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

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Message-ID: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 23 Jan 2026 22:59:53 +0000
From: Prabhakar <prabhakar.csengg@...il.com>
To: 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
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
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 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