sh: add spi header and r2d platform data V3

This patch adds the header file asm/spi.h and board specific code for the
r2d board. The header file contains a structure that should be used to
point out a single spi bus. The board specific code for r2d is updated with
such a structure for the new spi_sh_sci driver. The structure contains a
chip select callback plus information about the R9701 rtc chip which is
attached to the spi bus.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 55 insertions, 0 deletions

diff --git a/arch/sh/boards/renesas/rts7751r2d/setup.c b/arch/sh/boards/renesas/rts7751r2d/setup.c
index 8528616feaa0..3452b072adde 100644
--- a/arch/sh/boards/renesas/rts7751r2d/setup.c
+++ b/arch/sh/boards/renesas/rts7751r2d/setup.c
@@ -16,9 +16,12 @@
 #include <linux/sm501-regs.h>
 #include <linux/pm.h>
 #include <linux/fb.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
 #include <asm/machvec.h>
 #include <asm/rts7751r2d.h>
 #include <asm/io.h>
+#include <asm/spi.h>
 
 static struct resource cf_ide_resources[] = {
         [0] = {
@@ -53,6 +56,43 @@ static struct platform_device cf_ide_device  = {
         },
 };
 
+static struct spi_board_info spi_bus[] = {
+        {
+                .modalias       = "rtc-r9701",
+                .max_speed_hz   = 1000000,
+                .mode           = SPI_MODE_3,
+        },
+};
+
+static void r2d_chip_select(struct sh_spi_info *spi, int cs, int state)
+{
+        BUG_ON(cs != 0);  /* Single Epson RTC-9701JE attached on CS0 */
+        ctrl_outw(state == BITBANG_CS_ACTIVE, PA_RTCCE);
+}
+
+static struct sh_spi_info spi_info = {
+        .num_chipselect = 1,
+        .chip_select = r2d_chip_select,
+};
+
+static struct resource spi_sh_sci_resources[] = {
+        {
+                .start  = 0xffe00000,
+                .end    = 0xffe0001f,
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device spi_sh_sci_device  = {
+        .name           = "spi_sh_sci",
+        .id             = -1,
+        .num_resources  = ARRAY_SIZE(spi_sh_sci_resources),
+        .resource       = spi_sh_sci_resources,
+        .dev    = {
+                .platform_data  = &spi_info,
+        },
+};
+
 static struct resource heartbeat_resources[] = {
         [0] = {
                 .start  = PA_OUTPORT,
@@ -176,10 +216,12 @@ static struct platform_device *rts7751r2d_devices[] __initdata = {
 #endif
         &cf_ide_device,
         &heartbeat_device,
+        &spi_sh_sci_device,
 };
 
 static int __init rts7751r2d_devices_setup(void)
 {
+        spi_register_board_info(spi_bus, ARRAY_SIZE(spi_bus));
         return platform_add_devices(rts7751r2d_devices,
                                     ARRAY_SIZE(rts7751r2d_devices));
 }
diff --git a/include/asm-sh/spi.h b/include/asm-sh/spi.h
new file mode 100644
index 000000000000..e96f5b0953c8
--- /dev/null
+++ b/include/asm-sh/spi.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_SPI_H__
+#define __ASM_SPI_H__
+
+struct sh_spi_info;
+
+struct sh_spi_info {
+        int                      bus_num;
+        int                      num_chipselect;
+
+        void (*chip_select)(struct sh_spi_info *spi, int cs, int state);
+};
+
+#endif /* __ASM_SPI_H__ */