Commit 72052fcc authored by Simon Guinot's avatar Simon Guinot Committed by Jason Cooper
Browse files

leds: leds-ns2: add device tree binding 



Signed-off-by: default avatarSimon Guinot <simon.guinot@sequanux.org>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent bff08445

Documentation/devicetree/bindings/gpio/leds-ns2.txt

0 → 100644
+26 −0
Original line number Diff line number Diff line 
Binding for dual-GPIO LED found on Network Space v2 (and parents).



Required properties:

- compatible: "lacie,ns2-leds".



Each LED is represented as a sub-node of the ns2-leds device.



Required sub-node properties:

- cmd-gpio: Command LED GPIO. See OF device-tree GPIO specification.

- slow-gpio: Slow LED GPIO. See OF device-tree GPIO specification.



Optional sub-node properties:

- label: Name for this LED. If omitted, the label is taken from the node name.

- linux,default-trigger: Trigger assigned to the LED.



Example:



ns2-leds {

	compatible = "lacie,ns2-leds";



	blue-sata {

		label = "ns2:blue:sata";

		slow-gpio = <&gpio0 29 0>;

		cmd-gpio = <&gpio0 30 0>;

	};

};

drivers/leds/leds-ns2.c

+75 −3
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <linux/leds.h>

#include <linux/module.h>

#include <linux/platform_data/leds-kirkwood-ns2.h>

#include <linux/of_gpio.h>



/*

 * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
@@ -263,6 +264,62 @@ static void delete_ns2_led(struct ns2_led_data *led_dat) 
	gpio_free(led_dat->slow);

}



#ifdef CONFIG_OF_GPIO

/*

 * Translate OpenFirmware node properties into platform_data.

 */

static int __devinit

ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)

{

	struct device_node *np = dev->of_node;

	struct device_node *child;

	struct ns2_led *leds;

	int num_leds = 0;

	int i = 0;



	num_leds = of_get_child_count(np);

	if (!num_leds)

		return -ENODEV;



	leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),

			    GFP_KERNEL);

	if (!leds)

		return -ENOMEM;



	for_each_child_of_node(np, child) {

		const char *string;

		int ret;



		ret = of_get_named_gpio(child, "cmd-gpio", 0);

		if (ret < 0)

			return ret;

		leds[i].cmd = ret;

		ret = of_get_named_gpio(child, "slow-gpio", 0);

		if (ret < 0)

			return ret;

		leds[i].slow = ret;

		ret = of_property_read_string(child, "label", &string);

		leds[i].name = (ret == 0) ? string : child->name;

		ret = of_property_read_string(child, "linux,default-trigger",

					      &string);

		if (ret == 0)

			leds[i].default_trigger = string;



		i++;

	}



	pdata->leds = leds;

	pdata->num_leds = num_leds;



	return 0;

}



static const struct of_device_id of_ns2_leds_match[] = {

	{ .compatible = "lacie,ns2-leds", },

	{},

};

#endif /* CONFIG_OF_GPIO */



static int __devinit ns2_led_probe(struct platform_device *pdev)

{

	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
@@ -270,8 +327,22 @@ static int __devinit ns2_led_probe(struct platform_device *pdev) 
	int i;

	int ret;



#ifdef CONFIG_OF_GPIO

	if (!pdata) {

		pdata = devm_kzalloc(&pdev->dev,

				     sizeof(struct ns2_led_platform_data),

				     GFP_KERNEL);

		if (!pdata)

			return -ENOMEM;



		ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);

		if (ret)

			return ret;

	}

#else

	if (!pdata)

		return -EINVAL;

#endif /* CONFIG_OF_GPIO */



	leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *

				 pdata->num_leds, GFP_KERNEL);
@@ -314,6 +385,7 @@ static struct platform_driver ns2_led_driver = { 
	.driver		= {

		.name		= "leds-ns2",

		.owner		= THIS_MODULE,

		.of_match_table	= of_match_ptr(of_ns2_leds_match),

	},

};