On 1/14/21 11:36 AM, Russell King wrote:
> The PHY address bit 2 is configured by the LED pin. Attaching a LED
> to this pin is not sufficient to guarantee this configuration pin is
> correctly read. This leads to some platforms having their PHY at
> address 0 and others at address 4.
>
> If there is no phy-handle specified, the FEC driver will scan the PHY
> bus for a PHY and use that. Consequently, adding the DT configuration
> of the PHY and the phy properties to the FEC driver broke some boards.
>
> Fix this by removing the phy-handle property, and listing two PHY
> entries for both possible PHY addresses, so that the DT configuration
> for the PHY can be found by the PHY driver.
>
> Fixes: 86b08bd5b994 ("ARM: dts: imx6-sr-som: add ethernet PHY configuration")
> Reported-by: Christoph Mattheis <christoph.mattheis@xxxxxxxx>
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
> ---
> arch/arm/boot/dts/imx6qdl-sr-som.dtsi | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
> index b06577808ff4..bba21dfef103 100644
> --- a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
> @@ -53,7 +53,6 @@
> &fec {
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_microsom_enet_ar8035>;
> - phy-handle = <&phy>;
> phy-mode = "rgmii-id";
> phy-reset-duration = <2>;
> phy-reset-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
> @@ -63,7 +62,15 @@
> #address-cells = <1>;
> #size-cells = <0>;
>
> - phy: ethernet-phy@0 {
> + /*
> + * The PHY can appear at either address 0 or 4 due to the
> + * configuration (LED) pin not being pulled sufficiently.
> + */
> + ethernet-phy@0 {
> + reg = <0>;
> + qca,clk-out-frequency = <125000000>;
> + };
> + ethernet-phy@4 {
> reg = <0>;
^
4?
regards,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
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