[nrf fromlist] drivers: nordic: support pin retention for AIN

Devices which use AIN (COMP, LPCOMP, SAADC) don't use pinctrl to
configure their pins, thus pinctrl can't manage pin retention like
is done for other devices. Thus for now, add manually disabling
pin retention to the drivers.

In the future, we should probably use pinctrl for these inputs
as well, at which point this commit can be reverted.

Upstream PR #: 97452

Signed-off-by: Bjarki Arge Andreasen <[email protected]>

Author: bjarki-andreasen

drivers/adc/adc_nrfx_saadc.c

@@ -16,6 +16,7 @@
 #include <zephyr/pm/device_runtime.h>
 #include <dmm.h>
 #include <soc.h>
+#include <hal/nrf_gpio.h>
 
 LOG_MODULE_REGISTER(adc_nrfx_saadc, CONFIG_ADC_LOG_LEVEL);
 
@@ -200,6 +201,10 @@ static int input_assign(nrf_saadc_input_t *pin_p,
 
 	*pin_p = saadc_psels[channel_cfg->input_positive];
 
+#if NRF_GPIO_HAS_RETENTION_SETCLEAR
+	nrf_gpio_pin_retain_disable(saadc_psels[channel_cfg->input_positive]);
+#endif
+
 	if (channel_cfg->differential) {
 		if (channel_cfg->input_negative > ARRAY_SIZE(saadc_psels) ||
 		    (IS_ENABLED(CONFIG_NRF_PLATFORM_HALTIUM) &&
@@ -212,6 +217,11 @@ static int input_assign(nrf_saadc_input_t *pin_p,
 		*pin_n = channel_cfg->input_negative == NRF_SAADC_GND ?
 			 NRF_SAADC_INPUT_DISABLED :
 			 saadc_psels[channel_cfg->input_negative];
+
+#if NRF_GPIO_HAS_RETENTION_SETCLEAR
+		nrf_gpio_pin_retain_disable(saadc_psels[channel_cfg->input_negative]);
+#endif
+
 	} else {
 		*pin_n = NRF_SAADC_INPUT_DISABLED;
 	}

drivers/comparator/comparator_nrf_comp.c

@@ -5,6 +5,7 @@
  */
 
 #include <nrfx_comp.h>
+#include <hal/nrf_gpio.h>
 
 #include <zephyr/drivers/comparator/nrf_comp.h>
 #include <zephyr/kernel.h>
@@ -249,6 +250,11 @@ static int shim_nrf_comp_psel_to_nrf(uint8_t shim,
 	}
 
 	*nrf = shim_nrf_comp_ain_map[shim];
+
+#if NRF_GPIO_HAS_RETENTION_SETCLEAR
+	nrf_gpio_pin_retain_disable(shim_nrf_comp_ain_map[shim]);
+#endif
+
 	return 0;
 }
 #else

drivers/comparator/comparator_nrf_lpcomp.c

@@ -5,6 +5,7 @@
  */
 
 #include <nrfx_lpcomp.h>
+#include <hal/nrf_gpio.h>
 
 #include <zephyr/drivers/comparator/nrf_lpcomp.h>
 #include <zephyr/kernel.h>
@@ -142,6 +143,11 @@ static int shim_nrf_lpcomp_psel_to_nrf(uint8_t shim,
 	}
 
 	*nrf = shim_nrf_comp_ain_map[shim];
+
+#if NRF_GPIO_HAS_RETENTION_SETCLEAR
+	nrf_gpio_pin_retain_disable(shim_nrf_comp_ain_map[shim]);
+#endif
+
 	return 0;
 }
 #else