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Commit 326ed314 authored by Lukasz Majewski's avatar Lukasz Majewski Committed by Thierry Reding
Browse files

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: default avatarBhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Signed-off-by: default avatarLukasz Majewski <l.majewski@majess.pl>
Reviewed-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent c322f457

drivers/pwm/pwm-imx.c

+19 −5
Original line number Diff line number Diff line
@@ -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) |

		cr = 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);

		     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))