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pwm: tegra: add set_invert PWM operation

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Add active-low support to the PWM controller, useful for active-low
pwm-leds.

Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
This commit is contained in:
Jonas Schwöbel
2026-03-22 14:43:26 +02:00
committed by Svyatoslav Ryhel
parent 5dcdbcf783
commit 0623b8512e
1 changed files with 17 additions and 0 deletions
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drivers/pwm/tegra_pwm.c
+17
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@@ -13,8 +13,21 @@
struct tegra_pwm_priv {
struct pwm_ctlr *regs;
u8 polarity;
};
static int tegra_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
{
struct tegra_pwm_priv *priv = dev_get_priv(dev);
if (channel >= 4)
return -EINVAL;
clrsetbits_8(&priv->polarity, BIT(channel), (polarity << channel));
return 0;
}
static int tegra_pwm_set_config(struct udevice *dev, uint channel,
uint period_ns, uint duty_ns)
{
@@ -29,6 +42,9 @@ static int tegra_pwm_set_config(struct udevice *dev, uint channel,
pulse_width = duty_ns * 255 / period_ns;
if (priv->polarity & BIT(channel))
pulse_width = 256 - pulse_width;
reg = pulse_width << PWM_WIDTH_SHIFT;
reg |= 1 << PWM_DIVIDER_SHIFT;
reg |= PWM_ENABLE_MASK;
@@ -80,6 +96,7 @@ static int tegra_pwm_probe(struct udevice *dev)
static const struct pwm_ops tegra_pwm_ops = {
.set_config = tegra_pwm_set_config,
.set_enable = tegra_pwm_set_enable,
.set_invert = tegra_pwm_set_invert,
};
static const struct udevice_id tegra_pwm_ids[] = {