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pwm: vt8500: Add polarity support

Browse source 
Add support to set polarity on PWM devices, allowing for inverted
duty cycles.

Also update the binding document to #pwm-cells = <3> to allow
passing the flags from devicetree.

Signed-off-by: Tony Prisk <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
This commit is contained in:
Tony Prisk 2013-01-03 08:44:16 +13:00 • committed by Thierry Reding
commit 3ccb1c1702
2 changed files with 29 additions and 3 deletions
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23
drivers/pwm/pwm-vt8500.c
View file

@ -164,10 +164,31 @@ static void vt8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
clk_disable(vt8500->clk);
}
static int vt8500_pwm_set_polarity(struct pwm_chip *chip,
struct pwm_device *pwm,
enum pwm_polarity polarity)
{
struct vt8500_chip *vt8500 = to_vt8500_chip(chip);
u32 val;
val = readl(vt8500->base + REG_CTRL(pwm->hwpwm));
if (polarity == PWM_POLARITY_INVERSED)
val |= CTRL_INVERT;
else
val &= ~CTRL_INVERT;
writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
return 0;
}
static struct pwm_ops vt8500_pwm_ops = {
.enable = vt8500_pwm_enable,
.disable = vt8500_pwm_disable,
.config = vt8500_pwm_config,
.set_polarity = vt8500_pwm_set_polarity,
.owner = THIS_MODULE,
};
@ -197,6 +218,8 @@ static int vt8500_pwm_probe(struct platform_device *pdev)
chip->chip.dev = &pdev->dev;
chip->chip.ops = &vt8500_pwm_ops;
chip->chip.of_xlate = of_pwm_xlate_with_flags;
chip->chip.of_pwm_n_cells = 3;
chip->chip.base = -1;
chip->chip.npwm = VT8500_NR_PWMS;