spi/spi-dw.h: Expose interface for platform code to register external CS

Some platforms use a chip select mechanism other than that provided by
the controller.  Expose the mechanism for the platform code to
register the external chip select control function with the driver.

Change-Id: If2807645a629833ebd50bab9073c56d70ea1826d
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>

diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c
index aeefae5..b37748f 100644 (file)
--- a/drivers/spi/dw_spi.c
+++ b/drivers/spi/dw_spi.c
@@ -23,6 +23,7 @@
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
 #include <linux/spi/spi.h>
+#include <linux/spi/spi-dw.h>
 
 #include "dw_spi.h"
 
@@ -34,9 +35,6 @@
 #define QUEUE_RUNNING  0
 #define QUEUE_STOPPED  1
 
-#define SPI_DW_DEASSERT        0
-#define SPI_DW_ASSERT  1
-
 /* Slave spi_dev related */
 struct chip_data {
        struct spi_device *spi_dev;

diff --git a/drivers/spi/dw_spi.h b/drivers/spi/dw_spi.h
index f7527a3..665e8c8 100644 (file)
--- a/drivers/spi/dw_spi.h
+++ b/drivers/spi/dw_spi.h
@@ -207,16 +207,6 @@ static inline void spi_dw_umask_intr(struct spi_dw *dws, u32 mask)
        dw_writel(dws, imr, new_mask);
 }
 
-/*
- * Each SPI slave device to work with dw_api controller should
- * has such a structure claiming its working mode (PIO/DMA etc),
- * which can be save in the "controller_data" member of the
- * struct spi_device
- */
-struct spi_dw_chip {
-       void (*cs_control)(u32 command);
-};
-
 extern int spi_dw_add_host(struct spi_dw *dws);
 extern void spi_dw_remove_host(struct spi_dw *dws);
 extern int spi_dw_suspend_host(struct spi_dw *dws);

diff --git a/include/linux/spi/spi-dw.h b/include/linux/spi/spi-dw.h
new file mode 100644 (file)
index 0000000..a8931a1
--- /dev/null
+++ b/include/linux/spi/spi-dw.h
@@ -0,0 +1,17 @@
+#ifndef _SPI_DW_H_
+#define _SPI_DW_H_
+
+#define SPI_DW_DEASSERT        0
+#define SPI_DW_ASSERT  1
+
+/*
+ * If the platform does not use on of the chip select lines provided
+ * by the SOC it may register a chip select control function. The
+ * address of initialized spi_dw_chip stucture in the controller_data
+ * member of spi_board_info structure registered with the subsystem.
+ */
+struct spi_dw_chip {
+       void (*cs_control)(u32 command);
+};
+
+#endif /* _SPI_DW_H_ */