[nrf fromtree] tests: drivers: adc_accuracy: parametrize expected accuracy

On nrf boards expected accuracy from ref voltage is 64 instead of 32.

Signed-off-by: Bartlomiej Buczek <[email protected]>
(cherry picked from commit 557b5bd)

Author: nordic-babu

tests/drivers/adc/adc_accuracy_test/boards/ek_ra8m1.overlay

@@ -8,6 +8,7 @@
 	zephyr,user {
 		io-channels = <&adc0 0>;
 		reference_mv = <3300>;
+		expected_accuracy = <32>;
 	};
 };
 

tests/drivers/adc/adc_accuracy_test/boards/frdm_kl25z.overlay

@@ -8,6 +8,7 @@
 	zephyr,user {
 		io-channels = <&adc0 12>;
 		reference_mv = <1100>;
+		expected_accuracy = <32>;
 	};
 };
 

tests/drivers/adc/adc_accuracy_test/boards/frdm_mcxc242.overlay

@@ -10,6 +10,7 @@
 	zephyr,user {
 		io-channels = <&adc0 1>;
 		reference_mv = <1650>;
+		expected_accuracy = <32>;
 	};
 };
 

tests/drivers/adc/adc_accuracy_test/boards/nrf52840dk_nrf52840.overlay

@@ -9,6 +9,7 @@
 	zephyr,user {
 		io-channels = <&adc 0>;
 		reference_mv = <3000>;
+		expected_accuracy = <32>;
 	};
 };
 

tests/drivers/adc/adc_accuracy_test/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -8,6 +8,7 @@
 	zephyr,user {
 		io-channels = <&adc 0>;
 		reference_mv = <1800>;
+		expected_accuracy = <64>;
 	};
 };
 

tests/drivers/adc/adc_accuracy_test/boards/nrf54l15dk_nrf54l15_cpuapp.overlay

@@ -8,6 +8,7 @@
 	zephyr,user {
 		io-channels = <&adc 0>;
 		reference_mv = <1800>;
+		expected_accuracy = <64>;
 	};
 };
 

tests/drivers/adc/adc_accuracy_test/src/ref_volt.c

@@ -8,6 +8,7 @@
 #include <zephyr/ztest.h>
 
 #define REF_V DT_PROP(DT_PATH(zephyr_user), reference_mv)
+#define EXP_ACC DT_PROP(DT_PATH(zephyr_user), expected_accuracy)
 
 extern const struct adc_dt_spec *get_adc_channel(void);
 
@@ -31,7 +32,7 @@ static int test_ref_to_adc(void)
 	ret = adc_raw_to_millivolts_dt(adc_channel, &sample_buffer);
 	zassert_equal(ret, 0, "adc_raw_to_millivolts_dt() failed with code %d",
 		      ret);
-	zassert_within(sample_buffer, REF_V, 32,
+	zassert_within(sample_buffer, REF_V, EXP_ACC,
 		"Value %d mV read from ADC does not match expected range (%d mV).",
 		sample_buffer, REF_V);