[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / bridge / ptn3460.c

/*
 * NXP PTN3460 DP/LVDS bridge driver
 *
 * Copyright (C) 2013 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_graph.h>

#include <drm/drm_panel.h>

#include "drm_crtc.h"
#include "drm_crtc_helper.h"
#include "drm_edid.h"
#include "drmP.h"

#define PTN3460_EDID_ADDR			0x0
#define PTN3460_EDID_EMULATION_ADDR		0x84
#define PTN3460_EDID_ENABLE_EMULATION		0
#define PTN3460_EDID_EMULATION_SELECTION	1
#define PTN3460_EDID_SRAM_LOAD_ADDR		0x85

struct ptn3460_bridge {
	struct drm_connector connector;
	struct i2c_client *client;
	struct drm_bridge bridge;
	struct edid *edid;
	struct drm_panel *panel;
	struct gpio_desc *gpio_pd_n;
	struct gpio_desc *gpio_rst_n;
	u32 edid_emulation;
	bool enabled;
};

static inline struct ptn3460_bridge *
		bridge_to_ptn3460(struct drm_bridge *bridge)
{
	return container_of(bridge, struct ptn3460_bridge, bridge);
}

static inline struct ptn3460_bridge *
		connector_to_ptn3460(struct drm_connector *connector)
{
	return container_of(connector, struct ptn3460_bridge, connector);
}

static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
		u8 *buf, int len)
{
	int ret;

	ret = i2c_master_send(ptn_bridge->client, &addr, 1);
	if (ret <= 0) {
		DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
		return ret;
	}

	ret = i2c_master_recv(ptn_bridge->client, buf, len);
	if (ret <= 0) {
		DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
		return ret;
	}

	return 0;
}

static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
		char val)
{
	int ret;
	char buf[2];

	buf[0] = addr;
	buf[1] = val;

	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
	if (ret <= 0) {
		DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
		return ret;
	}

	return 0;
}

static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
{
	int ret;
	char val;

	/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
			ptn_bridge->edid_emulation);
	if (ret) {
		DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
		return ret;
	}

	/* Enable EDID emulation and select the desired EDID */
	val = 1 << PTN3460_EDID_ENABLE_EMULATION |
		ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;

	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
	if (ret) {
		DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
		return ret;
	}

	return 0;
}

static void ptn3460_pre_enable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	int ret;

	if (ptn_bridge->enabled)
		return;

	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);

	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
	usleep_range(10, 20);
	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);

	if (drm_panel_prepare(ptn_bridge->panel)) {
		DRM_ERROR("failed to prepare panel\n");
		return;
	}

	/*
	 * There's a bug in the PTN chip where it falsely asserts hotplug before
	 * it is fully functional. We're forced to wait for the maximum start up
	 * time specified in the chip's datasheet to make sure we're really up.
	 */
	msleep(90);

	ret = ptn3460_select_edid(ptn_bridge);
	if (ret)
		DRM_ERROR("Select EDID failed ret=%d\n", ret);

	ptn_bridge->enabled = true;
}

static void ptn3460_enable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);

	if (drm_panel_enable(ptn_bridge->panel)) {
		DRM_ERROR("failed to enable panel\n");
		return;
	}
}

static void ptn3460_disable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);

	if (!ptn_bridge->enabled)
		return;

	ptn_bridge->enabled = false;

	if (drm_panel_disable(ptn_bridge->panel)) {
		DRM_ERROR("failed to disable panel\n");
		return;
	}

	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
}

static void ptn3460_post_disable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);

	if (drm_panel_unprepare(ptn_bridge->panel)) {
		DRM_ERROR("failed to unprepare panel\n");
		return;
	}
}

static int ptn3460_get_modes(struct drm_connector *connector)
{
	struct ptn3460_bridge *ptn_bridge;
	u8 *edid;
	int ret, num_modes = 0;
	bool power_off;

	ptn_bridge = connector_to_ptn3460(connector);

	if (ptn_bridge->edid)
		return drm_add_edid_modes(connector, ptn_bridge->edid);

	power_off = !ptn_bridge->enabled;
	ptn3460_pre_enable(&ptn_bridge->bridge);

	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	if (!edid) {
		DRM_ERROR("Failed to allocate EDID\n");
		return 0;
	}

