[v3,2/2] drm: bridge: add support for lontium LT9611UXC bridge

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 3e11af4e9f63..8343fb054652 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -61,6 +61,19 @@  config DRM_LONTIUM_LT9611
 	  HDMI signals
 	  Please say Y if you have such hardware.
 
+config DRM_LONTIUM_LT9611UXC
+	tristate "Lontium LT9611UXC DSI/HDMI bridge"
+	select SND_SOC_HDMI_CODEC if SND_SOC
+	depends on OF
+	select DRM_PANEL_BRIDGE
+	select DRM_KMS_HELPER
+	select REGMAP_I2C
+	help
+	  Driver for Lontium LT9611UXC DSI to HDMI bridge
+	  chip driver that converts dual DSI and I2S to
+	  HDMI signals
+	  Please say Y if you have such hardware.
+
 config DRM_LVDS_CODEC
 	tristate "Transparent LVDS encoders and decoders support"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index c589a6a7cbe1..306850a5899b 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -3,6 +3,7 @@  obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
 obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
 obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
 obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
+obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o
 obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
 obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
new file mode 100644
index 000000000000..4d0ebda2b9f7
--- /dev/null
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -0,0 +1,788 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019-2020. Linaro Limited.
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <sound/hdmi-codec.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#define EDID_BLOCK_SIZE	128
+#define EDID_NUM_BLOCKS	2
+
+struct lt9611uxc {
+	struct device *dev;
+	struct drm_bridge bridge;
+	struct drm_connector connector;
+
+	struct regmap *regmap;
+	/* Protects all accesses to registers by stopping the on-chip MCU */
+	struct mutex ocm_lock;
+
+	struct device_node *dsi0_node;
+	struct device_node *dsi1_node;
+	struct mipi_dsi_device *dsi0;
+	struct mipi_dsi_device *dsi1;
+	struct platform_device *audio_pdev;
+
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *enable_gpio;
+
+	struct regulator_bulk_data supplies[2];
+
+	struct i2c_client *client;
+
+	bool hpd_supported;
+	u8 edid_buf[EDID_BLOCK_SIZE * EDID_NUM_BLOCKS];
+};
+
+#define LT9611_PAGE_CONTROL	0xff
+
+static const struct regmap_range_cfg lt9611uxc_ranges[] = {
+	{
+		.name = "register_range",
+		.range_min =  0,
+		.range_max = 0xd0ff,
+		.selector_reg = LT9611_PAGE_CONTROL,
+		.selector_mask = 0xff,
+		.selector_shift = 0,
+		.window_start = 0,
+		.window_len = 0x100,
+	},
+};
+
+static const struct regmap_config lt9611uxc_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xffff,
+	.ranges = lt9611uxc_ranges,
+	.num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
+};
+
+struct lt9611uxc_mode {
+	u16 hdisplay;
+	u16 vdisplay;
+	u8 vrefresh;
+	u8 lanes;
+	u8 intfs;
+};
+
+/*
+ * This chip supports only a fixed set of modes.
+ * Enumerate them here to check whether the mode is supported.
+ */
+static struct lt9611uxc_mode lt9611uxc_modes[] = {
+	{ 3840, 2160, 60, 4, 2 }, /* 3840x2160 24bit 60Hz 4Lane 2ports */
+	{ 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
+	{ 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
+	{ 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
+	{ 1920, 1080, 24, 3, 1 },
+	{ 1024, 768, 60, 4, 1},
+	{ 800, 600, 60, 4, 1},
+	{ 720, 480, 60, 4, 1 },
+	{ 720, 576, 50, 2, 1 },
+	{ 640, 480, 60, 2, 1 },
+};
+
+static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct lt9611uxc, bridge);
+}
+
+static struct lt9611uxc *connector_to_lt9611uxc(struct drm_connector *connector)
+{
+	return container_of(connector, struct lt9611uxc, connector);
+}
+
+static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
+{
+	mutex_lock(&lt9611uxc->ocm_lock);
+	regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
+}
+
+static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
+{
+	regmap_write(lt9611uxc->regmap, 0x80ee, 0x00);
+	msleep(50);
+	mutex_unlock(&lt9611uxc->ocm_lock);
+}
+
+static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
+{
+	struct lt9611uxc *lt9611uxc = dev_id;
+	unsigned int irq_status = 0;
+
+	lt9611uxc_lock(lt9611uxc);
+
+	regmap_read(lt9611uxc->regmap, 0xb022, &irq_status);
+	if (irq_status)
+		regmap_write(lt9611uxc->regmap, 0xb022, 0);
+
+	lt9611uxc_unlock(lt9611uxc);
+
+	if (irq_status & 0x3 && lt9611uxc->bridge.dev)
+		drm_kms_helper_hotplug_event(lt9611uxc->bridge.dev);
+
+	return IRQ_HANDLED;
+}
+
