From 6d67bc40a1f5236fb00c503ab631819939efc01d Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Mon, 12 Oct 2015 08:52:00 +0100 Subject: [PATCH 201/222] 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,=; /* 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>; }; };