[PATCH 14/18] pwm: mxs: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-mxs 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.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 drivers/pwm/pwm-mxs.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-mxs.c b/drivers/pwm/pwm-mxs.c
index 766dbc58dad8..62f8ab499d44 100644
--- a/drivers/pwm/pwm-mxs.c
+++ b/drivers/pwm/pwm-mxs.c
@@ -37,12 +37,14 @@ static const u8 cdiv_shift[PERIOD_CDIV_MAX] = {
 };
 
 struct mxs_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	void __iomem *base;
 };
 
-#define to_mxs_pwm_chip(_chip) container_of(_chip, struct mxs_pwm_chip, chip)
+static inline struct mxs_pwm_chip *to_mxs_pwm_chip(struct pwm_chip *chip)
+{
+	return pwmchip_priv(chip);
+}
 
 static int mxs_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			 const struct pwm_state *state)
@@ -121,12 +123,14 @@ static const struct pwm_ops mxs_pwm_ops = {
 static int mxs_pwm_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	struct pwm_chip *chip;
 	struct mxs_pwm_chip *mxs;
 	int ret;
 
-	mxs = devm_kzalloc(&pdev->dev, sizeof(*mxs), GFP_KERNEL);
-	if (!mxs)
+	chip = devm_pwmchip_alloc(&pdev->dev, sizeof(*mxs));
+	if (!chip)
 		return -ENOMEM;
+	mxs = to_mxs_pwm_chip(chip);
 
 	mxs->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mxs->base))
@@ -136,10 +140,9 @@ static int mxs_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(mxs->clk))
 		return PTR_ERR(mxs->clk);
 
-	mxs->chip.dev = &pdev->dev;
-	mxs->chip.ops = &mxs_pwm_ops;
+	chip->ops = &mxs_pwm_ops;
 
-	ret = of_property_read_u32(np, "fsl,pwm-number", &mxs->chip.npwm);
+	ret = of_property_read_u32(np, "fsl,pwm-number", &chip->npwm);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to get pwm number: %d\n", ret);
 		return ret;
@@ -150,7 +153,7 @@ static int mxs_pwm_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret, "failed to reset PWM\n");
 
-	ret = devm_pwmchip_add(&pdev->dev, &mxs->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add pwm chip %d\n", ret);
 		return ret;
-- 
2.39.2