pwm: jz4740: Change prototype of a helper to prepare further changes

This prepares the driver for further changes that will make it harder to
determine the pwm_chip from a given jz4740_pwm_chip. To just not have to
do that, rework jz4740_pwm_can_use_chn() to take a pwm_chip.

Link: https://lore.kernel.org/r/83b826f0bf58b93f26d3bc30b1a957f84eedf41a.1707900770.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index 3933418..de9e660 100644 (file)
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -35,13 +35,12 @@ static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
        return container_of(chip, struct jz4740_pwm_chip, chip);
 }
 
-static bool jz4740_pwm_can_use_chn(struct jz4740_pwm_chip *jz,
-                                  unsigned int channel)
+static bool jz4740_pwm_can_use_chn(struct pwm_chip *chip, unsigned int channel)
 {
        /* Enable all TCU channels for PWM use by default except channels 0/1 */
-       u32 pwm_channels_mask = GENMASK(jz->chip.npwm - 1, 2);
+       u32 pwm_channels_mask = GENMASK(chip->npwm - 1, 2);
 
-       device_property_read_u32(jz->chip.dev->parent,
+       device_property_read_u32(chip->dev->parent,
                                 "ingenic,pwm-channels-mask",
                                 &pwm_channels_mask);
 
@@ -55,7 +54,7 @@ static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
        char name[16];
        int err;
 
-       if (!jz4740_pwm_can_use_chn(jz, pwm->hwpwm))
+       if (!jz4740_pwm_can_use_chn(chip, pwm->hwpwm))
                return -EBUSY;
 
        snprintf(name, sizeof(name), "timer%u", pwm->hwpwm);