linux-kernel - [PATCH net-next v3 2/3] net: mdio: aspeed: Introduce read write function for c22 and c45

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Date:   Thu,  7 Apr 2022 09:17:37 +0800
From:   Potin Lai <potin.lai@...ntatw.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, davem@...emloft.net,
        Jakub Kicinski <kuba@...nel.org>,
        Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Patrick Williams <patrick@...cx.xyz>,
        Potin Lai <potin.lai@...ntatw.com>
Subject: [PATCH net-next v3 2/3] net: mdio: aspeed: Introduce read write function for c22 and c45

Add following additional functions to move out the implementation from
aspeed_mdio_read() and aspeed_mdio_write().

c22:
 - aspeed_mdio_read_c22()
 - aspeed_mdio_write_c22()

c45:
 - aspeed_mdio_read_c45()
 - aspeed_mdio_write_c45()

Signed-off-by: Potin Lai <potin.lai@...ntatw.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/mdio/mdio-aspeed.c | 46 +++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 12 deletions(-)

diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-aspeed.c
index f22be2f069e9..5becddb56117 100644
--- a/drivers/net/mdio/mdio-aspeed.c
+++ b/drivers/net/mdio/mdio-aspeed.c
@@ -79,17 +79,10 @@ static int aspeed_mdio_get_data(struct mii_bus *bus)
 	return FIELD_GET(ASPEED_MDIO_DATA_MIIRDATA, data);
 }
 
-static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
+static int aspeed_mdio_read_c22(struct mii_bus *bus, int addr, int regnum)
 {
 	int rc;
 
-	dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d\n", __func__, addr,
-		regnum);
-
-	/* Just clause 22 for the moment */
-	if (regnum & MII_ADDR_C45)
-		return -EOPNOTSUPP;
-
 	rc = aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C22, MDIO_C22_OP_READ,
 			    addr, regnum, 0);
 	if (rc < 0)
@@ -98,17 +91,46 @@ static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
 	return aspeed_mdio_get_data(bus);
 }
 
+static int aspeed_mdio_write_c22(struct mii_bus *bus, int addr, int regnum,
+				 u16 val)
+{
+	return aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C22, MDIO_C22_OP_WRITE,
+			      addr, regnum, val);
+}
+
+static int aspeed_mdio_read_c45(struct mii_bus *bus, int addr, int regnum)
+{
+	/* TODO: add c45 support */
+	return -EOPNOTSUPP;
+}
+
+static int aspeed_mdio_write_c45(struct mii_bus *bus, int addr, int regnum,
+				 u16 val)
+{
+	/* TODO: add c45 support */
+	return -EOPNOTSUPP;
+}
+
+static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
+{
+	dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d\n", __func__, addr,
+		regnum);
+
+	if (regnum & MII_ADDR_C45)
+		return aspeed_mdio_read_c45(bus, addr, regnum);
+
+	return aspeed_mdio_read_c22(bus, addr, regnum);
+}
+
 static int aspeed_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
 {
 	dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d, val: 0x%x\n",
 		__func__, addr, regnum, val);
 
-	/* Just clause 22 for the moment */
 	if (regnum & MII_ADDR_C45)
-		return -EOPNOTSUPP;
+		return aspeed_mdio_write_c45(bus, addr, regnum, val);
 
-	return aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C22, MDIO_C22_OP_WRITE,
-			      addr, regnum, val);
+	return aspeed_mdio_write_c22(bus, addr, regnum, val);
 }
 
 static int aspeed_mdio_probe(struct platform_device *pdev)
-- 
2.17.1