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boards: arm: adafruit_feather_nrf52840: use dual mode for QSPI NOR

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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>
This commit is contained in:
Gerard Marull-Paretas 2020-10-01 11:56:03 +02:00 • committed by Carles Cufí
commit e390105b0f
1 changed files with 5 additions and 2 deletions
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7
boards/arm/adafruit_feather_nrf52840/adafruit_feather_nrf52840.dts
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@ -95,10 +95,13 @@
io-pins = <17>, <22>, <23>, <21>; io-pins = <17>, <22>, <23>, <21>;
csn-pins = <20>; csn-pins = <20>;
gd25q16: gd25q16@0 { 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"; compatible = "nordic,qspi-nor";
reg = <0>; reg = <0>;
writeoc = "pp4io"; writeoc = "pp2o";
readoc = "read4io"; readoc = "read2io";
sck-frequency = <16000000>; sck-frequency = <16000000>;
label = "GD25Q16"; label = "GD25Q16";
jedec-id = [c8 40 15]; jedec-id = [c8 40 15];