lp8727_charger: Support the device tree feature

The interrupt and charging parameters are configurable in the device tree
structure. In the board test, a GPIO is used for handling LP8727
interrupts. The device tree binding documentation is added also.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/power_supply/lp8727_charger.txt b/Documentation/devicetree/bindings/power_supply/lp8727_charger.txt
new file mode 100644
index 000000000000..2246bc5c874b
--- /dev/null
+++ b/Documentation/devicetree/bindings/power_supply/lp8727_charger.txt
@@ -0,0 +1,44 @@
+Binding for TI/National Semiconductor LP8727 Charger
+
+Required properties:
+- compatible: "ti,lp8727"
+- reg: I2C slave address 27h
+
+Optional properties:
+- interrupt-parent: interrupt controller node (see interrupt binding[0])
+- interrupts: interrupt specifier (see interrupt binding[0])
+- debounce-ms: interrupt debounce time. (u32)
+
+AC and USB charging parameters
+- charger-type: "ac" or "usb" (string)
+- eoc-level: value of 'enum lp8727_eoc_level' (u8)
+- charging-current: value of 'enum lp8727_ichg' (u8)
+
+[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+Example)
+
+lp8727@27 {
+        compatible = "ti,lp8727";
+        reg = <0x27>;
+
+        /* GPIO 134 is used for LP8728 interrupt pin */
+        interrupt-parent = <&gpio5>;    /* base = 128 */
+        interrupts = <6 0x2>;           /* offset = 6, falling edge type */
+
+        debounce-ms = <300>;
+
+        /* AC charger: 5% EOC and 500mA charging current */
+        ac {
+                charger-type = "ac";
+                eoc-level = /bits/ 8 <0>;
+                charging-current = /bits/ 8 <4>;
+        };
+
+        /* USB charger: 10% EOC and 400mA charging current */
+        usb {
+                charger-type = "usb";
+                eoc-level = /bits/ 8 <1>;
+                charging-current = /bits/ 8 <2>;
+        };
+};