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| author | Vignesh R <vigneshr@ti.com> | 2016-04-20 17:03:00 +0530 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2016-04-26 10:52:19 -0700 |
| commit | b7a1922814c617884a3fee9b107ffb784fa4cf94 (patch) | |
| tree | d5fb949550369dcef0c791d4c3e89a4bb2cd20dc /Documentation/devicetree/bindings/spi | |
| parent | 626180785f5d9443c475d2b2760f64bb510f2b66 (diff) | |
| download | linux-b7a1922814c617884a3fee9b107ffb784fa4cf94.tar.gz linux-b7a1922814c617884a3fee9b107ffb784fa4cf94.tar.bz2 linux-b7a1922814c617884a3fee9b107ffb784fa4cf94.zip | |
ARM: dts: dra7x: Support QSPI MODE-0 operation at 64MHz
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 <vigneshr@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'Documentation/devicetree/bindings/spi')
| -rw-r--r-- | Documentation/devicetree/bindings/spi/ti_qspi.txt | 7 |
1 files changed, 7 insertions, 0 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: |