From 4ef7af50373778ee248a2493c9cf62a2299806a8 Mon Sep 17 00:00:00 2001
From: Anton Vorontsov <avorontsov@ru.mvista.com>
Date: Tue, 31 Jul 2007 00:38:43 -0700
Subject: [PATCH] SPI loopback mode definition

Loopback mode is supported by various controllers.  This mode can be
useful for testing, especially in conjunction with spidev driver.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/spi/spi.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 302b81d1d11..e180615ed25 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -77,6 +77,7 @@ struct spi_device {
 #define	SPI_CS_HIGH	0x04			/* chipselect active high? */
 #define	SPI_LSB_FIRST	0x08			/* per-word bits-on-wire */
 #define	SPI_3WIRE	0x10			/* SI/SO signals shared */
+#define	SPI_LOOP	0x20			/* loopback mode */
 	u8			bits_per_word;
 	int			irq;
 	void			*controller_state;
-- 
2.11.4.GIT