diff options
| author | Jonas Schwöbel <[email protected]> | 2025-03-11 23:06:46 +0100 |
|---|---|---|
| committer | Svyatoslav Ryhel <[email protected]> | 2026-03-22 14:43:26 +0200 |
| commit | 0623b8512e2d9128100949ca80ede990ed80f741 (patch) | |
| tree | 3115179f7c679c1800275773c2d6b03d9ed84010 /drivers | |
| parent | 5dcdbcf7833ae762866c43cbd872ba910576d228 (diff) | |
pwm: tegra: add set_invert PWM operation
Add active-low support to the PWM controller, useful for active-low
pwm-leds.
Signed-off-by: Jonas Schwöbel <[email protected]>
Signed-off-by: Svyatoslav Ryhel <[email protected]>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pwm/tegra_pwm.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/pwm/tegra_pwm.c b/drivers/pwm/tegra_pwm.c index 919728b821f..4b57751f73f 100644 --- a/drivers/pwm/tegra_pwm.c +++ b/drivers/pwm/tegra_pwm.c @@ -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[] = { |