target/linux/brcm2708/patches-4.4/0149-BCM270X_DT-at86rf233-overlay-drop-to-3MHz.patch

   1 From 02062281b451fd98412ed607e8d662c0a8d3c19d Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Thu, 18 Feb 2016 15:28:14 +0000
   4 Subject: [PATCH] BCM270X_DT: at86rf233 overlay - drop to 3MHz
   5
   6 The consensus is that 6MHz is too fast, but that 3MHz is OK.
   7
   8 See: https://github.com/raspberrypi/linux/issues/1294
   9      https://github.com/raspberrypi/linux/issues/1151
  10 ---
  11  arch/arm/boot/dts/overlays/README                | 2 +-
  12  arch/arm/boot/dts/overlays/at86rf233-overlay.dts | 2 +-
  13  2 files changed, 2 insertions(+), 2 deletions(-)
  14
  15 --- a/arch/arm/boot/dts/overlays/README
  16 +++ b/arch/arm/boot/dts/overlays/README
  17 @@ -188,7 +188,7 @@ Load:   dtoverlay=at86rf233,<param>=<val
  18  Params: interrupt               GPIO used for INT (default 23)
  19          reset                   GPIO used for Reset (default 24)
  20          sleep                   GPIO used for Sleep (default 25)
  21 -        speed                   SPI bus speed in Hz (default 6000000)
  22 +        speed                   SPI bus speed in Hz (default 3000000)
  23          trim                    Fine tuning of the internal capacitance
  24                                  arrays (0=+0pF, 15=+4.5pF, default 15)
  25
  26 --- a/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
  27 +++ b/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
  28 @@ -25,7 +25,7 @@
  29                                 interrupts = <23 4>; /* active high */
  30                                 reset-gpio = <&gpio 24 1>;
  31                                 sleep-gpio = <&gpio 25 1>;
  32 -                               spi-max-frequency = <6000000>;
  33 +                               spi-max-frequency = <3000000>;
  34                                 xtal-trim = /bits/ 8 <0xf>;
  35                         };
  36                 };