rt2x00: rt2800: add antenna diversity for RT5370G

RT5370G has hardware RX antenna diversity like RT5390R.
Based on DPO_RT5572_LinuxSTA_2.6.1.3_20121022.tar.bz2 manufacturer driver:
https://d86o2zu8ugzlg.cloudfront.net/mediatek-craft/drivers/DPO_RT5572_LinuxSTA_2.6.1.3_20121022.tar.bz2

Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>
Cc: Gertjan van Wingerde <gwingerde@gmail.com>
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: wireless newbie <wnewbie72@gmail.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: linux wireless ml <linux-wireless@vger.kernel.org>
Signed-off-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ralink/rt2x00/rt2800.h

@@ -94,6 +94,7 @@
 #define REV_RT3390E			0x0211
 #define REV_RT3593E			0x0211
 #define REV_RT5390F			0x0502
+#define REV_RT5370G			0x0503
 #define REV_RT5390R			0x1502
 #define REV_RT5592C			0x0221
 

drivers/net/wireless/ralink/rt2x00/rt2800lib.c

@@ -6220,8 +6220,9 @@ static void rt2800_init_bbp_53xx(struct rt2x00_dev *rt2x00dev)
 		rt2800_register_write(rt2x00dev, GPIO_CTRL, reg);
 	}
 
-	/* This chip has hardware antenna diversity*/
-	if (rt2x00_rt_rev_gte(rt2x00dev, RT5390, REV_RT5390R)) {
+	/* These chips have hardware RX antenna diversity */
+	if (rt2x00_rt_rev_gte(rt2x00dev, RT5390, REV_RT5390R) ||
+	    rt2x00_rt_rev_gte(rt2x00dev, RT5390, REV_RT5370G)) {
 		rt2800_bbp_write(rt2x00dev, 150, 0); /* Disable Antenna Software OFDM */
 		rt2800_bbp_write(rt2x00dev, 151, 0); /* Disable Antenna Software CCK */
 		rt2800_bbp_write(rt2x00dev, 154, 0); /* Clear previously selected antenna */
@@ -8748,7 +8749,9 @@ static int rt2800_init_eeprom(struct rt2x00_dev *rt2x00dev)
 		rt2x00dev->default_ant.rx = ANTENNA_A;
 	}
 
-	if (rt2x00_rt_rev_gte(rt2x00dev, RT5390, REV_RT5390R)) {
+	/* These chips have hardware RX antenna diversity */
+	if (rt2x00_rt_rev_gte(rt2x00dev, RT5390, REV_RT5390R) ||
+	    rt2x00_rt_rev_gte(rt2x00dev, RT5390, REV_RT5370G)) {
 		rt2x00dev->default_ant.tx = ANTENNA_HW_DIVERSITY; /* Unused */
 		rt2x00dev->default_ant.rx = ANTENNA_HW_DIVERSITY; /* Unused */
 	}