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https://source.denx.de/u-boot/u-boot.git
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897b63d58c
Add a simple and transparent LVDS de/encoder driver with a powerdown gpio and a power supply. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2025 Svyatoslav Ryhel <clamor95@gmail.com>
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* Loosely based on Linux lvds-codec.c driver
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*/
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#include <dm.h>
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#include <dm/ofnode_graph.h>
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#include <log.h>
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#include <panel.h>
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#include <video_bridge.h>
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#include <asm/gpio.h>
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#include <power/regulator.h>
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struct lvds_codec_priv {
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struct udevice *panel;
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struct display_timing timing;
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struct gpio_desc powerdown_gpio;
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struct udevice *power;
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};
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static int lvds_codec_attach(struct udevice *dev)
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{
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struct lvds_codec_priv *priv = dev_get_priv(dev);
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regulator_set_enable_if_allowed(priv->power, 1);
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dm_gpio_set_value(&priv->powerdown_gpio, 0);
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return panel_enable_backlight(priv->panel);
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}
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static int lvds_codec_set_panel(struct udevice *dev, int percent)
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{
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struct lvds_codec_priv *priv = dev_get_priv(dev);
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return panel_set_backlight(priv->panel, percent);
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}
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static int lvds_codec_panel_timings(struct udevice *dev,
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struct display_timing *timing)
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{
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struct lvds_codec_priv *priv = dev_get_priv(dev);
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memcpy(timing, &priv->timing, sizeof(*timing));
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return 0;
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}
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/* Function is purely for sandbox testing */
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static int lvds_codec_read_edid(struct udevice *dev, u8 *buf, int buf_size)
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{
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return 0;
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}
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static int lvds_codec_get_panel(struct udevice *dev)
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{
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struct lvds_codec_priv *priv = dev_get_priv(dev);
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int i, ret;
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u32 num = ofnode_graph_get_port_count(dev_ofnode(dev));
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for (i = 0; i < num; i++) {
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ofnode remote = ofnode_graph_get_remote_node(dev_ofnode(dev), i, -1);
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ret = uclass_get_device_by_of_offset(UCLASS_PANEL,
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ofnode_to_offset(remote),
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&priv->panel);
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if (!ret)
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return 0;
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}
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/* If this point is reached, no panels were found */
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return -ENODEV;
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}
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static int lvds_codec_probe(struct udevice *dev)
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{
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struct lvds_codec_priv *priv = dev_get_priv(dev);
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int ret;
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ret = lvds_codec_get_panel(dev);
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if (ret) {
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log_debug("%s: cannot get panel: ret=%d\n", __func__, ret);
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return log_ret(ret);
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}
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panel_get_display_timing(priv->panel, &priv->timing);
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ret = gpio_request_by_name(dev, "powerdown-gpios", 0,
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&priv->powerdown_gpio, GPIOD_IS_OUT);
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if (ret) {
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log_debug("%s: could not get powerdown-gpios (%d)\n", __func__, ret);
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if (ret != -ENOENT)
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return log_ret(ret);
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}
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ret = device_get_supply_regulator(dev, "power-supply", &priv->power);
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if (ret) {
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log_debug("%s: power regulator error: %d\n", __func__, ret);
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if (ret != -ENOENT)
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return log_ret(ret);
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}
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return 0;
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}
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static const struct video_bridge_ops lvds_codec_ops = {
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.attach = lvds_codec_attach,
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.set_backlight = lvds_codec_set_panel,
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.get_display_timing = lvds_codec_panel_timings,
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.read_edid = lvds_codec_read_edid,
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};
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static const struct udevice_id lvds_codec_ids[] = {
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{ .compatible = "lvds-decoder" },
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{ .compatible = "lvds-encoder" },
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{ }
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};
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U_BOOT_DRIVER(lvds_codec) = {
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.name = "lvds_codec",
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.id = UCLASS_VIDEO_BRIDGE,
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.of_match = lvds_codec_ids,
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.ops = &lvds_codec_ops,
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.probe = lvds_codec_probe,
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.priv_auto = sizeof(struct lvds_codec_priv),
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};
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