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https://github.com/AsahiLinux/u-boot
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d4bf91ada1
Some video bridges will not have GPIOs to control reset, etc. Allow these to be optional. Signed-off-by: Simon Glass <sjg@chromium.org>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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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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if (ret != -ENOENT)
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return ret;
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}
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/*
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* Drop this for now as we do not have driver model pinctrl support
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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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*/
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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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if (ret != -ENOENT)
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return ret;
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}
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/*
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* Drop this for now as we do not have driver model pinctrl support
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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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*/
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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) {
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debug("%s: Could not decode hotplug (%d)\n", __func__, ret);
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if (ret != -ENOENT)
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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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