arm64: dts: renesas: rzt2h-n2h-evk: Add note about SD1 1.8V modes

1.8V operation of SD1 requires the jumper to be placed on the correct
pins of a connector on these Evaluation Kits. 1.8V is needed to achieve
the higher rated speeds like SDR104. Add a note about it to make sure no
one else spends too much time figuring this out.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20251022073141.1989762-1-cosmin-gabriel.tanislav.xa@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 b7706d0bc3aa150c31b56bd9dee131ef396f1c94..d1474f1bd5236f2d7d1cf9a03d01c155c6833bce 100644 (file)
--- a/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts
+++ b/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts
@@ -26,6 +26,9 @@
  * P17_4 = SD1_CD; SW2[3] = ON
  * P08_5 = SD1_PWEN; SW2[3] = ON
  * P08_6 = SD1_IOVS; SW2[3] = ON; SW5[3] = OFF; SW5[4] = ON
+ * To enable proper operation in 1.8V modes, CN77 must have pins 2 and 3
+ * connected by the jumper. This connects SD1 power-supply control IC output
+ * back to VCC1833_7.
  */
 #define SD1_MICRO_SD   1
 

diff --git a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts b/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
index 17c0c79fbd96bdb72ce02f6ae616528bdead8cf4..eaf73868783b86bde70e1fc259a2506c723575ec 100644 (file)
--- a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
+++ b/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
@@ -30,6 +30,9 @@
 /*
  * P17_4 = SD1_CD; DSW5[3] = ON; DSW19[1] = OFF; DSW19[2] = ON
  * P08_6 = SD1_IOVS; DSW5[3] = ON
+ * To enable proper operation in 1.8V modes, JP21 must have pins 2 and 3
+ * connected by the jumper. This connects SD1 power-supply control IC output
+ * back to VCC1833_7.
  */
 #define SD1_MICRO_SD   1