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net: mdio: realtek-rtl9300: Add ports to info structure

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The ethernet MDIO controller in the Realtek Otto series has a very special
command register style. Instead of working with bus/address it works on
ethernet port numbers. For this the controller is initialized via mapping
registers that tell which port is mapped to which bus/address. Every
request to the driver is then converted as follows

1. Kernel calls driver with bus/address
2. Driver converts bus/address to port and issues command
3. Hardware maps port back to bus/address

The number of ports is different for each device. Make this configurable
by adding a property to the info structure. Switch the existing usage of
MAX_PORTS to this new property where needed.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://patch.msgid.link/20260521175918.1494797-4-markus.stockhausen@gmx.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Markus Stockhausen
2026-05-21 19:59:12 +02:00
committed by Paolo Abeni
parent 315a02b39e
commit 215701873a
1 changed files with 6 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/net/mdio/mdio-realtek-rtl9300.c
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@@ -52,6 +52,7 @@
#include <linux/regmap.h>
#define RTL9300_NUM_BUSES 4
#define RTL9300_NUM_PORTS 28
#define SMI_GLB_CTRL 0xca00
#define GLB_CTRL_INTF_SEL(intf) BIT(16 + (intf))
#define SMI_PORT0_15_POLLING_SEL 0xca08
@@ -80,6 +81,7 @@
struct otto_emdio_info {
u8 num_buses;
u8 num_ports;
};
struct otto_emdio_priv {
@@ -106,7 +108,7 @@ static int otto_emdio_phy_to_port(struct mii_bus *bus, int phy_id)
priv = chan->priv;
for_each_set_bit(i, priv->valid_ports, MAX_PORTS)
for_each_set_bit(i, priv->valid_ports, priv->info->num_ports)
if (priv->smi_bus[i] == chan->mdio_bus &&
priv->smi_addr[i] == phy_id)
return i;
@@ -351,7 +353,7 @@ static int otto_emdio_9300_mdiobus_init(struct otto_emdio_priv *priv)
int i, err;
/* Associate the port with the SMI interface and PHY */
for_each_set_bit(i, priv->valid_ports, MAX_PORTS) {
for_each_set_bit(i, priv->valid_ports, priv->info->num_ports) {
int pos;
pos = (i % 6) * 5;
@@ -472,7 +474,7 @@ static int otto_emdio_map_ports(struct device *dev)
if (err)
return err;
if (pn >= MAX_PORTS)
if (pn >= priv->info->num_ports)
return dev_err_probe(dev, -EINVAL, "illegal port number %d\n", pn);
if (test_bit(pn, priv->valid_ports))
@@ -537,6 +539,7 @@ static int otto_emdio_probe(struct platform_device *pdev)
static const struct otto_emdio_info otto_emdio_9300_info = {
.num_buses = RTL9300_NUM_BUSES,
.num_ports = RTL9300_NUM_PORTS,
};
static const struct of_device_id otto_emdio_ids[] = {