linux-kernel - Re: [PATCH] arm64: dts: mediatek: add mmc2 support for mt8365-evk

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Message-ID: <fda131d9-50bf-4049-9e6a-f9cea61846c9@baylibre.com>
Date: Wed, 15 Jan 2025 13:12:29 +0100
From: Alexandre Mergnat <amergnat@...libre.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 macpaul.Lin@...iatek.com
Cc: vsatoes@...libre.com, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH] arm64: dts: mediatek: add mmc2 support for mt8365-evk



On 14/01/2025 11:38, AngeloGioacchino Del Regno wrote:
>> +&mmc2 {
>> +    assigned-clock-parents = <&topckgen CLK_TOP_MSDCPLL>;
>> +    assigned-clocks = <&topckgen CLK_TOP_MSDC50_2_SEL>;
>> +    bus-width = <4>;
>> +    cap-sd-highspeed;
>> +    cap-sdio-irq;
>> +    hs400-ds-delay = <0x12012>;
>> +    keep-power-in-suspend;
> 
> Why keep-power-in-suspend?

This slot is mainly used for WiFi / BT / GPS chip, which need to keep powered on.
I guess this is to avoid to do full re-init, re-load firmware, lose context, wake-up from it...
TBH, I didn't work on it, all I know is MTK need it.

-- 
Regards,
Alexandre