Unverified Commit 30e2ae94 authored by Adrien Grassein's avatar Adrien Grassein Committed by Robert Foss
Browse files

drm/bridge: Introduce LT8912B DSI to HDMI bridge 



Lontium LT8912B is a DSI to HDMI bridge.

Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarAdrien Grassein <adrien.grassein@gmail.com>
Reviewed-by: default avatarRobert Foss <robert.foss@linaro.org>
Signed-off-by: default avatarRobert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210326121955.1266230-3-adrien.grassein@gmail.com
parent 3aa6031d

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -10479,6 +10479,7 @@ LONTIUM LT8912B MIPI TO HDMI BRIDGE 
M:	Adrien Grassein <adrien.grassein@gmail.com>

S:	Maintained

F:	Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml

F:	drivers/gpu/drm/bridge/lontium-lt8912b.c









LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)









M:	Sathya Prakash <sathya.prakash@broadcom.com>
































drivers/gpu/drm/bridge/Kconfig



+14
−0






























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Diff line







@@ -61,6 +61,20 @@ config DRM_DISPLAY_CONNECTOR







	  on ARM-based platforms. Saying Y here when this driver is not needed









	  will not cause any issue.



















config DRM_LONTIUM_LT8912B









	tristate "Lontium LT8912B DSI/HDMI bridge"









	depends on OF









	select DRM_PANEL_BRIDGE









	select DRM_KMS_HELPER









	select REGMAP_I2C









	help









	  Driver for Lontium LT8912B DSI to HDMI bridge









	  chip driver.









	  Please say Y if you have such hardware.



















	  Say M here if you want to support this hardware as a module.









	  The module will be named "lontium-lt8912b".



















config DRM_LONTIUM_LT9611









	tristate "Lontium LT9611 DSI/HDMI bridge"









	select SND_SOC_HDMI_CODEC if SND_SOC
































drivers/gpu/drm/bridge/Makefile



+1
−0






























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Diff line







@@ -3,6 +3,7 @@ obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o







obj-$(CONFIG_DRM_CHIPONE_ICN6211) += chipone-icn6211.o









obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o









obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o









obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o









obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o









obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o









obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
































drivers/gpu/drm/bridge/lontium-lt8912b.c
0 → 100644



+765
−0






























Original line number
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Diff line









// SPDX-License-Identifier: GPL-2.0









/*









 * Copyright (c) 2018, The Linux Foundation. All rights reserved.









 */



















#include <linux/device.h>









#include <linux/delay.h>









#include <linux/i2c.h>









#include <linux/gpio.h>









#include <linux/of_gpio.h>









#include <linux/regmap.h>



















#include <drm/drm_probe_helper.h>









#include <drm/drm_atomic_helper.h>









#include <drm/drm_mipi_dsi.h>









#include <drm/drm_of.h>



















#include <video/videomode.h>



















#define I2C_MAIN 0









#define I2C_ADDR_MAIN 0x48



















#define I2C_CEC_DSI 1









#define I2C_ADDR_CEC_DSI 0x49



















#define I2C_MAX_IDX 2



















struct lt8912 {









	struct device *dev;









	struct drm_bridge bridge;









	struct drm_connector connector;



















	struct i2c_client *i2c_client[I2C_MAX_IDX];









	struct regmap *regmap[I2C_MAX_IDX];



















	struct device_node *host_node;









	struct drm_bridge *hdmi_port;



















	struct mipi_dsi_device *dsi;



















	struct gpio_desc *gp_reset;



















	struct videomode mode;



















	u8 data_lanes;









	bool is_power_on;









	bool is_attached;









};



















static int lt8912_write_init_config(struct lt8912 *lt)









{









	const struct reg_sequence seq[] = {









		/* Digital clock en*/









		{0x08, 0xff},









		{0x09, 0xff},









		{0x0a, 0xff},









		{0x0b, 0x7c},









		{0x0c, 0xff},









		{0x42, 0x04},



















		/*Tx Analog*/









		{0x31, 0xb1},









		{0x32, 0xb1},









		{0x33, 0x0e},









		{0x37, 0x00},









		{0x38, 0x22},









		{0x60, 0x82},



















		/*Cbus Analog*/









		{0x39, 0x45},









		{0x3a, 0x00},









		{0x3b, 0x00},



















		/*HDMI Pll Analog*/









		{0x44, 0x31},









		{0x55, 0x44},









		{0x57, 0x01},









		{0x5a, 0x02},



















		/*MIPI Analog*/









		{0x3e, 0xd6},









		{0x3f, 0xd4},









		{0x41, 0x3c},









		{0xB2, 0x00},









	};



















	return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));









