pwm: stm32: Make use of devm_pwmchip_alloc() function

This prepares the pwm-stm32 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/59e5dfff2b878cc8590e286572672e4f10e35380.1707900770.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <[email protected]>

diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 1440b706ee57b33b1955ec4fdc87c8c3ed30f4b1..0c028d17c07523a76957f312fd660f0e64554d04 100644 (file)
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -27,7 +27,6 @@ struct stm32_breakinput {
 };
 
 struct stm32_pwm {
-       struct pwm_chip chip;
        struct mutex lock; /* protect pwm config/enable */
        struct clk *clk;
        struct regmap *regmap;
@@ -40,7 +39,7 @@ struct stm32_pwm {
 
 static inline struct stm32_pwm *to_stm32_pwm_dev(struct pwm_chip *chip)
 {
-       return container_of(chip, struct stm32_pwm, chip);
+       return pwmchip_get_drvdata(chip);
 }
 
 static u32 active_channels(struct stm32_pwm *dev)
@@ -632,14 +631,16 @@ static int stm32_pwm_probe(struct platform_device *pdev)
        struct stm32_timers *ddata = dev_get_drvdata(pdev->dev.parent);
        struct pwm_chip *chip;
        struct stm32_pwm *priv;
-       unsigned int num_enabled;
+       unsigned int npwm, num_enabled;
        unsigned int i;
        int ret;
 
-       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-       if (!priv)
-               return -ENOMEM;
-       chip = &priv->chip;
+       npwm = stm32_pwm_detect_channels(ddata->regmap, &num_enabled);
+
+       chip = devm_pwmchip_alloc(dev, npwm, sizeof(*priv));
+       if (IS_ERR(chip))
+               return PTR_ERR(chip);
+       priv = to_stm32_pwm_dev(chip);
 
        mutex_init(&priv->lock);
        priv->regmap = ddata->regmap;
@@ -655,9 +656,7 @@ static int stm32_pwm_probe(struct platform_device *pdev)
 
        stm32_pwm_detect_complementary(priv);
 
-       chip->dev = dev;
        chip->ops = &stm32pwm_ops;
-       chip->npwm = stm32_pwm_detect_channels(ddata->regmap, &num_enabled);
 
        /* Initialize clock refcount to number of enabled PWM channels. */
        for (i = 0; i < num_enabled; i++)