[nrf fromtree] net: openthread: radio: Add setting channel in diag mode

Add possibility to set channel in diag mode by implementing
`platformRadioChannelSet` API.

Signed-off-by: Maciej Baczmanski <[email protected]>
(cherry picked from commit 712da72)

Author: maciejbaczmanski

modules/openthread/platform/diag.c

@@ -104,8 +104,8 @@ bool otPlatDiagModeGet(void)
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-	ARG_UNUSED(aChannel);
 	sChannel = aChannel;
+	platformRadioChannelSet(aChannel);
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)

modules/openthread/platform/platform-zephyr.h

@@ -70,6 +70,16 @@ void platformUartPanic(void);
  */
 uint16_t platformRadioChannelGet(otInstance *aInstance);
 
+#if defined(CONFIG_OPENTHREAD_DIAG)
+/**
+ * Set channel on radio driver.
+ *
+ * @param[in]  aChannel  The channel that the radio driver should use for operation.
+ *
+ */
+void platformRadioChannelSet(uint8_t aChannel);
+#endif /* CONFIG_OPENTHREAD_DIAG */
+
 #if defined(CONFIG_IEEE802154_CARRIER_FUNCTIONS)
 /**
  * Start/stop continuous carrier wave transmission.

modules/openthread/platform/radio.c

@@ -708,6 +708,13 @@ uint16_t platformRadioChannelGet(otInstance *aInstance)
 	return channel;
 }
 
+#if defined(CONFIG_OPENTHREAD_DIAG)
+void platformRadioChannelSet(uint8_t aChannel)
+{
+	channel = aChannel;
+}
+#endif
+
 void otPlatRadioSetPanId(otInstance *aInstance, uint16_t aPanId)
 {
 	ARG_UNUSED(aInstance);