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video: backlight: lm3533: set up backlight according to device tree

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Configure backlight lm3533 child according to device tree description.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
This commit is contained in:
Svyatoslav Ryhel
2025-02-21 17:47:36 +02:00
parent 1d4e23d3d4
commit 93930dee12
1 changed files with 34 additions and 22 deletions
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56
drivers/video/lm3533_backlight.c
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@@ -18,9 +18,13 @@
#define LM3533_BL_MAX_BRIGHTNESS 0xFF
#define LM3533_SINK_OUTPUT_CONFIG_1 0x10
#define LM3533_CONTROL_BANK_A_PWM 0x14
#define LM3533_CONTROL_PWM_BASE 0x14
#define PWM_MAX GENMASK(5, 0)
#define LM3533_CONTROL_BANK_AB_BRIGHTNESS 0x1A
#define LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT 0x1F
#define LM3533_CONTROL_FULLSCALE_CURRENT_BASE 0x1F
#define MAX_CURRENT_MIN 5000
#define MAX_CURRENT_MAX 29800
#define MAX_CURRENT_STEP 800
#define LM3533_CONTROL_BANK_ENABLE 0x27
#define LM3533_OVP_FREQUENCY_PWM_POLARITY 0x2C
#define BOOST_OVP_MASK GENMASK(2, 1)
@@ -51,34 +55,42 @@ struct lm3533_backlight_priv {
static int lm3533_backlight_enable(struct udevice *dev)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
u8 val, id = priv->reg;
int ret;
/* HVLED 1 & 2 are controlled by Bank A */
ret = dm_i2c_reg_write(dev, LM3533_SINK_OUTPUT_CONFIG_1, 0x00);
if (priv->linear) {
ret = dm_i2c_reg_clrset(dev, LM3533_CONTROL_BANK_AB_BRIGHTNESS,
BIT(2 * id + 1), BIT(2 * id + 1));
if (ret)
return ret;
}
if (priv->hvled) {
ret = dm_i2c_reg_clrset(dev, LM3533_SINK_OUTPUT_CONFIG_1,
BIT(0) | BIT(1), id | id << 1);
if (ret)
return ret;
}
/* Set current */
if (priv->max_current < MAX_CURRENT_MIN || priv->max_current > MAX_CURRENT_MAX)
return -EINVAL;
val = (priv->max_current - MAX_CURRENT_MIN) / MAX_CURRENT_STEP;
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_FULLSCALE_CURRENT_BASE + id, val);
if (ret)
return ret;
/* PWM input is disabled for CABC */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_PWM, 0x00);
/* Set PWM mask */
if (priv->pwm > PWM_MAX)
return -EINVAL;
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_PWM_BASE + id, priv->pwm);
if (ret)
return ret;
/* Linear & Control Bank A is configured for register Current control */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_AB_BRIGHTNESS, 0x02);
if (ret)
return ret;
/* Full-Scale Current (20.2mA) */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT, 0x13);
if (ret)
return ret;
/* Control Bank A is enable */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_ENABLE, 0x01);
if (ret)
return ret;
return 0;
/* Enable Control Bank */
return dm_i2c_reg_clrset(dev, LM3533_CONTROL_BANK_ENABLE, BIT(id), BIT(id));
}
static int lm3533_backlight_set_brightness(struct udevice *dev, int percent)