linux-kernel - [PATCH net-next 1/2] net: phy: dp83867: introduce critical chip default init for non-of platform

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Message-Id: <20211013034128.2094426-2-boon.leong.ong@intel.com>
Date:   Wed, 13 Oct 2021 11:41:27 +0800
From:   Ong Boon Leong <boon.leong.ong@...el.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/2] net: phy: dp83867: introduce critical chip default init for non-of platform

From: "Lay, Kuan Loon" <kuan.loon.lay@...el.com>

PHY driver dp83867 has rich supports for OF-platform to fine-tune the PHY
chip during phy configuration. However, for non-OF platform, certain PHY
tunable parameters such as IO impedence and RX & TX internal delays are
critical and should be initialized to its default during PHY driver probe.

Signed-off-by: Lay, Kuan Loon <kuan.loon.lay@...el.com>
Co-developed-by: Ong Boon Leong <boon.leong.ong@...el.com>
Tested-by: Clement <clement@...el.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
---
 drivers/net/phy/dp83867.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 6bbc81ad295f..bb4369b75179 100644
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -619,6 +619,24 @@ static int dp83867_of_init(struct phy_device *phydev)
 #else
 static int dp83867_of_init(struct phy_device *phydev)
 {
+	struct dp83867_private *dp83867 = phydev->priv;
+	u16 delay;
+
+	/* For non-OF device, the RX and TX ID values are either strapped
+	 * or take from default value. So, we init RX & TX ID values here
+	 * so that the RGMIIDCTL is configured correctly later in
+	 * dp83867_config_init();
+	 */
+	delay = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIIDCTL);
+	dp83867->rx_id_delay = delay & DP83867_RGMII_RX_CLK_DELAY_MAX;
+	dp83867->tx_id_delay = (delay >> DP83867_RGMII_TX_CLK_DELAY_SHIFT) &
+			       DP83867_RGMII_TX_CLK_DELAY_MAX;
+
+	/* Per datasheet, IO impedance is default to 50-ohm, so we set the same
+	 * here or else the default '0' means highest IO impedence which is wrong.
+	 */
+	dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN / 2;
+
 	return 0;
 }
 #endif /* CONFIG_OF_MDIO */
-- 
2.25.1