pwm: imx27: Simplify helper function to enable and disable clocks

pwm_imx27_clk_prepare_enable() took a pointer to a struct pwm_chip just
to convert it to a struct pwm_imx27_chip pointer while all callers
already have the latter. Ditto for pwm_imx27_clk_disable_unprepare().

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-imx27.c

@@ -96,9 +96,8 @@ struct pwm_imx27_chip {
 
 #define to_pwm_imx27_chip(chip)	container_of(chip, struct pwm_imx27_chip, chip)
 
-static int pwm_imx27_clk_prepare_enable(struct pwm_chip *chip)
+static int pwm_imx27_clk_prepare_enable(struct pwm_imx27_chip *imx)
 {
-	struct pwm_imx27_chip *imx = to_pwm_imx27_chip(chip);
 	int ret;
 
 	ret = clk_prepare_enable(imx->clk_ipg);
@@ -114,10 +113,8 @@ static int pwm_imx27_clk_prepare_enable(struct pwm_chip *chip)
 	return 0;
 }
 
-static void pwm_imx27_clk_disable_unprepare(struct pwm_chip *chip)
+static void pwm_imx27_clk_disable_unprepare(struct pwm_imx27_chip *imx)
 {
-	struct pwm_imx27_chip *imx = to_pwm_imx27_chip(chip);
-
 	clk_disable_unprepare(imx->clk_per);
 	clk_disable_unprepare(imx->clk_ipg);
 }
@@ -130,7 +127,7 @@ static void pwm_imx27_get_state(struct pwm_chip *chip,
 	u64 tmp;
 	int ret;
 
-	ret = pwm_imx27_clk_prepare_enable(chip);
+	ret = pwm_imx27_clk_prepare_enable(imx);
 	if (ret < 0)
 		return;
 
@@ -175,7 +172,7 @@ static void pwm_imx27_get_state(struct pwm_chip *chip,
 	state->duty_cycle = DIV_ROUND_CLOSEST_ULL(tmp, pwm_clk);
 
 	if (!state->enabled)
-		pwm_imx27_clk_disable_unprepare(chip);
+		pwm_imx27_clk_disable_unprepare(imx);
 }
 
 static void pwm_imx27_sw_reset(struct pwm_chip *chip)
@@ -259,7 +256,7 @@ static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (cstate.enabled) {
 		pwm_imx27_wait_fifo_slot(chip, pwm);
 	} else {
-		ret = pwm_imx27_clk_prepare_enable(chip);
+		ret = pwm_imx27_clk_prepare_enable(imx);
 		if (ret)
 			return ret;
 
@@ -290,7 +287,7 @@ static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	writel(cr, imx->mmio_base + MX3_PWMCR);
 
 	if (!state->enabled)
-		pwm_imx27_clk_disable_unprepare(chip);
+		pwm_imx27_clk_disable_unprepare(imx);
 
 	return 0;
 }
@@ -361,7 +358,7 @@ static int pwm_imx27_remove(struct platform_device *pdev)
 
 	imx = platform_get_drvdata(pdev);
 
-	pwm_imx27_clk_disable_unprepare(&imx->chip);
+	pwm_imx27_clk_disable_unprepare(imx);
 
 	return pwmchip_remove(&imx->chip);
 }