[PATCH 1/3] spi: core: add max_msg_size to spi_master

[Heiner Kallweit <hkallweit1@gmail.com>]

Add a member to spi_master allowing to better handle
SPI chips with a message size HW limit.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 include/linux/spi/spi.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index cce80e6..23e259b 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -302,6 +302,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
  *	and it's up to the individual driver to perform any validation.
  * @min_speed_hz: Lowest supported transfer speed
  * @max_speed_hz: Highest supported transfer speed
+ * @max_msg_size: maximum message size
  * @flags: other constraints relevant to this driver
  * @bus_lock_spinlock: spinlock for SPI bus locking
  * @bus_lock_mutex: mutex for SPI bus locking
@@ -417,6 +418,9 @@ struct spi_master {
 	u32			min_speed_hz;
 	u32			max_speed_hz;
 
+	/* maximum message size */
+	size_t			max_msg_size;
+
 	/* other constraints relevant to this driver */
 	u16			flags;
 #define SPI_MASTER_HALF_DUPLEX	BIT(0)		/* can't do full duplex */
-- 
2.6.2