boards: arm: adafruit_feather_nrf52840: use dual mode for QSPI NOR
Right before #28631 was merged the writeoc/readoc settings were ignored,
so the flash was actually working in single line mode. In turns out that
quad mode can't be used with this flash without setting the QE bit in
the status register, so until this is supported fall back to dual mode.
Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
diff --git a/boards/arm/adafruit_feather_nrf52840/adafruit_feather_nrf52840.dts b/boards/arm/adafruit_feather_nrf52840/adafruit_feather_nrf52840.dts
index 6378b92..8acfa5d 100644
--- a/boards/arm/adafruit_feather_nrf52840/adafruit_feather_nrf52840.dts
+++ b/boards/arm/adafruit_feather_nrf52840/adafruit_feather_nrf52840.dts
@@ -95,10 +95,13 @@
io-pins = <17>, <22>, <23>, <21>;
csn-pins = <20>;
gd25q16: gd25q16@0 {
+ /* NOTE: Quad mode not supported as driver does not handle
+ * QE bit setting in SR2. Ref. GD25Q16C, Rev 3.0, p. 12.
+ */
compatible = "nordic,qspi-nor";
reg = <0>;
- writeoc = "pp4io";
- readoc = "read4io";
+ writeoc = "pp2o";
+ readoc = "read2io";
sck-frequency = <16000000>;
label = "GD25Q16";
jedec-id = [c8 40 15];
