--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <video_osd.h>
+
+int video_osd_get_info(struct udevice *dev, struct video_osd_info *info)
+{
+ struct video_osd_ops *ops = video_osd_get_ops(dev);
+
+ return ops->get_info(dev, info);
+}
+
+int video_osd_set_mem(struct udevice *dev, uint col, uint row, u8 *buf,
+ size_t buflen, uint count)
+{
+ struct video_osd_ops *ops = video_osd_get_ops(dev);
+
+ return ops->set_mem(dev, col, row, buf, buflen, count);
+}
+
+int video_osd_set_size(struct udevice *dev, uint col, uint row)
+{
+ struct video_osd_ops *ops = video_osd_get_ops(dev);
+
+ return ops->set_size(dev, col, row);
+}
+
+int video_osd_print(struct udevice *dev, uint col, uint row, ulong color,
+ char *text)
+{
+ struct video_osd_ops *ops = video_osd_get_ops(dev);
+
+ return ops->print(dev, col, row, color, text);
+}
+
+UCLASS_DRIVER(video_osd) = {
+ .id = UCLASS_VIDEO_OSD,
+ .name = "video_osd",
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
+};
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#ifndef _VIDEO_OSD_H_
+#define _VIDEO_OSD_H_
+
+struct video_osd_info {
+ /* The width of the OSD display in columns */
+ uint width;
+ /* The height of the OSD display in rows */
+ uint height;
+ /* The major version of the OSD device */
+ uint major_version;
+ /* The minor version of the OSD device */
+ uint minor_version;
+};
+
+/**
+ * struct video_osd_ops - driver operations for OSD uclass
+ *
+ * The OSD uclass implements support for text-oriented on-screen displays,
+ * which are taken to be devices that independently display a graphical
+ * text-based overlay over the video output of an associated display.
+ *
+ * The functions defined by the uclass support writing text to the display in
+ * either a generic form (by specifying a string, a driver-specific color value
+ * for the text, and screen coordinates in rows and columns) or a
+ * driver-specific form (by specifying "raw" driver-specific data to display at
+ * a given coordinate).
+ *
+ * Functions to read device information and set the size of the virtual OSD
+ * screen (in rows and columns) are also supported.
+ *
+ * Drivers should support these operations unless otherwise noted. These
+ * operations are intended to be used by uclass code, not directly from
+ * other code.
+ */
+struct video_osd_ops {
+ /**
+ * get_info() - Get information about a OSD instance
+ *
+ * A OSD instance may keep some internal data about itself. This
+ * function can be used to access this data.
+ *
+ * @dev: OSD instance to query.
+ * @info: Pointer to a structure that takes the information read
+ * from the OSD instance.
+ * @return 0 if OK, -ve on error.
+ */
+ int (*get_info)(struct udevice *dev, struct video_osd_info *info);
+
+ /**
+ * set_mem() - Write driver-specific text data to OSD screen
+ *
+ * The passed data are device-specific, and it's up to the driver how
+ * to interpret them. How the count parameter is interpreted is also
+ * driver-specific; most likely the given data will be written to the
+ * OSD count times back-to-back, which is e.g. convenient for filling
+ * areas of the OSD with a single character.
+ *
+ * For example a invocation of
+ *
+ * video_osd_set_mem(dev, 0, 0, "A", 1, 10);
+ *
+ * will write the device-specific text data "A" to the positions (0, 0)
+ * to (9, 0) on the OSD.
+ *
+ * Device-specific text data may, e.g. be a special encoding of glyphs
+ * to display and color values in binary format.
+ *
+ * @dev: OSD instance to write to.
+ * @col: Horizontal character coordinate to write to.
+ * @row Vertical character coordinate to write to.
+ * @buf: Array containing device-specific data to write to the
+ * specified coordinate on the OSD screen.
+ * @buflen: Length of the data in the passed buffer (in byte).
+ * @count: Write count many repetitions of the given text data
+ * @return 0 if OK, -ve on error.
