From b54d84e60944ab5dcfe565000fed6063c5f8ac31 Mon Sep 17 00:00:00 2001
From: Daniel Chesters <daniel.chesters@gmail.com>
Date: Wed, 1 Nov 2017 15:13:55 +0100
Subject: [PATCH] Fix for support the raspberrypi kernel change on
 spi-max-frequency (see raspberrypi/linux#2165 and
 piface/pifacecad/issues/24#issuecomment-340642247) since kernel 4.9.43

---
 pifacecommon/spi.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pifacecommon/spi.py b/pifacecommon/spi.py
index 2aa5cfb..776ea99 100644
--- a/pifacecommon/spi.py
+++ b/pifacecommon/spi.py
@@ -65,7 +65,8 @@ def spisend(self, bytes_to_send):
         transfer = spi_ioc_transfer(
             tx_buf=ctypes.addressof(wbuffer),
             rx_buf=ctypes.addressof(rbuffer),
-            len=ctypes.sizeof(wbuffer)
+            len=ctypes.sizeof(wbuffer),
+            speed_hz=ctypes.c_uint32(100000)
         )
 
         if self.spi_callback is not None: