pwm: stm32: Make ch parameter unsigned

The channel parameter is only ever set to pwm->hwpwm.
Make it unsigned int as well.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-stm32.c

@@ -308,7 +308,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
 	return ret;
 }
 
-static int stm32_pwm_config(struct stm32_pwm *priv, int ch,
+static int stm32_pwm_config(struct stm32_pwm *priv, unsigned int ch,
 			    int duty_ns, int period_ns)
 {
 	unsigned long long prd, div, dty;
@@ -371,7 +371,7 @@ static int stm32_pwm_config(struct stm32_pwm *priv, int ch,
 	return 0;
 }
 
-static int stm32_pwm_set_polarity(struct stm32_pwm *priv, int ch,
+static int stm32_pwm_set_polarity(struct stm32_pwm *priv, unsigned int ch,
 				  enum pwm_polarity polarity)
 {
 	u32 mask;
@@ -386,7 +386,7 @@ static int stm32_pwm_set_polarity(struct stm32_pwm *priv, int ch,
 	return 0;
 }
 
-static int stm32_pwm_enable(struct stm32_pwm *priv, int ch)
+static int stm32_pwm_enable(struct stm32_pwm *priv, unsigned int ch)
 {
 	u32 mask;
 	int ret;
@@ -411,7 +411,7 @@ static int stm32_pwm_enable(struct stm32_pwm *priv, int ch)
 	return 0;
 }
 
-static void stm32_pwm_disable(struct stm32_pwm *priv, int ch)
+static void stm32_pwm_disable(struct stm32_pwm *priv, unsigned int ch)
 {
 	u32 mask;