xilinx_spi: add support for the DS570 IP.

This patch adds in support for the DS570 IP.

It's register compatible with the DS464, but adds support for 8/16/32 SPI.

The 8/16/32 support is added by attaching callbacks reading/writing the
proper amount of data. To indicate to the driver which amount of bits
to use a new field is introduced in the platform data struct.

Acked-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: John Linn <John.Linn@xilinx.com>
Signed-off-by: Richard Röjfors <richard.rojfors@mocean-labs.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/spi/xilinx_spi.h b/include/linux/spi/xilinx_spi.h
index a705ad85eebe..6f17278810b0 100644
--- a/include/linux/spi/xilinx_spi.h
+++ b/include/linux/spi/xilinx_spi.h
@@ -3,14 +3,16 @@
 
 /**
  * struct xspi_platform_data - Platform data of the Xilinx SPI driver
- * @num_chipselect:     Number of chip select by the IP
- * @little_endian       If registers should be accessed little endian or not
+ * @num_chipselect:     Number of chip select by the IP.
+ * @little_endian:      If registers should be accessed little endian or not.
+ * @bits_per_word:      Number of bits per word.
  * @devices:            Devices to add when the driver is probed.
  * @num_devices:        Number of devices in the devices array.
  */
 struct xspi_platform_data {
         u16 num_chipselect;
         bool little_endian;
+        u8 bits_per_word;
         struct spi_board_info *devices;
         u8 num_devices;
 };