linux-kernel - [PATCH 2/4] arm64: dts: renesas: r9a09g077m44-rzt2h-evk: Clarify SD0 power jumpers

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Message-ID: <20260123225957.1007089-3-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 23 Jan 2026 22:59:55 +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 2/4] arm64: dts: renesas: r9a09g077m44-rzt2h-evk: Clarify SD0 power jumpers

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

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 <prabhakar.mahadev-lad.rj@...renesas.com>
---
 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] = ON; SW2[2] = ON
  *
  * To enable SD card and disable eMMC on SDHI0 disable the below macro
- * and set the below switch setting:
- * SW2[1] = OFF; SW2[2] = ON
+ * and set the switch as follows. Also ensure that CN78 pins 3 and 4 are connected
+ * with a jumper to provide the SD0 power supply when using an SD card.
+ *
+ * SW2[1] = OFF; SW2[2] = ON.
  */
 #define SD0_EMMC	1
 #define SD0_SD		(!SD0_EMMC)
-- 
2.52.0