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

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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>
This commit is contained in:
Markus Stockhausen 2026-05-21 19:59:11 +02:00 committed by Paolo Abeni
parent d15c0d1df4
commit 315a02b39e
1 changed files with 14 additions and 3 deletions
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17
drivers/net/mdio/mdio-realtek-rtl9300.c
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@ -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);