leds: Add device tree binding for pca9633

Similar to tca6507, we can just parse the standard LED
properties for pca9633.

Tested on a pca9632, which is compatible with pca9633.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

diff --git a/Documentation/devicetree/bindings/leds/pca9633.txt b/Documentation/devicetree/bindings/leds/pca9633.txt
new file mode 100644 (file)
index 0000000..8140512
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/pca9633.txt
@@ -0,0 +1,45 @@
+LEDs connected to pca9633 or pca9632
+
+Required properties:
+- compatible : should be : "nxp,pca963x"
+
+Optional properties:
+- nxp,totem-pole : use totem pole (push-pull) instead of default open-drain
+
+Each led is represented as a sub-node of the nxp,pca9633 device.
+
+LED sub-node properties:
+- label : (optional) see Documentation/devicetree/bindings/leds/common.txt
+- reg : number of LED line (could be from 0 to 4)
+- linux,default-trigger : (optional)
+   see Documentation/devicetree/bindings/leds/common.txt
+
+Examples:
+
+pca9632: pca9632 {
+       compatible = "nxp,pca9632", "nxp,pca963x";
+       #address-cells = <1>;
+       #size-cells = <0>;
+       reg = <0x62>;
+
+       red@0 {
+               label = "red";
+               reg = <0>;
+               linux,default-trigger = "none";
+       };
+       green@1 {
+               label = "green";
+               reg = <1>;
+               linux,default-trigger = "none";
+       };
+       blue@2 {
+               label = "blue";
+               reg = <2>;
+               linux,default-trigger = "none";
+       };
+       unused@3 {
+               label = "unused";
+               reg = <3>;
+               linux,default-trigger = "none";
+       };
+};

diff --git a/drivers/leds/leds-pca9633.c b/drivers/leds/leds-pca9633.c
index 9aae5679ffb225e8ff48b60ea8875802785c0436..90935e465c4d0b2c98a31cb14ddbe9536a39b1d0 100644 (file)
--- a/drivers/leds/leds-pca9633.c
+++ b/drivers/leds/leds-pca9633.c
@@ -22,6 +22,7 @@
 #include <linux/i2c.h>
 #include <linux/workqueue.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 #include <linux/platform_data/leds-pca9633.h>
 
 /* LED select registers determine the source that drives LED outputs */
@@ -93,6 +94,67 @@ static void pca9633_led_set(struct led_classdev *led_cdev,
        schedule_work(&pca9633->work);
 }
 
+#if IS_ENABLED(CONFIG_OF)
+static struct pca9633_platform_data *
+pca9633_dt_init(struct i2c_client *client)
+{
+       struct device_node *np = client->dev.of_node, *child;
+       struct pca9633_platform_data *pdata;
+       struct led_info *pca9633_leds;
+       int count;
+
+       count = of_get_child_count(np);
+       if (!count || count > 4)
+               return ERR_PTR(-ENODEV);
+
+       pca9633_leds = devm_kzalloc(&client->dev,
+                               sizeof(struct led_info) * count, GFP_KERNEL);
+       if (!pca9633_leds)
+               return ERR_PTR(-ENOMEM);
+
+       for_each_child_of_node(np, child) {
+               struct led_info led;
+               u32 reg;
+               int res;
+
+               led.name =
+                       of_get_property(child, "label", NULL) ? : child->name;
+               led.default_trigger =
+                       of_get_property(child, "linux,default-trigger", NULL);
+               res = of_property_read_u32(child, "reg", &reg);
+               if (res != 0)
+                       continue;
+               pca9633_leds[reg] = led;
+       }
+       pdata = devm_kzalloc(&client->dev,
+                            sizeof(struct pca9633_platform_data), GFP_KERNEL);
+       if (!pdata)
+               return ERR_PTR(-ENOMEM);
+
+       pdata->leds.leds = pca9633_leds;
+       pdata->leds.num_leds = count;
+
+       /* default to open-drain unless totem pole (push-pull) is specified */
+       if (of_property_read_bool(np, "nxp,totem-pole"))
+               pdata->outdrv = PCA9633_TOTEM_POLE;
+       else
+               pdata->outdrv = PCA9633_OPEN_DRAIN;
+
+       return pdata;
+}
+
+static const struct of_device_id of_pca9633_match[] = {
+       { .compatible = "nxp,pca963x", },
+       {},
+};
+#else
+static struct pca9633_platform_data *
+pca9633_dt_init(struct i2c_client *client)
+{
+       return ERR_PTR(-ENODEV);
+}
+#endif
+
 static int pca9633_probe(struct i2c_client *client,
                                        const struct i2c_device_id *id)
 {
@@ -102,6 +164,14 @@ static int pca9633_probe(struct i2c_client *client,
 
        pdata = client->dev.platform_data;
 
+       if (!pdata) {
+               pdata = pca9633_dt_init(client);
+               if (IS_ERR(pdata)) {
+                       dev_warn(&client->dev, "could not parse configuration\n");
+                       pdata = NULL;
+               }
+       }
+
        if (pdata) {
                if (pdata->leds.num_leds <= 0 || pdata->leds.num_leds > 4) {
                        dev_err(&client->dev, "board info must claim at most 4 LEDs");
@@ -181,6 +251,7 @@ static struct i2c_driver pca9633_driver = {
        .driver = {
                .name   = "leds-pca9633",
                .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(of_pca9633_match),
        },
        .probe  = pca9633_probe,
        .remove = pca9633_remove,