According to Data Manual(SPRS915P) of AM57x, TI QSPI controller on DRA74(rev 1.1+)/DRA72 EVM can support up to 64MHz in MODE-0, whereas MODE-3 is limited to 48MHz. Hence, switch to MODE-0 for better throughput.
Signed-off-by: Vignesh R <[email protected]> --- Documentation/devicetree/bindings/spi/ti_qspi.txt | 7 +++++++ arch/arm/boot/dts/dra7-evm.dts | 6 ++---- arch/arm/boot/dts/dra72-evm.dts | 6 ++---- 3 files changed, 11 insertions(+), 8 deletions(-) diff --git a/Documentation/devicetree/bindings/spi/ti_qspi.txt b/Documentation/devicetree/bindings/spi/ti_qspi.txt index cc8304aa64ac..50b14f6b53a3 100644 --- a/Documentation/devicetree/bindings/spi/ti_qspi.txt +++ b/Documentation/devicetree/bindings/spi/ti_qspi.txt @@ -19,6 +19,13 @@ Optional properties: - syscon-chipselects: Handle to system control region contains QSPI chipselect register and offset of that register. +NOTE: TI QSPI controller requires different pinmux and IODelay +paramaters for Mode-0 and Mode-3 operations, which needs to be set up by +the bootloader (U-Boot). Default configuration only supports Mode-0 +operation. Hence, "spi-cpol" and "spi-cpha" DT properties cannot be +specified in the slave nodes of TI QSPI controller without appropriate +modification to bootloader. + Example: For am4372: diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts index 47d0745a08ad..507a8ec0a268 100644 --- a/arch/arm/boot/dts/dra7-evm.dts +++ b/arch/arm/boot/dts/dra7-evm.dts @@ -664,15 +664,13 @@ &qspi { status = "okay"; - spi-max-frequency = <48000000>; + spi-max-frequency = <64000000>; m25p80@0 { compatible = "s25fl256s1"; - spi-max-frequency = <48000000>; + spi-max-frequency = <64000000>; reg = <0>; spi-tx-bus-width = <1>; spi-rx-bus-width = <4>; - spi-cpol; - spi-cpha; #address-cells = <1>; #size-cells = <1>; diff --git a/arch/arm/boot/dts/dra72-evm.dts b/arch/arm/boot/dts/dra72-evm.dts index 479b74e1641e..46e1b72866f5 100644 --- a/arch/arm/boot/dts/dra72-evm.dts +++ b/arch/arm/boot/dts/dra72-evm.dts @@ -704,15 +704,13 @@ &qspi { status = "okay"; - spi-max-frequency = <48000000>; + spi-max-frequency = <64000000>; m25p80@0 { compatible = "s25fl256s1"; - spi-max-frequency = <48000000>; + spi-max-frequency = <64000000>; reg = <0>; spi-tx-bus-width = <1>; spi-rx-bus-width = <4>; - spi-cpol; - spi-cpha; #address-cells = <1>; #size-cells = <1>; -- 2.8.1
