refactor(drivers/marvell/comphy-3700): rename Idle Sync Enable register constants

According to the functional specification, the register at offset 0x48
is called Idle Sync Enable, not Unit Control or some such.

Rename the constants.

Only bit 12 of this register is defined, all other bits are reserved.
But for some reason the code needs the default value of the other bits,
so we also rename constant UNIT_CTRL_DEFAULT_VALUE to
IDLE_SYNC_EN_DEFAULT_VALUE.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Change-Id: Ia4f80f945a8f31c190cd9a1875d50d892e72825f
diff --git a/drivers/marvell/comphy/phy-comphy-3700.c b/drivers/marvell/comphy/phy-comphy-3700.c
index f8413f8..5fd5f83 100644
--- a/drivers/marvell/comphy/phy-comphy-3700.c
+++ b/drivers/marvell/comphy/phy-comphy-3700.c
@@ -725,8 +725,8 @@
 	/*
 	 * 9. Enable idle sync
 	 */
-	data = UNIT_CTRL_DEFAULT_VALUE | IDLE_SYNC_EN;
-	usb3_reg_set(reg_base, COMPHY_UNIT_CTRL, data, REG_16_BIT_MASK);
+	data = IDLE_SYNC_EN_DEFAULT_VALUE | IDLE_SYNC_EN;
+	usb3_reg_set(reg_base, COMPHY_IDLE_SYNC_EN, data, REG_16_BIT_MASK);
 
 	/*
 	 * 10. Enable the output of 500M clock
@@ -839,8 +839,8 @@
 		   CFG_PM_RXDLOZ_WAIT_MASK));
 
 	/* 5. Enable idle sync */
-	reg_set16(UNIT_CTRL_ADDR(PCIE) + COMPHY_SD_ADDR,
-		  UNIT_CTRL_DEFAULT_VALUE | IDLE_SYNC_EN, REG_16_BIT_MASK);
+	reg_set16(IDLE_SYNC_EN_ADDR(PCIE) + COMPHY_SD_ADDR,
+		  IDLE_SYNC_EN_DEFAULT_VALUE | IDLE_SYNC_EN, REG_16_BIT_MASK);
 
 	/* 6. Enable the output of 100M/125M/500M clock */
 	reg_set16(MISC_REG0_ADDR(PCIE) + COMPHY_SD_ADDR,
diff --git a/drivers/marvell/comphy/phy-comphy-3700.h b/drivers/marvell/comphy/phy-comphy-3700.h
index 6fba60b..214c6f0 100644
--- a/drivers/marvell/comphy/phy-comphy-3700.h
+++ b/drivers/marvell/comphy/phy-comphy-3700.h
@@ -117,10 +117,10 @@
 #define COMPHY_GEN3_SET2		0x3f
 #define GEN3_SET2_ADDR(unit)		(COMPHY_GEN3_SET2 * PHY_SHFT(unit))
 
-#define COMPHY_UNIT_CTRL		0x48
-#define UNIT_CTRL_ADDR(unit)		(COMPHY_UNIT_CTRL * PHY_SHFT(unit))
+#define COMPHY_IDLE_SYNC_EN		0x48
+#define IDLE_SYNC_EN_ADDR(unit)		(COMPHY_IDLE_SYNC_EN * PHY_SHFT(unit))
 #define IDLE_SYNC_EN			BIT(12)
-#define UNIT_CTRL_DEFAULT_VALUE		0x60
+#define IDLE_SYNC_EN_DEFAULT_VALUE	0x60
 
 #define COMPHY_MISC_REG0		0x4F
 #define MISC_REG0_ADDR(unit)		(COMPHY_MISC_REG0 * PHY_SHFT(unit))