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leds: lp55xx: Configure internal charge pump

Browse source 
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
This commit is contained in:
Maarten Zanders 2023-04-21 09:53:05 +02:00 committed by Lee Jones
parent 91e47d4083
commit 54a7bef5aa
5 changed files with 31 additions and 14 deletions
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11
drivers/leds/leds-lp5521.c
View file

@ -58,14 +58,11 @@
/* CONFIG register */
#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
#define LP5521_CP_MODE_MASK 0x18 /* Charge pump mode */
#define LP5521_CP_MODE_SHIFT 3
#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
#define LP5521_CLK_INT 0x01 /* Internal clock */
#define LP5521_DEFAULT_CFG \
(LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
#define LP5521_DEFAULT_CFG (LP5521_PWM_HF | LP5521_PWRSAVE_EN)
/* Status */
#define LP5521_EXT_CLK_USED 0x08
@ -310,6 +307,8 @@ static int lp5521_post_init_device(struct lp55xx_chip *chip)
if (!lp55xx_is_extclk_used(chip))
val |= LP5521_CLK_INT;
val |= (chip->pdata->charge_pump_mode << LP5521_CP_MODE_SHIFT) & LP5521_CP_MODE_MASK;
ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
if (ret)
return ret;

14
drivers/leds/leds-lp5523.c
View file

@ -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;

9
drivers/leds/leds-lp55xx-common.c
View file

@ -18,6 +18,7 @@
#include <linux/platform_data/leds-lp55xx.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <dt-bindings/leds/leds-lp55xx.h>
#include "leds-lp55xx-common.h"
@ -691,6 +692,14 @@ struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
i++;
}
if (of_property_read_u32(np, "ti,charge-pump-mode", &pdata->charge_pump_mode))
pdata->charge_pump_mode = LP55XX_CP_AUTO;
if (pdata->charge_pump_mode > LP55XX_CP_AUTO) {
dev_err(dev, "invalid charge pump mode %d\n", pdata->charge_pump_mode);
return ERR_PTR(-EINVAL);
}
of_property_read_string(np, "label", &pdata->label);
of_property_read_u8(np, "clock-mode", &pdata->clock_mode);

8
drivers/leds/leds-lp8501.c
View file

@ -53,10 +53,10 @@
#define LP8501_PWM_PSAVE BIT(7)
#define LP8501_AUTO_INC BIT(6)
#define LP8501_PWR_SAVE BIT(5)
#define LP8501_CP_AUTO 0x18
#define LP8501_CP_MODE_MASK 0x18
#define LP8501_CP_MODE_SHIFT 3
#define LP8501_INT_CLK BIT(0)
#define LP8501_DEFAULT_CFG \
(LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE | LP8501_CP_AUTO)
#define LP8501_DEFAULT_CFG (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE)
#define LP8501_REG_RESET 0x3D
#define LP8501_RESET 0xFF
@ -102,6 +102,8 @@ static int lp8501_post_init_device(struct lp55xx_chip *chip)
if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
val |= LP8501_INT_CLK;
val |= (chip->pdata->charge_pump_mode << LP8501_CP_MODE_SHIFT) & LP8501_CP_MODE_MASK;
ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
if (ret)
return ret;

3
include/linux/platform_data/leds-lp55xx.h
View file

@ -73,6 +73,9 @@ struct lp55xx_platform_data {
/* Clock configuration */
u8 clock_mode;
/* Charge pump mode */
u32 charge_pump_mode;
/* optional enable GPIO */
struct gpio_desc *enable_gpiod;