netdev - [PATCH RFC v2 2/9] net: phy: clean up PHY ID reading

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Message-Id: <E1jdtNf-00083L-EJ@rmk-PC.armlinux.org.uk>
Date:   Wed, 27 May 2020 11:33:51 +0100
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     Jeremy Linton <jeremy.linton@....com>,
        Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Subject: [PATCH RFC v2 2/9] net: phy: clean up PHY ID reading

Rearrange the code to read the PHY IDs, so we don't call get_phy_id()
only to immediately call get_phy_c45_ids().  Move that logic into
get_phy_device(), which results in better readability.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phy_device.c | 25 +++++++++----------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index e04284c4ebf8..0d6b6ca66216 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -756,29 +756,18 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
 }
 
 /**
- * get_phy_id - reads the specified addr for its ID.
+ * get_phy_c22_id - reads the specified addr for its clause 22 ID.
  * @bus: the target MII bus
  * @addr: PHY address on the MII bus
  * @phy_id: where to store the ID retrieved.
- * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
- * @c45_ids: where to store the c45 ID information.
- *
- * Description: In the case of a 802.3-c22 PHY, reads the ID registers
- *   of the PHY at @addr on the @bus, stores it in @phy_id and returns
- *   zero on success.
- *
- *   In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
- *   its return value is in turn returned.
  *
+ * Read the 802.3 clause 22 PHY ID from the PHY at @addr on the @bus.
+ * Return the PHY ID read from the PHY in @phy_id on successful access.
  */
-static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
-		      bool is_c45, struct phy_c45_device_ids *c45_ids)
+static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
 {
 	int phy_reg;
 
-	if (is_c45)
-		return get_phy_c45_ids(bus, addr, phy_id, c45_ids);
-
 	/* Grab the bits from PHYIR1, and put them in the upper half */
 	phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
 	if (phy_reg < 0) {
@@ -817,7 +806,11 @@ struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
 	c45_ids.devices_in_package = 0;
 	memset(c45_ids.device_ids, 0xff, sizeof(c45_ids.device_ids));
 
-	r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids);
+	if (is_c45)
+		r = get_phy_c45_ids(bus, addr, &phy_id, &c45_ids);
+	else
+		r = get_phy_c22_id(bus, addr, &phy_id);
+
 	if (r)
 		return ERR_PTR(r);
 
-- 
2.20.1