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LEDS: tca6507: add device-tree support for GPIO configuration. 

The 7 lines driven by the TCA6507 can either drive LEDs or act as output-only
GPIOs.

To make this distinction in devicetree we use the "compatible" property.

If the device attached to a line is "compatible" with "gpio", we treat it
like a GPIO.  If it is "compatible" with "led" (or if no "compatible" value
is set) we treat it like an LED.

(cooloney@gmail.com: fix typo in the subject)

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
NeilBrown 2013-10-31 19:41:20 -07:00 committed by Bryan Wu
parent 9334129e8e
commit 10ead6e599
2 changed files with 22 additions and 0 deletions
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16
Documentation/devicetree/bindings/leds/tca6507.txt
View File

@ -2,6 +2,13 @@ LEDs connected to tca6507
Required properties:
- compatible : should be : "ti,tca6507".
- #address-cells: must be 1
- #size-cells: must be 0
- reg: typically 0x45.
Optional properties:
- gpio-controller: allows lines to be used as output-only GPIOs.
- #gpio-cells: if present, must be 0.
Each led is represented as a sub-node of the ti,tca6507 device.
@ -10,6 +17,7 @@ LED sub-node properties:
- reg : number of LED line (could be from 0 to 6)
- linux,default-trigger : (optional)
see Documentation/devicetree/bindings/leds/common.txt
- compatible: either "led" (the default) or "gpio".
Examples:
@ -19,6 +27,9 @@ tca6507@45 {
#size-cells = <0>;
reg = <0x45>;
gpio-controller;
#gpio-cells = <2>;
led0: red-aux@0 {
label = "red:aux";
reg = <0x0>;
@ -29,5 +40,10 @@ tca6507@45 {
reg = <0x5>;
linux,default-trigger = "default-on";
};
wifi-reset@6 {
reg = <0x6>;
compatible = "gpio";
};
};

6
drivers/leds/leds-tca6507.c
View File

@ -638,6 +638,9 @@ static int tca6507_probe_gpios(struct i2c_client *client,
tca->gpio.direction_output = tca6507_gpio_direction_output;
tca->gpio.set = tca6507_gpio_set_value;
tca->gpio.dev = &client->dev;
#ifdef CONFIG_OF_GPIO
tca->gpio.of_node = of_node_get(client->dev.of_node);
#endif
err = gpiochip_add(&tca->gpio);
if (err) {
tca->gpio.ngpio = 0;
@ -696,6 +699,8 @@ tca6507_led_dt_init(struct i2c_client *client)
led.default_trigger =
of_get_property(child, "linux,default-trigger", NULL);
led.flags = 0;
if (of_property_match_string(child, "compatible", "gpio") >= 0)
led.flags |= TCA6507_MAKE_GPIO;
ret = of_property_read_u32(child, "reg", &reg);
if (ret != 0 || reg < 0 || reg >= NUM_LEDS)
continue;
@ -709,6 +714,7 @@ tca6507_led_dt_init(struct i2c_client *client)
pdata->leds.leds = tca_leds;
pdata->leds.num_leds = NUM_LEDS;
pdata->gpio_base = -1;
return pdata;
}