linux-kernel - [PATCH] ARM: dts: dra7xx: Increase spi-max-frequency to 76.8MHz for QSPI

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Date:	Mon, 1 Aug 2016 18:36:55 +0530
From:	Vignesh R <vigneshr@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Vignesh R <vigneshr@...com>
Subject: [PATCH] ARM: dts: dra7xx: Increase spi-max-frequency to 76.8MHz for QSPI

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@...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