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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2025 Ion Agorria <[email protected]>
*/
#include <clk.h>
#include <dm.h>
#include <dm/ofnode_graph.h>
#include <i2c.h>
#include <log.h>
#include <backlight.h>
#include <panel.h>
#include <video_bridge.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <power/regulator.h>
#include <asm/gpio.h>
static const char * const cmc623_supplies[] = {
"vdd3v0-supply", "vdd1v2-supply", "vddio1v8-supply"
};
struct cmc623_priv {
struct udevice *panel;
struct display_timing timing;
struct udevice *supplies[ARRAY_SIZE(cmc623_supplies)];
struct gpio_desc enable_gpio; /* also known as FAILSAFE */
struct gpio_desc bypass_gpio;
};
static int cmc623_attach(struct udevice *dev)
{
struct cmc623_priv *priv = dev_get_priv(dev);
int ret;
/* Perform panel setup */
ret = panel_enable_backlight(priv->panel);
if (ret)
return ret;
return 0;
}
static int cmc623_set_backlight(struct udevice *dev, int percent)
{
struct cmc623_priv *priv = dev_get_priv(dev);
return panel_set_backlight(priv->panel, percent);
}
static int cmc623_panel_timings(struct udevice *dev, struct display_timing *timing)
{
struct cmc623_priv *priv = dev_get_priv(dev);
memcpy(timing, &priv->timing, sizeof(*timing));
return 0;
}
static int cmc623_hw_init(struct udevice *dev)
{
struct cmc623_priv *priv = dev_get_priv(dev);
struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
int i, ret;
/* enable supplies */
for (i = 0; i < ARRAY_SIZE(cmc623_supplies); i++) {
ret = regulator_set_enable_if_allowed(priv->supplies[i], 1);
if (ret) {
log_debug("%s: cannot enable %s %d\n", __func__,
cmc623_supplies[i], ret);
return ret;
}
}
mdelay(10);
ret = dm_gpio_set_value(&uc_priv->reset, 1);
if (ret) {
log_debug("%s: error at reset = 1 (%d)\n", __func__, ret);
return ret;
}
ret = dm_gpio_set_value(&priv->enable_gpio, 0);
if (ret) {
log_debug("%s: error at enable = 0 (%d)\n", __func__, ret);
return ret;
}
ret = dm_gpio_set_value(&priv->bypass_gpio, 0);
if (ret) {
log_debug("%s: error at bypass = 0 (%d)\n", __func__, ret);
return ret;
}
ret = dm_gpio_set_value(&uc_priv->sleep, 0);
if (ret) {
log_debug("%s: error at sleep = 0 (%d)\n", __func__, ret);
return ret;
}
udelay(2000);
ret = dm_gpio_set_value(&priv->enable_gpio, 1);
if (ret) {
log_debug("%s: error at enable = 1 (%d)\n", __func__, ret);
return ret;
}
udelay(2000);
ret = dm_gpio_set_value(&priv->bypass_gpio, 1);
if (ret) {
log_debug("%s: error at bypass = 1 (%d)\n", __func__, ret);
return ret;
}
udelay(2000);
ret = dm_gpio_set_value(&uc_priv->sleep, 1);
if (ret) {
log_debug("%s: error at sleep = 1 (%d)\n", __func__, ret);
return ret;
}
udelay(2000);
ret = dm_gpio_set_value(&uc_priv->reset, 0);
if (ret) {
log_debug("%s: error at sleep = 0 (%d)\n", __func__, ret);
return ret;
}
mdelay(10);
ret = dm_gpio_set_value(&uc_priv->reset, 1);
if (ret) {
log_debug("%s: error at sleep = 1 (%d)\n", __func__, ret);
return ret;
}
mdelay(10);
return 0;
}
static int cmc623_get_panel(struct udevice *dev)
{
struct cmc623_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_ofnode(UCLASS_PANEL, remote, &priv->panel);
if (!ret)
return 0;
}
/* If this point is reached, no panels were found */
return -ENODEV;
}
static int cmc623_probe(struct udevice *dev)
{
struct cmc623_priv *priv = dev_get_priv(dev);
int i, ret;
/* get supplies */
for (i = 0; i < ARRAY_SIZE(cmc623_supplies); i++) {
ret = device_get_supply_regulator(dev, cmc623_supplies[i], &priv->supplies[i]);
if (ret) {
log_debug("%s: cannot get %s %d\n", __func__, cmc623_supplies[i], ret);
if (ret != -ENOENT)
return log_ret(ret);
}
}
/* get control gpios */
ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable_gpio, GPIOD_IS_OUT);
if (ret) {
log_debug("%s: could not get enable-gpios (%d)\n", __func__, ret);
return ret;
}
ret = gpio_request_by_name(dev, "bypass-gpios", 0, &priv->bypass_gpio, GPIOD_IS_OUT);
if (ret) {
log_debug("%s: could not get bypass-gpios (%d)\n", __func__, ret);
return ret;
}
ret = cmc623_hw_init(dev);
if (ret) {
log_debug("%s: error doing hw init, ret %d\n", __func__, ret);
return ret;
}
ret = cmc623_get_panel(dev);
if (ret) {
log_debug("%s: panel not found, ret %d\n", __func__, ret);
return ret;
}
panel_get_display_timing(priv->panel, &priv->timing);
return 0;
}
static const struct video_bridge_ops cmc623_ops = {
.attach = cmc623_attach,
.set_backlight = cmc623_set_backlight,
.get_display_timing = cmc623_panel_timings,
};
static const struct udevice_id cmc623_ids[] = {
{ .compatible = "samsung,cmc623" },
{ }
};
U_BOOT_DRIVER(samsung_cmc623) = {
.name = "samsung_cmc623",
.id = UCLASS_VIDEO_BRIDGE,
.of_match = cmc623_ids,
.ops = &cmc623_ops,
.bind = dm_scan_fdt_dev,
.probe = cmc623_probe,
.priv_auto = sizeof(struct cmc623_priv),
};
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