[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/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.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 drm_bridge *panel_bridge;
	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);

	/*
	 * 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_disable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);

	if (!ptn_bridge->enabled)
		return;

	ptn_bridge->enabled = false;

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


static struct edid *ptn3460_get_edid(struct drm_bridge *bridge,
				     struct drm_connector *connector)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	bool power_off;
	u8 *edid;
	int ret;

	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");
		goto out;
	}

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

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

	return (struct edid *)edid;
}

static int ptn3460_connector_get_modes(struct drm_connector *connector)
{
	struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
	struct edid *edid;
	int num_modes;

	edid = ptn3460_get_edid(&ptn_bridge->bridge, connector);
	drm_connector_update_edid_property(connector, edid);
	num_modes = drm_add_edid_modes(connector, edid);
	kfree(edid);

	return num_modes;
}

static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
	.get_modes = ptn3460_connector_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,
				 enum drm_bridge_attach_flags flags)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	int ret;

	/* Let this driver create connector if requested */
	ret = drm_bridge_attach(bridge->encoder, ptn_bridge->panel_bridge,
				bridge, flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR);
	if (ret < 0)
		return ret;

	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
		return 0;

	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);

	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,
	.disable = ptn3460_disable,
	.attach = ptn3460_bridge_attach,
	.get_edid = ptn3460_get_edid,
};

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 drm_bridge *panel_bridge;
	struct drm_panel *panel;
	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, &panel, NULL);
	if (ret)
		return ret;

	panel_bridge = devm_drm_panel_bridge_add(dev, panel);
	if (IS_ERR(panel_bridge))
		return PTR_ERR(panel_bridge);

