linux-kernel - [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash

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Message-Id: <20170117125742.9536-1-fparent@baylibre.com>
Date:   Tue, 17 Jan 2017 13:57:42 +0100
From:   Fabien Parent <fparent@...libre.com>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     khilman@...libre.com, nsekhar@...com, robh+dt@...nel.org,
        mark.rutland@....com, Fabien Parent <fparent@...libre.com>
Subject: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash

Read access to the SPI flash are broken on da850-evm, i.e. the data
read is not what is actually programmed on the flash.
According to the datasheet for the M25P64 part present on the da850-evm,
if the SPI frequency is higher than 20MHz then the READ command is not
usable anymore and only the FAST_READ command can be used to read data.

This commit specifies in the DTS that we should use FAST_READ command
instead of the READ command.

Signed-off-by: Fabien Parent <fparent@...libre.com>
---
 arch/arm/boot/dts/da850-evm.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
index 41de15fe15a2..78492a0bbbab 100644
--- a/arch/arm/boot/dts/da850-evm.dts
+++ b/arch/arm/boot/dts/da850-evm.dts
@@ -99,6 +99,7 @@
 				#size-cells = <1>;
 				compatible = "m25p64";
 				spi-max-frequency = <30000000>;
+				m25p,fast-read;
 				reg = <0>;
 				partition@0 {
 					label = "U-Boot-SPL";
-- 
2.11.0