riscv: dts: canaan: Fix SPI3 bus width

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@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Fixes: 8f5b0e79f3e5 ("riscv: Add SiPeed MAIXDUINO board device tree")
Fixes: 8194f08bda18 ("riscv: Add SiPeed MAIX GO board device tree")
Fixes: a40f920964c4 ("riscv: Add SiPeed MAIX DOCK board device tree")
Fixes: 97c279bcf813 ("riscv: Add SiPeed MAIX BiT board device tree")
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts b/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts
index 984872f3d3a9b9ea0c8d2b1fd1ce927d1c7ac0bf..b9e30df127fefedf8cf9203733fa09d83babbebb 100644 (file)
--- a/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts
+++ b/arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts
@@ -203,6 +203,8 @@
                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 7ba99b4da304218e8a954df13c94190da4250bec..8d23401b0bbb6bcadbc293f45fc9247cbac5586b 100644 (file)
--- a/arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts
+++ b/arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts
@@ -205,6 +205,8 @@
                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 be9b12c9b374acb38aff0838b824ec9d84496ff6..24fd83b43d9d546e7f673333b61892f68d78457b 100644 (file)
--- a/arch/riscv/boot/dts/canaan/sipeed_maix_go.dts
+++ b/arch/riscv/boot/dts/canaan/sipeed_maix_go.dts
@@ -213,6 +213,8 @@
                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 031c0c28f81957772d1b38c2811951c11a191145..25341f38292aabf66a2a0b2b1ec70dffc5e004f8 100644 (file)
--- a/arch/riscv/boot/dts/canaan/sipeed_maixduino.dts
+++ b/arch/riscv/boot/dts/canaan/sipeed_maixduino.dts
@@ -178,6 +178,8 @@
                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;
        };