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boards: nrf52840dk_nrf52840: document suppported QSPI opcodes

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The SPI NOR device on this board supports fastread, 2READ, DREAD,
4READ, and QREAD for read opcodes, but only PP and QPP for write
opcodes.  Provide a clue to people trying to use 2READ with 2PP: it
won't work.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2020-10-20 10:20:50 -05:00 committed by Carles Cufí
parent 7d89cf2e0a
commit 61eee6d4fc
1 changed files with 2 additions and 0 deletions
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boards/arm/nrf52840dk_nrf52840/nrf52840dk_nrf52840.dts
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@ -210,7 +210,9 @@ arduino_i2c: &i2c0 {
mx25r64: mx25r6435f@0 {
compatible = "nordic,qspi-nor";
reg = <0>;
/* MX24R64 supports only pp and pp4io */
writeoc = "pp4io";
/* MX24R64 supports all readoc options */
readoc = "read4io";
sck-frequency = <8000000>;
label = "MX25R64";