leds: lp5562: support the device tree feature

The LP55xx DT structure is applicable to the LP5562 device.
The driver and documentation are updated.

Compatible property of the DT
: LP5521 and LP5223 were manufactured by National Semiconductor.
  LP5562 is a new device from Texas Instruments.

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

2 files changed, 49 insertions, 7 deletions

diff --git a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
index 1ed6bb0ce777..d5176882d8b9 100644
--- a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
+++ b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
@@ -1,7 +1,7 @@
-Binding for National Semiconductor LP55xx Led Drivers
+Binding for TI/National Semiconductor LP55xx Led Drivers
 
 Required properties:
-- compatible: "national,lp5521" or "national,lp5523"
+- compatible: "national,lp5521" or "national,lp5523" or "ti,lp5562"
 - reg: I2C slave address
 - clock-mode: Input clock mode, (0: automode, 1: internal, 2: external)
 
@@ -112,3 +112,36 @@ lp5523@32 {
                 max-cur = /bits/ 8 <0x20>;
         };
 };
+
+example 3) LP5562
+4 channels are defined.
+
+lp5562@30 {
+        compatible = "ti,lp5562";
+        reg = <0x30>;
+        clock-mode = /bits/8 <2>;
+
+        chan0 {
+                chan-name = "R";
+                led-cur = /bits/ 8 <0x20>;
+                max-cur = /bits/ 8 <0x60>;
+        };
+
+        chan1 {
+                chan-name = "G";
+                led-cur = /bits/ 8 <0x20>;
+                max-cur = /bits/ 8 <0x60>;
+        };
+
+        chan2 {
+                chan-name = "B";
+                led-cur = /bits/ 8 <0x20>;
+                max-cur = /bits/ 8 <0x60>;
+        };
+
+        chan3 {
+                chan-name = "W";
+                led-cur = /bits/ 8 <0x20>;
+                max-cur = /bits/ 8 <0x60>;
+        };
+};
diff --git a/drivers/leds/leds-lp5562.c b/drivers/leds/leds-lp5562.c
index 513f2390ca2d..e53bcb89a978 100644
--- a/drivers/leds/leds-lp5562.c
+++ b/drivers/leds/leds-lp5562.c
@@ -515,12 +515,20 @@ static int lp5562_probe(struct i2c_client *client,
         int ret;
         struct lp55xx_chip *chip;
         struct lp55xx_led *led;
-        struct lp55xx_platform_data *pdata = client->dev.platform_data;
-
-        if (!pdata) {
-                dev_err(&client->dev, "no platform data\n");
-                return -EINVAL;
+        struct lp55xx_platform_data *pdata;
+        struct device_node *np = client->dev.of_node;
+
+        if (!client->dev.platform_data) {
+                if (np) {
+                        ret = lp55xx_of_populate_pdata(&client->dev, np);
+                        if (ret < 0)
+                                return ret;
+                } else {
+                        dev_err(&client->dev, "no platform data\n");
+                        return -EINVAL;
+                }
         }
+        pdata = client->dev.platform_data;
 
         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
         if (!chip)
@@ -579,6 +587,7 @@ static int lp5562_remove(struct i2c_client *client)
 
 static const struct i2c_device_id lp5562_id[] = {
         { "lp5562", 0 },
+        { "ti,lp5562", 0 }, /* OF compatible */
         { }
 };
 MODULE_DEVICE_TABLE(i2c, lp5562_id);