[PATCH V2 2/2] net: phy: Make phy_interface_is_rgmii a switch statement

[Nishanth Menon]

Recent commit 75d28899e3e9 ("net: phy: Synchronize PHY interface modes
with Linux") reordered the enum definitions. This exposed a problem in
range checking functions to identify the interface type. Though this
specific api was'nt impacted (all the RGMII definitions remained within
range), this experience should be used to never to have to face this
kind of challenge again.

While it is possible for the phy drivers to practically use the enum's
directly, drivers such as dp83867, dp83869, marvell, micrel_ksz90x1 etc
use the same.

Reported-by: Tom Rini <trini at konsulko.com>
Signed-off-by: Nishanth Menon <nm at ti.com>
---
Changes since V1:
* Switch update based on feedback from Marek

V1: https://lore.kernel.org/r/20230413180713.2922524-3-nm@ti.com
 include/phy.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/phy.h b/include/phy.h
index 51dadcf14478..600966bc8b20 100644
--- a/include/phy.h
+++ b/include/phy.h
@@ -361,8 +361,15 @@ int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id);
  */
 static inline bool phy_interface_is_rgmii(struct phy_device *phydev)
 {
-	return phydev->interface >= PHY_INTERFACE_MODE_RGMII &&
-		phydev->interface <= PHY_INTERFACE_MODE_RGMII_TXID;
+	switch (phydev->interface) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		return 1;
+	default:
+		return 0;
+	}
 }
 
 /**
-- 
2.40.0