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- From 8c1a913881a9805fce189f382f929beeb8ea2a50 Mon Sep 17 00:00:00 2001
- From: Phil Elwell <phil@raspberrypi.org>
- Date: Thu, 18 Feb 2016 15:28:14 +0000
- Subject: [PATCH] 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>;
- };
- };
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