pwm: xilinx: Prepare removing pwm_chip from driver data

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

Link: https://lore.kernel.org/r/738b9929c1d13bde64050f8bbc4ce8d85f58cc7a.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-xilinx.c

@@ -214,6 +214,7 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct xilinx_timer_priv *priv;
+	struct pwm_chip *chip;
 	struct xilinx_pwm_device *xilinx_pwm;
 	u32 pwm_cells, one_timer, width;
 	void __iomem *regs;
@@ -228,8 +229,9 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 	xilinx_pwm = devm_kzalloc(dev, sizeof(*xilinx_pwm), GFP_KERNEL);
 	if (!xilinx_pwm)
 		return -ENOMEM;
-	platform_set_drvdata(pdev, xilinx_pwm);
 	priv = &xilinx_pwm->priv;
+	chip = &xilinx_pwm->chip;
+	platform_set_drvdata(pdev, chip);
 
 	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
@@ -278,10 +280,10 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, ret, "Clock enable failed\n");
 	clk_rate_exclusive_get(priv->clk);
 
-	xilinx_pwm->chip.dev = dev;
-	xilinx_pwm->chip.ops = &xilinx_pwm_ops;
-	xilinx_pwm->chip.npwm = 1;
-	ret = pwmchip_add(&xilinx_pwm->chip);
+	chip->dev = dev;
+	chip->ops = &xilinx_pwm_ops;
+	chip->npwm = 1;
+	ret = pwmchip_add(chip);
 	if (ret) {
 		clk_rate_exclusive_put(priv->clk);
 		clk_disable_unprepare(priv->clk);
@@ -293,11 +295,12 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 
 static void xilinx_pwm_remove(struct platform_device *pdev)
 {
-	struct xilinx_pwm_device *xilinx_pwm = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct xilinx_timer_priv *priv = xilinx_pwm_chip_to_priv(chip);
 
-	pwmchip_remove(&xilinx_pwm->chip);
-	clk_rate_exclusive_put(xilinx_pwm->priv.clk);
-	clk_disable_unprepare(xilinx_pwm->priv.clk);
+	pwmchip_remove(chip);
+	clk_rate_exclusive_put(priv->clk);
+	clk_disable_unprepare(priv->clk);
 }
 
 static const struct of_device_id xilinx_pwm_of_match[] = {