+ */
+ int (*set_mem)(struct udevice *dev, uint col, uint row, u8 *buf,
+ size_t buflen, uint count);
+
+ /**
+ * set_size() - Set the position and dimension of the OSD's
+ * writeable window
+ *
+ * @dev: OSD instance to write to.
+ * @col The number of characters in the window's columns
+ * @row The number of characters in the window's rows
+ * @return 0 if OK, -ve on error.
+ */
+ int (*set_size)(struct udevice *dev, uint col, uint row);
+
+ /**
+ * print() - Print a string in a given color to specified coordinates
+ * on the OSD
+ *
+ * @dev: OSD instance to write to.
+ * @col The x-coordinate of the position the string should be
+ * written to
+ * @row The y-coordinate of the position the string should be
+ * written to
+ * @color: The color in which the specified string should be
+ * printed; the interpretation of the value is
+ * driver-specific, and possible values should be defined
+ * e.g. in a driver include file.
+ * @text: The string data that should be printed on the OSD
+ * @return 0 if OK, -ve on error.
+ */
+ int (*print)(struct udevice *dev, uint col, uint row, ulong color,
+ char *text);
+};
+
+#define video_osd_get_ops(dev) ((struct video_osd_ops *)(dev)->driver->ops)
+
+/**
+ * video_osd_get_info() - Get information about a OSD instance
+ *
+ * A OSD instance may keep some internal data about itself. This function can
+ * be used to access this data.
+ *
+ * @dev: OSD instance to query.
+ * @info: Pointer to a structure that takes the information read from the
+ * OSD instance.
+ * @return 0 if OK, -ve on error.
+ */
+int video_osd_get_info(struct udevice *dev, struct video_osd_info *info);
+
+/**
+ * video_osd_set_mem() - Write text data to OSD memory
+ *
+ * The passed data are device-specific, and it's up to the driver how to
+ * interpret them. How the count parameter is interpreted is also
+ * driver-specific; most likely the given data will be written to the OSD count
+ * times back-to-back, which is e.g. convenient for filling areas of the OSD
+ * with a single character.
+ *
+ * For example a invocation of
+ *
+ * video_osd_set_mem(dev, 0, 0, "A", 1, 10);
+ *
+ * will write the device-specific text data "A" to the positions (0, 0) to (9,
+ * 0) on the OSD.
+ *
+ * Device-specific text data may, e.g. be a special encoding of glyphs to
+ * display and color values in binary format.
+ *
+ * @dev: OSD instance to write to.
+ * @col: Horizontal character coordinate to write to.
+ * @row Vertical character coordinate to write to.
+ * @buf: Array containing device-specific data to write to the specified
+ * coordinate on the OSD screen.
+ * @buflen: Length of the data in the passed buffer (in byte).
+ * @count: Write count many repetitions of the given text data
+ * @return 0 if OK, -ve on error.
+ */
+int video_osd_set_mem(struct udevice *dev, uint col, uint row, u8 *buf,
+ size_t buflen, uint count);
+
+/**
+ * video_osd_set_size() - Set the position and dimension of the OSD's
+ * writeable window
+ *
+ * @dev: OSD instance to write to.
+ * @col The number of characters in the window's columns
+ * @row The number of characters in the window's rows
+ * @return 0 if OK, -ve on error.
+ */
+int video_osd_set_size(struct udevice *dev, uint col, uint row);
+
+/**
+ * video_osd_print() - Print a string in a given color to specified coordinates
+ * on the OSD
+ *
+ * @dev: OSD instance to write to.
+ * @col The x-coordinate of the position the string should be written
+ * to
+ * @row The y-coordinate of the position the string should be written
+ * to
+ * @color: The color in which the specified string should be printed; the
+ * interpretation of the value is driver-specific, and possible
+ * values should be defined e.g. in a driver include file.
+ * @text: The string data that should be printed on the OSD
+ * @return 0 if OK, -ve on error.
+ */
+int video_osd_print(struct udevice *dev, uint col, uint row, ulong color,
+ char *text);
+
+#endif /* !_VIDEO_OSD_H_ */
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