[PATCH 14/22] dt-bindings: power: supply: add AXP20X/AXP22X battery DT binding

[Quentin Schulz]

The X-Powers AXP20X and AXP22X PMICs can have a battery as power supply.

This patch adds the DT binding documentation for the battery power
supply which gets various data from the PMIC, such as the battery status
(charging, discharging, full, dead), current max limit, current current,
battery capacity (in percentage), voltage max and min limits, current
voltage and battery capacity (in Ah).

Signed-off-by: Quentin Schulz <quentin.schulz at free-electrons.com>
---
 .../bindings/power/supply/axp20x_battery.txt       | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/supply/axp20x_battery.txt

diff --git a/Documentation/devicetree/bindings/power/supply/axp20x_battery.txt b/Documentation/devicetree/bindings/power/supply/axp20x_battery.txt
new file mode 100644
index 0000000..5489d0d
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/supply/axp20x_battery.txt
@@ -0,0 +1,27 @@
+AXP20x and AXP22x battery power supply
+
+Required Properties:
+ - compatible, one of:
+			"x-powers,axp209-battery-power-supply"
+			"x-powers,axp221-battery-power-supply"
+ - io-channels: phandles to battery voltage, charge and discharge
+ currents ADC channels
+ - io-channel-names = "batt_v", "batt_chrg_i", "batt_dischrg_i";
+
+This node is a subnode of the axp20x/axp22x PMIC.
+
+The AXP20X and AXP22X can read the battery voltage, charge and discharge
+currents of the battery by reading ADC channels from the AXP20X/AXP22X
+ADC.
+
+Example:
+
+&axp209 {
+	battery_power_supply: battery_power_supply {
+		compatible = "x-powers,axp209-battery-power-supply";
+		io-channels = <&axp209_adc 7>, <&axp209_adc 8>,
+			<&axp209_adc 9>;
+		io-channel-names = "batt_v", "batt_chrg_i",
+			"batt_dischrg_i";
+	}
+};
-- 
2.9.3