	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
			EDID_LENGTH);
	if (ret) {
		kfree(edid);
		goto out;
	}

	ptn_bridge->edid = (struct edid *)edid;
	drm_mode_connector_update_edid_property(connector, ptn_bridge->edid);

	num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);

out:
	if (power_off)
		ptn3460_disable(&ptn_bridge->bridge);

	return num_modes;
}

static struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector)
{
	struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);

	return ptn_bridge->bridge.encoder;
}

static struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
	.get_modes = ptn3460_get_modes,
	.best_encoder = ptn3460_best_encoder,
};

static enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
		bool force)
{
	return connector_status_connected;
}

static void ptn3460_connector_destroy(struct drm_connector *connector)
{
	drm_connector_cleanup(connector);
}

static struct drm_connector_funcs ptn3460_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = ptn3460_detect,
	.destroy = ptn3460_connector_destroy,
};

static int ptn3460_bridge_attach(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	int ret;

	if (!bridge->encoder) {
		DRM_ERROR("Parent encoder object not found");
		return -ENODEV;
	}

	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
			&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	if (ret) {
		DRM_ERROR("Failed to initialize connector with drm\n");
		return ret;
	}
	drm_connector_helper_add(&ptn_bridge->connector,
					&ptn3460_connector_helper_funcs);
	drm_connector_register(&ptn_bridge->connector);
	drm_mode_connector_attach_encoder(&ptn_bridge->connector,
							bridge->encoder);

	if (ptn_bridge->panel)
		drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);

	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);

	return ret;
}

static struct drm_bridge_funcs ptn3460_bridge_funcs = {
	.pre_enable = ptn3460_pre_enable,
	.enable = ptn3460_enable,
	.disable = ptn3460_disable,
	.post_disable = ptn3460_post_disable,
	.attach = ptn3460_bridge_attach,
};

static int ptn3460_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct ptn3460_bridge *ptn_bridge;
	struct device_node *endpoint, *panel_node;
	int ret;

	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
	if (!ptn_bridge) {
		return -ENOMEM;
	}

	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
	if (endpoint) {
		panel_node = of_graph_get_remote_port_parent(endpoint);
		if (panel_node) {
			ptn_bridge->panel = of_drm_find_panel(panel_node);
			of_node_put(panel_node);
			if (!ptn_bridge->panel)
				return -EPROBE_DEFER;
		}
	}

	ptn_bridge->client = client;

	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
					       GPIOD_OUT_HIGH);
	if (IS_ERR(ptn_bridge->gpio_pd_n)) {
		ret = PTR_ERR(ptn_bridge->gpio_pd_n);
		dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
		return ret;
	}

	/*
	 * Request the reset pin low to avoid the bridge being
	 * initialized prematurely
	 */
	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
						GPIOD_OUT_LOW);
	if (IS_ERR(ptn_bridge->gpio_rst_n)) {
		ret = PTR_ERR(ptn_bridge->gpio_rst_n);
		DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
		return ret;
	}

	ret = of_property_read_u32(dev->of_node, "edid-emulation",
			&ptn_bridge->edid_emulation);
	if (ret) {
		dev_err(dev, "Can't read EDID emulation value\n");
		return ret;
	}

	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
	ptn_bridge->bridge.of_node = dev->of_node;
	ret = drm_bridge_add(&ptn_bridge->bridge);
	if (ret) {
		DRM_ERROR("Failed to add bridge\n");
		return ret;
	}

	i2c_set_clientdata(client, ptn_bridge);

	return 0;
}

static int ptn3460_remove(struct i2c_client *client)
{
	struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);

	drm_bridge_remove(&ptn_bridge->bridge);

	return 0;
}

static const struct i2c_device_id ptn3460_i2c_table[] = {
	{"ptn3460", 0},
	{},
};
MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);

static const struct of_device_id ptn3460_match[] = {
	{ .compatible = "nxp,ptn3460" },
	{},
};
MODULE_DEVICE_TABLE(of, ptn3460_match);

static struct i2c_driver ptn3460_driver = {
	.id_table	= ptn3460_i2c_table,
	.probe		= ptn3460_probe,
	.remove		= ptn3460_remove,
	.driver		= {
		.name	= "nxp,ptn3460",
		.owner	= THIS_MODULE,
		.of_match_table = ptn3460_match,
	},
};
module_i2c_driver(ptn3460_driver);

MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
a9fe713d SP	1	/*
	2	* NXP PTN3460 DP/LVDS bridge driver
	3	*
	4	* Copyright (C) 2013 Google, Inc.
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
94d50d57 AK	16	#include <linux/delay.h>
94d50d57 AK	17	#include <linux/gpio.h>
dad3c350	18	#include <linux/gpio/consumer.h>
94d50d57	19	#include <linux/i2c.h>
a9fe713d SP	20	#include <linux/module.h>
	21	#include <linux/of.h>
	22	#include <linux/of_gpio.h>
5bbb9a2e AK	23	#include <linux/of_graph.h>
	24
	25	#include <drm/drm_panel.h>
a9fe713d	26
a9fe713d SP	27	#include "drm_crtc.h"
a9fe713d SP	28	#include "drm_crtc_helper.h"
94d50d57 AK	29	#include "drm_edid.h"
94d50d57 AK	30	#include "drmP.h"
a9fe713d SP	31
	32	#define PTN3460_EDID_ADDR 0x0
	33	#define PTN3460_EDID_EMULATION_ADDR 0x84
	34	#define PTN3460_EDID_ENABLE_EMULATION 0
	35	#define PTN3460_EDID_EMULATION_SELECTION 1
	36	#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
	37
	38	struct ptn3460_bridge {
	39	struct drm_connector connector;
	40	struct i2c_client *client;
94d50d57	41	struct drm_bridge bridge;
a9fe713d	42	struct edid *edid;
5bbb9a2e	43	struct drm_panel *panel;
af478d88 AK	44	struct gpio_desc *gpio_pd_n;
af478d88 AK	45	struct gpio_desc *gpio_rst_n;
a9fe713d SP	46	u32 edid_emulation;
	47	bool enabled;
	48	};
	49
94d50d57 AK	50	static inline struct ptn3460_bridge *
	51	bridge_to_ptn3460(struct drm_bridge *bridge)
	52	{
	53	return container_of(bridge, struct ptn3460_bridge, bridge);
	54	}
	55
	56	static inline struct ptn3460_bridge *
	57	connector_to_ptn3460(struct drm_connector *connector)
	58	{
	59	return container_of(connector, struct ptn3460_bridge, connector);
	60	}
	61
a9fe713d SP	62	static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
	63	u8 *buf, int len)
	64	{
	65	int ret;
	66
	67	ret = i2c_master_send(ptn_bridge->client, &addr, 1);
	68	if (ret <= 0) {
	69	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	70	return ret;
	71	}
	72
	73	ret = i2c_master_recv(ptn_bridge->client, buf, len);
	74	if (ret <= 0) {
	75	DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
	76	return ret;
	77	}
	78
	79	return 0;
	80	}
	81
	82	static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
	83	char val)
	84	{
	85	int ret;
	86	char buf[2];
	87
	88	buf[0] = addr;
	89	buf[1] = val;
	90
	91	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
	92	if (ret <= 0) {
	93	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	94	return ret;
	95	}
	96
	97	return 0;
	98	}
	99
	100	static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
	101	{
	102	int ret;
	103	char val;
	104
	105	/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
	106	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
	107	ptn_bridge->edid_emulation);
	108	if (ret) {
94d50d57	109	DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
a9fe713d SP	110	return ret;
	111	}
	112
	113	/* Enable EDID emulation and select the desired EDID */
	114	val = 1 << PTN3460_EDID_ENABLE_EMULATION \|
	115	ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
	116
	117	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
	118	if (ret) {
94d50d57	119	DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
a9fe713d SP	120	return ret;
	121	}
	122
	123	return 0;
	124	}
	125
	126	static void ptn3460_pre_enable(struct drm_bridge *bridge)
	127	{
94d50d57	128	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	129	int ret;
	130
	131	if (ptn_bridge->enabled)
	132	return;
	133
af478d88	134	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
a9fe713d	135
af478d88 AK	136	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
	137	usleep_range(10, 20);
	138	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
a9fe713d	139
5bbb9a2e AK	140	if (drm_panel_prepare(ptn_bridge->panel)) {
	141	DRM_ERROR("failed to prepare panel\n");
	142	return;
	143	}
	144
a9fe713d SP	145	/*
	146	* There's a bug in the PTN chip where it falsely asserts hotplug before
	147	* it is fully functional. We're forced to wait for the maximum start up
	148	* time specified in the chip's datasheet to make sure we're really up.