	ptn_bridge->panel_bridge = panel_bridge;
	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.ops = DRM_BRIDGE_OP_EDID;
	ptn_bridge->bridge.type = DRM_MODE_CONNECTOR_LVDS;
	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	8	#include <linux/delay.h>
dad3c350	9	#include <linux/gpio/consumer.h>
94d50d57	10	#include <linux/i2c.h>
a9fe713d SP	11	#include <linux/module.h>
a9fe713d SP	12	#include <linux/of.h>
191436c4	13	#include <drm/drm_atomic_helper.h>
ee68c743	14	#include <drm/drm_bridge.h>
191436c4	15	#include <drm/drm_crtc.h>
191436c4	16	#include <drm/drm_edid.h>
ebc94461	17	#include <drm/drm_of.h>
5bbb9a2e	18	#include <drm/drm_panel.h>
95b60804	19	#include <drm/drm_print.h>
fcd70cd3	20	#include <drm/drm_probe_helper.h>
a9fe713d SP	21
	22	#define PTN3460_EDID_ADDR 0x0
	23	#define PTN3460_EDID_EMULATION_ADDR 0x84
	24	#define PTN3460_EDID_ENABLE_EMULATION 0
	25	#define PTN3460_EDID_EMULATION_SELECTION 1
	26	#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
	27
	28	struct ptn3460_bridge {
	29	struct drm_connector connector;
	30	struct i2c_client *client;
94d50d57	31	struct drm_bridge bridge;
8f22c21d	32	struct drm_bridge *panel_bridge;
af478d88 AK	33	struct gpio_desc *gpio_pd_n;
af478d88 AK	34	struct gpio_desc *gpio_rst_n;
a9fe713d SP	35	u32 edid_emulation;
	36	bool enabled;
	37	};
	38
94d50d57 AK	39	static inline struct ptn3460_bridge *
	40	bridge_to_ptn3460(struct drm_bridge *bridge)
	41	{
	42	return container_of(bridge, struct ptn3460_bridge, bridge);
	43	}
	44
	45	static inline struct ptn3460_bridge *
	46	connector_to_ptn3460(struct drm_connector *connector)
	47	{
	48	return container_of(connector, struct ptn3460_bridge, connector);
	49	}
	50
a9fe713d SP	51	static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
	52	u8 *buf, int len)
	53	{
	54	int ret;
	55
	56	ret = i2c_master_send(ptn_bridge->client, &addr, 1);
	57	if (ret <= 0) {
	58	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	59	return ret;
	60	}
	61
	62	ret = i2c_master_recv(ptn_bridge->client, buf, len);
	63	if (ret <= 0) {
	64	DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
	65	return ret;
	66	}
	67
	68	return 0;
	69	}
	70
	71	static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
	72	char val)
	73	{
	74	int ret;
	75	char buf[2];
	76
	77	buf[0] = addr;
	78	buf[1] = val;
	79
	80	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
	81	if (ret <= 0) {
	82	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	83	return ret;
	84	}
	85
	86	return 0;
	87	}
	88
	89	static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
	90	{
	91	int ret;
	92	char val;
	93
	94	/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
	95	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
	96	ptn_bridge->edid_emulation);
	97	if (ret) {
94d50d57	98	DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
a9fe713d SP	99	return ret;
	100	}
	101
	102	/* Enable EDID emulation and select the desired EDID */
	103	val = 1 << PTN3460_EDID_ENABLE_EMULATION \|
	104	ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
	105
	106	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
	107	if (ret) {
94d50d57	108	DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
a9fe713d SP	109	return ret;
	110	}
	111
	112	return 0;
	113	}
	114
	115	static void ptn3460_pre_enable(struct drm_bridge *bridge)
	116	{
94d50d57	117	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	118	int ret;
	119
	120	if (ptn_bridge->enabled)
	121	return;
	122
af478d88	123	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
a9fe713d	124
af478d88 AK	125	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
	126	usleep_range(10, 20);
	127	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
a9fe713d SP	128
	129	/*
	130	* There's a bug in the PTN chip where it falsely asserts hotplug before
	131	* it is fully functional. We're forced to wait for the maximum start up
	132	* time specified in the chip's datasheet to make sure we're really up.
	133	*/
	134	msleep(90);
	135
	136	ret = ptn3460_select_edid(ptn_bridge);
	137	if (ret)
94d50d57	138	DRM_ERROR("Select EDID failed ret=%d\n", ret);
a9fe713d SP	139
	140	ptn_bridge->enabled = true;
	141	}
	142
a9fe713d SP	143	static void ptn3460_disable(struct drm_bridge *bridge)
a9fe713d SP	144	{
94d50d57	145	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	146
	147	if (!ptn_bridge->enabled)
	148	return;
	149
	150	ptn_bridge->enabled = false;
	151
af478d88 AK	152	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
af478d88 AK	153	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
a9fe713d SP	154	}
a9fe713d SP	155
a9fe713d	156
4151c14c SR	157	static struct edid ptn3460_get_edid(struct drm_bridge bridge,
4151c14c SR	158	struct drm_connector *connector)
a9fe713d	159	{
4151c14c	160	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d	161	bool power_off;
4151c14c SR	162	u8 *edid;
4151c14c SR	163	int ret;
a9fe713d SP	164
a9fe713d SP	165	power_off = !ptn_bridge->enabled;
94d50d57	166	ptn3460_pre_enable(&ptn_bridge->bridge);
a9fe713d SP	167
	168	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	169	if (!edid) {
94d50d57	170	DRM_ERROR("Failed to allocate EDID\n");
4151c14c	171	goto out;
a9fe713d SP	172	}
	173
	174	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
4151c14c	175	EDID_LENGTH);
a9fe713d SP	176	if (ret) {
a9fe713d SP	177	kfree(edid);
4151c14c	178	edid = NULL;
a9fe713d SP	179	goto out;
	180	}
	181
a9fe713d SP	182	out:
a9fe713d SP	183	if (power_off)
94d50d57	184	ptn3460_disable(&ptn_bridge->bridge);
a9fe713d	185
4151c14c SR	186	return (struct edid *)edid;
	187	}
	188
	189	static int ptn3460_connector_get_modes(struct drm_connector *connector)
	190	{
	191	struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
	192	struct edid *edid;
	193	int num_modes;
	194
	195	edid = ptn3460_get_edid(&ptn_bridge->bridge, connector);
