0001-spi-spi-gpio-Add-spidelay.patch

From 71ce28abeb30a849fde20ccb78aaf83df06c2f16 Mon Sep 17 00:00:00 2001
From: Christian Mauderer <oss@c-mauderer.de>
Date: Sat, 8 Jun 2019 17:30:00 +0200
Subject: [PATCH] spi: spi-gpio: Add spidelay.

There are only few devices that can't handle >1MBit/s on SPI but there
are some. This allows to handle them using spi-gpio driver.

Signed-off-by: Christian Mauderer <oss@c-mauderer.de>
---
 drivers/spi/spi-gpio.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 1c34c9314c8a..551a196c3bd4 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -14,6 +14,7 @@
  * GNU General Public License for more details.
  */
 #include <linux/kernel.h>
+#include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
@@ -125,13 +126,7 @@ static inline int getmiso(const struct spi_device *spi)
 
 #undef pdata
 
-/*
- * NOTE:  this clocks "as fast as we can".  It "should" be a function of the
- * requested device clock.  Software overhead means we usually have trouble
- * reaching even one Mbit/sec (except when we can inline bitops), so for now
- * we'll just assume we never need additional per-bit slowdowns.
- */
-#define spidelay(nsecs)	do {} while (0)
+#define spidelay(x) ndelay(x)
 
 #include "spi-bitbang-txrx.h"
 
-- 
2.21.0