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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * NXP PTN3460 DP/LVDS bridge driver
 *
 * Copyright (C) 2013 Google, Inc.
 */

#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 <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/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_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 const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
	.get_modes = ptn3460_get_modes,
};

static const struct drm_connector_funcs ptn3460_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = drm_connector_cleanup,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

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_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 const 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;
	int ret;

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

	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
	if (ret)
		return ret;

	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;
	drm_bridge_add(&ptn_bridge->bridge);

	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",
		.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
9c92ab61	1	// SPDX-License-Identifier: GPL-2.0-only
a9fe713d SP	2	/*
	3	* NXP PTN3460 DP/LVDS bridge driver
	4	*
	5	* Copyright (C) 2013 Google, Inc.
a9fe713d SP	6	*/
a9fe713d SP	7
94d50d57 AK	8	#include <linux/delay.h>
94d50d57 AK	9	#include <linux/gpio.h>
dad3c350	10	#include <linux/gpio/consumer.h>
94d50d57	11	#include <linux/i2c.h>
a9fe713d SP	12	#include <linux/module.h>
	13	#include <linux/of.h>
	14	#include <linux/of_gpio.h>
191436c4 MY	15	#include <drm/drm_atomic_helper.h>
191436c4 MY	16	#include <drm/drm_crtc.h>
191436c4	17	#include <drm/drm_edid.h>
ebc94461	18	#include <drm/drm_of.h>
5bbb9a2e	19	#include <drm/drm_panel.h>
fcd70cd3	20	#include <drm/drm_probe_helper.h>
191436c4	21	#include <drm/drmP.h>
a9fe713d SP	22
	23	#define PTN3460_EDID_ADDR 0x0
	24	#define PTN3460_EDID_EMULATION_ADDR 0x84
	25	#define PTN3460_EDID_ENABLE_EMULATION 0
	26	#define PTN3460_EDID_EMULATION_SELECTION 1
	27	#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
	28
	29	struct ptn3460_bridge {
	30	struct drm_connector connector;
	31	struct i2c_client *client;
94d50d57	32	struct drm_bridge bridge;
a9fe713d	33	struct edid *edid;
5bbb9a2e	34	struct drm_panel *panel;
af478d88 AK	35	struct gpio_desc *gpio_pd_n;
af478d88 AK	36	struct gpio_desc *gpio_rst_n;
a9fe713d SP	37	u32 edid_emulation;
	38	bool enabled;
	39	};
	40
94d50d57 AK	41	static inline struct ptn3460_bridge *
	42	bridge_to_ptn3460(struct drm_bridge *bridge)
	43	{
	44	return container_of(bridge, struct ptn3460_bridge, bridge);
	45	}
	46
	47	static inline struct ptn3460_bridge *
	48	connector_to_ptn3460(struct drm_connector *connector)
	49	{
	50	return container_of(connector, struct ptn3460_bridge, connector);
	51	}
	52
a9fe713d SP	53	static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
	54	u8 *buf, int len)
	55	{
	56	int ret;
	57
	58	ret = i2c_master_send(ptn_bridge->client, &addr, 1);
	59	if (ret <= 0) {
	60	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	61	return ret;
	62	}
	63
	64	ret = i2c_master_recv(ptn_bridge->client, buf, len);
	65	if (ret <= 0) {
	66	DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
	67	return ret;
	68	}
	69
	70	return 0;
	71	}
	72
	73	static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
	74	char val)
	75	{
	76	int ret;
	77	char buf[2];
	78
	79	buf[0] = addr;
	80	buf[1] = val;
	81
	82	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
	83	if (ret <= 0) {
	84	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	85	return ret;
	86	}
	87
	88	return 0;
	89	}
	90
	91	static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
	92	{
	93	int ret;
	94	char val;
	95
	96	/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
	97	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
	98	ptn_bridge->edid_emulation);
	99	if (ret) {
94d50d57	100	DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
a9fe713d SP	101	return ret;
	102	}
	103
	104	/* Enable EDID emulation and select the desired EDID */
	105	val = 1 << PTN3460_EDID_ENABLE_EMULATION \|
