pwm: bcm-kona: Make use of devm_pwmchip_alloc() function

This prepares the pwm-bcm-kona 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/b50fe94dc72af602e7061839b24f48af6e005ef8.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-bcm-kona.c

@@ -56,14 +56,13 @@
 #define DUTY_CYCLE_HIGH_MAX			0x00ffffff
 
 struct kona_pwmc {
-	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *clk;
 };
 
 static inline struct kona_pwmc *to_kona_pwmc(struct pwm_chip *chip)
 {
-	return container_of(chip, struct kona_pwmc, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -273,18 +272,18 @@ static const struct pwm_ops kona_pwm_ops = {
 
 static int kona_pwmc_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct kona_pwmc *kp;
 	unsigned int chan;
 	unsigned int value = 0;
 	int ret = 0;
 
-	kp = devm_kzalloc(&pdev->dev, sizeof(*kp), GFP_KERNEL);
-	if (kp == NULL)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 6, sizeof(*kp));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	kp = to_kona_pwmc(chip);
 
-	kp->chip.dev = &pdev->dev;
-	kp->chip.ops = &kona_pwm_ops;
-	kp->chip.npwm = 6;
+	chip->ops = &kona_pwm_ops;
 
 	kp->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(kp->base))
@@ -304,14 +303,14 @@ static int kona_pwmc_probe(struct platform_device *pdev)
 	}
 
 	/* Set push/pull for all channels */
-	for (chan = 0; chan < kp->chip.npwm; chan++)
+	for (chan = 0; chan < chip->npwm; chan++)
 		value |= (1 << PWM_CONTROL_TYPE_SHIFT(chan));
 
 	writel(value, kp->base + PWM_CONTROL_OFFSET);
 
 	clk_disable_unprepare(kp->clk);
 
-	ret = devm_pwmchip_add(&pdev->dev, &kp->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);