[PATCH net-next 2/2] net: mdio-mux: Add MDIO mux driver for Sophgo CV1800 SoCs
Andrew Lunn
andrew at lunn.ch
Wed Jun 11 09:13:00 PDT 2025
On Wed, Jun 11, 2025 at 04:02:00PM +0800, Inochi Amaoto wrote:
> Add device driver for the mux driver for Sophgo CV18XX/SG200X
> series SoCs.
>
> @@ -0,0 +1,119 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Sophgo CV1800 MDIO multiplexer driver
> + *
> + * Copyright (C) 2025 Inochi Amaoto <inochiama at gmail.com>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/delay.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/mdio-mux.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#define EPHY_PAGE_SELECT 0x07c
> +#define EPHY_CTRL 0x800
> +#define EPHY_REG_SELECT 0x804
> +
> +#define EPHY_PAGE_SELECT_SRC GENMASK(12, 8)
> +
> +#define EPHY_CTRL_ANALOG_SHUTDOWN BIT(0)
> +#define EPHY_CTRL_USE_EXTPHY BIT(7)
> +#define EPHY_CTRL_PHYMODE BIT(8)
> +#define EPHY_CTRL_PHYMODE_SMI_RMII 1
> +#define EPHY_CTRL_EXTPHY_ID GENMASK(15, 11)
There are a lot of defines here which are not used, but as far as i
see, there is one 8bit register, where bit 7 controls the mux.
It looks like you can throw this driver away and just use
mdio-mux-mmioreg.c. This is from the binding documentation with a few
tweaks:
mdio-mux at 3009000 {
compatible = "mdio-mux-mmioreg", "mdio-mux";
mdio-parent-bus = <&xmdio0>;
#address-cells = <1>;
#size-cells = <0>;
reg = <0x3009000 1>;
mux-mask = <128>;
mdio at 0 {
reg = <0>;
#address-cells = <1>;
#size-cells = <0>;
phy_xgmii_slot1: ethernet-phy at 4 {
compatible = "ethernet-phy-ieee802.3-c45";
reg = <4>;
};
};
mdio at 128 {
reg = <128>;
#address-cells = <1>;
#size-cells = <0>;
ethernet-phy at 4 {
compatible = "ethernet-phy-ieee802.3-c45";
reg = <4>;
};
};
};
Andrew
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