From: Fabien Parent <fparent@baylibre.com>
To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: khilman@baylibre.com, nsekhar@ti.com, robh+dt@kernel.org,
mark.rutland@arm.com, Fabien Parent <fparent@baylibre.com>
Subject: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
Date: Tue, 17 Jan 2017 13:57:42 +0100 [thread overview]
Message-ID: <20170117125742.9536-1-fparent@baylibre.com> (raw)
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@baylibre.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
next reply other threads:[~2017-01-17 12:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-17 12:57 Fabien Parent [this message]
[not found] ` <20170117125742.9536-1-fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
2017-01-18 0:25 ` [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash Kevin Hilman
2017-01-18 9:58 ` Sekhar Nori
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