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leds: Add device tree binding for pca9633

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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>
This commit is contained in:
Tony Lindgren 2013-06-26 15:52:49 +03:00 committed by Bryan Wu
parent d8dfad3876
commit 81d2287809
2 changed files with 116 additions and 0 deletions
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45
Documentation/devicetree/bindings/leds/pca9633.txt Normal file
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@ -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";
};
};

71
drivers/leds/leds-pca9633.c
View File

@ -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,