linux-kernel - Re: [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2

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Message-ID: <20210308013009.GT543@dragon>
Date:   Mon, 8 Mar 2021 09:30:30 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Philippe Schenker <philippe.schenker@...adex.com>
Cc:     devicetree@...r.kernel.org, Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for
 usdhc2

On Thu, Mar 04, 2021 at 10:31:39AM +0100, Philippe Schenker 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 <philippe.schenker@...adex.com>

Applied, thanks.