[nrf fromtree] Revert "drivers: ieee802154: nrf: cache radio channel"

This reverts commit 780b128.
"drivers: ieee802154: nrf: cache radio channel"

Implementation affected RCP devices in openthread as MAC layer
does not call `Receive()` functions after transmit is done.

Additionally, after sending a frame to a new channel (for example
while discovery operation), radio switches to RX state immediately
after TX, but continues to listen on old channel for about 5ms,
until MAC layer calls `Receive` operation, forcing to change the
channel.

Signed-off-by: Maciej Baczmanski <maciej.baczmanski@nordicsemi.no>
(cherry picked from commit dbe74b3)

drivers/ieee802154/ieee802154_nrf5.c

@@ -255,8 +255,6 @@ static int nrf5_cca(const struct device *dev)
 {
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
 
-	nrf_802154_channel_set(nrf5_data.channel);
-
 	if (!nrf_802154_cca()) {
 		LOG_DBG("CCA failed");
 		return -EBUSY;
@@ -282,7 +280,7 @@ static int nrf5_set_channel(const struct device *dev, uint16_t channel)
 		return channel < 11 ? -ENOTSUP : -EINVAL;
 	}
 
-	nrf5_data.channel = channel;
+	nrf_802154_channel_set(channel);
 
 	return 0;
 }
@@ -295,8 +293,6 @@ static int nrf5_energy_scan_start(const struct device *dev,
 
 	ARG_UNUSED(dev);
 
-	nrf_802154_channel_set(nrf5_data.channel);
-
 	if (nrf5_data.energy_scan_done == NULL) {
 		nrf5_data.energy_scan_done = done_cb;
 
@@ -462,10 +458,6 @@ static bool nrf5_tx_immediate(struct net_pkt *pkt, uint8_t *payload, bool cca)
 			.use_metadata_value = true,
 			.power = nrf5_data.txpwr,
 		},
-		.tx_channel = {
-			.use_metadata_value = true,
-			.channel = nrf5_data.channel,
-		},
 	};
 
 	return nrf_802154_transmit_raw(payload, &metadata);
@@ -483,10 +475,6 @@ static bool nrf5_tx_csma_ca(struct net_pkt *pkt, uint8_t *payload)
 			.use_metadata_value = true,
 			.power = nrf5_data.txpwr,
 		},
-		.tx_channel = {
-			.use_metadata_value = true,
-			.channel = nrf5_data.channel,
-		},
 	};
 
 	return nrf_802154_transmit_csma_ca_raw(payload, &metadata);
@@ -526,7 +514,7 @@ static bool nrf5_tx_at(struct nrf5_802154_data *nrf5_radio, struct net_pkt *pkt,
 			.dynamic_data_is_set = net_pkt_ieee802154_mac_hdr_rdy(pkt),
 		},
 		.cca = cca,
-		.channel = nrf5_data.channel,
+		.channel = nrf_802154_channel_get(),
 		.tx_power = {
 			.use_metadata_value = true,
 			.power = nrf5_data.txpwr,
@@ -668,7 +656,6 @@ static int nrf5_start(const struct device *dev)
 	ARG_UNUSED(dev);
 
 	nrf_802154_tx_power_set(nrf5_data.txpwr);
-	nrf_802154_channel_set(nrf5_data.channel);
 
 	if (!nrf_802154_receive()) {
 		LOG_ERR("Failed to enter receive state");
@@ -713,7 +700,6 @@ static int nrf5_continuous_carrier(const struct device *dev)
 	ARG_UNUSED(dev);
 
 	nrf_802154_tx_power_set(nrf5_data.txpwr);
-	nrf_802154_channel_set(nrf5_data.channel);
 
 	if (!nrf_802154_continuous_carrier()) {
 		LOG_ERR("Failed to enter continuous carrier state");

drivers/ieee802154/ieee802154_nrf5.h

@@ -100,9 +100,6 @@ struct nrf5_802154_data {
 	/* The TX power in dBm. */
 	int8_t txpwr;
 
-	/* The radio channel. */
-	uint8_t channel;
-
 #if defined(CONFIG_NRF_802154_SER_HOST) && defined(CONFIG_IEEE802154_CSL_ENDPOINT)
 	/* The last configured value of CSL period in units of 10 symbols. */
 	uint32_t csl_period;