diff options
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.patch | 36 |
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 0000000..af1c54e --- /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>; + }; + }; |