From 3ccb1c1702ed4bb07006d20c8173899a69dae242 Mon Sep 17 00:00:00 2001 From: Tony Prisk Date: Thu, 3 Jan 2013 08:44:16 +1300 Subject: pwm: vt8500: Add polarity support 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 Signed-off-by: Thierry Reding --- drivers/pwm/pwm-vt8500.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'drivers/pwm') diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c index bbc37504103..98d79e9f014 100644 --- a/drivers/pwm/pwm-vt8500.c +++ b/drivers/pwm/pwm-vt8500.c @@ -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; -- cgit v1.2.3-18-g5258