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authorLukasz Majewski <lukma@denx.de>2017-01-29 22:54:15 +0100
committerThierry Reding <thierry.reding@gmail.com>2017-01-30 09:13:07 +0100
commit326ed314fefebb259563926c8c6110a009562e07 (patch)
tree6632352a509854ee4dc52f8edadaaa8ad4dcf1d4 /drivers/pwm/pwm-imx.c
parentc322f457755aea8eea91c79c473e17ffa7f12cfc (diff)
pwm: imx: Add polarity inversion support to i.MX's PWMv2
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.dv@toradex.com> Signed-off-by: Lukasz Majewski <l.majewski@majess.pl> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-imx.c')
-rw-r--r--drivers/pwm/pwm-imx.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index 0a81c028cb11..957099e82ed3 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)
@@ -163,6 +164,7 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm,
struct pwm_state cstate;
unsigned long long c;
int ret;
+ u32 cr;
pwm_get_state(pwm, &cstate);
@@ -207,11 +209,15 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm,
writel(duty_cycles, imx->mmio_base + MX3_PWMSAR);
writel(period_cycles, imx->mmio_base + MX3_PWMPR);
- writel(MX3_PWMCR_PRESCALER(prescale) |
- MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
- MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH |
- MX3_PWMCR_EN,
- imx->mmio_base + MX3_PWMCR);
+ cr = MX3_PWMCR_PRESCALER(prescale) |
+ MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
+ MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH |
+ MX3_PWMCR_EN;
+
+ if (state->polarity == PWM_POLARITY_INVERSED)
+ cr |= MX3_PWMCR_POUTC;
+
+ writel(cr, imx->mmio_base + MX3_PWMCR);
} else if (cstate.enabled) {
writel(0, imx->mmio_base + MX3_PWMCR);
@@ -234,6 +240,7 @@ static const struct pwm_ops imx_pwm_ops_v2 = {
};
struct imx_pwm_data {
+ bool polarity_supported;
const struct pwm_ops *ops;
};
@@ -242,6 +249,7 @@ static struct imx_pwm_data imx_pwm_data_v1 = {
};
static struct imx_pwm_data imx_pwm_data_v2 = {
+ .polarity_supported = true,
.ops = &imx_pwm_ops_v2,
};
@@ -283,6 +291,12 @@ static int imx_pwm_probe(struct platform_device *pdev)
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);
if (IS_ERR(imx->mmio_base))

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