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>
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45
Documentation/devicetree/bindings/leds/pca9633.txt
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45
Documentation/devicetree/bindings/leds/pca9633.txt
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@ -0,0 +1,45 @@
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LEDs connected to pca9633 or pca9632
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Required properties:
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- compatible : should be : "nxp,pca963x"
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Optional properties:
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- nxp,totem-pole : use totem pole (push-pull) instead of default open-drain
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Each led is represented as a sub-node of the nxp,pca9633 device.
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LED sub-node properties:
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- label : (optional) see Documentation/devicetree/bindings/leds/common.txt
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- reg : number of LED line (could be from 0 to 4)
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- linux,default-trigger : (optional)
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see Documentation/devicetree/bindings/leds/common.txt
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Examples:
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pca9632: pca9632 {
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compatible = "nxp,pca9632", "nxp,pca963x";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x62>;
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red@0 {
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label = "red";
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reg = <0>;
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linux,default-trigger = "none";
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};
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green@1 {
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label = "green";
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reg = <1>;
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linux,default-trigger = "none";
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};
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blue@2 {
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label = "blue";
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reg = <2>;
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linux,default-trigger = "none";
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};
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unused@3 {
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label = "unused";
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reg = <3>;
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linux,default-trigger = "none";
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};
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};
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@ -22,6 +22,7 @@
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#include <linux/i2c.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/platform_data/leds-pca9633.h>
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/* LED select registers determine the source that drives LED outputs */
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@ -93,6 +94,67 @@ static void pca9633_led_set(struct led_classdev *led_cdev,
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schedule_work(&pca9633->work);
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}
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#if IS_ENABLED(CONFIG_OF)
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static struct pca9633_platform_data *
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pca9633_dt_init(struct i2c_client *client)
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{
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struct device_node *np = client->dev.of_node, *child;
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struct pca9633_platform_data *pdata;
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struct led_info *pca9633_leds;
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int count;
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count = of_get_child_count(np);
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if (!count || count > 4)
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return ERR_PTR(-ENODEV);
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pca9633_leds = devm_kzalloc(&client->dev,
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sizeof(struct led_info) * count, GFP_KERNEL);
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if (!pca9633_leds)
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return ERR_PTR(-ENOMEM);
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for_each_child_of_node(np, child) {
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struct led_info led;
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u32 reg;
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int res;
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led.name =
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of_get_property(child, "label", NULL) ? : child->name;
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led.default_trigger =
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of_get_property(child, "linux,default-trigger", NULL);
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res = of_property_read_u32(child, "reg", ®);
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if (res != 0)
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continue;
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pca9633_leds[reg] = led;
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}
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pdata = devm_kzalloc(&client->dev,
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sizeof(struct pca9633_platform_data), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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pdata->leds.leds = pca9633_leds;
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pdata->leds.num_leds = count;
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/* default to open-drain unless totem pole (push-pull) is specified */
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if (of_property_read_bool(np, "nxp,totem-pole"))
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pdata->outdrv = PCA9633_TOTEM_POLE;
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else
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pdata->outdrv = PCA9633_OPEN_DRAIN;
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return pdata;
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}
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static const struct of_device_id of_pca9633_match[] = {
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{ .compatible = "nxp,pca963x", },
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{},
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};
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#else
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static struct pca9633_platform_data *
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pca9633_dt_init(struct i2c_client *client)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif
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static int pca9633_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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@ -102,6 +164,14 @@ static int pca9633_probe(struct i2c_client *client,
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pdata = client->dev.platform_data;
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if (!pdata) {
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pdata = pca9633_dt_init(client);
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if (IS_ERR(pdata)) {
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dev_warn(&client->dev, "could not parse configuration\n");
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pdata = NULL;
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}
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}
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if (pdata) {
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if (pdata->leds.num_leds <= 0 || pdata->leds.num_leds > 4) {
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dev_err(&client->dev, "board info must claim at most 4 LEDs");
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@ -181,6 +251,7 @@ static struct i2c_driver pca9633_driver = {
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.driver = {
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.name = "leds-pca9633",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(of_pca9633_match),
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},
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.probe = pca9633_probe,
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.remove = pca9633_remove,
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