spi: Add parameter for maximum write size

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>

spi: Add parameter for maximum write size
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>
Simon Glass
1 parent 1853030e21
Showing 1 changed file with 3 additions and 0 deletions Side-by-side Diff
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;
 };
  
 /*-----------------------------------------------------------------------
...	...	@@ -49,10 +49,13 @@
49	49	*
50	50	* bus: ID of the bus that the slave is attached to.
51	51	* cs: ID of the chip select connected to the slave.
	52	+ * max_write_size: If non-zero, the maximum number of bytes which can
	53	+ * be written at once, excluding command bytes.
52	54	*/
53	55	struct spi_slave {
54	56	unsigned int bus;
55	57	unsigned int cs;
	58	+ unsigned int max_write_size;
56	59	};
57	60
58	61	/*-----------------------------------------------------------------------