drm/bridge: ti-sn65dsi86: Make use of devm_pwmchip_alloc() function

This prepares the pwm driver of the ti-sn65dsi86 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.
Acked-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/a56cbaf049f5f23c0e0fe36b0799dd20189675e0.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/gpu/drm/bridge/ti-sn65dsi86.c

@@ -197,7 +197,7 @@ struct ti_sn65dsi86 {
 	DECLARE_BITMAP(gchip_output, SN_NUM_GPIOS);
 #endif
 #if defined(CONFIG_PWM)
-	struct pwm_chip			pchip;
+	struct pwm_chip			*pchip;
 	bool				pwm_enabled;
 	atomic_t			pwm_pin_busy;
 #endif
@@ -1374,7 +1374,7 @@ static void ti_sn_pwm_pin_release(struct ti_sn65dsi86 *pdata)
 
 static struct ti_sn65dsi86 *pwm_chip_to_ti_sn_bridge(struct pwm_chip *chip)
 {
-	return container_of(chip, struct ti_sn65dsi86, pchip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int ti_sn_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -1585,23 +1585,28 @@ static const struct pwm_ops ti_sn_pwm_ops = {
 static int ti_sn_pwm_probe(struct auxiliary_device *adev,
 			   const struct auxiliary_device_id *id)
 {
+	struct pwm_chip *chip;
 	struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
 
-	pdata->pchip.dev = &adev->dev;
-	pdata->pchip.ops = &ti_sn_pwm_ops;
-	pdata->pchip.npwm = 1;
-	pdata->pchip.of_xlate = of_pwm_single_xlate;
+	pdata->pchip = chip = devm_pwmchip_alloc(&adev->dev, 1, 0);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	pwmchip_set_drvdata(chip, pdata);
+
+	chip->ops = &ti_sn_pwm_ops;
+	chip->of_xlate = of_pwm_single_xlate;
 
 	devm_pm_runtime_enable(&adev->dev);
 
-	return pwmchip_add(&pdata->pchip);
+	return pwmchip_add(chip);
 }
 
 static void ti_sn_pwm_remove(struct auxiliary_device *adev)
 {
 	struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
 
-	pwmchip_remove(&pdata->pchip);
+	pwmchip_remove(pdata->pchip);
 
 	if (pdata->pwm_enabled)
 		pm_runtime_put_sync(&adev->dev);