[RFC v1 2/3] spi: spi-mem: add callback function to spi-mem device

[Tomer Maimon <tmaimon77@gmail.com>]

Add callback function support to the spi-mem device
for passing an argument from the spi-mem layer
to the spi layer.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 include/linux/spi/spi-mem.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index 5f7d20bd2b09..b9841a9030be 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -13,6 +13,8 @@
 
 #include <linux/spi/spi.h>
 
+typedef size_t (*spi_mem_callback)(void *spi_mem_param);
+
 #define SPI_MEM_OP_CMD(__opcode, __buswidth)			\
 	{							\
 		.buswidth = __buswidth,				\
@@ -172,6 +174,9 @@ struct spi_mem_dirmap_desc {
  * @spi: the underlying SPI device
  * @drvpriv: spi_mem_driver private data
  * @name: name of the SPI memory device
+ * @callback: routine for passing an argument from the
+ *            spi-mem layer to the spi layer.
+ * @callback_param: general parameter to pass to the callback routine
  *
  * Extra information that describe the SPI memory device and may be needed by
  * the controller to properly handle this device should be placed here.
@@ -183,6 +188,8 @@ struct spi_mem {
 	struct spi_device *spi;
 	void *drvpriv;
 	const char *name;
+	spi_mem_callback callback;
+	void *callback_param;
 };
 
 /**
-- 
2.18.0