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| author | Maarten Zanders <maarten.zanders@mind.be> | 2023-04-21 09:53:05 +0200 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2023-05-25 13:16:05 +0200 |
| commit | 54a7bef5aa8d5247a78d79460bac47849b91a28b (patch) | |
| tree | 1e92eed8d6419643d6a19b103ee6d77bd32ceadf /drivers/leds/leds-lp5523.c | |
| parent | dt-bindings: leds-lp55xx: Add ti,charge-pump-mode (diff) | |
| download | linux-54a7bef5aa8d5247a78d79460bac47849b91a28b.tar.xz linux-54a7bef5aa8d5247a78d79460bac47849b91a28b.zip | |
leds: lp55xx: Configure internal charge pump
The LP55xx range of devices have an internal charge pump which
can (automatically) increase the output voltage towards the
LED's, boosting the output voltage to 4.5V.
Implement this option from the devicetree. When the setting
is not present it will operate in automatic mode as before.
Tested on LP55231. Datasheet analysis shows that LP5521, LP5523
and LP8501 are identical in topology and are modified in the
same way.
Signed-off-by: Maarten Zanders <maarten.zanders@mind.be>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230421075305.37597-3-maarten.zanders@mind.be
Diffstat (limited to 'drivers/leds/leds-lp5523.c')
| -rw-r--r-- | drivers/leds/leds-lp5523.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c index 55da914b8e5c..a8df22938bdb 100644 --- a/drivers/leds/leds-lp5523.c +++ b/drivers/leds/leds-lp5523.c @@ -57,8 +57,11 @@ #define LP5523_AUTO_INC 0x40 #define LP5523_PWR_SAVE 0x20 #define LP5523_PWM_PWR_SAVE 0x04 -#define LP5523_CP_AUTO 0x18 +#define LP5523_CP_MODE_MASK 0x18 +#define LP5523_CP_MODE_SHIFT 3 #define LP5523_AUTO_CLK 0x02 +#define LP5523_DEFAULT_CONFIG \ + (LP5523_AUTO_INC | LP5523_PWR_SAVE | LP5523_AUTO_CLK | LP5523_PWM_PWR_SAVE) #define LP5523_EN_LEDTEST 0x80 #define LP5523_LEDTEST_DONE 0x80 @@ -125,6 +128,7 @@ static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current) static int lp5523_post_init_device(struct lp55xx_chip *chip) { int ret; + int val; ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); if (ret) @@ -133,10 +137,10 @@ static int lp5523_post_init_device(struct lp55xx_chip *chip) /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ usleep_range(1000, 2000); - ret = lp55xx_write(chip, LP5523_REG_CONFIG, - LP5523_AUTO_INC | LP5523_PWR_SAVE | - LP5523_CP_AUTO | LP5523_AUTO_CLK | - LP5523_PWM_PWR_SAVE); + val = LP5523_DEFAULT_CONFIG; + val |= (chip->pdata->charge_pump_mode << LP5523_CP_MODE_SHIFT) & LP5523_CP_MODE_MASK; + + ret = lp55xx_write(chip, LP5523_REG_CONFIG, val); if (ret) return ret; |