* [PATCH] ARM: dts: dra7xx: Increase spi-max-frequency to 76.8MHz for QSPI
@ 2016-08-01 13:06 Vignesh R
2016-08-26 15:15 ` Tony Lindgren
0 siblings, 1 reply; 2+ messages in thread
From: Vignesh R @ 2016-08-01 13:06 UTC (permalink / raw)
To: Tony Lindgren
Cc: Rob Herring, Mark Rutland, linux-omap, devicetree,
linux-arm-kernel, linux-kernel, Vignesh R
According to AM572x DM SPRS953A, QSPI maximum bus speed can be 76.8MHz.
Therefore, increase the spi-max-frequency value of QSPI node to 76.8MHz
for DRA74 and DRA72 evm. This improves flash raw read speed by ~2MB/s.
Signed-off-by: Vignesh R <vigneshr@ti.com>
---
arch/arm/boot/dts/dra7-evm.dts | 4 ++--
arch/arm/boot/dts/dra72-evm-common.dtsi | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index bafcfac067ec..f9d1170033fd 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -664,10 +664,10 @@
&qspi {
status = "okay";
- spi-max-frequency = <64000000>;
+ spi-max-frequency = <76800000>;
m25p80@0 {
compatible = "s25fl256s1";
- spi-max-frequency = <64000000>;
+ spi-max-frequency = <76800000>;
reg = <0>;
spi-tx-bus-width = <1>;
spi-rx-bus-width = <4>;
diff --git a/arch/arm/boot/dts/dra72-evm-common.dtsi b/arch/arm/boot/dts/dra72-evm-common.dtsi
index 9d3cf50ca37e..c94d8d64710d 100644
--- a/arch/arm/boot/dts/dra72-evm-common.dtsi
+++ b/arch/arm/boot/dts/dra72-evm-common.dtsi
@@ -681,10 +681,10 @@
&qspi {
status = "okay";
- spi-max-frequency = <64000000>;
+ spi-max-frequency = <76800000>;
m25p80@0 {
compatible = "s25fl256s1";
- spi-max-frequency = <64000000>;
+ spi-max-frequency = <76800000>;
reg = <0>;
spi-tx-bus-width = <1>;
spi-rx-bus-width = <4>;
--
2.9.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ARM: dts: dra7xx: Increase spi-max-frequency to 76.8MHz for QSPI
2016-08-01 13:06 [PATCH] ARM: dts: dra7xx: Increase spi-max-frequency to 76.8MHz for QSPI Vignesh R
@ 2016-08-26 15:15 ` Tony Lindgren
0 siblings, 0 replies; 2+ messages in thread
From: Tony Lindgren @ 2016-08-26 15:15 UTC (permalink / raw)
To: Vignesh R
Cc: Rob Herring, Mark Rutland, linux-omap, devicetree,
linux-arm-kernel, linux-kernel
* Vignesh R <vigneshr@ti.com> [160801 06:07]:
> According to AM572x DM SPRS953A, QSPI maximum bus speed can be 76.8MHz.
> Therefore, increase the spi-max-frequency value of QSPI node to 76.8MHz
> for DRA74 and DRA72 evm. This improves flash raw read speed by ~2MB/s.
Applying into omap-for-v4.9/dt thanks.
Tony
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-08-01 13:06 [PATCH] ARM: dts: dra7xx: Increase spi-max-frequency to 76.8MHz for QSPI Vignesh R
2016-08-26 15:15 ` Tony Lindgren
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