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leds: leds-ns2: add device tree binding

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Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Simon Guinot 2012-10-17 12:09:03 +02:00 committed by Jason Cooper
parent bff0844513
commit 72052fcc10
2 changed files with 101 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

26
Documentation/devicetree/bindings/gpio/leds-ns2.txt Normal file
View file

@ -0,0 +1,26 @@
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>;
};
};

72
drivers/leds/leds-ns2.c
View file

@ -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),
},
};