[media] v4l: omap4iss: Add support for OMAP4 camera interface - Core

This adds a very simplistic driver to utilize the CSI2A interface inside
the ISS subsystem in OMAP4, and dump the data to memory.
Check Documentation/video4linux/omap4_camera.txt for details.
This commit adds the driver core, registers definitions and
documentation.

Signed-off-by: Sergio Aguirre <sergio.a.aguirre@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/include/media/omap4iss.h b/include/media/omap4iss.h
new file mode 100644
index 000000000000..0d7620db5e32
--- /dev/null
+++ b/include/media/omap4iss.h
@@ -0,0 +1,65 @@
+#ifndef ARCH_ARM_PLAT_OMAP4_ISS_H
+#define ARCH_ARM_PLAT_OMAP4_ISS_H
+
+#include <linux/i2c.h>
+
+struct iss_device;
+
+enum iss_interface_type {
+        ISS_INTERFACE_CSI2A_PHY1,
+        ISS_INTERFACE_CSI2B_PHY2,
+};
+
+/**
+ * struct iss_csiphy_lane: CSI2 lane position and polarity
+ * @pos: position of the lane
+ * @pol: polarity of the lane
+ */
+struct iss_csiphy_lane {
+        u8 pos;
+        u8 pol;
+};
+
+#define ISS_CSIPHY1_NUM_DATA_LANES      4
+#define ISS_CSIPHY2_NUM_DATA_LANES      1
+
+/**
+ * struct iss_csiphy_lanes_cfg - CSI2 lane configuration
+ * @data: Configuration of one or two data lanes
+ * @clk: Clock lane configuration
+ */
+struct iss_csiphy_lanes_cfg {
+        struct iss_csiphy_lane data[ISS_CSIPHY1_NUM_DATA_LANES];
+        struct iss_csiphy_lane clk;
+};
+
+/**
+ * struct iss_csi2_platform_data - CSI2 interface platform data
+ * @crc: Enable the cyclic redundancy check
+ * @vpclk_div: Video port output clock control
+ */
+struct iss_csi2_platform_data {
+        unsigned crc:1;
+        unsigned vpclk_div:2;
+        struct iss_csiphy_lanes_cfg lanecfg;
+};
+
+struct iss_subdev_i2c_board_info {
+        struct i2c_board_info *board_info;
+        int i2c_adapter_id;
+};
+
+struct iss_v4l2_subdevs_group {
+        struct iss_subdev_i2c_board_info *subdevs;
+        enum iss_interface_type interface;
+        union {
+                struct iss_csi2_platform_data csi2;
+        } bus; /* gcc < 4.6.0 chokes on anonymous union initializers */
+};
+
+struct iss_platform_data {
+        struct iss_v4l2_subdevs_group *subdevs;
+        void (*set_constraints)(struct iss_device *iss, bool enable);
+};
+
+#endif