[PATCH 3/3] phy: ti: gmii-sel: retrieve ports number and base offset from dt

[Grygorii Strashko <grygorii.strashko@ti.com>]

On K3 AM654x/J721E platforms the Port MII mode selection register(s) have
similar format and placed in the System Control Module (SCM) module
sequentially as one register per port, but, depending SOC and CPSW
instance, the base offset and number of ports can be different.

Hence, add possibility to retrieve number of ports and base registers
offset from DT and support for max possible number of ports supported by K3
SoCs like J721E.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 drivers/phy/ti/phy-gmii-sel.c | 44 ++++++++++++++++++++++++++---------
 1 file changed, 33 insertions(+), 11 deletions(-)

diff --git a/drivers/phy/ti/phy-gmii-sel.c b/drivers/phy/ti/phy-gmii-sel.c
index a6b7f22e85c4..5fd2e8a08bfc 100644
--- a/drivers/phy/ti/phy-gmii-sel.c
+++ b/drivers/phy/ti/phy-gmii-sel.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/of_net.h>
 #include <linux/phy.h>
 #include <linux/phy/phy.h>
@@ -41,6 +42,7 @@ struct phy_gmii_sel_soc_data {
 	u32 num_ports;
 	u32 features;
 	const struct reg_field (*regfields)[PHY_GMII_SEL_LAST];
+	bool use_of_data;
 };
 
 struct phy_gmii_sel_priv {
@@ -49,6 +51,8 @@ struct phy_gmii_sel_priv {
 	struct regmap *regmap;
 	struct phy_provider *phy_provider;
 	struct phy_gmii_sel_phy_priv *if_phys;
+	u32 num_ports;
+	u32 reg_offset;
 };
 
 static int phy_gmii_sel_mode(struct phy *phy, enum phy_mode mode, int submode)
@@ -168,14 +172,19 @@ struct phy_gmii_sel_soc_data phy_gmii_sel_soc_dm814 = {
 
 static const
 struct reg_field phy_gmii_sel_fields_am654[][PHY_GMII_SEL_LAST] = {
-	{
-		[PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x4040, 0, 1),
-	},
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x0, 0, 2), },
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x4, 0, 2), },
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x8, 0, 2), },
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0xC, 0, 2), },
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x10, 0, 2), },
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x14, 0, 2), },
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x18, 0, 2), },
+	{ [PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x1C, 0, 2), },
 };
 
 static const
 struct phy_gmii_sel_soc_data phy_gmii_sel_soc_am654 = {
-	.num_ports = 1,
+	.use_of_data = true,
 	.regfields = phy_gmii_sel_fields_am654,
 };
 
@@ -222,7 +231,7 @@ static struct phy *phy_gmii_sel_of_xlate(struct device *dev,
 	if (priv->soc_data->features & BIT(PHY_GMII_SEL_RMII_IO_CLK_EN) &&
 	    args->args_count < 2)
 		return ERR_PTR(-EINVAL);
-	if (phy_id > priv->soc_data->num_ports)
+	if (phy_id > priv->num_ports)
 		return ERR_PTR(-EINVAL);
 	if (phy_id != priv->if_phys[phy_id - 1].id)
 		return ERR_PTR(-EINVAL);
@@ -251,6 +260,7 @@ static int phy_gmii_init_phy(struct phy_gmii_sel_priv *priv, int port,
 
 	fields = soc_data->regfields[port - 1];
 	field = *fields++;
+	field.reg += priv->reg_offset;
 	dev_dbg(dev, "%s field %x %d %d\n", __func__,
 		field.reg, field.msb, field.lsb);
 
@@ -260,6 +270,7 @@ static int phy_gmii_init_phy(struct phy_gmii_sel_priv *priv, int port,
 	if_phy->fields[PHY_GMII_SEL_PORT_MODE] = regfield;
 
 	field = *fields++;
+	field.reg += priv->reg_offset;
 	if (soc_data->features & BIT(PHY_GMII_SEL_RGMII_ID_MODE)) {
 		regfield = devm_regmap_field_alloc(dev,
 						   priv->regmap,
@@ -272,6 +283,7 @@ static int phy_gmii_init_phy(struct phy_gmii_sel_priv *priv, int port,
 	}
 
 	field = *fields;
+	field.reg += priv->reg_offset;
 	if (soc_data->features & BIT(PHY_GMII_SEL_RMII_IO_CLK_EN)) {
 		regfield = devm_regmap_field_alloc(dev,
 						   priv->regmap,
@@ -299,19 +311,28 @@ static int phy_gmii_init_phy(struct phy_gmii_sel_priv *priv, int port,
 static int phy_gmii_sel_init_ports(struct phy_gmii_sel_priv *priv)
 {
 	const struct phy_gmii_sel_soc_data *soc_data = priv->soc_data;
-	struct device *dev = priv->dev;
 	struct phy_gmii_sel_phy_priv *if_phys;
-	int i, num_ports, ret;
+	struct device *dev = priv->dev;
+	int i, ret;
+
+	if (soc_data->use_of_data) {
+		const __be32 *offset;
+		u64 size;
 
-	num_ports = soc_data->num_ports;
+		offset = of_get_address(dev->of_node, 0, &size, NULL);
+		priv->num_ports = size / sizeof(u32);
+		if (!priv->num_ports)
+			return -EINVAL;
+		priv->reg_offset = __be32_to_cpu(*offset);
+	}
 
-	if_phys = devm_kcalloc(priv->dev, num_ports,
+	if_phys = devm_kcalloc(dev, priv->num_ports,
 			       sizeof(*if_phys), GFP_KERNEL);
 	if (!if_phys)
 		return -ENOMEM;
-	dev_dbg(dev, "%s %d\n", __func__, num_ports);
+	dev_dbg(dev, "%s %d\n", __func__, priv->num_ports);
 
-	for (i = 0; i < num_ports; i++) {
+	for (i = 0; i < priv->num_ports; i++) {
 		ret = phy_gmii_init_phy(priv, i + 1, &if_phys[i]);
 		if (ret)
 			return ret;
@@ -339,6 +360,7 @@ static int phy_gmii_sel_probe(struct platform_device *pdev)
 
 	priv->dev = &pdev->dev;
 	priv->soc_data = of_id->data;
+	priv->num_ports = priv->soc_data->num_ports;
 
 	priv->regmap = syscon_node_to_regmap(node->parent);
 	if (IS_ERR(priv->regmap)) {
-- 
2.17.1