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leds: lp55xx: enable setting default trigger

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This enables setting a default trigger on an LP55xx channel,
either from platform data or device tree. This mechanism is
identical to the mechanism for GPIO LEDs and references the
common LEDs device tree bindings.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Milo Kim <milo.kim@ti.com>
Acked-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Linus Walleij 2013-09-15 03:50:17 -07:00 • committed by Bryan Wu
parent 2491c5c8c9
commit f65f0a1a98
3 changed files with 11 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Documentation/devicetree/bindings/leds/leds-lp55xx.txt
View file

@ -17,12 +17,15 @@ Optional properties:
2: D1~6 with VOUT, D7~9 with VDD 2: D1~6 with VOUT, D7~9 with VDD
3: D1~9 are connected to VOUT 3: D1~9 are connected to VOUT
Alternatively, each child can have specific channel name Alternatively, each child can have a specific channel name and trigger:
- chan-name: Name of each channel name - chan-name (optional): name of channel
- linux,default-trigger (optional): see
Documentation/devicetree/bindings/leds/common.txt
example 1) LP5521 example 1) LP5521
3 LED channels, external clock used. Channel names are 'lp5521_pri:channel0', 3 LED channels, external clock used. Channel names are 'lp5521_pri:channel0',
'lp5521_pri:channel1' and 'lp5521_pri:channel2' 'lp5521_pri:channel1' and 'lp5521_pri:channel2', with a heartbeat trigger
on channel 0.
lp5521@32 { lp5521@32 {
compatible = "national,lp5521"; compatible = "national,lp5521";
@ -33,6 +36,7 @@ lp5521@32 {
chan0 { chan0 {
led-cur = /bits/ 8 <0x2f>; led-cur = /bits/ 8 <0x2f>;
max-cur = /bits/ 8 <0x5f>; max-cur = /bits/ 8 <0x5f>;
linux,default-trigger = "heartbeat";
}; };
chan1 { chan1 {

3
drivers/leds/leds-lp55xx-common.c
View file

@ -165,6 +165,7 @@ static int lp55xx_init_led(struct lp55xx_led *led,
led->led_current = pdata->led_config[chan].led_current; led->led_current = pdata->led_config[chan].led_current;
led->max_current = pdata->led_config[chan].max_current; led->max_current = pdata->led_config[chan].max_current;
led->chan_nr = pdata->led_config[chan].chan_nr; led->chan_nr = pdata->led_config[chan].chan_nr;
led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
if (led->chan_nr >= max_channel) { if (led->chan_nr >= max_channel) {
dev_err(dev, "Use channel numbers between 0 and %d\n", dev_err(dev, "Use channel numbers between 0 and %d\n",
@ -586,6 +587,8 @@ int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
of_property_read_string(child, "chan-name", &cfg[i].name); 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, "led-cur", &cfg[i].led_current);
of_property_read_u8(child, "max-cur", &cfg[i].max_current); of_property_read_u8(child, "max-cur", &cfg[i].max_current);
cfg[i].default_trigger =
of_get_property(child, "linux,default-trigger", NULL);
i++; i++;
} }

1
include/linux/platform_data/leds-lp55xx.h
View file

@ -22,6 +22,7 @@
struct lp55xx_led_config { struct lp55xx_led_config {
const char *name; const char *name;
const char *default_trigger;
u8 chan_nr; u8 chan_nr;
u8 led_current; /* mA x10, 0 if led is not connected */ u8 led_current; /* mA x10, 0 if led is not connected */
u8 max_current; u8 max_current;