leds: lp55xx: support dynamic channel settings in the device tree structure
Currently, the LP55xx DT structure supports max 3 channels.
However, LP5523 has max 9 channels and LP5562 has 4 channels.
To enhance this constraint, the DT structure has been changed.
(a) Use the child node for various channel settings instead of fixed array
(b) Remove 'num_channel' property.
This value can be retrieved by counting the children node.
(c) 'chan-name' property supported
(d) Documentation updates for LP5521 and LP5523
(cooloney@gmail.com: fix a coding style issue in leds-lp55xx.txt)
Cc: Gabriel Fernandez <gabriel.fernandez@stericsson.com>
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
index a0d2bd2..c2fecd4 100644
--- a/drivers/leds/leds-lp55xx-common.c
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -557,51 +557,42 @@
int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
{
+ struct device_node *child;
struct lp55xx_platform_data *pdata;
- u8 led_cur[3];
- u8 max_cur[3];
- u8 clock_mode;
- u8 num_channel;
- const char *label;
- struct lp55xx_led_config *led_config;
- int ret;
- int i;
+ struct lp55xx_led_config *cfg;
+ int num_channels;
+ int i = 0;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
- ret = of_property_read_u8(np, "num-channel", &num_channel);
- if (ret < 0)
- return ret;
- ret = of_property_read_u8_array(np, "led-cur", led_cur, num_channel);
- if (ret < 0)
- return ret;
- ret = of_property_read_u8_array(np, "max-cur", max_cur, num_channel);
- if (ret < 0)
- return ret;
- ret = of_property_read_string(np, "label", &label);
- if (ret < 0)
- return ret;
- ret = of_property_read_u8_array(np, "clock-mode", &clock_mode, 1);
- if (ret < 0)
- return ret;
+ num_channels = of_get_child_count(np);
+ if (num_channels == 0) {
+ dev_err(dev, "no LED channels\n");
+ return -EINVAL;
+ }
- led_config = devm_kzalloc(dev, sizeof(*led_config) * num_channel,
- GFP_KERNEL);
- if (!led_config)
+ cfg = devm_kzalloc(dev, sizeof(*cfg) * num_channels, GFP_KERNEL);
+ if (!cfg)
return -ENOMEM;
- for (i = 0; i < num_channel; i++) {
- led_config[i].chan_nr = i;
- led_config[i].led_current = led_cur[i];
- led_config[i].max_current = max_cur[i];
+ pdata->led_config = &cfg[0];
+ pdata->num_channels = num_channels;
+
+ for_each_child_of_node(np, child) {
+ cfg[i].chan_nr = i;
+
+ of_property_read_string(child, "chan-name", &cfg[i].name);
+ of_property_read_u8(child, "led-cur", &cfg[i].led_current);
+ of_property_read_u8(child, "max-cur", &cfg[i].max_current);
+
+ i++;
}
- pdata->label = kzalloc(sizeof(char) * 32, GFP_KERNEL);
- strcpy((char *)pdata->label, (char *) label);
- pdata->led_config = &led_config[0];
- pdata->num_channels = num_channel;
- pdata->clock_mode = clock_mode;
+
+ of_property_read_string(np, "label", &pdata->label);
+ of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
+
dev->platform_data = pdata;
return 0;