2016-12-02 10:50:26 +00:00
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From 8c1a913881a9805fce189f382f929beeb8ea2a50 Mon Sep 17 00:00:00 2001
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2016-02-25 10:14:01 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 18 Feb 2016 15:28:14 +0000
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] BCM270X_DT: at86rf233 overlay - drop to 3MHz
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2016-02-25 10:14:01 +00:00
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The consensus is that 6MHz is too fast, but that 3MHz is OK.
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See: https://github.com/raspberrypi/linux/issues/1294
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https://github.com/raspberrypi/linux/issues/1151
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---
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arch/arm/boot/dts/overlays/README | 2 +-
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arch/arm/boot/dts/overlays/at86rf233-overlay.dts | 2 +-
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2 files changed, 2 insertions(+), 2 deletions(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -188,7 +188,7 @@ Load: dtoverlay=at86rf233,<param>=<val
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Params: interrupt GPIO used for INT (default 23)
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reset GPIO used for Reset (default 24)
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sleep GPIO used for Sleep (default 25)
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- speed SPI bus speed in Hz (default 6000000)
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+ speed SPI bus speed in Hz (default 3000000)
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trim Fine tuning of the internal capacitance
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arrays (0=+0pF, 15=+4.5pF, default 15)
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--- a/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
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@@ -25,7 +25,7 @@
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interrupts = <23 4>; /* active high */
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reset-gpio = <&gpio 24 1>;
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sleep-gpio = <&gpio 25 1>;
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- spi-max-frequency = <6000000>;
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+ spi-max-frequency = <3000000>;
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xtal-trim = /bits/ 8 <0xf>;
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};
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};
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