On Mon, 13 Feb 2023, Maarten Zanders wrote:
> 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@xxxxxxx>
> ---
>
> Notes:
> v1: implement as bool to disable charge pump
> v2: rewrite to use string configuration, supporting all modes
> v3: simplification by replacing string from DTS by constant
> v4: added notes
> v5: property type to u32
>
> drivers/leds/leds-lp5521.c | 12 ++++++------
> drivers/leds/leds-lp5523.c | 18 +++++++++++++-----
> drivers/leds/leds-lp55xx-common.c | 14 ++++++++++++++
> drivers/leds/leds-lp8501.c | 8 ++++++--
> include/linux/platform_data/leds-lp55xx.h | 3 +++
> 5 files changed, 42 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
> index 19478d9c19a7..76c6b81afb38 100644
> --- a/drivers/leds/leds-lp5521.c
> +++ b/drivers/leds/leds-lp5521.c
> @@ -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 +307,9 @@ 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;
> diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
> index e08e3de1428d..b5d10d4252e6 100644
> --- a/drivers/leds/leds-lp5523.c
> +++ b/drivers/leds/leds-lp5523.c
> @@ -57,8 +57,12 @@
> #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 +129,7 @@ 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 +138,13 @@ 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;
>
> diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
> index c1940964067a..5a02c4a4ec98 100644
> --- a/drivers/leds/leds-lp55xx-common.c
> +++ b/drivers/leds/leds-lp55xx-common.c
> @@ -19,6 +19,8 @@
> #include <linux/slab.h>
> #include <linux/gpio/consumer.h>
>
> +#include <dt-bindings/leds/leds-lp55xx.h>
> +
> #include "leds-lp55xx-common.h"
>
> /* External clock rate */
> @@ -691,6 +693,18 @@ struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
> i++;
> }
>
> + ret = of_property_read_u32(np, "ti,charge-pump-mode",
> + &pdata->charge_pump_mode);
> + if (ret) {
> + pdata->charge_pump_mode = LP55XX_CP_AUTO;
> + } else {
You can clean this up by dropping the else.
> + if (pdata->charge_pump_mode > LP55XX_CP_AUTO) {
> + dev_err(dev, "invalid charge pump mode %d\n",
> + pdata->charge_pump_mode);
Then this can be single line.
> + return ERR_PTR(-EINVAL);
> + }
> + }
> +
> of_property_read_string(np, "label", &pdata->label);
> of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
>
> diff --git a/drivers/leds/leds-lp8501.c b/drivers/leds/leds-lp8501.c
> index ae11a02c0ab2..f0e70e116919 100644
> --- a/drivers/leds/leds-lp8501.c
> +++ b/drivers/leds/leds-lp8501.c
> @@ -53,10 +53,11 @@
> #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)
> + (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE)
>
> #define LP8501_REG_RESET 0x3D
> #define LP8501_RESET 0xFF
> @@ -102,6 +103,9 @@ 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;
> diff --git a/include/linux/platform_data/leds-lp55xx.h b/include/linux/platform_data/leds-lp55xx.h
> index 3441064713a3..3cc8db0b12b5 100644
> --- a/include/linux/platform_data/leds-lp55xx.h
> +++ b/include/linux/platform_data/leds-lp55xx.h
> @@ -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;
>
> --
> 2.37.3
>
--
Lee Jones [李琼斯]
