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Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0201-BCM270X_DT-Reduce-default-at86rf233-SPI-frequency.patch')
-rw-r--r--target/linux/brcm2708/patches-4.1/0201-BCM270X_DT-Reduce-default-at86rf233-SPI-frequency.patch36
1 files changed, 36 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0201-BCM270X_DT-Reduce-default-at86rf233-SPI-frequency.patch b/target/linux/brcm2708/patches-4.1/0201-BCM270X_DT-Reduce-default-at86rf233-SPI-frequency.patch
new file mode 100644
index 0000000000..af1c54e39e
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.1/0201-BCM270X_DT-Reduce-default-at86rf233-SPI-frequency.patch
@@ -0,0 +1,36 @@
+From a78ad9a34f11fecfdcd08675396bf2bf163a3f4d Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Mon, 12 Oct 2015 08:52:00 +0100
+Subject: [PATCH 201/203] BCM270X_DT: Reduce default at86rf233 SPI frequency
+
+The AT86RF233 has been found to be unreliable on a 7.5MHz SPI bus,
+so reduce the default frequency to 6MHz.
+
+See: https://github.com/raspberrypi/linux/issues/1151
+---
+ arch/arm/boot/dts/overlays/README | 2 +-
+ arch/arm/boot/dts/overlays/at86rf233-overlay.dts | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -178,7 +178,7 @@ Load: dtoverlay=at86rf233,<param>=<val
+ Params: interrupt GPIO used for INT (default 23)
+ reset GPIO used for Reset (default 24)
+ sleep GPIO used for Sleep (default 25)
+- speed SPI bus speed in Hz (default 750000)
++ speed SPI bus speed in Hz (default 6000000)
+ trim Fine tuning of the internal capacitance
+ arrays (0=+0pF, 15=+4.5pF, default 15)
+
+--- a/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
++++ b/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
+@@ -25,7 +25,7 @@
+ interrupts = <23 4>; /* active high */
+ reset-gpio = <&gpio 24 1>;
+ sleep-gpio = <&gpio 25 1>;
+- spi-max-frequency = <7500000>;
++ spi-max-frequency = <6000000>;
+ xtal-trim = /bits/ 8 <0xf>;
+ };
+ };