Re: [PATCH] arm64: dts: imx8mn-var-som: add missing pull-up for onboard PHY reset pinmux

[Fabio Estevam]

On Tue, Jul 4, 2023 at 10:48 AM Hugo Villeneuve <hugo@xxxxxxxxxxx> wrote:
>
> From: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
>
> For SOMs with an onboard PHY, the RESET_N pull-up resistor is
> currently deactivated in the pinmux configuration. When the pinmux
> code selects the GPIO function for this pin, with a default direction
> of input, this prevents the RESET_N pin from being taken to the proper
> 3.3V level (deasserted), and this results in the PHY being not
> detected since it is held in reset.
>
> Taken from RESET_N pin description in ADIN13000 datasheet:
>     This pin requires a 1K pull-up resistor to AVDD_3P3.
>
> Activate the pull-up resistor to fix the issue.
>
> Fixes: ade0176dd8a0 ("arm64: dts: imx8mn-var-som: Add Variscite VAR-SOM-MX8MN System on Module")
> Signed-off-by: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>

Reviewed-by: Fabio Estevam <festevam@xxxxxxxxx>