	196	drm_connector_update_edid_property(connector, edid);
	197	num_modes = drm_add_edid_modes(connector, edid);
	198	kfree(edid);
	199
a9fe713d SP	200	return num_modes;
	201	}
	202
0aba67c1	203	static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
4151c14c	204	.get_modes = ptn3460_connector_get_modes,
a9fe713d SP	205	};
a9fe713d SP	206
0aba67c1	207	static const struct drm_connector_funcs ptn3460_connector_funcs = {
a9fe713d	208	.fill_modes = drm_helper_probe_single_connector_modes,
bf3b123e	209	.destroy = drm_connector_cleanup,
4ea9526b GP	210	.reset = drm_atomic_helper_connector_reset,
	211	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	212	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
a9fe713d SP	213	};
a9fe713d SP	214
a25b988f LP	215	static int ptn3460_bridge_attach(struct drm_bridge *bridge,
a25b988f LP	216	enum drm_bridge_attach_flags flags)
a9fe713d	217	{
6a1688ae	218	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d	219	int ret;
6a1688ae	220
8f22c21d SR	221	/* Let this driver create connector if requested */
	222	ret = drm_bridge_attach(bridge->encoder, ptn_bridge->panel_bridge,
	223	bridge, flags \| DRM_BRIDGE_ATTACH_NO_CONNECTOR);
	224	if (ret < 0)
	225	return ret;
	226
	227	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
	228	return 0;
a25b988f	229
6a1688ae AK	230	if (!bridge->encoder) {
	231	DRM_ERROR("Parent encoder object not found");
	232	return -ENODEV;
	233	}
	234
a1899953	235	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
6a1688ae AK	236	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
	237	&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	238	if (ret) {
	239	DRM_ERROR("Failed to initialize connector with drm\n");
	240	return ret;
	241	}
	242	drm_connector_helper_add(&ptn_bridge->connector,
	243	&ptn3460_connector_helper_funcs);
	244	drm_connector_register(&ptn_bridge->connector);
cde4c44d	245	drm_connector_attach_encoder(&ptn_bridge->connector,
6a1688ae AK	246	bridge->encoder);
6a1688ae AK	247
a1899953 AK	248	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
a1899953 AK	249
6a1688ae AK	250	return ret;
	251	}
	252
0aba67c1	253	static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
6a1688ae	254	.pre_enable = ptn3460_pre_enable,
6a1688ae	255	.disable = ptn3460_disable,
6a1688ae	256	.attach = ptn3460_bridge_attach,
4151c14c	257	.get_edid = ptn3460_get_edid,
6a1688ae AK	258	};
	259
	260	static int ptn3460_probe(struct i2c_client *client,
	261	const struct i2c_device_id *id)
	262	{
	263	struct device *dev = &client->dev;
a9fe713d	264	struct ptn3460_bridge *ptn_bridge;
8f22c21d SR	265	struct drm_bridge *panel_bridge;
8f22c21d SR	266	struct drm_panel *panel;
6a1688ae	267	int ret;
a9fe713d	268
6a1688ae	269	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
a9fe713d	270	if (!ptn_bridge) {
a9fe713d SP	271	return -ENOMEM;
	272	}
	273
8f22c21d	274	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, NULL);
ebc94461 RH	275	if (ret)
ebc94461 RH	276	return ret;
5bbb9a2e	277
8f22c21d SR	278	panel_bridge = devm_drm_panel_bridge_add(dev, panel);
	279	if (IS_ERR(panel_bridge))
	280	return PTR_ERR(panel_bridge);
	281
	282	ptn_bridge->panel_bridge = panel_bridge;
a9fe713d	283	ptn_bridge->client = client;
af478d88	284
c06ea0ad UKK	285	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
c06ea0ad UKK	286	GPIOD_OUT_HIGH);
af478d88 AK	287	if (IS_ERR(ptn_bridge->gpio_pd_n)) {
	288	ret = PTR_ERR(ptn_bridge->gpio_pd_n);
	289	dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
	290	return ret;
a9fe713d SP	291	}
a9fe713d SP	292
af478d88 AK	293	/*
	294	* Request the reset pin low to avoid the bridge being
	295	* initialized prematurely
	296	*/
c06ea0ad UKK	297	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
	298	GPIOD_OUT_LOW);
	299	if (IS_ERR(ptn_bridge->gpio_rst_n)) {
	300	ret = PTR_ERR(ptn_bridge->gpio_rst_n);
	301	DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
af478d88	302	return ret;
a9fe713d SP	303	}
a9fe713d SP	304
6a1688ae	305	ret = of_property_read_u32(dev->of_node, "edid-emulation",
a9fe713d SP	306	&ptn_bridge->edid_emulation);
a9fe713d SP	307	if (ret) {
6a1688ae	308	dev_err(dev, "Can't read EDID emulation value\n");
af478d88	309	return ret;
a9fe713d SP	310	}
a9fe713d SP	311
b07b90fd	312	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
4151c14c	313	ptn_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
8f22c21d	314	ptn_bridge->bridge.type = DRM_MODE_CONNECTOR_LVDS;
5bbb9a2e	315	ptn_bridge->bridge.of_node = dev->of_node;
830dcb44	316	drm_bridge_add(&ptn_bridge->bridge);
a9fe713d	317
6a1688ae	318	i2c_set_clientdata(client, ptn_bridge);
a9fe713d SP	319
a9fe713d SP	320	return 0;
a9fe713d	321	}
3d3f8b1f	322
6a1688ae	323	static int ptn3460_remove(struct i2c_client *client)
3d3f8b1f	324	{
6a1688ae AK	325	struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
	326
	327	drm_bridge_remove(&ptn_bridge->bridge);
3d3f8b1f	328
6a1688ae	329	return 0;
3d3f8b1f	330	}
6a1688ae AK	331
6a1688ae AK	332	static const struct i2c_device_id ptn3460_i2c_table[] = {
394e5b6d	333	{"ptn3460", 0},
6a1688ae AK	334	{},
	335	};
	336	MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
	337
	338	static const struct of_device_id ptn3460_match[] = {
	339	{ .compatible = "nxp,ptn3460" },
	340	{},
	341	};
	342	MODULE_DEVICE_TABLE(of, ptn3460_match);
	343
	344	static struct i2c_driver ptn3460_driver = {
	345	.id_table = ptn3460_i2c_table,
	346	.probe = ptn3460_probe,
	347	.remove = ptn3460_remove,
	348	.driver = {
	349	.name = "nxp,ptn3460",
6a1688ae AK	350	.of_match_table = ptn3460_match,
	351	},
	352	};
	353	module_i2c_driver(ptn3460_driver);
	354
	355	MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
	356	MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
	357	MODULE_LICENSE("GPL v2");