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>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 9ae23e8..3244cd7 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -240,3 +240,5 @@
HDMI. At present only eDP is supported by U-Boot. This option
enables this support which can be used on devices which
have an eDP display connected.
+
+source "drivers/video/bridge/Kconfig"
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 2ead7f1..599fe83 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -54,3 +54,5 @@
obj-$(CONFIG_VIDEO_PARADE) += parade.o
obj-${CONFIG_VIDEO_TEGRA124} += tegra124/
+
+obj-y += bridge/
diff --git a/drivers/video/bridge/Kconfig b/drivers/video/bridge/Kconfig
new file mode 100644
index 0000000..7ba6b17
--- /dev/null
+++ b/drivers/video/bridge/Kconfig
@@ -0,0 +1,8 @@
+config VIDEO_BRIDGE
+ bool "Support video bridges"
+ depends on DM
+ help
+ Some platforms use video bridges to convert from one output to
+ another. For example, where the SoC only supports eDP and the LCD
+ requires LVDS, an eDP->LVDS bridge chip can be used to provide the
+ necessary conversion. This option enables support for these devices.
diff --git a/drivers/video/bridge/Makefile b/drivers/video/bridge/Makefile
new file mode 100644
index 0000000..f4bf087
--- /dev/null
+++ b/drivers/video/bridge/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2015 Google, Inc
+# Written by Simon Glass <sjg@chromium.org>
+#
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-$(CONFIG_VIDEO_BRIDGE) += video-bridge-uclass.o
diff --git a/drivers/video/bridge/video-bridge-uclass.c b/drivers/video/bridge/video-bridge-uclass.c
new file mode 100644
index 0000000..e1ea428
--- /dev/null
+++ b/drivers/video/bridge/video-bridge-uclass.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <video_bridge.h>
+
+int video_bridge_set_backlight(struct udevice *dev, int percent)
+{
+ struct video_bridge_ops *ops = video_bridge_get_ops(dev);
+
+ if (!ops->set_backlight)
+ return -ENOSYS;
+
+ return ops->set_backlight(dev, percent);
+}
+
+int video_bridge_attach(struct udevice *dev)
+{
+ struct video_bridge_ops *ops = video_bridge_get_ops(dev);
+
+ if (!ops->attach)
+ return -ENOSYS;
+
+ return ops->attach(dev);
+}
+
+int video_bridge_check_attached(struct udevice *dev)
+{
+ struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct video_bridge_ops *ops = video_bridge_get_ops(dev);
+ int ret;
+
+ if (!ops->check_attached) {
+ ret = dm_gpio_get_value(&uc_priv->hotplug);
+
+ return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret;
+ }
+
+ return ops->check_attached(dev);
+}
+
+static int video_bridge_pre_probe(struct udevice *dev)
+{
+ struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
+ int ret;
+
+ debug("%s\n", __func__);
+ ret = gpio_request_by_name(dev, "sleep-gpios", 0,
+ &uc_priv->sleep, GPIOD_IS_OUT);
+ if (ret) {
+ debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret);
+ return ret;
+ }
+ ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE);
+ if (ret) {
+ debug("%s: Could not set sleep pull value\n", __func__);
+ return ret;
+ }
+ ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset,
+ GPIOD_IS_OUT);
+ if (ret) {
+ debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret);
+ return ret;
+ }
+ ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE);
+ if (ret) {
+ debug("%s: Could not set reset pull value\n", __func__);
+ return ret;
+ }
+ ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug,
+ GPIOD_IS_IN);
+ if (ret && ret != -ENOENT) {
+ debug("%s: Could not decode hotplug (%d)\n", __func__, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+int video_bridge_set_active(struct udevice *dev, bool active)
+{
+ struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
+ int ret;
+
+ debug("%s: %d\n", __func__, active);
+ ret = dm_gpio_set_value(&uc_priv->sleep, !active);
+ if (ret)
+ return ret;
+ if (active) {
+ ret = dm_gpio_set_value(&uc_priv->reset, true);
+ if (ret)
+ return ret;
+ udelay(10);
+ ret = dm_gpio_set_value(&uc_priv->reset, false);
+ }
+
+ return ret;
+}
+
+UCLASS_DRIVER(video_bridge) = {
+ .id = UCLASS_VIDEO_BRIDGE,
+ .name = "video_bridge",
+ .per_device_auto_alloc_size = sizeof(struct video_bridge_priv),
+ .pre_probe = video_bridge_pre_probe,
+};