,sc2731-fgu";
         reg = <0xa00>;
         battery-detect-gpios = <&pmic_eic 9 GPIO_ACTIVE_HIGH>;
+        interrupt-parent = <&sc2731_pmic>;
+        interrupts = <4>;
         io-channels = <&pmic_adc 5>, <&pmic_adc 14>;
         io-channel-names = "bat-temp", "charge-vol";
         nvmem-cells = <&fgu_calib>;
-- 
2.34.1