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>master
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config VIDEO_BRIDGE |
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bool "Support video bridges" |
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depends on DM |
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help |
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Some platforms use video bridges to convert from one output to |
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another. For example, where the SoC only supports eDP and the LCD |
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requires LVDS, an eDP->LVDS bridge chip can be used to provide the |
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necessary conversion. This option enables support for these devices. |
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#
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# Copyright (C) 2015 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# SPDX-License-Identifier: GPL-2.0+
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obj-$(CONFIG_VIDEO_BRIDGE) += video-bridge-uclass.o
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/*
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* Copyright (C) 2015 Google, Inc |
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* Written by Simon Glass <sjg@chromium.org> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <video_bridge.h> |
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int video_bridge_set_backlight(struct udevice *dev, int percent) |
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{ |
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struct video_bridge_ops *ops = video_bridge_get_ops(dev); |
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if (!ops->set_backlight) |
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return -ENOSYS; |
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return ops->set_backlight(dev, percent); |
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} |
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int video_bridge_attach(struct udevice *dev) |
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{ |
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struct video_bridge_ops *ops = video_bridge_get_ops(dev); |
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if (!ops->attach) |
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return -ENOSYS; |
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return ops->attach(dev); |
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} |
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int video_bridge_check_attached(struct udevice *dev) |
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{ |
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struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); |
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struct video_bridge_ops *ops = video_bridge_get_ops(dev); |
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int ret; |
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if (!ops->check_attached) { |
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ret = dm_gpio_get_value(&uc_priv->hotplug); |
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return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret; |
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} |
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return ops->check_attached(dev); |
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} |
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static int video_bridge_pre_probe(struct udevice *dev) |
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{ |
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struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); |
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int ret; |
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debug("%s\n", __func__); |
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ret = gpio_request_by_name(dev, "sleep-gpios", 0, |
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&uc_priv->sleep, GPIOD_IS_OUT); |
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if (ret) { |
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debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret); |
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return ret; |
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} |
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ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE); |
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if (ret) { |
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debug("%s: Could not set sleep pull value\n", __func__); |
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return ret; |
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} |
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ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset, |
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GPIOD_IS_OUT); |
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if (ret) { |
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debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret); |
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return ret; |
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} |
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ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE); |
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if (ret) { |
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debug("%s: Could not set reset pull value\n", __func__); |
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return ret; |
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} |
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ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug, |
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GPIOD_IS_IN); |
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if (ret && ret != -ENOENT) { |
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debug("%s: Could not decode hotplug (%d)\n", __func__, ret); |
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return ret; |
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} |
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return 0; |
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} |
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int video_bridge_set_active(struct udevice *dev, bool active) |
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{ |
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struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); |
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int ret; |
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debug("%s: %d\n", __func__, active); |
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ret = dm_gpio_set_value(&uc_priv->sleep, !active); |
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if (ret) |
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return ret; |
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if (active) { |
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ret = dm_gpio_set_value(&uc_priv->reset, true); |
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if (ret) |
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return ret; |
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udelay(10); |
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ret = dm_gpio_set_value(&uc_priv->reset, false); |
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} |
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return ret; |
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} |
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UCLASS_DRIVER(video_bridge) = { |
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.id = UCLASS_VIDEO_BRIDGE, |
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.name = "video_bridge", |
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.per_device_auto_alloc_size = sizeof(struct video_bridge_priv), |
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.pre_probe = video_bridge_pre_probe, |
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}; |
@ -0,0 +1,92 @@ |
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/*
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* Copyright (C) 2015 Google, Inc |
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* Written by Simon Glass <sjg@chromium.org> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#ifndef __VIDEO_BRIDGE |
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#define __VIDEO_BRIDGE |
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#include <asm/gpio.h> |
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/**
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* struct video_bridge_priv - uclass information for video bridges |
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* |
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* @sleep: GPIO to assert to power down the bridge |
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* @reset: GPIO to assert to reset the bridge |
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* @hotplug: Optional GPIO to check if bridge is connected |
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*/ |
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struct video_bridge_priv { |
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struct gpio_desc sleep; |
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struct gpio_desc reset; |
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struct gpio_desc hotplug; |
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}; |
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/**
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* Operations for video bridges |
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*/ |
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struct video_bridge_ops { |
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/**
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* attach() - attach a video bridge |
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* |
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* @return 0 if OK, -ve on error |
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*/ |
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int (*attach)(struct udevice *dev); |
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/**
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* check_attached() - check if a bridge is correctly attached |
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* |
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* This method is optional - if not provided then the hotplug GPIO |
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* will be checked instead. |
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* |
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* @dev: Device to check |
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* @return 0 if attached, -EENOTCONN if not, or other -ve error |
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*/ |
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int (*check_attached)(struct udevice *dev); |
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/**
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* set_backlight() - Set the backlight brightness |
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* |
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* @dev: device to adjust |
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* @percent: brightness percentage (0=off, 100=full brightness) |
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* @return 0 if OK, -ve on error |
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*/ |
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int (*set_backlight)(struct udevice *dev, int percent); |
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}; |
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#define video_bridge_get_ops(dev) \ |
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((struct video_bridge_ops *)(dev)->driver->ops) |
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/**
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* video_bridge_attach() - attach a video bridge |
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* |
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* @return 0 if OK, -ve on error |
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*/ |
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int video_bridge_attach(struct udevice *dev); |
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/**
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* video_bridge_set_backlight() - Set the backlight brightness |
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* |
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* @percent: brightness percentage (0=off, 100=full brightness) |
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* @return 0 if OK, -ve on error |
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*/ |
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int video_bridge_set_backlight(struct udevice *dev, int percent); |
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/**
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* video_bridge_set_active() - take the bridge in/out of reset/powerdown |
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* |
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* @dev: Device to adjust |
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* @active: true to power up and reset, false to power down |
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*/ |
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int video_bridge_set_active(struct udevice *dev, bool active); |
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/**
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* check_attached() - check if a bridge is correctly attached |
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* |
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* @dev: Device to check |
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* @return 0 if attached, -EENOTCONN if not, or other -ve error |
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*/ |
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int video_bridge_check_attached(struct udevice *dev); |
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#endif |
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