[PATCH 3/3] phy: mscc: Add support for VSC8531_02 with RGMII tuning

[Harini Katakam <harini.katakam@xilinx.com>]

Add support for VSC8531_02 (Rev 2) device.
Add support for optional RGMII RX and TX delay tuning via devicetree.
The hierarchy is:
- Retain the defaul 0.2ns delay when RGMII tuning is not set.
- Retain the default 2ns delay when RGMII tuning is set and DT delay
property is NOT specified.
- Use the DT delay value when RGMII tuning is set and a DT delay
property is specified.

Signed-off-by: Harini Katakam <harini.katakam@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 drivers/net/phy/mscc/mscc.h      |  3 +++
 drivers/net/phy/mscc/mscc_main.c | 41 ++++++++++++++++++++++++++++++--
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h
index a50235fdf7d9..5a26eba0ace0 100644
--- a/drivers/net/phy/mscc/mscc.h
+++ b/drivers/net/phy/mscc/mscc.h
@@ -281,6 +281,7 @@ enum rgmii_clock_delay {
 #define PHY_ID_VSC8514			  0x00070670
 #define PHY_ID_VSC8530			  0x00070560
 #define PHY_ID_VSC8531			  0x00070570
+#define PHY_ID_VSC8531_02		  0x00070572
 #define PHY_ID_VSC8540			  0x00070760
 #define PHY_ID_VSC8541			  0x00070770
 #define PHY_ID_VSC8552			  0x000704e0
@@ -373,6 +374,8 @@ struct vsc8531_private {
 	 * package.
 	 */
 	unsigned int base_addr;
+	u32 rx_delay;
+	u32 tx_delay;
 
 #if IS_ENABLED(CONFIG_MACSEC)
 	/* MACsec fields:
diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
index 6e32da28e138..2b501824c802 100644
--- a/drivers/net/phy/mscc/mscc_main.c
+++ b/drivers/net/phy/mscc/mscc_main.c
@@ -535,15 +535,16 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
 	u16 rgmii_tx_delay_pos = ffs(rgmii_tx_delay_mask) - 1;
 	u16 reg_val = 0;
 	int rc;
+	struct vsc8531_private *vsc8531 = phydev->priv;
 
 	mutex_lock(&phydev->lock);
 
 	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;
+		reg_val |= vsc8531->rx_delay << rgmii_rx_delay_pos;
 	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;
+		reg_val |= vsc8531->tx_delay << rgmii_tx_delay_pos;
 
 	rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2,
 			      rgmii_cntl,
@@ -1820,6 +1821,17 @@ static int vsc85xx_config_init(struct phy_device *phydev)
 {
 	int rc, i, phy_id;
 	struct vsc8531_private *vsc8531 = phydev->priv;
+	struct device_node *of_node = phydev->mdio.dev.of_node;
+
+	rc = of_property_read_u32(of_node, "vsc8531,rx-delay",
+				  &vsc8531->rx_delay);
+	if (rc < 0)
+		vsc8531->rx_delay = RGMII_CLK_DELAY_2_0_NS;
+
+	rc = of_property_read_u32(of_node, "vsc8531,tx-delay",
+				  &vsc8531->tx_delay);
+	if (rc < 0)
+		vsc8531->tx_delay = RGMII_CLK_DELAY_2_0_NS;
 
 	rc = vsc85xx_default_config(phydev);
 	if (rc)
@@ -2444,6 +2456,30 @@ static struct phy_driver vsc85xx_driver[] = {
 	.get_strings    = &vsc85xx_get_strings,
 	.get_stats      = &vsc85xx_get_stats,
 },
+{
+	.phy_id		= PHY_ID_VSC8531_02,
+	.name		= "Microsemi VSC8531-02",
+	.phy_id_mask	= 0xfffffff0,
+	/* PHY_GBIT_FEATURES */
+	.soft_reset	= &genphy_soft_reset,
+	.config_init	= &vsc85xx_config_init,
+	.config_aneg	= &vsc85xx_config_aneg,
+	.read_status	= &vsc85xx_read_status,
+	.handle_interrupt	= vsc85xx_handle_interrupt,
+	.config_intr	= &vsc85xx_config_intr,
+	.suspend	= &genphy_suspend,
+	.resume		= &genphy_resume,
+	.probe		= &vsc85xx_probe,
+	.set_wol	= &vsc85xx_wol_set,
+	.get_wol	= &vsc85xx_wol_get,
+	.get_tunable	= &vsc85xx_get_tunable,
+	.set_tunable	= &vsc85xx_set_tunable,
+	.read_page	= &vsc85xx_phy_read_page,
+	.write_page	= &vsc85xx_phy_write_page,
+	.get_sset_count = &vsc85xx_get_sset_count,
+	.get_strings	= &vsc85xx_get_strings,
+	.get_stats	= &vsc85xx_get_stats,
+},
 {
 	.phy_id		= PHY_ID_VSC8540,
 	.name		= "Microsemi FE VSC8540 SyncE",
@@ -2668,6 +2704,7 @@ static struct mdio_device_id __maybe_unused vsc85xx_tbl[] = {
 	{ PHY_ID_VSC8514, 0xfffffff0, },
 	{ PHY_ID_VSC8530, 0xfffffff0, },
 	{ PHY_ID_VSC8531, 0xfffffff0, },
+	{ PHY_ID_VSC8531_02, 0xfffffff0, },
 	{ PHY_ID_VSC8540, 0xfffffff0, },
 	{ PHY_ID_VSC8541, 0xfffffff0, },
 	{ PHY_ID_VSC8552, 0xfffffff0, },
-- 
2.17.1