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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2025 Svyatoslav Ryhel <clamor95@gmail.com>
* Loosely based on Linux lvds-codec.c driver
*/
#include <dm.h>
#include <dm/ofnode_graph.h>
#include <log.h>
#include <panel.h>
#include <video_bridge.h>
#include <asm/gpio.h>
#include <power/regulator.h>
struct lvds_codec_priv {
struct udevice *panel;
struct display_timing timing;
struct gpio_desc powerdown_gpio;
struct udevice *power;
};
static int lvds_codec_attach(struct udevice *dev)
{
struct lvds_codec_priv *priv = dev_get_priv(dev);
regulator_set_enable_if_allowed(priv->power, 1);
dm_gpio_set_value(&priv->powerdown_gpio, 0);
return panel_enable_backlight(priv->panel);
}
static int lvds_codec_set_panel(struct udevice *dev, int percent)
{
struct lvds_codec_priv *priv = dev_get_priv(dev);
return panel_set_backlight(priv->panel, percent);
}
static int lvds_codec_panel_timings(struct udevice *dev,
struct display_timing *timing)
{
struct lvds_codec_priv *priv = dev_get_priv(dev);
memcpy(timing, &priv->timing, sizeof(*timing));
return 0;
}
/* Function is purely for sandbox testing */
static int lvds_codec_read_edid(struct udevice *dev, u8 *buf, int buf_size)
{
return 0;
}
static int lvds_codec_get_panel(struct udevice *dev)
{
struct lvds_codec_priv *priv = dev_get_priv(dev);
int i, ret;
u32 num = ofnode_graph_get_port_count(dev_ofnode(dev));
for (i = 0; i < num; i++) {
ofnode remote = ofnode_graph_get_remote_node(dev_ofnode(dev), i, -1);
ret = uclass_get_device_by_of_offset(UCLASS_PANEL,
ofnode_to_offset(remote),
&priv->panel);
if (!ret)
return 0;
}
/* If this point is reached, no panels were found */
return -ENODEV;
}
static int lvds_codec_probe(struct udevice *dev)
{
struct lvds_codec_priv *priv = dev_get_priv(dev);
int ret;
ret = lvds_codec_get_panel(dev);
if (ret) {
log_debug("%s: cannot get panel: ret=%d\n", __func__, ret);
return log_ret(ret);
}
panel_get_display_timing(priv->panel, &priv->timing);
ret = gpio_request_by_name(dev, "powerdown-gpios", 0,
&priv->powerdown_gpio, GPIOD_IS_OUT);
if (ret) {
log_debug("%s: could not get powerdown-gpios (%d)\n", __func__, ret);
if (ret != -ENOENT)
return log_ret(ret);
}
ret = device_get_supply_regulator(dev, "power-supply", &priv->power);
if (ret) {
log_debug("%s: power regulator error: %d\n", __func__, ret);
if (ret != -ENOENT)
return log_ret(ret);
}
return 0;
}
static const struct video_bridge_ops lvds_codec_ops = {
.attach = lvds_codec_attach,
.set_backlight = lvds_codec_set_panel,
.get_display_timing = lvds_codec_panel_timings,
.read_edid = lvds_codec_read_edid,
};
static const struct udevice_id lvds_codec_ids[] = {
{ .compatible = "lvds-decoder" },
{ .compatible = "lvds-encoder" },
{ }
};
U_BOOT_DRIVER(lvds_codec) = {
.name = "lvds_codec",
.id = UCLASS_VIDEO_BRIDGE,
.of_match = lvds_codec_ids,
.ops = &lvds_codec_ops,
.probe = lvds_codec_probe,
.priv_auto = sizeof(struct lvds_codec_priv),
};
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