xilinx_spi: Switch to iomem functions and support little endian.

This patch changes the out_(be)(8|16|32) and in_(be)(8|16|32) calls to 32 bits ioread/iowrite.

The read and write function are attached to the internal struct as callbacks, callback
is selected depending on endianess.

This will also build on platforms not supporting the in/out calls for instance x86.

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, 2 insertions, 0 deletions

diff --git a/include/linux/spi/xilinx_spi.h b/include/linux/spi/xilinx_spi.h
index 06df0aba3aee..a705ad85eebe 100644
--- a/include/linux/spi/xilinx_spi.h
+++ b/include/linux/spi/xilinx_spi.h
@@ -4,11 +4,13 @@
 /**
  * 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
  * @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;
         struct spi_board_info *devices;
         u8 num_devices;
 };