	106	ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
	107
	108	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
	109	if (ret) {
94d50d57	110	DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
a9fe713d SP	111	return ret;
	112	}
	113
	114	return 0;
	115	}
	116
	117	static void ptn3460_pre_enable(struct drm_bridge *bridge)
	118	{
94d50d57	119	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	120	int ret;
	121
	122	if (ptn_bridge->enabled)
	123	return;
	124
af478d88	125	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
a9fe713d	126
af478d88 AK	127	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
	128	usleep_range(10, 20);
	129	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
a9fe713d	130
5bbb9a2e AK	131	if (drm_panel_prepare(ptn_bridge->panel)) {
	132	DRM_ERROR("failed to prepare panel\n");
	133	return;
	134	}
	135
a9fe713d SP	136	/*
	137	* There's a bug in the PTN chip where it falsely asserts hotplug before
	138	* it is fully functional. We're forced to wait for the maximum start up
	139	* time specified in the chip's datasheet to make sure we're really up.
	140	*/
	141	msleep(90);
	142
	143	ret = ptn3460_select_edid(ptn_bridge);
	144	if (ret)
94d50d57	145	DRM_ERROR("Select EDID failed ret=%d\n", ret);
a9fe713d SP	146
	147	ptn_bridge->enabled = true;
	148	}
	149
	150	static void ptn3460_enable(struct drm_bridge *bridge)
	151	{
5bbb9a2e AK	152	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	153
	154	if (drm_panel_enable(ptn_bridge->panel)) {
	155	DRM_ERROR("failed to enable panel\n");
	156	return;
	157	}
a9fe713d SP	158	}
	159
	160	static void ptn3460_disable(struct drm_bridge *bridge)
	161	{
94d50d57	162	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	163
	164	if (!ptn_bridge->enabled)
	165	return;
	166
	167	ptn_bridge->enabled = false;
	168
5bbb9a2e AK	169	if (drm_panel_disable(ptn_bridge->panel)) {
	170	DRM_ERROR("failed to disable panel\n");
	171	return;
	172	}
	173
af478d88 AK	174	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
af478d88 AK	175	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
a9fe713d SP	176	}
	177
	178	static void ptn3460_post_disable(struct drm_bridge *bridge)
	179	{
5bbb9a2e AK	180	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	181
	182	if (drm_panel_unprepare(ptn_bridge->panel)) {
	183	DRM_ERROR("failed to unprepare panel\n");
	184	return;
	185	}
a9fe713d SP	186	}
a9fe713d SP	187
94d50d57	188	static int ptn3460_get_modes(struct drm_connector *connector)
a9fe713d SP	189	{
	190	struct ptn3460_bridge *ptn_bridge;
	191	u8 *edid;
94d50d57	192	int ret, num_modes = 0;
a9fe713d SP	193	bool power_off;
a9fe713d SP	194
94d50d57	195	ptn_bridge = connector_to_ptn3460(connector);
a9fe713d SP	196
	197	if (ptn_bridge->edid)
	198	return drm_add_edid_modes(connector, ptn_bridge->edid);
	199
	200	power_off = !ptn_bridge->enabled;
94d50d57	201	ptn3460_pre_enable(&ptn_bridge->bridge);
a9fe713d SP	202
	203	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	204	if (!edid) {
94d50d57	205	DRM_ERROR("Failed to allocate EDID\n");
a9fe713d SP	206	return 0;
	207	}
	208
	209	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
	210	EDID_LENGTH);
	211	if (ret) {
	212	kfree(edid);
a9fe713d SP	213	goto out;
	214	}
	215
	216	ptn_bridge->edid = (struct edid *)edid;
c555f023	217	drm_connector_update_edid_property(connector, ptn_bridge->edid);
a9fe713d SP	218
	219	num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
	220
	221	out:
	222	if (power_off)
94d50d57	223	ptn3460_disable(&ptn_bridge->bridge);
a9fe713d SP	224
	225	return num_modes;
	226	}
	227
0aba67c1	228	static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
a9fe713d	229	.get_modes = ptn3460_get_modes,
a9fe713d SP	230	};
a9fe713d SP	231
0aba67c1	232	static const struct drm_connector_funcs ptn3460_connector_funcs = {
a9fe713d	233	.fill_modes = drm_helper_probe_single_connector_modes,
bf3b123e	234	.destroy = drm_connector_cleanup,
4ea9526b GP	235	.reset = drm_atomic_helper_connector_reset,
	236	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	237	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
a9fe713d SP	238	};
a9fe713d SP	239
df1d3069	240	static int ptn3460_bridge_attach(struct drm_bridge *bridge)
a9fe713d	241	{