	149	*/
	150	msleep(90);
	151
	152	ret = ptn3460_select_edid(ptn_bridge);
	153	if (ret)
94d50d57	154	DRM_ERROR("Select EDID failed ret=%d\n", ret);
a9fe713d SP	155
	156	ptn_bridge->enabled = true;
	157	}
	158
	159	static void ptn3460_enable(struct drm_bridge *bridge)
	160	{
5bbb9a2e AK	161	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	162
	163	if (drm_panel_enable(ptn_bridge->panel)) {
	164	DRM_ERROR("failed to enable panel\n");
	165	return;
	166	}
a9fe713d SP	167	}
	168
	169	static void ptn3460_disable(struct drm_bridge *bridge)
	170	{
94d50d57	171	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	172
	173	if (!ptn_bridge->enabled)
	174	return;
	175
	176	ptn_bridge->enabled = false;
	177
5bbb9a2e AK	178	if (drm_panel_disable(ptn_bridge->panel)) {
	179	DRM_ERROR("failed to disable panel\n");
	180	return;
	181	}
	182
af478d88 AK	183	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
af478d88 AK	184	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
a9fe713d SP	185	}
	186
	187	static void ptn3460_post_disable(struct drm_bridge *bridge)
	188	{
5bbb9a2e AK	189	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	190
	191	if (drm_panel_unprepare(ptn_bridge->panel)) {
	192	DRM_ERROR("failed to unprepare panel\n");
	193	return;
	194	}
a9fe713d SP	195	}
a9fe713d SP	196
94d50d57	197	static int ptn3460_get_modes(struct drm_connector *connector)
a9fe713d SP	198	{
	199	struct ptn3460_bridge *ptn_bridge;
	200	u8 *edid;
94d50d57	201	int ret, num_modes = 0;
a9fe713d SP	202	bool power_off;
a9fe713d SP	203
94d50d57	204	ptn_bridge = connector_to_ptn3460(connector);
a9fe713d SP	205
	206	if (ptn_bridge->edid)
	207	return drm_add_edid_modes(connector, ptn_bridge->edid);
	208
	209	power_off = !ptn_bridge->enabled;
94d50d57	210	ptn3460_pre_enable(&ptn_bridge->bridge);
a9fe713d SP	211
	212	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	213	if (!edid) {
94d50d57	214	DRM_ERROR("Failed to allocate EDID\n");
a9fe713d SP	215	return 0;
	216	}
	217
	218	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
	219	EDID_LENGTH);
	220	if (ret) {
	221	kfree(edid);
a9fe713d SP	222	goto out;
	223	}
	224
	225	ptn_bridge->edid = (struct edid *)edid;
	226	drm_mode_connector_update_edid_property(connector, ptn_bridge->edid);
	227
	228	num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
	229
	230	out:
	231	if (power_off)
94d50d57	232	ptn3460_disable(&ptn_bridge->bridge);
a9fe713d SP	233
	234	return num_modes;
	235	}
	236
94d50d57	237	static struct drm_encoder ptn3460_best_encoder(struct drm_connector connector)
a9fe713d	238	{
94d50d57	239	struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
a9fe713d	240
6a1688ae	241	return ptn_bridge->bridge.encoder;
a9fe713d SP	242	}
a9fe713d SP	243
94d50d57	244	static struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
a9fe713d	245	.get_modes = ptn3460_get_modes,
a9fe713d SP	246	.best_encoder = ptn3460_best_encoder,
	247	};
	248
94d50d57	249	static enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
a9fe713d SP	250	bool force)
	251	{
	252	return connector_status_connected;
	253	}
	254
94d50d57	255	static void ptn3460_connector_destroy(struct drm_connector *connector)
a9fe713d SP	256	{
	257	drm_connector_cleanup(connector);
	258	}
	259
94d50d57	260	static struct drm_connector_funcs ptn3460_connector_funcs = {
a9fe713d SP	261	.dpms = drm_helper_connector_dpms,
	262	.fill_modes = drm_helper_probe_single_connector_modes,
	263	.detect = ptn3460_detect,
	264	.destroy = ptn3460_connector_destroy,
	265	};
	266
df1d3069	267	static int ptn3460_bridge_attach(struct drm_bridge *bridge)
a9fe713d	268	{
6a1688ae	269	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d	270	int ret;
6a1688ae AK	271
	272	if (!bridge->encoder) {
	273	DRM_ERROR("Parent encoder object not found");
	274	return -ENODEV;
	275	}
	276
a1899953	277	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
6a1688ae AK	278	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
	279	&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	280	if (ret) {
	281	DRM_ERROR("Failed to initialize connector with drm\n");
