linux-kernel - Re: [PATCH 7/7] arm64: dts: tegra210-p2597: Remove no-1-8-v from sdmmc1

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Date:   Wed, 25 Jul 2018 09:58:37 +0300
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Aapo Vienamo <avienamo@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] arm64: dts: tegra210-p2597: Remove no-1-8-v from
 sdmmc1

Looks like patch 6 will probably cause tegra-sdhci to start advertising 
faster modes (see " if (!IS_ERR(host->mmc->supply.vqmmc))" in 
sdhci-tegra.c). With that patch and this, will the SDHCI core start to 
try putting us into these higher modes? Clearly that won't work yet 
before the upcoming patches.

Mikko

On 20.07.2018 15:45, Aapo Vienamo wrote:
> Allow sdmmc1 to set the signaling voltage to 1.8 V in order to support
> faster signaling modes.
> 
> Signed-off-by: Aapo Vienamo <avienamo@...dia.com>
> ---
>   arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
> index 9d5a0e6..365726d 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
> @@ -1452,7 +1452,6 @@
>   	sdhci@...b0000 {
>   		status = "okay";
>   		bus-width = <4>;
> -		no-1-8-v;
>   
>   		cd-gpios = <&gpio TEGRA_GPIO(Z, 1) GPIO_ACTIVE_LOW>;
>   
>