From: Niklas Cassel <niklas.cassel@xxxxxxx> According to the K210 Standalone SDK Programming guide: https://canaan-creative.com/wp-content/uploads/2020/03/kendryte_standalone_programming_guide_20190311144158_en.pdf Section 15.4.3.3: SPI0 and SPI1 supports: standard, dual, quad and octal transfers. SPI3 supports: standard, dual and quad transfers (octal is not supported). In order to support quad transfers (Quad SPI), SPI3 must have four IO wires connected to the SPI flash. Update the device tree to specify the correct bus width. Tested on maix bit, maix dock and maixduino, which all have the same SPI flash (gd25lq128d) connected to SPI3. maix go is untested, but it would not make sense for this k210 board to be designed differently. Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx> --- Changes since v1: -Add the new properties directly after spi-max-frequency for all DT board files. arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts | 2 ++ arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts | 2 ++ arch/riscv/boot/dts/canaan/sipeed_maix_go.dts | 2 ++ arch/riscv/boot/dts/canaan/sipeed_maixduino.dts | 2 ++ 4 files changed, 8 insertions(+) diff --git a/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts b/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts index 984872f3d3a9..b9e30df127fe 100644 --- a/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts +++ b/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts @@ -203,6 +203,8 @@ flash@0 { compatible = "jedec,spi-nor"; reg = <0>; spi-max-frequency = <50000000>; + spi-tx-bus-width = <4>; + spi-rx-bus-width = <4>; m25p,fast-read; broken-flash-reset; }; diff --git a/arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts b/arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts index 7ba99b4da304..8d23401b0bbb 100644 --- a/arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts +++ b/arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts @@ -205,6 +205,8 @@ flash@0 { compatible = "jedec,spi-nor"; reg = <0>; spi-max-frequency = <50000000>; + spi-tx-bus-width = <4>; + spi-rx-bus-width = <4>; m25p,fast-read; broken-flash-reset; }; diff --git a/arch/riscv/boot/dts/canaan/sipeed_maix_go.dts b/arch/riscv/boot/dts/canaan/sipeed_maix_go.dts index be9b12c9b374..24fd83b43d9d 100644 --- a/arch/riscv/boot/dts/canaan/sipeed_maix_go.dts +++ b/arch/riscv/boot/dts/canaan/sipeed_maix_go.dts @@ -213,6 +213,8 @@ flash@0 { compatible = "jedec,spi-nor"; reg = <0>; spi-max-frequency = <50000000>; + spi-tx-bus-width = <4>; + spi-rx-bus-width = <4>; m25p,fast-read; broken-flash-reset; }; diff --git a/arch/riscv/boot/dts/canaan/sipeed_maixduino.dts b/arch/riscv/boot/dts/canaan/sipeed_maixduino.dts index 031c0c28f819..25341f38292a 100644 --- a/arch/riscv/boot/dts/canaan/sipeed_maixduino.dts +++ b/arch/riscv/boot/dts/canaan/sipeed_maixduino.dts @@ -178,6 +178,8 @@ flash@0 { compatible = "jedec,spi-nor"; reg = <0>; spi-max-frequency = <50000000>; + spi-tx-bus-width = <4>; + spi-rx-bus-width = <4>; m25p,fast-read; broken-flash-reset; }; -- 2.35.1