	282	return ret;
	283	}
	284	drm_connector_helper_add(&ptn_bridge->connector,
	285	&ptn3460_connector_helper_funcs);
	286	drm_connector_register(&ptn_bridge->connector);
	287	drm_mode_connector_attach_encoder(&ptn_bridge->connector,
	288	bridge->encoder);
	289
5bbb9a2e AK	290	if (ptn_bridge->panel)
	291	drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
	292
a1899953 AK	293	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
a1899953 AK	294
6a1688ae AK	295	return ret;
	296	}
	297
	298	static struct drm_bridge_funcs ptn3460_bridge_funcs = {
	299	.pre_enable = ptn3460_pre_enable,
	300	.enable = ptn3460_enable,
	301	.disable = ptn3460_disable,
	302	.post_disable = ptn3460_post_disable,
	303	.attach = ptn3460_bridge_attach,
	304	};
	305
	306	static int ptn3460_probe(struct i2c_client *client,
	307	const struct i2c_device_id *id)
	308	{
	309	struct device *dev = &client->dev;
a9fe713d	310	struct ptn3460_bridge *ptn_bridge;
5bbb9a2e	311	struct device_node endpoint, panel_node;
6a1688ae	312	int ret;
a9fe713d	313
6a1688ae	314	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
a9fe713d	315	if (!ptn_bridge) {
a9fe713d SP	316	return -ENOMEM;
	317	}
	318
5bbb9a2e AK	319	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
	320	if (endpoint) {
	321	panel_node = of_graph_get_remote_port_parent(endpoint);
	322	if (panel_node) {
	323	ptn_bridge->panel = of_drm_find_panel(panel_node);
	324	of_node_put(panel_node);
	325	if (!ptn_bridge->panel)
	326	return -EPROBE_DEFER;
	327	}
	328	}
	329
a9fe713d	330	ptn_bridge->client = client;
af478d88	331
c06ea0ad UKK	332	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
c06ea0ad UKK	333	GPIOD_OUT_HIGH);
af478d88 AK	334	if (IS_ERR(ptn_bridge->gpio_pd_n)) {
	335	ret = PTR_ERR(ptn_bridge->gpio_pd_n);
	336	dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
	337	return ret;
a9fe713d SP	338	}
a9fe713d SP	339
af478d88 AK	340	/*
	341	* Request the reset pin low to avoid the bridge being
	342	* initialized prematurely
	343	*/
c06ea0ad UKK	344	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
	345	GPIOD_OUT_LOW);
	346	if (IS_ERR(ptn_bridge->gpio_rst_n)) {
	347	ret = PTR_ERR(ptn_bridge->gpio_rst_n);
	348	DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
af478d88	349	return ret;
a9fe713d SP	350	}
a9fe713d SP	351
6a1688ae	352	ret = of_property_read_u32(dev->of_node, "edid-emulation",
a9fe713d SP	353	&ptn_bridge->edid_emulation);
a9fe713d SP	354	if (ret) {
6a1688ae	355	dev_err(dev, "Can't read EDID emulation value\n");
af478d88	356	return ret;
a9fe713d SP	357	}
a9fe713d SP	358
b07b90fd	359	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
5bbb9a2e	360	ptn_bridge->bridge.of_node = dev->of_node;
6a1688ae	361	ret = drm_bridge_add(&ptn_bridge->bridge);
a9fe713d	362	if (ret) {
6a1688ae	363	DRM_ERROR("Failed to add bridge\n");
af478d88	364	return ret;
a9fe713d SP	365	}
a9fe713d SP	366
6a1688ae	367	i2c_set_clientdata(client, ptn_bridge);
a9fe713d SP	368
a9fe713d SP	369	return 0;
a9fe713d	370	}
3d3f8b1f	371
6a1688ae	372	static int ptn3460_remove(struct i2c_client *client)
3d3f8b1f	373	{
6a1688ae AK	374	struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
	375
	376	drm_bridge_remove(&ptn_bridge->bridge);
3d3f8b1f	377
6a1688ae	378	return 0;
3d3f8b1f	379	}
6a1688ae AK	380
6a1688ae AK	381	static const struct i2c_device_id ptn3460_i2c_table[] = {
394e5b6d	382	{"ptn3460", 0},
6a1688ae AK	383	{},
	384	};
	385	MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
	386
	387	static const struct of_device_id ptn3460_match[] = {
	388	{ .compatible = "nxp,ptn3460" },
	389	{},
	390	};
	391	MODULE_DEVICE_TABLE(of, ptn3460_match);
	392
	393	static struct i2c_driver ptn3460_driver = {
	394	.id_table = ptn3460_i2c_table,
	395	.probe = ptn3460_probe,
	396	.remove = ptn3460_remove,
	397	.driver = {
	398	.name = "nxp,ptn3460",
	399	.owner = THIS_MODULE,
	400	.of_match_table = ptn3460_match,
	401	},
	402	};
	403	module_i2c_driver(ptn3460_driver);
	404
	405	MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
	406	MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
	407	MODULE_LICENSE("GPL v2");