}



















static int lt8912_write_mipi_basic_config(struct lt8912 *lt)









{









	const struct reg_sequence seq[] = {









		{0x12, 0x04},









		{0x14, 0x00},









		{0x15, 0x00},









		{0x1a, 0x03},









		{0x1b, 0x03},









	};



















	return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));









};



















static int lt8912_write_dds_config(struct lt8912 *lt)









{









	const struct reg_sequence seq[] = {









		{0x4e, 0xff},









		{0x4f, 0x56},









		{0x50, 0x69},









		{0x51, 0x80},









		{0x1f, 0x5e},









		{0x20, 0x01},









		{0x21, 0x2c},









		{0x22, 0x01},









		{0x23, 0xfa},









		{0x24, 0x00},









		{0x25, 0xc8},









		{0x26, 0x00},









		{0x27, 0x5e},









		{0x28, 0x01},









		{0x29, 0x2c},









		{0x2a, 0x01},









		{0x2b, 0xfa},









		{0x2c, 0x00},









		{0x2d, 0xc8},









		{0x2e, 0x00},









		{0x42, 0x64},









		{0x43, 0x00},









		{0x44, 0x04},









		{0x45, 0x00},









		{0x46, 0x59},









		{0x47, 0x00},









		{0x48, 0xf2},









		{0x49, 0x06},









		{0x4a, 0x00},









		{0x4b, 0x72},









		{0x4c, 0x45},









		{0x4d, 0x00},









		{0x52, 0x08},









		{0x53, 0x00},









		{0x54, 0xb2},









		{0x55, 0x00},









		{0x56, 0xe4},









		{0x57, 0x0d},









		{0x58, 0x00},









		{0x59, 0xe4},









		{0x5a, 0x8a},









		{0x5b, 0x00},









		{0x5c, 0x34},









		{0x1e, 0x4f},









		{0x51, 0x00},









	};



















	return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));









}



















static int lt8912_write_rxlogicres_config(struct lt8912 *lt)









{









	int ret;



















	ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);









	usleep_range(10000, 20000);









	ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff);



















	return ret;









};



















static int lt8912_write_lvds_config(struct lt8912 *lt)









{









	const struct reg_sequence seq[] = {









		{0x44, 0x30},









		{0x51, 0x05},









		{0x50, 0x24},









		{0x51, 0x2d},









		{0x52, 0x04},









		{0x69, 0x0e},









		{0x69, 0x8e},









		{0x6a, 0x00},









		{0x6c, 0xb8},









		{0x6b, 0x51},









		{0x04, 0xfb},









		{0x04, 0xff},









		{0x7f, 0x00},









		{0xa8, 0x13},









		{0x02, 0xf7},









		{0x02, 0xff},









		{0x03, 0xcf},









		{0x03, 0xff},









	};



















	return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));









};



















static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)









{









	return container_of(b, struct lt8912, bridge);









}



















static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)









{









	return container_of(c, struct lt8912, connector);









}



















static const struct regmap_config lt8912_regmap_config = {









	.reg_bits = 8,









	.val_bits = 8,









	.max_register = 0xff,









};



















static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client)









{









	unsigned int i;









	/*









	 * At this time we only initialize 2 chips, but the lt8912 provides









	 * a third interface for the audio over HDMI configuration.









	 */









	struct i2c_board_info info[] = {









		{ I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },









		{ I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },









	};



















	if (!lt)









		return -ENODEV;



















	for (i = 0; i < ARRAY_SIZE(info); i++) {









		if (i > 0) {









			lt->i2c_client[i] = i2c_new_dummy_device(client->adapter,









								 info[i].addr);









			if (IS_ERR(lt->i2c_client[i]))









				return PTR_ERR(lt->i2c_client[i]);









		}



















		lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],









						     &lt8912_regmap_config);









		if (IS_ERR(lt->regmap[i]))









			return PTR_ERR(lt->regmap[i]);









	}









	return 0;









}



















static int lt8912_free_i2c(struct lt8912 *lt)









{









	unsigned int i;



















	for (i = 1; i < I2C_MAX_IDX; i++)









		i2c_unregister_device(lt->i2c_client[i]);



















	return 0;









