[PATCH v2 10/10] pwm: imx: Add polarity inversion support to i.MX's PWMv2

[Lukasz Majewski]

With this patch the polarity settings for i.MX's PWMv2 is now supported
on top of atomic PWM setting

Signed-off-by: Bhuvanchandra DV <bhuvanchandra...@toradex.com>
Signed-off-by: Lukasz Majewski <l.majew...@majess.pl>
---
Changes for v2:
- New patch
---
 drivers/pwm/pwm-imx.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index 0132439a..92b4ba0 100644
--- a/drivers/pwm/pwm-imx.c
+++ b/drivers/pwm/pwm-imx.c
@@ -38,6 +38,7 @@
 #define MX3_PWMCR_DOZEEN               (1 << 24)
 #define MX3_PWMCR_WAITEN               (1 << 23)
 #define MX3_PWMCR_DBGEN                        (1 << 22)
+#define MX3_PWMCR_POUTC                        (1 << 18)
 #define MX3_PWMCR_CLKSRC_IPG_HIGH      (2 << 16)
 #define MX3_PWMCR_CLKSRC_IPG           (1 << 16)
 #define MX3_PWMCR_SWR                  (1 << 3)
@@ -234,6 +235,9 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct 
pwm_device *pwm,
        if (state->enabled)
                cr |= MX3_PWMCR_EN;
 
+       if (state->polarity == PWM_POLARITY_INVERSED)
+               cr |= MX3_PWMCR_POUTC;
+
        writel(cr, imx->mmio_base + MX3_PWMCR);
 
        /* Disable the clock if the PWM is being disabled. */
@@ -258,6 +262,7 @@ static struct pwm_ops imx_pwm_ops_v2 = {
 };
 
 struct imx_pwm_data {
+       bool polarity_supported;
        struct pwm_ops *pwm_ops;
 };
 
@@ -266,6 +271,7 @@ static struct imx_pwm_data imx_pwm_data_v1 = {
 };
 
 static struct imx_pwm_data imx_pwm_data_v2 = {
+       .polarity_supported = true,
        .pwm_ops = &imx_pwm_ops_v2,
 };
 
@@ -313,6 +319,11 @@ static int imx_pwm_probe(struct platform_device *pdev)
        imx->chip.base = -1;
        imx->chip.npwm = 1;
        imx->chip.can_sleep = true;
+       if (data->polarity_supported) {
+               dev_dbg(&pdev->dev, "PWM supports output inversion\n");
+               imx->chip.of_xlate = of_pwm_xlate_with_flags;
+               imx->chip.of_pwm_n_cells = 3;
+       }
 
        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        imx->mmio_base = devm_ioremap_resource(&pdev->dev, r);
-- 
2.1.4