arm64: dts: renesas: r9a09g077m44-rzt2h-evk: Clarify SD0 power jumpers

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@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260123225957.1007089-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts b/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts
index e9639bbb2d703bd9404c5c4e2174ea634266647b..49464e6d212bcf8040e99f6b01698abceab035b4 100644 (file)
--- 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)