On 23/08/14 10:11, Russell King wrote:
> From: Rabeeh Khoury <rabeeh@xxxxxxxxxxxxx>
> To: Shawn Guo <shawn.guo@xxxxxxxxxxxxx>
>
> MDIO pad must be set open drain.
>
> Signed-off-by: Rabeeh Khoury <rabeeh@xxxxxxxxxxxxx>
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
> ---
> arch/arm/boot/dts/imx6qdl-microsom-ar8035.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/imx6qdl-microsom-ar8035.dtsi b/arch/arm/boot/dts/imx6qdl-microsom-ar8035.dtsi
> index d16066608e21..db9f45b2c573 100644
> --- a/arch/arm/boot/dts/imx6qdl-microsom-ar8035.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-microsom-ar8035.dtsi
> @@ -17,7 +17,7 @@
> enet {
> pinctrl_microsom_enet_ar8035: microsom-enet-ar8035 {
> fsl,pins = <
> - MX6QDL_PAD_ENET_MDIO__ENET_MDIO 0x1b0b0
> + MX6QDL_PAD_ENET_MDIO__ENET_MDIO 0x1b8b0
> MX6QDL_PAD_ENET_MDC__ENET_MDC 0x1b0b0
> /* AR8035 reset */
> MX6QDL_PAD_KEY_ROW4__GPIO4_IO15 0x130b0
>
Can you elaborate some more on the reasons for this?
I'd like to understand if it's something specific to the hardware on that
board, or if other i.MX6 boards using the ar8035 are doing it wrong as well.
The datasheet strongly suggests this is the correct thing to do as MDIO
should electrically be open drain. However that suggests many more instances
of this incorrect configuration exist which also need changed, and not just
for ar8035.
While I'm reluctant to attribute something like this to the fec/interrupt
problems some people are seeing, I'd also like to be able to rule it out.
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
