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realtek: rtl838x: Instantiate auxiliary MDIO bus

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Add a disabled node for the auxiliary MDIO bus, used to manage the
RTL8231 expanders. A simple-mfd parent node is added, at the same
(implied) address as the switch@1b000000 node, as the switch drivers
should anyway transistion to MFD subdivices at some point.

Additionally, two pinctrl-single node are added to allow the MDX pins to
be muxed correctly, in case the bootloader leaves these unconfigured.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
This commit is contained in:
Sander Vanheule 2024-12-27 15:56:44 +01:00
parent ae833c01b3
commit 92ae8cb16c
2 changed files with 57 additions and 1 deletions
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56
target/linux/realtek/dts/rtl838x.dtsi
View File

@ -232,6 +232,42 @@
};
};
switchcore@1b000000 {
compatible = "syscon", "simple-mfd";
reg = <0x1b000000 0x20000>;
mdio_aux: mdio-aux {
compatible = "realtek,rtl8380-aux-mdio";
#address-cells = <1>;
#size-cells = <0>;
status = "disabled";
pinctrl-names = "default";
pinctrl-0 = <&mdio_aux_mdx>, <&aux_mode_mdio>;
};
};
pinmux@1b000144 {
compatible = "pinctrl-single";
reg = <0x1b000144 0x4>;
pinctrl-single,bit-per-mux;
pinctrl-single,register-width = <32>;
pinctrl-single,function-mask = <0x1>;
#pinctrl-cells = <2>;
/* I2C mode */
aux_mode_i2c: i2c-pins {
pinctrl-single,bits = <0x0 0x0 0x1>;
};
/* MDIO mode */
aux_mode_mdio: mdx-pins {
pinctrl-single,bits = <0x0 0x1 0x1>;
};
};
pinmux: pinmux@1b001000 {
compatible = "pinctrl-single";
reg = <0x1b001000 0x4>;
@ -262,6 +298,26 @@
};
};
pinmux@1b00a0e0 {
compatible = "pinctrl-single";
reg = <0x1b00a0e0 0x4>;
pinctrl-single,bit-per-mux;
pinctrl-single,register-width = <32>;
pinctrl-single,function-mask = <0x1>;
#pinctrl-cells = <2>;
/* Use SoC GPIO 2/3 as GPIO */
mdio_aux_gpio: gpio-pins {
pinctrl-single,bits = <0x0 0x0 0x1>;
};
/* Use SoC GPIO 2/3 as MDC/MDIO */
mdio_aux_mdx: mdx-pins {
pinctrl-single,bits = <0x0 0x1 0x1>;
};
};
ethernet0: ethernet@1b00a300 {
compatible = "realtek,rtl838x-eth";
reg = <0x1b00a300 0x100>;

2
target/linux/realtek/rtl838x/config-6.6
View File

@ -130,7 +130,7 @@ CONFIG_MDIO_BUS=y
CONFIG_MDIO_DEVICE=y
CONFIG_MDIO_DEVRES=y
CONFIG_MDIO_I2C=y
# CONFIG_MDIO_REALTEK_OTTO_AUX is not set
CONFIG_MDIO_REALTEK_OTTO_AUX=y
CONFIG_MDIO_SMBUS=y
CONFIG_MFD_SYSCON=y
CONFIG_MIGRATION=y