}



















static int lt8912_hard_power_on(struct lt8912 *lt)









{









	gpiod_set_value_cansleep(lt->gp_reset, 0);









	msleep(20);



















	return 0;









}



















static void lt8912_hard_power_off(struct lt8912 *lt)









{









	gpiod_set_value_cansleep(lt->gp_reset, 1);









	msleep(20);









	lt->is_power_on = false;









}



















static int lt8912_video_setup(struct lt8912 *lt)









{









	u32 hactive, h_total, hpw, hfp, hbp;









	u32 vactive, v_total, vpw, vfp, vbp;









	u8 settle = 0x08;









	int ret;



















	if (!lt)









		return -EINVAL;



















	hactive = lt->mode.hactive;









	hfp = lt->mode.hfront_porch;









	hpw = lt->mode.hsync_len;









	hbp = lt->mode.hback_porch;









	h_total = hactive + hfp + hpw + hbp;



















	vactive = lt->mode.vactive;









	vfp = lt->mode.vfront_porch;









	vpw = lt->mode.vsync_len;









	vbp = lt->mode.vback_porch;









	v_total = vactive + vfp + vpw + vbp;



















	if (vactive <= 600)









		settle = 0x04;









	else if (vactive == 1080)









		settle = 0x0a;



















	ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8);



















	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);



















	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8);



















	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8);



















	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8);



















	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8);



















	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8);



















	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);









	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);



















	return ret;









}



















static int lt8912_soft_power_on(struct lt8912 *lt)









{









	if (!lt->is_power_on) {









		u32 lanes = lt->data_lanes;



















		lt8912_write_init_config(lt);









		regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3);



















		lt8912_write_mipi_basic_config(lt);



















		lt->is_power_on = true;









	}



















	return 0;









}



















static int lt8912_video_on(struct lt8912 *lt)









{









	int ret;



















	ret = lt8912_video_setup(lt);









	if (ret < 0)









		goto end;



















	ret = lt8912_write_dds_config(lt);









	if (ret < 0)









		goto end;



















	ret = lt8912_write_rxlogicres_config(lt);









	if (ret < 0)









		goto end;



















	ret = lt8912_write_lvds_config(lt);









	if (ret < 0)









		goto end;



















end:









	return ret;









}



















static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt)









{









	int ret;









	unsigned int reg_val;



















	ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, &reg_val);









	if (ret)









		return connector_status_unknown;



















	if (reg_val & BIT(7))









		return connector_status_connected;



















	return connector_status_disconnected;









}



















static enum drm_connector_status









lt8912_connector_detect(struct drm_connector *connector, bool force)









{









	struct lt8912 *lt = connector_to_lt8912(connector);



















	if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)









		return drm_bridge_detect(lt->hdmi_port);



















	return lt8912_check_cable_status(lt);









}



















static const struct drm_connector_funcs lt8912_connector_funcs = {









	.detect = lt8912_connector_detect,









	.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 enum drm_mode_status









lt8912_connector_mode_valid(struct drm_connector *connector,









			    struct drm_display_mode *mode)









{









	if (mode->clock > 150000)









		return MODE_CLOCK_HIGH;



















	if (mode->hdisplay > 1920)









		return MODE_BAD_HVALUE;



















	if (mode->vdisplay > 1080)









		return MODE_BAD_VVALUE;



















	return MODE_OK;









}



















static int lt8912_connector_get_modes(struct drm_connector *connector)









{









	struct edid *edid;









	int ret = -1;









	int num = 0;









	struct lt8912 *lt = connector_to_lt8912(connector);









	u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;



















	edid = drm_bridge_get_edid(lt->hdmi_port, connector);









	if (edid) {









		drm_connector_update_edid_property(connector, edid);









		num = drm_add_edid_modes(connector, edid);









	} else {









		return ret;









	}



















	ret = drm_display_info_set_bus_formats(&connector->display_info,









					       &bus_format, 1);









	if (ret)









		num = ret;



















	kfree(edid);









	return num;









}



















static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {









	.get_modes = lt8912_connector_get_modes,









	.mode_valid = lt8912_connector_mode_valid,









};



















static void lt8912_bridge_mode_set(struct drm_bridge *bridge,









				   const struct drm_display_mode *mode,









				   const struct drm_display_mode *adj)









