linux-kernel - Re: [PATCH 6/6] arm64: dts: imx8mm-kontron: Add support for reading SD

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Date:   Mon, 13 Feb 2023 17:08:48 +0100
From:   Marek Vasut <marex@...x.de>
To:     Frieder Schrempf <frieder@...s.de>, devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     Frieder Schrempf <frieder.schrempf@...tron.de>,
        Fabio Estevam <festevam@...il.com>,
        Heiko Thiery <heiko.thiery@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        NXP Linux Team <linux-imx@....com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH 6/6] arm64: dts: imx8mm-kontron: Add support for reading
 SD_VSEL signal

On 2/13/23 16:58, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> This fixes the LDO5 regulator handling of the pca9450 driver by
> taking the status of the SD_VSEL into account to determine which
> configuration register is used for the voltage setting.
> 
> Even without this change there is no functional issue, as the code
> for switching the voltage in sdhci.c currently switches both, the
> VSELECT/SD_VSEL signal and the regulator voltage at the same time
> and doesn't run into an invalid corner case.
> 
> We should still make sure, that we always use the correct register
> when controlling the regulator. At least in U-Boot this fixes an
> actual bug where the wrong IO voltage is used.
> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>

I may have a kind-of obvious request, since we removed those SD_VSEL 
very recently from other boards, could you just revert all those patches 
and only fill in the SION bit in V2 on all those boards too ? That way, 
we fix the LDO5 regulator for everyone who used it before.