6a1688ae	242	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d	243	int ret;
6a1688ae AK	244
	245	if (!bridge->encoder) {
	246	DRM_ERROR("Parent encoder object not found");
	247	return -ENODEV;
	248	}
	249
a1899953	250	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
6a1688ae AK	251	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
	252	&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	253	if (ret) {
	254	DRM_ERROR("Failed to initialize connector with drm\n");
	255	return ret;
	256	}
	257	drm_connector_helper_add(&ptn_bridge->connector,
	258	&ptn3460_connector_helper_funcs);
	259	drm_connector_register(&ptn_bridge->connector);
cde4c44d	260	drm_connector_attach_encoder(&ptn_bridge->connector,
6a1688ae AK	261	bridge->encoder);
6a1688ae AK	262
5bbb9a2e AK	263	if (ptn_bridge->panel)
	264	drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
	265
a1899953 AK	266	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
a1899953 AK	267
6a1688ae AK	268	return ret;
	269	}
	270
0aba67c1	271	static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
6a1688ae AK	272	.pre_enable = ptn3460_pre_enable,
	273	.enable = ptn3460_enable,
	274	.disable = ptn3460_disable,
	275	.post_disable = ptn3460_post_disable,
	276	.attach = ptn3460_bridge_attach,
	277	};
	278
	279	static int ptn3460_probe(struct i2c_client *client,
	280	const struct i2c_device_id *id)
	281	{
	282	struct device *dev = &client->dev;
a9fe713d	283	struct ptn3460_bridge *ptn_bridge;
6a1688ae	284	int ret;
a9fe713d	285
6a1688ae	286	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
a9fe713d	287	if (!ptn_bridge) {
a9fe713d SP	288	return -ENOMEM;
	289	}
	290
ebc94461 RH	291	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
	292	if (ret)
	293	return ret;
5bbb9a2e	294
a9fe713d	295	ptn_bridge->client = client;
af478d88	296
c06ea0ad UKK	297	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
c06ea0ad UKK	298	GPIOD_OUT_HIGH);
af478d88 AK	299	if (IS_ERR(ptn_bridge->gpio_pd_n)) {
	300	ret = PTR_ERR(ptn_bridge->gpio_pd_n);
	301	dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
	302	return ret;
a9fe713d SP	303	}
a9fe713d SP	304
af478d88 AK	305	/*
	306	* Request the reset pin low to avoid the bridge being
	307	* initialized prematurely
	308	*/
c06ea0ad UKK	309	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
	310	GPIOD_OUT_LOW);
	311	if (IS_ERR(ptn_bridge->gpio_rst_n)) {
	312	ret = PTR_ERR(ptn_bridge->gpio_rst_n);
	313	DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
af478d88	314	return ret;
a9fe713d SP	315	}
a9fe713d SP	316
6a1688ae	317	ret = of_property_read_u32(dev->of_node, "edid-emulation",
a9fe713d SP	318	&ptn_bridge->edid_emulation);
a9fe713d SP	319	if (ret) {
6a1688ae	320	dev_err(dev, "Can't read EDID emulation value\n");
af478d88	321	return ret;
a9fe713d SP	322	}
a9fe713d SP	323
b07b90fd	324	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
5bbb9a2e	325	ptn_bridge->bridge.of_node = dev->of_node;
830dcb44	326	drm_bridge_add(&ptn_bridge->bridge);
a9fe713d	327
6a1688ae	328	i2c_set_clientdata(client, ptn_bridge);
a9fe713d SP	329
a9fe713d SP	330	return 0;
a9fe713d	331	}
3d3f8b1f	332
6a1688ae	333	static int ptn3460_remove(struct i2c_client *client)
3d3f8b1f	334	{
6a1688ae AK	335	struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
	336
	337	drm_bridge_remove(&ptn_bridge->bridge);
3d3f8b1f	338
6a1688ae	339	return 0;
3d3f8b1f	340	}
6a1688ae AK	341
6a1688ae AK	342	static const struct i2c_device_id ptn3460_i2c_table[] = {
394e5b6d	343	{"ptn3460", 0},
6a1688ae AK	344	{},
	345	};
	346	MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
	347
	348	static const struct of_device_id ptn3460_match[] = {
	349	{ .compatible = "nxp,ptn3460" },
	350	{},
	351	};
	352	MODULE_DEVICE_TABLE(of, ptn3460_match);
	353
	354	static struct i2c_driver ptn3460_driver = {
	355	.id_table = ptn3460_i2c_table,
	356	.probe = ptn3460_probe,
	357	.remove = ptn3460_remove,
	358	.driver = {
	359	.name = "nxp,ptn3460",
6a1688ae AK	360	.of_match_table = ptn3460_match,
	361	},
	362	};
	363	module_i2c_driver(ptn3460_driver);
	364
	365	MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
	366	MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
	367	MODULE_LICENSE("GPL v2");