leds: leds-mc13783: Add devicetree support

This patch adds devicetree support for the MC13XXX LED driver.

(cooloney@gmail.com: remove unneeded semicolon)

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

2 files changed, 140 insertions, 19 deletions

diff --git a/Documentation/devicetree/bindings/mfd/mc13xxx.txt b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
index abd9e3cb2db7..1413f39912d3 100644
--- a/Documentation/devicetree/bindings/mfd/mc13xxx.txt
+++ b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
@@ -10,9 +10,44 @@ Optional properties:
 - fsl,mc13xxx-uses-touch : Indicate the touchscreen controller is being used
 
 Sub-nodes:
+- leds : Contain the led nodes and initial register values in property
+  "led-control". Number of register depends of used IC, for MC13783 is 6,
+  for MC13892 is 4, for MC34708 is 1. See datasheet for bits definitions of
+  these registers.
+  - #address-cells: Must be 1.
+  - #size-cells: Must be 0.
+  Each led node should contain "reg", which used as LED ID (described below).
+  Optional properties "label" and "linux,default-trigger" is described in
+  Documentation/devicetree/bindings/leds/common.txt.
 - regulators : Contain the regulator nodes. The regulators are bound using
   their names as listed below with their registers and bits for enabling.
 
+MC13783 LED IDs:
+    0  : Main display
+    1  : AUX display
+    2  : Keypad
+    3  : Red 1
+    4  : Green 1
+    5  : Blue 1
+    6  : Red 2
+    7  : Green 2
+    8  : Blue 2
+    9  : Red 3
+    10 : Green 3
+    11 : Blue 3
+
+MC13892 LED IDs:
+    0  : Main display
+    1  : AUX display
+    2  : Keypad
+    3  : Red
+    4  : Green
+    5  : Blue
+
+MC34708 LED IDs:
+    0  : Charger Red
+    1  : Charger Green
+
 MC13783 regulators:
     sw1a      : regulator SW1A      (register 24, bit 0)
     sw1b      : regulator SW1B      (register 25, bit 0)
@@ -89,6 +124,18 @@ ecspi@70010000 { /* ECSPI1 */
                 interrupt-parent = <&gpio0>;
                 interrupts = <8>;
 
+                leds {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        led-control = <0x000 0x000 0x0e0 0x000>;
+
+                        sysled {
+                                reg = <3>;
+                                label = "system:red:live";
+                                linux,default-trigger = "heartbeat";
+                        };
+                };
+
                 regulators {
                         sw1_reg: mc13892__sw1 {
                                 regulator-min-microvolt = <600000>;
diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c
index 15fa5e86abcf..021adc11162e 100644
--- a/drivers/leds/leds-mc13783.c
+++ b/drivers/leds/leds-mc13783.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/leds.h>
+#include <linux/of.h>
 #include <linux/workqueue.h>
 #include <linux/mfd/mc13xxx.h>
 
@@ -42,7 +43,7 @@ struct mc13xxx_leds {
         struct mc13xxx                  *master;
         struct mc13xxx_led_devtype      *devtype;
         int                             num_leds;
-        struct mc13xxx_led              led[0];
+        struct mc13xxx_led              *led;
 };
 
 static unsigned int mc13xxx_max_brightness(int id)
@@ -120,6 +121,74 @@ static void mc13xxx_led_set(struct led_classdev *led_cdev,
         schedule_work(&led->work);
 }
 
+#ifdef CONFIG_OF
+static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+        struct platform_device *pdev)
+{
+        struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
+        struct mc13xxx_leds_platform_data *pdata;
+        struct device_node *parent, *child;
+        struct device *dev = &pdev->dev;
+        int i = 0, ret = -ENODATA;
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return ERR_PTR(-ENOMEM);
+
+        of_node_get(dev->parent->of_node);
+
+        parent = of_find_node_by_name(dev->parent->of_node, "leds");
+        if (!parent)
+                goto out_node_put;
+
+        ret = of_property_read_u32_array(parent, "led-control",
+                                         pdata->led_control,
+                                         leds->devtype->num_regs);
+        if (ret)
+                goto out_node_put;
+
+        pdata->num_leds = of_get_child_count(parent);
+
+        pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
+                                  GFP_KERNEL);
+        if (!pdata->led) {
+                ret = -ENOMEM;
+                goto out_node_put;
+        }
+
+        for_each_child_of_node(parent, child) {
+                const char *str;
+                u32 tmp;
+
+                if (of_property_read_u32(child, "reg", &tmp))
+                        continue;
+                pdata->led[i].id = leds->devtype->led_min + tmp;
+
+                if (!of_property_read_string(child, "label", &str))
+                        pdata->led[i].name = str;
+                if (!of_property_read_string(child, "linux,default-trigger",
+                                             &str))
+                        pdata->led[i].default_trigger = str;
+
+                i++;
+        }
+
+        pdata->num_leds = i;
+        ret = i > 0 ? 0 : -ENODATA;
+
+out_node_put:
+        of_node_put(parent);
+
+        return ret ? ERR_PTR(ret) : pdata;
+}
+#else
+static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+        struct platform_device *pdev)
+{
+        return ERR_PTR(-ENOSYS);
+}
+#endif
+
 static int __init mc13xxx_led_probe(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
@@ -128,32 +197,37 @@ static int __init mc13xxx_led_probe(struct platform_device *pdev)
         struct mc13xxx_led_devtype *devtype =
                 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
         struct mc13xxx_leds *leds;
-        int i, id, num_leds, ret = -ENODATA;
+        int i, id, ret = -ENODATA;
         u32 init_led = 0;
 
-        if (!pdata) {
-                dev_err(dev, "Missing platform data\n");
-                return -ENODEV;
-        }
-
-        num_leds = pdata->num_leds;
-
-        if ((num_leds < 1) ||
-            (num_leds > (devtype->led_max - devtype->led_min + 1))) {
-                dev_err(dev, "Invalid LED count %d\n", num_leds);
-                return -EINVAL;
-        }
-
-        leds = devm_kzalloc(dev, num_leds * sizeof(struct mc13xxx_led) +
-                            sizeof(struct mc13xxx_leds), GFP_KERNEL);
+        leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
         if (!leds)
                 return -ENOMEM;
 
         leds->devtype = devtype;
-        leds->num_leds = num_leds;
         leds->master = mcdev;
         platform_set_drvdata(pdev, leds);
 
+        if (dev->parent->of_node) {
+                pdata = mc13xxx_led_probe_dt(pdev);
+                if (IS_ERR(pdata))
+                        return PTR_ERR(pdata);
+        } else if (!pdata)
+                return -ENODATA;
+
+        leds->num_leds = pdata->num_leds;
+
+        if ((leds->num_leds < 1) ||
+            (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
+                dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
+                return -EINVAL;
+        }
+
+        leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
+                                 GFP_KERNEL);
+        if (!leds->led)
+                return -ENOMEM;
+
         for (i = 0; i < devtype->num_regs; i++) {
                 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
                                         pdata->led_control[i]);
@@ -161,7 +235,7 @@ static int __init mc13xxx_led_probe(struct platform_device *pdev)
                         return ret;
         }
 
-        for (i = 0; i < num_leds; i++) {
+        for (i = 0; i < leds->num_leds; i++) {
                 const char *name, *trig;
 
                 ret = -EINVAL;