Merge branch 'topic/hda' into for-linus

[pandora-kernel.git] / include / linux / spi / spi.h

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 2cc43fa..a0faa18 100644 (file)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -245,7 +245,12 @@ struct spi_master {
         */
        u16                     dma_alignment;
 
-       /* setup mode and clock, etc (spi driver may call many times) */
+       /* Setup mode and clock, etc (spi driver may call many times).
+        *
+        * IMPORTANT:  this may be called when transfers to another
+        * device are active.  DO NOT UPDATE SHARED REGISTERS in ways
+        * which could break those transfers.
+        */
        int                     (*setup)(struct spi_device *spi);
 
        /* bidirectional bulk transfers