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pwm: imx: Add polarity inversion support to i.MX's PWMv2

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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>
This commit is contained in:
Lukasz Majewski 2017-01-29 22:54:15 +01:00 committed by Thierry Reding
parent c322f45775
commit 326ed314fe
1 changed files with 19 additions and 5 deletions
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24
drivers/pwm/pwm-imx.c
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@ -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))