[PATCH v3] net: phy: dp83867: Add SGMII mode type switching

[Vitaly Gaiduk <vitaly.gaiduk@cloudbear.ru>]

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>
---
Changes in v3:
- Fixed retaining DP83867_SGMII_TYPE bit

 drivers/net/phy/dp83867.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 1f1ecee..37fceaf 100644
--- 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 */
--
2.7.4