Hi All,
We are using DP83822 in our product interfacing it to imx7 MAC using linux driver. We want PHY DP83822 to operate in RMII master mode.
I have set following values in REG 0X17 = 0x61 and 0x0462 = 0x4300. I read back the values from PHY and they are coming to be same as set.
However I dont get any clock on RX_D3 / GPIO_3 Control pin.
How can I be sure that DP83822 is in RMII master mode and what can be the possible reason I am not getting clock?
Thanks & Regards,
Asma
Hi Aniruddha,
Thanks for quick reply. I am using DP83822 phy driver, from this link
https://elixir.bootlin.com/linux/latest/source/drivers/net/phy/dp83822.c
is it the correct one?
I configured register 0x0462 IO MUX GPIO Control Register #1 (IOCTRL1) and RCSR(00x17) for RMII master mode with Reference Clock: 50-MHz
Values in IOCTRL1 = 0x4300 and RCSR = 0x0061
There has been update:
Now I am getting clock on GPIO3 - but it is 6.25 MHz, I am expecting 50 Mhz clock.
What more configuration, do I need to do?
Device tree and schematic for reference:
&fec2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_enet2>;
phy-mode = "rmii";
phy-handle = <ðphy1>;
status = "okay";
mdio {
#address-cells = <1>;
#size-cells = <0>;
ethphy1: ethernet-phy@0 {
compatible = "ethernet-phy-ieee802.3-c22";
reg = <1>;
};
};
};
For reference clock input, we are using 25Mhz crystal oscillator across XI and X0 pins. Below is our schematic.
Regards,
Asma
