pwm: crc: Make use of devm_pwmchip_alloc() function

This prepares the pwm-crc 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/bbe4896eabc240c678c66fabb6329f4e6cd04eda.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-crc.c

@@ -26,17 +26,15 @@
 
 /**
  * struct crystalcove_pwm - Crystal Cove PWM controller
- * @chip: the abstract pwm_chip structure.
  * @regmap: the regmap from the parent device.
  */
 struct crystalcove_pwm {
-	struct pwm_chip chip;
 	struct regmap *regmap;
 };
 
 static inline struct crystalcove_pwm *to_crc_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct crystalcove_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int crc_pwm_calc_clk_div(int period_ns)
@@ -160,22 +158,22 @@ static const struct pwm_ops crc_pwm_ops = {
 
 static int crystalcove_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct crystalcove_pwm *crc_pwm;
 	struct device *dev = pdev->dev.parent;
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 
-	crc_pwm = devm_kzalloc(&pdev->dev, sizeof(*crc_pwm), GFP_KERNEL);
-	if (!crc_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*crc_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	crc_pwm = to_crc_pwm(chip);
 
-	crc_pwm->chip.dev = &pdev->dev;
-	crc_pwm->chip.ops = &crc_pwm_ops;
-	crc_pwm->chip.npwm = 1;
+	chip->ops = &crc_pwm_ops;
 
 	/* get the PMIC regmap */
 	crc_pwm->regmap = pmic->regmap;
 
-	return devm_pwmchip_add(&pdev->dev, &crc_pwm->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 static struct platform_driver crystalcove_pwm_driver = {