pwm: omap-dmtimer: Prepare removing pwm_chip from driver data

This prepares the driver for further changes that will drop struct
pwm_chip chip from struct pwm_omap_dmtimer_chip. Use the pwm_chip as
driver data instead of the pwm_omap_dmtimer_chip to get access to the
pwm_chip in pwm_omap_dmtimer_remove() without using omap->chip.

Link: https://lore.kernel.org/r/809672026f3d583ba4fc4bd92b525951df172106.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-omap-dmtimer.c

@@ -311,6 +311,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 	struct dmtimer_platform_data *timer_pdata;
 	const struct omap_dm_timer_ops *pdata;
 	struct platform_device *timer_pdev;
+	struct pwm_chip *chip;
 	struct pwm_omap_dmtimer_chip *omap;
 	struct omap_dm_timer *dm_timer;
 	struct device_node *timer;
@@ -373,6 +374,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 		ret = -ENOMEM;
 		goto err_alloc_omap;
 	}
+	chip = &omap->chip;
 
 	omap->pdata = pdata;
 	omap->dm_timer = dm_timer;
@@ -392,11 +394,11 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 	if (!of_property_read_u32(pdev->dev.of_node, "ti,clock-source", &v))
 		omap->pdata->set_source(omap->dm_timer, v);
 
-	omap->chip.dev = &pdev->dev;
-	omap->chip.ops = &pwm_omap_dmtimer_ops;
-	omap->chip.npwm = 1;
+	chip->dev = &pdev->dev;
+	chip->ops = &pwm_omap_dmtimer_ops;
+	chip->npwm = 1;
 
-	ret = pwmchip_add(&omap->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register PWM\n");
 		goto err_pwmchip_add;
@@ -404,7 +406,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 
 	of_node_put(timer);
 
-	platform_set_drvdata(pdev, omap);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 
@@ -432,9 +434,10 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 
 static void pwm_omap_dmtimer_remove(struct platform_device *pdev)
 {
-	struct pwm_omap_dmtimer_chip *omap = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);
 
-	pwmchip_remove(&omap->chip);
+	pwmchip_remove(chip);
 
 	if (pm_runtime_active(&omap->dm_timer_pdev->dev))
 		omap->pdata->stop(omap->dm_timer);