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 rgmii mode must be enabled, same for
contrary, this prevents malconfigurations of hw straps

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

Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Suggested-by: Alberto Bianchi <alberto.bianchi@amarulasolutions.com>
Tested-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
index ce17b2af3218f0c0a64a4c1535af279791407b4e..e6ad3a494d32cce28139f54c2e64f52a440ee66b 100644 (file)
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -94,7 +94,8 @@
 #define DP83822_WOL_INDICATION_SEL BIT(8)
 #define DP83822_WOL_CLR_INDICATION BIT(11)
 
-/* RSCR bits */
+/* RCSR bits */
+#define DP83822_RGMII_MODE_EN  BIT(9)
 #define DP83822_RX_CLK_SHIFT   BIT(12)
 #define DP83822_TX_CLK_SHIFT   BIT(11)
 
@@ -408,6 +409,12 @@ static int dp83822_config_init(struct phy_device *phydev)
                        if (err)
                                return err;
                }
+
+               phy_set_bits_mmd(phydev, DP83822_DEVADDR,
+                                       MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
+       } else {
+               phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
+                                       MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
        }
 
        if (dp83822->fx_enabled) {