linux-kernel - Re: [PATCH 0/4] arm64: dts: renesas: Fix SD0 failures on RZ/{T2H, N2H} and RZ/V2H

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Message-ID: <CA+V-a8uA+qeeCCFmpHG=9tsb4LnHPjKP6j5sAF6ZitQQAdYuJQ@mail.gmail.com>
Date: Mon, 26 Jan 2026 09:44:22 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>, "magnus.damm" <magnus.damm@...il.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>, 
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 0/4] arm64: dts: renesas: Fix SD0 failures on RZ/{T2H,
 N2H} and RZ/V2H

Hi Biju,

On Sat, Jan 24, 2026 at 12:47 PM Biju Das <biju.das.jz@...renesas.com> wrote:
>
> Hi Prabhakar,
>
> > -----Original Message-----
> > From: Prabhakar <prabhakar.csengg@...il.com>
> > Sent: 23 January 2026 23:00
> > Subject: [PATCH 0/4] arm64: dts: renesas: Fix SD0 failures on RZ/{T2H, N2H} and RZ/V2H
> >
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Hi all,
> >
> > During testing of SD card functionality on RZ/{T2H, N2H} and RZ/V2H evk boards, it was observed that
> > the SD card initialization was failing for UHS-I cards. While investigating the issue on RZ/G3L smarc
> > board it was found that 12ms ramp delay is required for SD0 power regulator to ensure proper
>
>
> It is 1.2 msec voltage ramp for switching from 3.3v to 1.8v on RZ/G3L SMARC
>
Right, thanks for correcting.

Cheers,
Prabhakar