linux-kernel - [PATCH 3/4] arm64: dts: renesas: r9a09g087m44-rzn2h-evk: Clarify SD0 power jumper setup

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Message-ID: <20260123225957.1007089-4-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 23 Jan 2026 22:59:56 +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 3/4] arm64: dts: renesas: r9a09g087m44-rzn2h-evk: Clarify SD0 power jumper setup

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

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 <prabhakar.mahadev-lad.rj@...renesas.com>
---
 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] = ON; DSW5[2] = ON
  * DSW17[5] = OFF; DSW17[6] = 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 are
+ * connected with a jumper to provide the SD0 power supply when using an SD card.
  * DSW5[1] = OFF; DSW5[2] = ON
  * P22_6 = SD0_WP; DSW15[1] = OFF; DSW15[2] = ON
  * P22_5 = SD0_CD; DSW15[3] = OFF; DSW15[4] = ON
-- 
2.52.0