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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | // 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), }; |