phy: ti: gmii-sel: Add support for CPSW5G GMII SEL in J7200

Each of the CPSW5G ports in J7200 support additional modes like QSGMII.
Add a new compatible for J7200 to support the additional modes.

In TI's J7200, each of the CPSW5G ethernet interfaces can act as a
QSGMII or QSGMII-SUB port. The QSGMII interface is responsible for
performing auto-negotiation between the MAC and the PHY while the rest of
the interfaces are designated as QSGMII-SUB interfaces, indicating that
they will not be taking part in the auto-negotiation process.

To indicate the interface which will serve as the main QSGMII interface,
add a property "ti,qsgmii-main-ports", whose value indicates the
port number of the interface which shall serve as the main QSGMII
interface. The rest of the interfaces are then assigned QSGMII-SUB mode by
default. The property "ti,qsgmii-main-ports" is used to configure the
CTRLMMR_ENETx_CTRL register.

Depending on the device, it is possible for more than one QSGMII main port
to exist. Thus, the property "ti,qsgmii-main-ports" is defined as an array
of values in order to reuse the property for other devices.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://lore.kernel.org/r/20220912085650.83263-4-s-vadapalli@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/ti/phy-gmii-sel.c b/drivers/phy/ti/phy-gmii-sel.c
index d0ab69750c6b44ab36c5148af2216c6f235951ac..0bcfd6d96b4d0a67d0d0cc5a7dc579610844c8e4 100644 (file)
--- a/drivers/phy/ti/phy-gmii-sel.c
+++ b/drivers/phy/ti/phy-gmii-sel.c
@@ -22,6 +22,12 @@
 #define AM33XX_GMII_SEL_MODE_RMII      1
 #define AM33XX_GMII_SEL_MODE_RGMII     2
 
+/* J72xx SoC specific definitions for the CONTROL port */
+#define J72XX_GMII_SEL_MODE_QSGMII     4
+#define J72XX_GMII_SEL_MODE_QSGMII_SUB 6
+
+#define PHY_GMII_PORT(n)       BIT((n) - 1)
+
 enum {
        PHY_GMII_SEL_PORT_MODE = 0,
        PHY_GMII_SEL_RGMII_ID_MODE,
@@ -43,6 +49,7 @@ struct phy_gmii_sel_soc_data {
        u32 features;
        const struct reg_field (*regfields)[PHY_GMII_SEL_LAST];
        bool use_of_data;
+       u64 extra_modes;
 };
 
 struct phy_gmii_sel_priv {
@@ -53,6 +60,7 @@ struct phy_gmii_sel_priv {
        struct phy_gmii_sel_phy_priv *if_phys;
        u32 num_ports;
        u32 reg_offset;
+       u32 qsgmii_main_ports;
 };
 
 static int phy_gmii_sel_mode(struct phy *phy, enum phy_mode mode, int submode)
@@ -88,10 +96,17 @@ static int phy_gmii_sel_mode(struct phy *phy, enum phy_mode mode, int submode)
                gmii_sel_mode = AM33XX_GMII_SEL_MODE_MII;
                break;
 
+       case PHY_INTERFACE_MODE_QSGMII:
+               if (!(soc_data->extra_modes & BIT(PHY_INTERFACE_MODE_QSGMII)))
+                       goto unsupported;
+               if (if_phy->priv->qsgmii_main_ports & BIT(if_phy->id - 1))
+                       gmii_sel_mode = J72XX_GMII_SEL_MODE_QSGMII;
+               else
+                       gmii_sel_mode = J72XX_GMII_SEL_MODE_QSGMII_SUB;
+               break;
+
        default:
-               dev_warn(dev, "port%u: unsupported mode: \"%s\"\n",
-                        if_phy->id, phy_modes(submode));
-               return -EINVAL;
+               goto unsupported;
        }
 
        if_phy->phy_if_mode = submode;
@@ -123,6 +138,11 @@ static int phy_gmii_sel_mode(struct phy *phy, enum phy_mode mode, int submode)
        }
 
        return 0;
+
+unsupported:
+       dev_warn(dev, "port%u: unsupported mode: \"%s\"\n",
+                if_phy->id, phy_modes(submode));
+       return -EINVAL;
 }
 
 static const
@@ -188,6 +208,13 @@ struct phy_gmii_sel_soc_data phy_gmii_sel_soc_am654 = {
        .regfields = phy_gmii_sel_fields_am654,
 };
 
+static const
+struct phy_gmii_sel_soc_data phy_gmii_sel_cpsw5g_soc_j7200 = {
+       .use_of_data = true,
+       .regfields = phy_gmii_sel_fields_am654,
+       .extra_modes = BIT(PHY_INTERFACE_MODE_QSGMII),
+};
+
 static const struct of_device_id phy_gmii_sel_id_table[] = {
        {
                .compatible     = "ti,am3352-phy-gmii-sel",
@@ -209,6 +236,10 @@ static const struct of_device_id phy_gmii_sel_id_table[] = {
                .compatible     = "ti,am654-phy-gmii-sel",
                .data           = &phy_gmii_sel_soc_am654,
        },
+       {
+               .compatible     = "ti,j7200-cpsw5g-phy-gmii-sel",
+               .data           = &phy_gmii_sel_cpsw5g_soc_j7200,
+       },
        {}
 };
 MODULE_DEVICE_TABLE(of, phy_gmii_sel_id_table);
@@ -350,6 +381,7 @@ static int phy_gmii_sel_probe(struct platform_device *pdev)
        struct device_node *node = dev->of_node;
        const struct of_device_id *of_id;
        struct phy_gmii_sel_priv *priv;
+       u32 main_ports = 1;
        int ret;
 
        of_id = of_match_node(phy_gmii_sel_id_table, pdev->dev.of_node);
@@ -363,6 +395,15 @@ 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;
+       of_property_read_u32(node, "ti,qsgmii-main-ports", &main_ports);
+       /*
+        * Ensure that main_ports is within bounds. If the property
+        * ti,qsgmii-main-ports is not mentioned, or the value mentioned
+        * is out of bounds, default to 1.
+        */
+       if (main_ports < 1 || main_ports > 4)
+               main_ports = 1;
+       priv->qsgmii_main_ports = PHY_GMII_PORT(main_ports);
 
        priv->regmap = syscon_node_to_regmap(node->parent);
        if (IS_ERR(priv->regmap)) {