Patchwork [U-Boot,08/15] spi: Add parameter for maximum write size

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Submitter Simon Glass
Date Dec. 26, 2012, 10:28 p.m.
Message ID <1356560913-2205-9-git-send-email-sjg@chromium.org>
Download mbox | patch
Permalink /patch/208237/
State Superseded, archived
Delegated to: Simon Glass
Headers show

Comments

Simon Glass - Dec. 26, 2012, 10:28 p.m.
Some SPI controllers (e.g. Intel ICH) have a limit on the number of SPI
bytes that can be written at a time. Add this as a parameter so that
clients of the SPI interface can respect this value.

Signed-off-by: Simon Glass <sjg@chromium.org>
---
 include/spi.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Patch

diff --git a/include/spi.h b/include/spi.h
index ebc9652..3fe2e1e 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -49,10 +49,13 @@ 
  *
  *   bus:	ID of the bus that the slave is attached to.
  *   cs:	ID of the chip select connected to the slave.
+ *   max_write_size:	If non-zero, the maximum number of bytes which can
+ *		be written at once, excluding command bytes.
  */
 struct spi_slave {
 	unsigned int	bus;
 	unsigned int	cs;
+	unsigned int max_write_size;
 };
 
 /*-----------------------------------------------------------------------