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Commit b7a19228 authored by Vignesh R's avatar Vignesh R Committed by Tony Lindgren
Browse files

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: default avatarVignesh R <vigneshr@ti.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 62618078

Documentation/devicetree/bindings/spi/ti_qspi.txt

+7 −0
Original line number Original line Diff line number Diff line
@@ -19,6 +19,13 @@ Optional properties: 
- syscon-chipselects: Handle to system control region contains QSPI

- syscon-chipselects: Handle to system control region contains QSPI

		      chipselect register and offset of that register.

		      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:

Example:





For am4372:

For am4372:

arch/arm/boot/dts/dra7-evm.dts

+2 −4
Original line number Original line Diff line number Diff line
@@ -664,15 +664,13 @@ 
&qspi {

&qspi {

	status = "okay";

	status = "okay";





	spi-max-frequency = <48000000>;

	spi-max-frequency = <64000000>;

	m25p80@0 {

	m25p80@0 {

		compatible = "s25fl256s1";

		compatible = "s25fl256s1";

		spi-max-frequency = <48000000>;

		spi-max-frequency = <64000000>;

		reg = <0>;

		reg = <0>;

		spi-tx-bus-width = <1>;

		spi-tx-bus-width = <1>;

		spi-rx-bus-width = <4>;

		spi-rx-bus-width = <4>;

		spi-cpol;

		spi-cpha;

		#address-cells = <1>;

		#address-cells = <1>;

		#size-cells = <1>;

		#size-cells = <1>;

arch/arm/boot/dts/dra72-evm-common.dtsi

+2 −4
Original line number Original line Diff line number Diff line
@@ -681,15 +681,13 @@ 
&qspi {

&qspi {

	status = "okay";

	status = "okay";





	spi-max-frequency = <48000000>;

	spi-max-frequency = <64000000>;

	m25p80@0 {

	m25p80@0 {

		compatible = "s25fl256s1";

		compatible = "s25fl256s1";

		spi-max-frequency = <48000000>;

		spi-max-frequency = <64000000>;

		reg = <0>;

		reg = <0>;

		spi-tx-bus-width = <1>;

		spi-tx-bus-width = <1>;

		spi-rx-bus-width = <4>;

		spi-rx-bus-width = <4>;

		spi-cpol;

		spi-cpha;

		#address-cells = <1>;

		#address-cells = <1>;

		#size-cells = <1>;

		#size-cells = <1>;