[PATCH 2/5] spi: spi-mem: Add a packed command operation

[Miquel Raynal]

Instead of repeating the command opcode twice, some flash devices try to
pack command and address bits. In this case, the second opcode byte
being sent (LSB) is free to be used. The input data must be ANDed to
only provide the relevant bits.

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
---
 include/linux/spi/spi-mem.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index 5774e554c0f0..f54c708f4c50 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -28,6 +28,14 @@
 		.dtr = true,					\
 	}
 
+#define SPI_MEM_DTR_OP_PACKED_CMD(__opcode, __addr, __buswidth)	\
+	{							\
+		.nbytes = 2,					\
+		.opcode = __opcode << 8 | __addr,		\
+		.buswidth = __buswidth,				\
+		.dtr = true,					\
+	}
+
 #define SPI_MEM_OP_ADDR(__nbytes, __val, __buswidth)		\
 	{							\
 		.nbytes = __nbytes,				\

-- 
2.53.0