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dm: video: Add support for video bridges

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A video bridge typically converts video from one format to another, e.g.
DisplayPort to LVDS. Add driver model support for these with a simple
interface to control activation and backlight. The uclass supports GPIO
control of power and reset lines.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-07-02 18:16:08 -06:00
parent 224d1ddcc5
commit 801ab9e93c
7 changed files with 223 additions and 0 deletions
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92
include/video_bridge.h Normal file
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/*
* Copyright (C) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __VIDEO_BRIDGE
#define __VIDEO_BRIDGE
#include <asm/gpio.h>
/**
* struct video_bridge_priv - uclass information for video bridges
*
* @sleep: GPIO to assert to power down the bridge
* @reset: GPIO to assert to reset the bridge
* @hotplug: Optional GPIO to check if bridge is connected
*/
struct video_bridge_priv {
struct gpio_desc sleep;
struct gpio_desc reset;
struct gpio_desc hotplug;
};
/**
* Operations for video bridges
*/
struct video_bridge_ops {
/**
* attach() - attach a video bridge
*
* @return 0 if OK, -ve on error
*/
int (*attach)(struct udevice *dev);
/**
* check_attached() - check if a bridge is correctly attached
*
* This method is optional - if not provided then the hotplug GPIO
* will be checked instead.
*
* @dev: Device to check
* @return 0 if attached, -EENOTCONN if not, or other -ve error
*/
int (*check_attached)(struct udevice *dev);
/**
* set_backlight() - Set the backlight brightness
*
* @dev: device to adjust
* @percent: brightness percentage (0=off, 100=full brightness)
* @return 0 if OK, -ve on error
*/
int (*set_backlight)(struct udevice *dev, int percent);
};
#define video_bridge_get_ops(dev) \
((struct video_bridge_ops *)(dev)->driver->ops)
/**
* video_bridge_attach() - attach a video bridge
*
* @return 0 if OK, -ve on error
*/
int video_bridge_attach(struct udevice *dev);
/**
* video_bridge_set_backlight() - Set the backlight brightness
*
* @percent: brightness percentage (0=off, 100=full brightness)
* @return 0 if OK, -ve on error
*/
int video_bridge_set_backlight(struct udevice *dev, int percent);
/**
* video_bridge_set_active() - take the bridge in/out of reset/powerdown
*
* @dev: Device to adjust
* @active: true to power up and reset, false to power down
*/
int video_bridge_set_active(struct udevice *dev, bool active);
/**
* check_attached() - check if a bridge is correctly attached
*
* @dev: Device to check
* @return 0 if attached, -EENOTCONN if not, or other -ve error
*/
int video_bridge_check_attached(struct udevice *dev);
#endif