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:
 <TY3PR01MB11346F03BEBD966394DEF1D2A8695A@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Sat, 24 Jan 2026 12:46:58 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Prabhakar <prabhakar.csengg@...il.com>, 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>
CC: "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 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

Cheers,
Biju

> initialization of UHS-I cards. Similarly, while investigating the
> SD0 initialization issue on RZ/{T2H, N2H} and RZ/V2H evk boards, it was found that a ramp delay of
> 21ms is required for SD0 power regulator to ensure proper initialization of UHS-I cards.
> 
> This patch series adds the required ramp delay for SD0 power regulator on RZ/{T2H, N2H} and RZ/V2H evk
> boards. Additionally, it clarifies the SD0 power jumper settings in the respective dts files for
> RZ/{T2H, N2H} evk boards.
> 
> Cheers,
> Prabhakar
> 
> Lad Prabhakar (4):
>   arm64: dts: renesas: rzt2h-n2h-evk: Add ramp delay for SD0 card
>     regulator
>   arm64: dts: renesas: r9a09g077m44-rzt2h-evk: Clarify SD0 power jumpers
>   arm64: dts: renesas: r9a09g087m44-rzn2h-evk: Clarify SD0 power jumper
>     setup
>   arm64: dts: renesas: rzv2-evk-cn15-sd: Add ramp delay for SD0
>     regulator
> 
>  arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts | 9 ++++++---
> arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts | 6 ++++--  arch/arm64/boot/dts/renesas/rzt2h-
> n2h-evk-common.dtsi  | 1 +
>  arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso      | 1 +
>  4 files changed, 12 insertions(+), 5 deletions(-)
> 
> --
> 2.52.0