dm: video: Add support for video bridges
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>utp
Simon Glass
parent
224d1ddcc5
commit
801ab9e93c
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@ -240,3 +240,5 @@ config VIDEO_TEGRA124
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HDMI. At present only eDP is supported by U-Boot. This option
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enables this support which can be used on devices which
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have an eDP display connected.
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source "drivers/video/bridge/Kconfig"
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@ -54,3 +54,5 @@ obj-$(CONFIG_AM335X_LCD) += am335x-fb.o
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obj-$(CONFIG_VIDEO_PARADE) += parade.o
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obj-${CONFIG_VIDEO_TEGRA124} += tegra124/
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obj-y += bridge/
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@ -0,0 +1,8 @@
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config VIDEO_BRIDGE
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bool "Support video bridges"
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depends on DM
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help
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Some platforms use video bridges to convert from one output to
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another. For example, where the SoC only supports eDP and the LCD
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requires LVDS, an eDP->LVDS bridge chip can be used to provide the
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necessary conversion. This option enables support for these devices.
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@ -0,0 +1,7 @@
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#
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# Copyright (C) 2015 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# SPDX-License-Identifier: GPL-2.0+
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obj-$(CONFIG_VIDEO_BRIDGE) += video-bridge-uclass.o
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@ -0,0 +1,111 @@
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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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};
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@ -57,6 +57,7 @@ enum uclass_id {
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UCLASS_USB, /* USB bus */
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UCLASS_USB_DEV_GENERIC, /* USB generic device */
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UCLASS_USB_HUB, /* USB hub */
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UCLASS_VIDEO_BRIDGE, /* Video bridge, e.g. DisplayPort to LVDS */
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UCLASS_COUNT,
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UCLASS_INVALID = -1,
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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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