Hello,
we are building custom board with i.MX 8QuadXPlus and want to connect 2 KSZ8795 switches via MDIO, switch port5 is connected to ethernet controller via RGMII. There is likely something wrong with our device description, since KSZ8795 driver is not loaded and ethernet controller detects just generic PHY. Below is the switch configuration for one of the ethernet ports (FEC1) in device tree. Could you please take a look if the device tree snippet is correct or recommend some reference for MDIO switch in device tree? I tried following some examples I could find, but that's the best I come with:
&fec1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fec1>;
phy-mode = "rgmii";
phy-handle = <&switch0>;
fsl,magic-packet;
local-mac-address = [00 11 22 33 44 55];
status = "okay";
mdio {
#address-cells = <1>;
#size-cells = <0>;
switch0: switch-phy@0 {
compatible = "microchip,ksz8795";
reg = <0>;
/*reset-gpios = <&gpio7 6 GPIO_ACTIVE_LOW>; */
/*reset-duration = <100>; */
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
label = "lan1";
};
port@1 {
reg = <1>;
label = "lan2";
};
port@2 {
reg = <2>;
label = "lan3";
};
port@3 {
reg = <3>;
label = "lan4";
};
port@4 {
reg = <4>;
label = "cpu";
ethernet = <&fec1>;
fixed-link {
speed = <1000>;
full-duplex;
};
};
};
};
};
Thank you in advance!
解決済! 解決策の投稿を見る。
Hi sergey_tarassen
>want to connect 2 KSZ8795 switches via MDIO .. There is likely something
>wrong with our device description, since KSZ8795 driver is not loaded and
>ethernet controller detects just generic PHY.
had KSZ8795 info was added in spi node entries as described in micrel linux documentation:
per KSZ8795 datasheet sect.3.5.1.2 MII Management Interface (MIIM) :
"The MIIM interface does not have access to all the configuration registers in the
KSZ8795CLX. It can only access the standard MIIM register (see the MIIM Registers section).
The SPI interface, on the other hand, can be used to access all registers with the entire KSZ8795CLX feature set."
https://www.microchip.com/wwwproducts/en/KSZ8795
Best regards
igor
Hi sergey_tarassen
>want to connect 2 KSZ8795 switches via MDIO .. There is likely something
>wrong with our device description, since KSZ8795 driver is not loaded and
>ethernet controller detects just generic PHY.
had KSZ8795 info was added in spi node entries as described in micrel linux documentation:
per KSZ8795 datasheet sect.3.5.1.2 MII Management Interface (MIIM) :
"The MIIM interface does not have access to all the configuration registers in the
KSZ8795CLX. It can only access the standard MIIM register (see the MIIM Registers section).
The SPI interface, on the other hand, can be used to access all registers with the entire KSZ8795CLX feature set."
https://www.microchip.com/wwwproducts/en/KSZ8795
Best regards
igor
Igor, thank you for pointing out the register limitation, I suppose we'll need SPI connection.