pwm: stm32: Don't open-code TIM_CCER_CCxE()

Instead of manually calculating the offset of the channels CCxE bit,
make use of the TIM_CCER_CCxE macro.

Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/7803f63b1310ddbd706f51f2f42d30b6dd786b03.1743844730.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: ukleinek

drivers/pwm/pwm-stm32.c

@@ -88,7 +88,7 @@ static int stm32_pwm_round_waveform_tohw(struct pwm_chip *chip,
 
 	rate = clk_get_rate(priv->clk);
 
-	if (active_channels(priv) & ~(1 << ch * 4)) {
+	if (active_channels(priv) & ~TIM_CCER_CCxE(ch + 1)) {
 		u64 arr;
 
 		/*