pwm: hibvt: Make use of devm_pwmchip_alloc() function

This prepares the pwm-hibvt driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Link: https://lore.kernel.org/r/7b12504b4128969bdc783bf2bff1ecc63b7c7bd4.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-hibvt.c

@@ -33,7 +33,6 @@
 #define PWM_DUTY_MASK       GENMASK(31, 0)
 
 struct hibvt_pwm_chip {
-	struct pwm_chip	chip;
 	struct clk *clk;
 	void __iomem *base;
 	struct reset_control *rstc;
@@ -65,7 +64,7 @@ static const struct hibvt_pwm_soc hi3559v100_soc_info = {
 
 static inline struct hibvt_pwm_chip *to_hibvt_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct hibvt_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void hibvt_pwm_set_bits(void __iomem *base, u32 offset,
@@ -191,12 +190,14 @@ static int hibvt_pwm_probe(struct platform_device *pdev)
 {
 	const struct hibvt_pwm_soc *soc =
 				of_device_get_match_data(&pdev->dev);
+	struct pwm_chip *chip;
 	struct hibvt_pwm_chip *hi_pwm_chip;
 	int ret, i;
 
-	hi_pwm_chip = devm_kzalloc(&pdev->dev, sizeof(*hi_pwm_chip), GFP_KERNEL);
-	if (hi_pwm_chip == NULL)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, soc->num_pwms, sizeof(*hi_pwm_chip));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	hi_pwm_chip = to_hibvt_pwm_chip(chip);
 
 	hi_pwm_chip->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(hi_pwm_chip->clk)) {
@@ -205,9 +206,7 @@ static int hibvt_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(hi_pwm_chip->clk);
 	}
 
-	hi_pwm_chip->chip.ops = &hibvt_pwm_ops;
-	hi_pwm_chip->chip.dev = &pdev->dev;
-	hi_pwm_chip->chip.npwm = soc->num_pwms;
+	chip->ops = &hibvt_pwm_ops;
 	hi_pwm_chip->soc = soc;
 
 	hi_pwm_chip->base = devm_platform_ioremap_resource(pdev, 0);
@@ -228,29 +227,28 @@ static int hibvt_pwm_probe(struct platform_device *pdev)
 	msleep(30);
 	reset_control_deassert(hi_pwm_chip->rstc);
 
-	ret = pwmchip_add(&hi_pwm_chip->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		clk_disable_unprepare(hi_pwm_chip->clk);
 		return ret;
 	}
 
-	for (i = 0; i < hi_pwm_chip->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		hibvt_pwm_set_bits(hi_pwm_chip->base, PWM_CTRL_ADDR(i),
 				PWM_KEEP_MASK, (0x1 << PWM_KEEP_SHIFT));
 	}
 
-	platform_set_drvdata(pdev, hi_pwm_chip);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 }
 
 static void hibvt_pwm_remove(struct platform_device *pdev)
 {
-	struct hibvt_pwm_chip *hi_pwm_chip;
-
-	hi_pwm_chip = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip);
 
-	pwmchip_remove(&hi_pwm_chip->chip);
+	pwmchip_remove(chip);
 
 	reset_control_assert(hi_pwm_chip->rstc);
 	msleep(30);