[PATCH v2 rtw-next 7/7] wifi: rtw89: 8922d: add set channel of RF part

[Ping-Ke Shih <pkshih@realtek.com>]

The set channel of RF part is to configure channel and bandwidth on a
register. The function to encode channel and bandwidth into register
value will be implemented by coming patch.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
v2: no change
---
 drivers/net/wireless/realtek/rtw89/rtw8922d.c |  1 +
 .../net/wireless/realtek/rtw89/rtw8922d_rfk.c | 33 +++++++++++++++++++
 .../net/wireless/realtek/rtw89/rtw8922d_rfk.h | 14 ++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.c
 create mode 100644 drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.h

diff --git a/drivers/net/wireless/realtek/rtw89/rtw8922d.c b/drivers/net/wireless/realtek/rtw89/rtw8922d.c
index cae92e2abd85..1b5fc6c9ea85 100644
--- a/drivers/net/wireless/realtek/rtw89/rtw8922d.c
+++ b/drivers/net/wireless/realtek/rtw89/rtw8922d.c
@@ -8,6 +8,7 @@
 #include "phy.h"
 #include "reg.h"
 #include "rtw8922d.h"
+#include "rtw8922d_rfk.h"
 #include "util.h"
 
 #define RTW8922D_FW_FORMAT_MAX 0
diff --git a/drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.c b/drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.c
new file mode 100644
index 000000000000..6b35d196cb81
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright(c) 2026  Realtek Corporation
+ */
+
+#include "phy.h"
+#include "reg.h"
+#include "rtw8922d.h"
+#include "rtw8922d_rfk.h"
+
+static
+void rtw8922d_ctl_band_ch_bw(struct rtw89_dev *rtwdev, enum rtw89_phy_idx phy,
+			     const struct rtw89_chan *chan)
+{
+	u8 synpath;
+	u32 rf18;
+
+	synpath = rtw89_phy_get_syn_sel(rtwdev, phy);
+	rf18 = rtw89_chip_chan_to_rf18_val(rtwdev, chan);
+
+	rtw89_write_rf(rtwdev, synpath, RR_RSV1, RFREG_MASK, 0x0);
+	rtw89_write_rf(rtwdev, synpath, RR_MOD, RFREG_MASK, 0x30000);
+	rtw89_write_rf(rtwdev, synpath, RR_CFGCH, RFREG_MASK, rf18);
+	fsleep(400);
+	rtw89_write_rf(rtwdev, synpath, RR_RSV1, RFREG_MASK, 0x1);
+	rtw89_write_rf(rtwdev, synpath, RR_CFGCH_V1, RFREG_MASK, rf18);
+}
+
+void rtw8922d_set_channel_rf(struct rtw89_dev *rtwdev,
+			     const struct rtw89_chan *chan,
+			     enum rtw89_phy_idx phy_idx)
+{
+	rtw8922d_ctl_band_ch_bw(rtwdev, phy_idx, chan);
+}
diff --git a/drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.h b/drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.h
new file mode 100644
index 000000000000..03af1f0497ac
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw89/rtw8922d_rfk.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/* Copyright(c) 2026  Realtek Corporation
+ */
+
+#ifndef __RTW89_8922D_RFK_H__
+#define __RTW89_8922D_RFK_H__
+
+#include "core.h"
+
+void rtw8922d_set_channel_rf(struct rtw89_dev *rtwdev,
+			     const struct rtw89_chan *chan,
+			     enum rtw89_phy_idx phy_idx);
+
+#endif
-- 
2.25.1