netdev - [PATCH net-next v5 5/5] net: renesas: rswitch: Add "max-speed" handling

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Date:   Wed,  1 Feb 2023 22:14:54 +0900
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: [PATCH net-next v5 5/5] 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@...esas.com>
---
 drivers/net/ethernet/renesas/rswitch.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index f1a0dd1098f9..50b61a0a7f53 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -1072,13 +1072,23 @@ static struct device_node *rswitch_get_port_node(struct rswitch_device *rdev)
 
 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)
-- 
2.25.1