pwm: sl28cpld: fix getting driver data in pwm callbacks

Currently .get_state() and .apply() use dev_get_drvdata() on the struct
device related to the pwm chip.  This only works after .probe() called
platform_set_drvdata() which in this driver happens only after
pwmchip_add() and so comes possibly too late.

Instead of setting the driver data earlier use the traditional
container_of approach as this way the driver data is conceptually and
computational nearer.

Fixes: 9db33d221efc ("pwm: Add support for sl28cpld PWM controller")
Tested-by: Michael Walle <michael@walle.cc>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/pwm/pwm-sl28cpld.c b/drivers/pwm/pwm-sl28cpld.c
index 5046b6b..b4c651f 100644 (file)
--- a/drivers/pwm/pwm-sl28cpld.c
+++ b/drivers/pwm/pwm-sl28cpld.c
@@ -84,12 +84,14 @@ struct sl28cpld_pwm {
        struct regmap *regmap;
        u32 offset;
 };
+#define sl28cpld_pwm_from_chip(_chip) \
+       container_of(_chip, struct sl28cpld_pwm, pwm_chip)
 
 static void sl28cpld_pwm_get_state(struct pwm_chip *chip,
                                   struct pwm_device *pwm,
                                   struct pwm_state *state)
 {
-       struct sl28cpld_pwm *priv = dev_get_drvdata(chip->dev);
+       struct sl28cpld_pwm *priv = sl28cpld_pwm_from_chip(chip);
        unsigned int reg;
        int prescaler;
 
@@ -118,7 +120,7 @@ static void sl28cpld_pwm_get_state(struct pwm_chip *chip,
 static int sl28cpld_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
                              const struct pwm_state *state)
 {
-       struct sl28cpld_pwm *priv = dev_get_drvdata(chip->dev);
+       struct sl28cpld_pwm *priv = sl28cpld_pwm_from_chip(chip);
        unsigned int cycle, prescaler;
        bool write_duty_cycle_first;
        int ret;