net: mdio: realtek-rtl9300: Add device specific info structure

Device properties of the RTL930x SOCs are hardcoded into the MDIO driver.
This must be relaxed to support additional devices like the RTL838x or
RTL839x. These do not have 4 SMI buses but 1 or 2 instead.

To support multiple devices establish an info structure that contains
individual variations of each series. As a first use case add the number
of buses into this structure and use it where needed.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://patch.msgid.link/20260521175918.1494797-3-markus.stockhausen@gmx.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/mdio/mdio-realtek-rtl9300.c b/drivers/net/mdio/mdio-realtek-rtl9300.c
index 98484c689126f03d0a25c6aae69c0f127f13b2ad..931c6684b2f39a80f24dd4d8f1144c55f6faa360 100644 (file)
--- a/drivers/net/mdio/mdio-realtek-rtl9300.c
+++ b/drivers/net/mdio/mdio-realtek-rtl9300.c
@@ -51,6 +51,7 @@
 #include <linux/property.h>
 #include <linux/regmap.h>
 
+#define RTL9300_NUM_BUSES              4
 #define SMI_GLB_CTRL                   0xca00
 #define   GLB_CTRL_INTF_SEL(intf)      BIT(16 + (intf))
 #define SMI_PORT0_15_POLLING_SEL       0xca08
@@ -77,7 +78,12 @@
 #define MAX_SMI_BUSSES  4
 #define MAX_SMI_ADDR   0x1f
 
+struct otto_emdio_info {
+       u8 num_buses;
+};
+
 struct otto_emdio_priv {
+       const struct otto_emdio_info *info;
        struct regmap *regmap;
        struct mutex lock; /* protect HW access */
        DECLARE_BITMAP(valid_ports, MAX_PORTS);
@@ -357,7 +363,7 @@ static int otto_emdio_9300_mdiobus_init(struct otto_emdio_priv *priv)
 
        /* Put the interfaces into C45 mode if required */
        glb_ctrl_mask = GENMASK(19, 16);
-       for (i = 0; i < MAX_SMI_BUSSES; i++)
+       for (i = 0; i < priv->info->num_buses; i++)
                if (priv->smi_bus_is_c45[i])
                        glb_ctrl_val |= GLB_CTRL_INTF_SEL(i);
 
@@ -476,7 +482,7 @@ static int otto_emdio_map_ports(struct device *dev)
                if (err)
                        return err;
 
-               if (bus >= MAX_SMI_BUSSES)
+               if (bus >= priv->info->num_buses)
                        return dev_err_probe(dev, -EINVAL, "illegal smi bus number %d\n", bus);
 
                err = of_property_read_u32(phy_dn, "reg", &addr);
@@ -505,6 +511,7 @@ static int otto_emdio_probe(struct platform_device *pdev)
        if (err)
                return err;
 
+       priv->info = device_get_match_data(dev);
        priv->regmap = syscon_node_to_regmap(dev->parent->of_node);
        if (IS_ERR(priv->regmap))
                return PTR_ERR(priv->regmap);
@@ -528,8 +535,12 @@ static int otto_emdio_probe(struct platform_device *pdev)
        return 0;
 }
 
+static const struct otto_emdio_info otto_emdio_9300_info = {
+       .num_buses = RTL9300_NUM_BUSES,
+};
+
 static const struct of_device_id otto_emdio_ids[] = {
-       { .compatible = "realtek,rtl9301-mdio" },
+       { .compatible = "realtek,rtl9301-mdio", .data = &otto_emdio_9300_info },
        {}
 };
 MODULE_DEVICE_TABLE(of, otto_emdio_ids);