{









	struct lt8912 *lt = bridge_to_lt8912(bridge);



















	drm_display_mode_to_videomode(adj, &lt->mode);









}



















static void lt8912_bridge_enable(struct drm_bridge *bridge)









{









	struct lt8912 *lt = bridge_to_lt8912(bridge);



















	lt8912_video_on(lt);









}



















static int lt8912_attach_dsi(struct lt8912 *lt)









{









	struct device *dev = lt->dev;









	struct mipi_dsi_host *host;









	struct mipi_dsi_device *dsi;









	int ret = -1;









	const struct mipi_dsi_device_info info = { .type = "lt8912",









						   .channel = 0,









						   .node = NULL,









						 };



















	host = of_find_mipi_dsi_host_by_node(lt->host_node);









	if (!host) {









		dev_err(dev, "failed to find dsi host\n");









		return -EPROBE_DEFER;









	}



















	dsi = mipi_dsi_device_register_full(host, &info);









	if (IS_ERR(dsi)) {









		ret = PTR_ERR(dsi);









		dev_err(dev, "failed to create dsi device (%d)\n", ret);









		goto err_dsi_device;









	}



















	lt->dsi = dsi;



















	dsi->lanes = lt->data_lanes;









	dsi->format = MIPI_DSI_FMT_RGB888;



















	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |









			  MIPI_DSI_MODE_VIDEO_BURST |









			  MIPI_DSI_MODE_LPM |









			  MIPI_DSI_MODE_EOT_PACKET;



















	ret = mipi_dsi_attach(dsi);









	if (ret < 0) {









		dev_err(dev, "failed to attach dsi to host\n");









		goto err_dsi_attach;









	}



















	return 0;



















err_dsi_attach:









	mipi_dsi_device_unregister(dsi);









err_dsi_device:









	return ret;









}



















static void lt8912_detach_dsi(struct lt8912 *lt)









{









	mipi_dsi_detach(lt->dsi);









	mipi_dsi_device_unregister(lt->dsi);









}



















static int lt8912_bridge_connector_init(struct drm_bridge *bridge)









{









	int ret;









	struct lt8912 *lt = bridge_to_lt8912(bridge);









	struct drm_connector *connector = &lt->connector;



















	connector->polled = DRM_CONNECTOR_POLL_CONNECT |









			    DRM_CONNECTOR_POLL_DISCONNECT;



















	ret = drm_connector_init(bridge->dev, connector,









				 &lt8912_connector_funcs,









				 lt->hdmi_port->type);









	if (ret)









		goto exit;



















	drm_connector_helper_add(connector, &lt8912_connector_helper_funcs);



















	connector->dpms = DRM_MODE_DPMS_OFF;









	drm_connector_attach_encoder(connector, bridge->encoder);



















exit:









	return ret;









}



















static int lt8912_bridge_attach(struct drm_bridge *bridge,









				enum drm_bridge_attach_flags flags)









{









	struct lt8912 *lt = bridge_to_lt8912(bridge);









	int ret;



















	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {









		ret = lt8912_bridge_connector_init(bridge);









		if (ret) {









			dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);









			return ret;









		}









	}



















	ret = lt8912_hard_power_on(lt);









	if (ret)









		return ret;



















	ret = lt8912_soft_power_on(lt);









	if (ret)









		goto error;



















	ret = lt8912_attach_dsi(lt);









	if (ret)









		goto error;



















	lt->is_attached = true;



















	return 0;



















error:









	lt8912_hard_power_off(lt);









	return ret;









}



















static void lt8912_bridge_detach(struct drm_bridge *bridge)









{









	struct lt8912 *lt = bridge_to_lt8912(bridge);



















	if (lt->is_attached) {









		lt8912_detach_dsi(lt);









		lt8912_hard_power_off(lt);









		drm_connector_unregister(&lt->connector);









		drm_connector_cleanup(&lt->connector);









	}









}



















static enum drm_connector_status









lt8912_bridge_detect(struct drm_bridge *bridge)









{









	struct lt8912 *lt = bridge_to_lt8912(bridge);



















	if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)









		return drm_bridge_detect(lt->hdmi_port);



















	return lt8912_check_cable_status(lt);









}



















static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge,









					   struct drm_connector *connector)









{









	struct lt8912 *lt = bridge_to_lt8912(bridge);



















	/*









	 * edid must be read through the ddc bus but it must be









	 * given to the hdmi connector node.









