drivers: sensors: Add SENSOR_CHAN_FREQUENCY channel

Add new SENSOR_CHAN_FREQUENCY constant to allow implement sensors that
output frequency values in Hertz.

Signed-off-by: Gerson Fernando Budke <gerson.budke@ossystems.com.br>

drivers/sensor/sensor_shell.c

@@ -88,6 +88,7 @@ static const char *sensor_channel_name[SENSOR_CHAN_COMMON_COUNT] = {
 	[SENSOR_CHAN_POS_DZ] = "pos_dz",
 	[SENSOR_CHAN_POS_DXYZ] = "pos_dxyz",
 	[SENSOR_CHAN_RPM] = "rpm",
+	[SENSOR_CHAN_FREQUENCY] = "frequency",
 	[SENSOR_CHAN_GAUGE_VOLTAGE] = "gauge_voltage",
 	[SENSOR_CHAN_GAUGE_AVG_CURRENT] = "gauge_avg_current",
 	[SENSOR_CHAN_GAUGE_STDBY_CURRENT] = "gauge_stdby_current",

include/zephyr/drivers/sensor.h

@@ -156,6 +156,9 @@ enum sensor_channel {
 	/** Revolutions per minute, in RPM. */
 	SENSOR_CHAN_RPM,
 
+	/** Frequency, in Hz. */
+	SENSOR_CHAN_FREQUENCY,
+
 	/** Voltage, in volts **/
 	SENSOR_CHAN_GAUGE_VOLTAGE,
 	/** Average current, in amps **/

samples/sensor/sensor_shell/pytest/test_sensor_shell.py

@@ -37,7 +37,7 @@ def test_sensor_shell_attr_get(shell: Shell):
     lines = shell.exec_command('sensor attr_get sensor@0 co2 sampling_frequency')
     assert any(['sensor@0(channel=co2, attr=sampling_frequency)' in line for line in lines]), 'expected response not found'
 
-    lines = shell.exec_command('sensor attr_get sensor@1 53 3')
+    lines = shell.exec_command('sensor attr_get sensor@1 54 3')
     assert any(['sensor@1(channel=gauge_state_of_health, attr=slope_th)' in line for line in lines]), 'expected response not found'
 
     logger.info('response is valid')
@@ -50,7 +50,7 @@ def test_sensor_shell_attr_set(shell: Shell):
     expected_line = 'sensor@0 channel=co2, attr=sampling_frequency set to value=1'
     assert any([expected_line in line for line in lines]), 'expected response not found'
 
-    lines = shell.exec_command('sensor attr_set sensor@1 53 3 1')
+    lines = shell.exec_command('sensor attr_set sensor@1 54 3 1')
     expected_line = 'sensor@1 channel=gauge_state_of_health, attr=slope_th set to value=1'
     assert any([expected_line in line for line in lines]), 'expected response not found'