| Message ID | 1461151980-28139-3-git-send-email-vigneshr@ti.com |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On Wed, Apr 20, 2016 at 05:03:00PM +0530, Vignesh R wrote: > 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> > --- > > v2: rebased on linux-next 20160419 to include moving to > dra72-evm-common.dtsi > > > Documentation/devicetree/bindings/spi/ti_qspi.txt | 7 +++++++ > arch/arm/boot/dts/dra7-evm.dts | 6 ++---- > arch/arm/boot/dts/dra72-evm-common.dtsi | 6 ++---- > 3 files changed, 11 insertions(+), 8 deletions(-) Acked-by: Rob Herring <robh@kernel.org> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
* Rob Herring <robh@kernel.org> [160422 12:35]: > On Wed, Apr 20, 2016 at 05:03:00PM +0530, Vignesh R wrote: > > 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> > > --- > > > > v2: rebased on linux-next 20160419 to include moving to > > dra72-evm-common.dtsi > > > > > > Documentation/devicetree/bindings/spi/ti_qspi.txt | 7 +++++++ > > arch/arm/boot/dts/dra7-evm.dts | 6 ++---- > > arch/arm/boot/dts/dra72-evm-common.dtsi | 6 ++---- > > 3 files changed, 11 insertions(+), 8 deletions(-) > > Acked-by: Rob Herring <robh@kernel.org> Applying both into omap-for-v4.7/dt thanks. Tony -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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-common.dtsi b/arch/arm/boot/dts/dra72-evm-common.dtsi index beef82502ea0..e53b1ef8c7aa 100644 --- a/arch/arm/boot/dts/dra72-evm-common.dtsi +++ b/arch/arm/boot/dts/dra72-evm-common.dtsi @@ -681,15 +681,13 @@ &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>;
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> --- v2: rebased on linux-next 20160419 to include moving to dra72-evm-common.dtsi Documentation/devicetree/bindings/spi/ti_qspi.txt | 7 +++++++ arch/arm/boot/dts/dra7-evm.dts | 6 ++---- arch/arm/boot/dts/dra72-evm-common.dtsi | 6 ++---- 3 files changed, 11 insertions(+), 8 deletions(-)