[nrf fromlist] drivers: pwm: nrfx: Add idle output to PWM driver.

Fast PWM120 prevents GPIO from driving pin with low/high
state when PWM duty is 0% or 100%. Idleout feature needs to
be used. It can be configured when PWM is disabled and works
while it is enabled.

Upstream PR #: 83652

Signed-off-by: Michał Stasiak <[email protected]>

Author: mstasiaknordic

drivers/pwm/pwm_nrfx.c

@@ -233,7 +233,13 @@ static int pwm_nrfx_set_cycles(const struct device *dev, uint32_t channel,
 				out_level ^= 1;
 			}
 
+#if NRF_PWM_HAS_IDLEOUT
+			nrfx_pwm_stop(&config->pwm, true);
+			nrfy_pwm_channel_idle_set(config->pwm.p_reg, channel, out_level);
+			nrfy_pwm_enable(config->pwm.p_reg);
+#else
 			nrf_gpio_pin_write(psel, out_level);
+#endif
 		}
 
 		data->pwm_needed &= ~BIT(channel);