leds: leds-ns2: add device tree binding
Signed-off-by: Simon Guinot <simon.guinot@sequanux.org> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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Коммит
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@ -0,0 +1,26 @@
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Binding for dual-GPIO LED found on Network Space v2 (and parents).
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Required properties:
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- compatible: "lacie,ns2-leds".
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Each LED is represented as a sub-node of the ns2-leds device.
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Required sub-node properties:
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- cmd-gpio: Command LED GPIO. See OF device-tree GPIO specification.
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- slow-gpio: Slow LED GPIO. See OF device-tree GPIO specification.
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Optional sub-node properties:
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- label: Name for this LED. If omitted, the label is taken from the node name.
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- linux,default-trigger: Trigger assigned to the LED.
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Example:
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ns2-leds {
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compatible = "lacie,ns2-leds";
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blue-sata {
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label = "ns2:blue:sata";
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slow-gpio = <&gpio0 29 0>;
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cmd-gpio = <&gpio0 30 0>;
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};
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};
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@ -30,6 +30,7 @@
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/platform_data/leds-kirkwood-ns2.h>
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#include <linux/of_gpio.h>
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/*
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* The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
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@ -263,6 +264,62 @@ static void delete_ns2_led(struct ns2_led_data *led_dat)
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gpio_free(led_dat->slow);
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}
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#ifdef CONFIG_OF_GPIO
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/*
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* Translate OpenFirmware node properties into platform_data.
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*/
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static int __devinit
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ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
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{
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struct device_node *np = dev->of_node;
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struct device_node *child;
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struct ns2_led *leds;
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int num_leds = 0;
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int i = 0;
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num_leds = of_get_child_count(np);
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if (!num_leds)
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return -ENODEV;
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leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
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GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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for_each_child_of_node(np, child) {
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const char *string;
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int ret;
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ret = of_get_named_gpio(child, "cmd-gpio", 0);
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if (ret < 0)
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return ret;
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leds[i].cmd = ret;
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ret = of_get_named_gpio(child, "slow-gpio", 0);
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if (ret < 0)
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return ret;
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leds[i].slow = ret;
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ret = of_property_read_string(child, "label", &string);
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leds[i].name = (ret == 0) ? string : child->name;
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ret = of_property_read_string(child, "linux,default-trigger",
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&string);
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if (ret == 0)
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leds[i].default_trigger = string;
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i++;
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}
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pdata->leds = leds;
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pdata->num_leds = num_leds;
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return 0;
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}
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static const struct of_device_id of_ns2_leds_match[] = {
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{ .compatible = "lacie,ns2-leds", },
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{},
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};
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#endif /* CONFIG_OF_GPIO */
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static int __devinit ns2_led_probe(struct platform_device *pdev)
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{
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struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
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@ -270,11 +327,25 @@ static int __devinit ns2_led_probe(struct platform_device *pdev)
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int i;
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int ret;
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#ifdef CONFIG_OF_GPIO
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if (!pdata) {
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pdata = devm_kzalloc(&pdev->dev,
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sizeof(struct ns2_led_platform_data),
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GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
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if (ret)
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return ret;
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}
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#else
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if (!pdata)
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return -EINVAL;
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#endif /* CONFIG_OF_GPIO */
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leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
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pdata->num_leds, GFP_KERNEL);
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pdata->num_leds, GFP_KERNEL);
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if (!leds_data)
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return -ENOMEM;
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@ -312,8 +383,9 @@ static struct platform_driver ns2_led_driver = {
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.probe = ns2_led_probe,
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.remove = __devexit_p(ns2_led_remove),
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.driver = {
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.name = "leds-ns2",
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.owner = THIS_MODULE,
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.name = "leds-ns2",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(of_ns2_leds_match),
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},
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};
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