linux-kernel - Re: [PATCH v4 3/3] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC

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Message-ID: <ZoUbiEy0AJ_JVVd8@shikoro>
Date: Wed, 3 Jul 2024 11:36:08 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: Prabhakar <prabhakar.csengg@...il.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v4 3/3] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC


> If I understand correctly,
> VMMC(Always on 3.3V) for card detection -->PWEN pin
> Vqmmc(1.8v-3.3V) for UHS operation for voltage switch-->IOVS pin

If these assumptions are correct, then I am sorry to have missed it. I
thougaht PWEN is for vqmmc. If it is not, then we need two regulators,
one for vmmc and one for vqmmc. This is what the TMIO core expects and
already handles correctly on its own, or? Except for the reset handling
where we need to preserve some value in the SDHI core.


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