2021-03-04 16:37:56

by Fabio Estevam

[permalink] [raw]
Subject: Re: [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2

Hi Philippe,

On Thu, Mar 4, 2021 at 6:31 AM Philippe Schenker
<[email protected]> wrote:
>
> The current setting reflects about 86 Ohms of source-impedance
> on the SDIO signals where the WiFi board is hooked up. PCB traces are
> routed with 50 Ohms impedance and there are no serial resistors on
> those traces.
>
> This commit changes the source-impedance to 52 Ohms to better match our
> hardware design.
>
> The impedances given in this commit message refer to 3.3V operation.
>
> Signed-off-by: Philippe Schenker <[email protected]>

Reviewed-by: Fabio Estevam <[email protected]>