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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0156-BCM270X_DT-at86rf233-overlay-drop-to-3MHz.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0156-BCM270X_DT-at86rf233-overlay-drop-to-3MHz.patch36
1 files changed, 36 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0156-BCM270X_DT-at86rf233-overlay-drop-to-3MHz.patch b/target/linux/brcm2708/patches-4.4/0156-BCM270X_DT-at86rf233-overlay-drop-to-3MHz.patch
new file mode 100644
index 0000000000..7df9187d67
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0156-BCM270X_DT-at86rf233-overlay-drop-to-3MHz.patch
@@ -0,0 +1,36 @@
+From 8941fe4985a1cc8f800be00224c6a2e741789d03 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Thu, 18 Feb 2016 15:28:14 +0000
+Subject: [PATCH 156/156] BCM270X_DT: at86rf233 overlay - drop to 3MHz
+
+The consensus is that 6MHz is too fast, but that 3MHz is OK.
+
+See: https://github.com/raspberrypi/linux/issues/1294
+ 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
+@@ -188,7 +188,7 @@ 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 6000000)
++ speed SPI bus speed in Hz (default 3000000)
+ 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 = <6000000>;
++ spi-max-frequency = <3000000>;
+ xtal-trim = /bits/ 8 <0xf>;
+ };
+ };