Re: [PATCH v2 2/2] net: phy: motorcomm: Add pad drive strength cfg support

The motorcomm phy (YT8531) supports the ability to adjust the drive
strength of the rx_clk/rx_data, and the default strength may not be
suitable for all boards. So add configurable options to better match
the boards.(e.g. StarFive VisionFive 2)

Signed-off-by: Samin Guo <redacted>
---
 drivers/net/phy/motorcomm.c | 46 +++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c
index 2fa5a90e073b..191650bb1454 100644
--- a/drivers/net/phy/motorcomm.c
+++ b/drivers/net/phy/motorcomm.c

@@ -236,6 +236,7 @@
  */
 #define YTPHY_WCR_TYPE_PULSE			BIT(0)
 
+#define YTPHY_PAD_DRIVE_STRENGTH_REG		0xA010
 #define YTPHY_SYNCE_CFG_REG			0xA012
 #define YT8521_SCR_SYNCE_ENABLE			BIT(5)
 /* 1b0 output 25m clock

@@ -260,6 +261,14 @@
 #define YT8531_SCR_CLK_SRC_REF_25M		4
 #define YT8531_SCR_CLK_SRC_SSC_25M		5
 
+#define YT8531_RGMII_RXC_DS_DEFAULT		0x3
+#define YT8531_RGMII_RXC_DS_MAX			0x7
+#define YT8531_RGMII_RXC_DS			GENMASK(15, 13)
+#define YT8531_RGMII_RXD_DS_DEFAULT		0x3
+#define YT8531_RGMII_RXD_DS_MAX			0x7
+#define YT8531_RGMII_RXD_DS_LOW			GENMASK(5, 4) /* Bit 1/0 of rxd_ds */
+#define YT8531_RGMII_RXD_DS_HI			BIT(12) /* Bit 2 of rxd_ds */

+
 /* Extended Register  end */
 
 #define YTPHY_DTS_OUTPUT_CLK_DIS		0

@@ -1495,6 +1504,7 @@ static int yt8531_config_init(struct phy_device *phydev)
 {
 	struct device_node *node = phydev->mdio.dev.of_node;
 	int ret;
+	u32 ds, val;
 
 	ret = ytphy_rgmii_clk_delay_config_with_lock(phydev);
 	if (ret < 0)

@@ -1518,6 +1528,42 @@ static int yt8531_config_init(struct phy_device *phydev)
 			return ret;
 	}
 
+	ds = YT8531_RGMII_RXC_DS_DEFAULT;
+	if (!of_property_read_u32(node, "motorcomm,rx-clk-driver-strength", &val)) {
+		if (val > YT8531_RGMII_RXC_DS_MAX)
+			return -EINVAL;
+
+		ds = val;
+	}
+
+	ret = ytphy_modify_ext_with_lock(phydev,
+					 YTPHY_PAD_DRIVE_STRENGTH_REG,
+					 YT8531_RGMII_RXC_DS,
+					 FIELD_PREP(YT8531_RGMII_RXC_DS, ds));
+	if (ret < 0)
+		return ret;
+
+	ds = FIELD_PREP(YT8531_RGMII_RXD_DS_LOW, YT8531_RGMII_RXD_DS_DEFAULT);
+	if (!of_property_read_u32(node, "motorcomm,rx-data-driver-strength", &val)) {
+		if (val > YT8531_RGMII_RXD_DS_MAX)
+			return -EINVAL;
+
+		if (val > FIELD_MAX(YT8531_RGMII_RXD_DS_LOW)) {
+			ds = val & FIELD_MAX(YT8531_RGMII_RXD_DS_LOW);
+			ds = FIELD_PREP(YT8531_RGMII_RXD_DS_LOW, ds);
+			ds |= YT8531_RGMII_RXD_DS_HI;
+		} else {
+			ds = FIELD_PREP(YT8531_RGMII_RXD_DS_LOW, val);
+		}
+	}
+
+	ret = ytphy_modify_ext_with_lock(phydev,
+					 YTPHY_PAD_DRIVE_STRENGTH_REG,
+					 YT8531_RGMII_RXD_DS_LOW | YT8531_RGMII_RXD_DS_HI,
+					 ds);
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }