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-rw-r--r--include/uapi/linux/mmc/ioctl.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/uapi/linux/mmc/ioctl.h b/include/uapi/linux/mmc/ioctl.h
index 45f369dc0a42..00c08120f3ba 100644
--- a/include/uapi/linux/mmc/ioctl.h
+++ b/include/uapi/linux/mmc/ioctl.h
@@ -5,7 +5,10 @@
#include <linux/types.h>
struct mmc_ioc_cmd {
- /* Implies direction of data. true = write, false = read */
+ /*
+ * Direction of data: nonzero = write, zero = read.
+ * Bit 31 selects 'Reliable Write' for RPMB.
+ */
int write_flag;
/* Application-specific command. true = precede with CMD55 */