leds: lp55xx: add support for Device Tree bindings

This patch allows the lp5521 driver to be successfully probed and
initialised when Device Tree support is enabled.

Based on a patch by Gabriel Fernandez, rewritten in accordance
with review feedback.

Cc: Gabriel Fernandez <gabriel.fernandez@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
new file mode 100644
index 000000000000..348c88eaadfd
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
@@ -0,0 +1,21 @@
+Binding for National Semiconductor LP55xx Led Drivers
+
+Required properties:
+- compatible: "national,lp5521" or "national,lp5523"
+- label: Used for naming LEDs
+- num-channel: Number of LED channels
+- led-cur: Current setting at each led channel (mA x10, 0 if led is not connected)
+- max-cur: Maximun current at each led channel.
+- clock-mode: Input clock mode, (0: automode, 1: internal, 2: external)
+
+example:
+
+lp5521@32 {
+	compatible = "national,lp5521";
+	reg = <0x32>;
+	label = "lp5521_pri";
+	num-channel = /bits/ 8 <3>;
+	led-cur = /bits/ 8 <0x2f 0x2f 0x2f>;
+	max-cur = /bits/ 8 <0x5f 0x5f 0x5f>;
+	clock-mode = /bits/8 <2>;
+};