From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Date: Wed, 1 Feb 2023 13:14:54 +0000 (+0900)
Subject: net: renesas: rswitch: Add "max-speed" handling
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=04c77d9130b693e56a477364af1e1be4379b1b49;p=linux.git

net: renesas: rswitch: Add "max-speed" handling

The previous code set the speed by the interface mode of PHY.
Also this hardware has a restriction which cannot change the speed
at runtime. To use other speed, add "max-speed" handling to set
each port's speed if needed.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index f1a0dd1098f96..50b61a0a7f535 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -1072,13 +1072,23 @@ out:
 
 static int rswitch_etha_get_params(struct rswitch_device *rdev)
 {
+	u32 max_speed;
 	int err;
 
 	if (!rdev->np_port)
 		return 0;	/* ignored */
 
 	err = of_get_phy_mode(rdev->np_port, &rdev->etha->phy_interface);
+	if (err)
+		return err;
+
+	err = of_property_read_u32(rdev->np_port, "max-speed", &max_speed);
+	if (!err) {
+		rdev->etha->speed = max_speed;
+		return 0;
+	}
 
+	/* if no "max-speed" property, let's use default speed */
 	switch (rdev->etha->phy_interface) {
 	case PHY_INTERFACE_MODE_MII:
 		rdev->etha->speed = SPEED_100;
@@ -1090,11 +1100,10 @@ static int rswitch_etha_get_params(struct rswitch_device *rdev)
 		rdev->etha->speed = SPEED_2500;
 		break;
 	default:
-		err = -EINVAL;
-		break;
+		return -EINVAL;
 	}
 
-	return err;
+	return 0;
 }
 
 static int rswitch_mii_register(struct rswitch_device *rdev)