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>

Documentation/devicetree/bindings/leds/tca6507.txt

@@ -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";
+	};
 };
 

drivers/leds/leds-tca6507.c

@@ -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;
 }