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Fri, 23 Jan 2026 15:00:22 -0800 (PST) From: Prabhakar X-Google-Original-From: Prabhakar To: Geert Uytterhoeven , Magnus Damm , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-renesas-soc@vger.kernel.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH 1/4] arm64: dts: renesas: rzt2h-n2h-evk: Add ramp delay for SD0 card regulator Date: Fri, 23 Jan 2026 22:59:54 +0000 Message-ID: <20260123225957.1007089-2-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lad Prabhakar Add a ramp delay of 60 uV/us to the vqmmc_sdhi0 voltage regulator to fix UHS-I SD card detection failures. Measurements on CN78 pin 4 showed the actual voltage ramp time to be 21.86ms when switching between 3.3V and 1.8V. A 25ms ramp delay has been configured to provide adequate margin. The calculation is based on the voltage delta of 1.5V (3.3V - 1.8V): 1500000 uV / 60 uV/us =3D 25000 us (25ms) Prior to this patch, UHS-I cards failed to initialize with: [ 32.723914] mmc0: error -110 whilst initialising SD card After this patch, UHS-I cards are properly detected on SD0: [ 28.379122] mmc0: new UHS-I speed SDR104 SDXC card at address aaaa [ 28.387239] mmcblk0: mmc0:aaaa SR64G 59.5 GiB Fixes: d065453e5ee09("arm64: dts: renesas: rzt2h-rzn2h-evk: Enable SD card = slot") Signed-off-by: Lad Prabhakar --- arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi b/arch/a= rm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi index 510399febf29..f87c2492f414 100644 --- a/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi +++ b/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi @@ -53,6 +53,7 @@ vqmmc_sdhi0: regulator-vqmmc-sdhi0 { regulator-max-microvolt =3D <3300000>; gpios-states =3D <0>; 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Fri, 23 Jan 2026 15:00:24 -0800 (PST) From: Prabhakar X-Google-Original-From: Prabhakar To: Geert Uytterhoeven , Magnus Damm , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-renesas-soc@vger.kernel.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH 2/4] arm64: dts: renesas: r9a09g077m44-rzt2h-evk: Clarify SD0 power jumpers Date: Fri, 23 Jan 2026 22:59:55 +0000 Message-ID: <20260123225957.1007089-3-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lad Prabhakar Clarify the board setup requirements for using SDHI0 on the RZ/T2H EVK by documenting the CN78 jumper positions needed to supply SD0 power for either the default eMMC configuration or the SD card slot configuration. Signed-off-by: Lad Prabhakar --- arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts b/arch/= arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts index e9639bbb2d70..49464e6d212b 100644 --- a/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts +++ b/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts @@ -14,12 +14,15 @@ /* * SD0 can be connected to either eMMC (IC49) or SD card slot CN31 * Lets by default enable the eMMC, note we need the below SW settings - * for eMMC. + * for eMMC. Also ensure that CN78 pins 5 and 6 are connected with a jumper + * to provide the SD0 power supply when using eMMC. * SW2[1] =3D ON; SW2[2] =3D ON * * To enable SD card and disable eMMC on SDHI0 disable the below macro - * and set the below switch setting: - * SW2[1] =3D OFF; SW2[2] =3D ON + * and set the switch as follows. 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Fri, 23 Jan 2026 15:00:25 -0800 (PST) From: Prabhakar X-Google-Original-From: Prabhakar To: Geert Uytterhoeven , Magnus Damm , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-renesas-soc@vger.kernel.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH 3/4] arm64: dts: renesas: r9a09g087m44-rzn2h-evk: Clarify SD0 power jumper setup Date: Fri, 23 Jan 2026 22:59:56 +0000 Message-ID: <20260123225957.1007089-4-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lad Prabhakar Document the required JP23 jumper positions for supplying SD0 when selecting between the onboard eMMC and the SD card slot. Signed-off-by: Lad Prabhakar --- arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts b/arch/= arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts index 19f0a2c06753..4c0fe5c7e8aa 100644 --- a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts +++ b/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts @@ -14,12 +14,14 @@ /* * SD0 can be connected to either eMMC (U33) or SD card slot CN21 * Lets by default enable the eMMC, note we need the below SW settings - * for eMMC. + * for eMMC. Also ensure that JP23 pins 5 and 6 are connected with a jumper + * to provide the SD0 power supply when using eMMC. * DSW5[1] =3D ON; DSW5[2] =3D ON * DSW17[5] =3D OFF; DSW17[6] =3D ON * * To enable SD card and disable eMMC on SDHI0 disable the below macro - * and set the below switch setting: + * and set the below switch settings. Also ensure that JP23 pins 3 and 4 a= re + * connected with a jumper to provide the SD0 power supply when using an S= D card. * DSW5[1] =3D OFF; DSW5[2] =3D ON * P22_6 =3D SD0_WP; DSW15[1] =3D OFF; DSW15[2] =3D ON * P22_5 =3D SD0_CD; DSW15[3] =3D OFF; DSW15[4] =3D ON --=20 2.52.0 From nobody Mon Feb 9 14:55:51 2026 Received: from mail-wm1-f47.google.com (mail-wm1-f47.google.com [209.85.128.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 118DD2ED858 for ; Fri, 23 Jan 2026 23:00:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769209230; cv=none; b=rNlJtsr4f1NnHgKiDIvGlhSNyCQufCL4YnFuAN+S7WRJaRL34QozuFet/sxuXQi7qX1eAeK5QsH1yBgKQ2VVdRF+D1dsvBbNcofUEgbOBuS/RbwBaoI5IB8XRT3OEIQY8ZAVG5i6Ieg06mM0WUFh7/qOb7iWVLRXzqx6c6yAoFY= ARC-Message-Signature: i=1; a=rsa-sha256; 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charset="utf-8" From: Lad Prabhakar Set an appropriate ramp delay for the SD0 I/O voltage regulator in the CN15 SD overlay to make UHS-I voltage switching reliable during card initialization. This issue was observed on the RZ/V2H EVK, while the same UHS-I cards worked on the RZ/V2N EVK without problems. Adding the ramp delay makes the behavior consistent and avoids SD init timeouts. Before this change SD0 could fail with: [ 2.646242] mmc0: error -110 whilst initialising SD card With the delay in place UHS-I cards enumerate correctly: [ 2.633493] mmc0: new UHS-I speed SDR104 SDXC card at address aaaa [ 2.641687] mmcblk0: mmc0:aaaa SR64G 59.5 GiB [ 2.651489] mmcblk0: p1 Fixes: 3d6c2bc7629c8("arm64: dts: renesas: Add CN15 eMMC and SD overlays fo= r RZ/V2H and RZ/V2N EVKs") Signed-off-by: Lad Prabhakar --- arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso b/arch/arm64= /boot/dts/renesas/rzv2-evk-cn15-sd.dtso index 0af1e0a6c7f4..fc53c1aae3b5 100644 --- a/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso +++ b/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso @@ -25,6 +25,7 @@ vqmmc_sdhi0: regulator-vqmmc-sdhi0 { regulator-max-microvolt =3D <3300000>; gpios-states =3D <0>; states =3D <3300000 0>, <1800000 1>; + regulator-ramp-delay =3D <60>; }; }; =20 --=20 2.52.0