linux-kernel - [PATCH] net: phy: DP83822: enable rgmii mode if phy_interface_is

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Message-Id: <20220519182423.1554379-1-tommaso.merciai@amarulasolutions.com>
Date:   Thu, 19 May 2022 20:24:23 +0200
From:   Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     tommaso.merciai@...rulasolutions.com,
        alberto.bianchi@...rulasolutions.com, michael@...rulasolutions.com,
        linuxfancy@...glegroups.com, linux-amarula@...rulasolutions.com,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

RGMII mode can be enable from dp83822 straps, and also writing bit 9
of register 0x17 - RMII and Status Register (RCSR).
When phy_interface_is_rgmii this mode must be enabled

References:
 - https://www.ti.com/lit/gpn/dp83822i p66

Signed-off-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
Suggested-by: Alberto Bianchi <alberto.bianchi@...rulasolutions.com>
Tested-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
---
 drivers/net/phy/dp83822.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
index ce17b2af3218..66fa61fb86db 100644
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -408,6 +408,10 @@ static int dp83822_config_init(struct phy_device *phydev)
 			if (err)
 				return err;
 		}
+
+		/* Enable RGMII Mode */
+		phy_set_bits_mmd(phydev, DP83822_DEVADDR,
+					MII_DP83822_RCSR, BIT(9));
 	}
 
 	if (dp83822->fx_enabled) {
-- 
2.25.1