	 */









	if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)









		return drm_bridge_get_edid(lt->hdmi_port, connector);



















	dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");









	return NULL;









}



















static const struct drm_bridge_funcs lt8912_bridge_funcs = {









	.attach = lt8912_bridge_attach,









	.detach = lt8912_bridge_detach,









	.mode_set = lt8912_bridge_mode_set,









	.enable = lt8912_bridge_enable,









	.detect = lt8912_bridge_detect,









	.get_edid = lt8912_bridge_get_edid,









};



















static int lt8912_parse_dt(struct lt8912 *lt)









{









	struct gpio_desc *gp_reset;









	struct device *dev = lt->dev;









	int ret = 0;









	struct device_node *port_node;









	struct device_node *endpoint;



















	gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);









	if (IS_ERR(gp_reset)) {









		ret = PTR_ERR(gp_reset);









		if (ret != -EPROBE_DEFER)









			dev_err(dev, "Failed to get reset gpio: %d\n", ret);









		return ret;









	}









	lt->gp_reset = gp_reset;



















	endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);









	if (IS_ERR(endpoint)) {









		ret = PTR_ERR(endpoint);









		goto end;









	}



















	lt->data_lanes = of_property_count_u32_elems(endpoint, "data-lanes");









	of_node_put(endpoint);



















	lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);









	if (!lt->host_node) {









		dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);









		ret = -ENODEV;









		goto end;









	}



















	port_node = of_graph_get_remote_node(dev->of_node, 1, -1);









	if (!port_node) {









		dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);









		ret = -ENODEV;









		goto err_free_host_node;









	}



















	lt->hdmi_port = of_drm_find_bridge(port_node);









	if (IS_ERR(lt->hdmi_port)) {









		dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);









		ret = PTR_ERR(lt->hdmi_port);









		of_node_put(lt->host_node);









		goto end;









	}



















	if (!of_device_is_compatible(port_node, "hdmi-connector")) {









		dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);









		ret = -EINVAL;









	}



















	of_node_put(port_node);



















end:









	return ret;



















err_free_host_node:









	of_node_put(lt->host_node);









	return ret;









}



















static int lt8912_put_dt(struct lt8912 *lt)









{









	of_node_put(lt->host_node);









	return 0;









}



















static int lt8912_probe(struct i2c_client *client,









			const struct i2c_device_id *id)









{









	static struct lt8912 *lt;









	int ret = 0;









	struct device *dev = &client->dev;



















	lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);









	if (!lt)









		return -ENOMEM;



















	lt->dev = dev;









	lt->i2c_client[0] = client;



















	ret = lt8912_parse_dt(lt);









	if (ret)









		goto err_dt_parse;



















	ret = lt8912_init_i2c(lt, client);









	if (ret)









		goto err_i2c;



















	i2c_set_clientdata(client, lt);



















	lt->bridge.funcs = &lt8912_bridge_funcs;









	lt->bridge.of_node = dev->of_node;









	lt->bridge.ops = (DRM_BRIDGE_OP_EDID |









			  DRM_BRIDGE_OP_DETECT);



















	drm_bridge_add(&lt->bridge);



















	return 0;



















err_i2c:









	lt8912_put_dt(lt);









err_dt_parse:









	return ret;









}



















static int lt8912_remove(struct i2c_client *client)









{









	struct lt8912 *lt = i2c_get_clientdata(client);



















	lt8912_bridge_detach(&lt->bridge);









	drm_bridge_remove(&lt->bridge);









	lt8912_free_i2c(lt);









	lt8912_put_dt(lt);









	return 0;









}



















static const struct of_device_id lt8912_dt_match[] = {









	{.compatible = "lontium,lt8912b"},









	{}









};









MODULE_DEVICE_TABLE(of, lt8912_dt_match);



















static const struct i2c_device_id lt8912_id[] = {









	{"lt8912", 0},









	{},









};









MODULE_DEVICE_TABLE(i2c, lt8912_id);



















static struct i2c_driver lt8912_i2c_driver = {









	.driver = {









		.name = "lt8912",









		.of_match_table = lt8912_dt_match,









		.owner = THIS_MODULE,









	},









	.probe = lt8912_probe,









	.remove = lt8912_remove,









	.id_table = lt8912_id,









};









module_i2c_driver(lt8912_i2c_driver);



















MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");









MODULE_DESCRIPTION("lt8912 drm driver");









MODULE_LICENSE("GPL v2");