net: phy: dp83867: Add SGMII mode type switching

This patch adds ability to switch beetween two PHY SGMII modes.
Some hardware, for example, FPGA IP designs may use 6-wire mode
which enables differential SGMII clock to MAC.

Signed-off-by: Vitaly Gaiduk <vitaly.gaiduk@cloudbear.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 1f1ecee..37fceaf 100644 (file)
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -37,6 +37,7 @@
 #define DP83867_STRAP_STS2     0x006f
 #define DP83867_RGMIIDCTL      0x0086
 #define DP83867_IO_MUX_CFG     0x0170
+#define DP83867_SGMIICTL       0x00D3
 #define DP83867_10M_SGMII_CFG   0x016F
 #define DP83867_10M_SGMII_RATE_ADAPT_MASK BIT(7)
 
@@ -61,6 +62,9 @@
 #define DP83867_RGMII_TX_CLK_DELAY_EN          BIT(1)
 #define DP83867_RGMII_RX_CLK_DELAY_EN          BIT(0)
 
+/* SGMIICTL bits */
+#define DP83867_SGMII_TYPE             BIT(14)
+
 /* STRAP_STS1 bits */
 #define DP83867_STRAP_STS1_RESERVED            BIT(11)
 
@@ -109,6 +113,7 @@ struct dp83867_private {
        bool rxctrl_strap_quirk;
        bool set_clk_output;
        u32 clk_output_sel;
+       bool sgmii_ref_clk_en;
 };
 
 static int dp83867_ack_interrupt(struct phy_device *phydev)
@@ -197,6 +202,9 @@ static int dp83867_of_init(struct phy_device *phydev)
        dp83867->rxctrl_strap_quirk = of_property_read_bool(of_node,
                                        "ti,dp83867-rxctrl-strap-quirk");
 
+       dp83867->sgmii_ref_clk_en = of_property_read_bool(of_node,
+                                       "ti,sgmii-ref-clock-output-enable");
+
        /* Existing behavior was to use default pin strapping delay in rgmii
         * mode, but rgmii should have meant no delay.  Warn existing users.
         */
@@ -389,6 +397,17 @@ static int dp83867_config_init(struct phy_device *phydev)
 
                if (ret)
                        return ret;
+
+               val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL);
+               /* SGMII type is set to 4-wire mode by default.
+                * If we place appropriate property in dts (see above)
+                * switch on 6-wire mode.
+                */
+               if (dp83867->sgmii_ref_clk_en)
+                       val |= DP83867_SGMII_TYPE;
+               else
+                       val &= ~DP83867_SGMII_TYPE;
+               phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL, val);
        }
 
        /* Enable Interrupt output INT_OE in CFG3 register */