Merge branch 'add-support-for-vsc85xx-dt-rgmii-delays'

Harini Katakam says:

====================
Add support for VSC85xx DT RGMII delays

Provide an option to change RGMII delay value via devicetree.
====================

Link: https://lore.kernel.org/r/20230529122017.10620-1-harini.katakam@amd.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/mscc/mscc.h

@@ -292,6 +292,7 @@ enum rgmii_clock_delay {
 #define PHY_ID_VSC8575			  0x000707d0
 #define PHY_ID_VSC8582			  0x000707b0
 #define PHY_ID_VSC8584			  0x000707c0
+#define PHY_VENDOR_MSCC			0x00070400
 
 #define MSCC_VDDMAC_1500		  1500
 #define MSCC_VDDMAC_1800		  1800

drivers/net/phy/mscc/mscc_main.c

@@ -107,6 +107,9 @@ static const struct vsc8531_edge_rate_table edge_table[] = {
 };
 #endif
 
+static const int vsc85xx_internal_delay[] = {200, 800, 1100, 1700, 2000, 2300,
+					     2600, 3400};
+
 static int vsc85xx_phy_read_page(struct phy_device *phydev)
 {
 	return __phy_read(phydev, MSCC_EXT_PAGE_ACCESS);
@@ -525,8 +528,12 @@ static int vsc85xx_update_rgmii_cntl(struct phy_device *phydev, u32 rgmii_cntl,
 {
 	u16 rgmii_rx_delay_pos = ffs(rgmii_rx_delay_mask) - 1;
 	u16 rgmii_tx_delay_pos = ffs(rgmii_tx_delay_mask) - 1;
+	int delay_size = ARRAY_SIZE(vsc85xx_internal_delay);
+	struct device *dev = &phydev->mdio.dev;
 	u16 reg_val = 0;
 	u16 mask = 0;
+	s32 rx_delay;
+	s32 tx_delay;
 	int rc = 0;
 
 	/* For traffic to pass, the VSC8502 family needs the RX_CLK disable bit
@@ -541,12 +548,28 @@ static int vsc85xx_update_rgmii_cntl(struct phy_device *phydev, u32 rgmii_cntl,
 	if (phy_interface_is_rgmii(phydev))
 		mask |= rgmii_rx_delay_mask | rgmii_tx_delay_mask;
 
+	rx_delay = phy_get_internal_delay(phydev, dev, vsc85xx_internal_delay,
+					  delay_size, true);
+	if (rx_delay < 0) {
 		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
 		    phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
-		reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_rx_delay_pos;
+			rx_delay = RGMII_CLK_DELAY_2_0_NS;
+		else
+			rx_delay = RGMII_CLK_DELAY_0_2_NS;
+	}
+
+	tx_delay = phy_get_internal_delay(phydev, dev, vsc85xx_internal_delay,
+					  delay_size, false);
+	if (tx_delay < 0) {
 		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
 		    phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
-		reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_tx_delay_pos;
+			rx_delay = RGMII_CLK_DELAY_2_0_NS;
+		else
+			rx_delay = RGMII_CLK_DELAY_0_2_NS;
+	}
+
+	reg_val |= rx_delay << rgmii_rx_delay_pos;
+	reg_val |= tx_delay << rgmii_tx_delay_pos;
 
 	if (mask)
 		rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2,
@@ -2678,21 +2701,7 @@ static struct phy_driver vsc85xx_driver[] = {
 module_phy_driver(vsc85xx_driver);
 
 static struct mdio_device_id __maybe_unused vsc85xx_tbl[] = {
-	{ PHY_ID_VSC8501, 0xfffffff0, },
-	{ PHY_ID_VSC8502, 0xfffffff0, },
-	{ PHY_ID_VSC8504, 0xfffffff0, },
-	{ PHY_ID_VSC8514, 0xfffffff0, },
-	{ PHY_ID_VSC8530, 0xfffffff0, },
-	{ PHY_ID_VSC8531, 0xfffffff0, },
-	{ PHY_ID_VSC8540, 0xfffffff0, },
-	{ PHY_ID_VSC8541, 0xfffffff0, },
-	{ PHY_ID_VSC8552, 0xfffffff0, },
-	{ PHY_ID_VSC856X, 0xfffffff0, },
-	{ PHY_ID_VSC8572, 0xfffffff0, },
-	{ PHY_ID_VSC8574, 0xfffffff0, },
-	{ PHY_ID_VSC8575, 0xfffffff0, },
-	{ PHY_ID_VSC8582, 0xfffffff0, },
-	{ PHY_ID_VSC8584, 0xfffffff0, },
+	{ PHY_ID_MATCH_VENDOR(PHY_VENDOR_MSCC) },
 	{ }
 };