On Tue, Aug 7, 2018 at 8:29 PM <[email protected]> wrote:
>
> So I cut the trace for reset pin on Lan8710 and jumpered a wire to a gpio
> pin. And I added the reset gpio/reset-delay-us as shown in this link:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/net/mdio.txt
>
> I added following commands in am335x.dtsi on line 1057
>
> reset-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
> reset-delay-us = <100>;
>
I had a similar problem. I believe that you need to specify the phy as
a child node to trigger the reset GPIO logic in the mdio driver.
Here's the relevant section of my device tree:
&davinci_mdio {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&davinci_mdio_default>;
pinctrl-1 = <&davinci_mdio_sleep>;
status = "okay";
reset-gpios = <&gpio3 21 GPIO_ACTIVE_LOW>;
reset-delay-us = <100>;
ethphy0: @cpsw_emac0 {};
};
I've only done some quick tests, but it appears to be working.
-Frank
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