+static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
+{
+	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
+	msleep(20);
+
+	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 0);
+	msleep(20);
+
+	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
+	msleep(180);
+}
+
+static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
+{
+	if (!lt9611uxc->enable_gpio)
+		return;
+
+	gpiod_set_value_cansleep(lt9611uxc->enable_gpio, 1);
+	msleep(20);
+}
+
+static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
+{
+	int ret;
+
+	lt9611uxc->supplies[0].supply = "vdd";
+	lt9611uxc->supplies[1].supply = "vcc";
+
+	ret = devm_regulator_bulk_get(lt9611uxc->dev, 2, lt9611uxc->supplies);
+	if (ret < 0)
+		return ret;
+
+	return regulator_set_load(lt9611uxc->supplies[0].consumer, 200000);
+}
+
+static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
+{
+	int ret;
+
+	ret = regulator_enable(lt9611uxc->supplies[0].consumer);
+	if (ret < 0)
+		return ret;
+
+	usleep_range(1000, 10000); /* 50000 according to dtsi */
+
+	ret = regulator_enable(lt9611uxc->supplies[1].consumer);
+	if (ret < 0) {
+		regulator_disable(lt9611uxc->supplies[0].consumer);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
+		if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
+		    lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
+		    lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
+			return &lt9611uxc_modes[i];
+		}
+	}
+
+	return NULL;
+}
+
+static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
+						    struct device_node *dsi_node)
+{
+	const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
+	struct mipi_dsi_device *dsi;
+	struct mipi_dsi_host *host;
+	int ret;
+
+	host = of_find_mipi_dsi_host_by_node(dsi_node);
+	if (!host) {
+		dev_err(lt9611uxc->dev, "failed to find dsi host\n");
+		return ERR_PTR(-EPROBE_DEFER);
+	}
+
+	dsi = mipi_dsi_device_register_full(host, &info);
+	if (IS_ERR(dsi)) {
+		dev_err(lt9611uxc->dev, "failed to create dsi device\n");
+		return dsi;
+	}
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+			  MIPI_DSI_MODE_VIDEO_HSE;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(lt9611uxc->dev, "failed to attach dsi to host\n");
+		mipi_dsi_device_unregister(dsi);
+		return ERR_PTR(ret);
+	}
+
+	return dsi;
+}
+
+static int lt9611uxc_connector_get_modes(struct drm_connector *connector)
+{
+	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
+	unsigned int count;
+	struct edid *edid;
+
+	edid = lt9611uxc->bridge.funcs->get_edid(&lt9611uxc->bridge, connector);
+	drm_connector_update_edid_property(connector, edid);
+	count = drm_add_edid_modes(connector, edid);
+	kfree(edid);
+
+	return count;
+}
+
+static enum drm_connector_status lt9611uxc_connector_detect(struct drm_connector *connector,
+							    bool force)
+{
+	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
+
+	return lt9611uxc->bridge.funcs->detect(&lt9611uxc->bridge);
+}
+
+static enum drm_mode_status lt9611uxc_connector_mode_valid(struct drm_connector *connector,
+							   struct drm_display_mode *mode)
+{
+	struct lt9611uxc_mode *lt9611uxc_mode = lt9611uxc_find_mode(mode);
+
+	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
+}
+
+static const struct drm_connector_helper_funcs lt9611uxc_bridge_connector_helper_funcs = {
+	.get_modes = lt9611uxc_connector_get_modes,
+	.mode_valid = lt9611uxc_connector_mode_valid,
+};
+
+static const struct drm_connector_funcs lt9611uxc_bridge_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = lt9611uxc_connector_detect,
+	.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 lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc *lt9611uxc)
+{
+	int ret;
+
+	if (!bridge->encoder) {
+		DRM_ERROR("Parent encoder object not found");
+		return -ENODEV;
+	}
+
+	drm_connector_helper_add(&lt9611uxc->connector,
+				 &lt9611uxc_bridge_connector_helper_funcs);
+	ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
+				 &lt9611uxc_bridge_connector_funcs,
+				 DRM_MODE_CONNECTOR_HDMIA);
+	if (ret) {
+		DRM_ERROR("Failed to initialize connector with drm\n");
+		return ret;
+	}
+
+	return drm_connector_attach_encoder(&lt9611uxc->connector, bridge->encoder);
+}
+
+static void lt9611uxc_bridge_detach(struct drm_bridge *bridge)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+
+	if (lt9611uxc->dsi1) {
+		mipi_dsi_detach(lt9611uxc->dsi1);
+		mipi_dsi_device_unregister(lt9611uxc->dsi1);
+	}
+
+	mipi_dsi_detach(lt9611uxc->dsi0);
+	mipi_dsi_device_unregister(lt9611uxc->dsi0);
+}
+
+static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
+				   enum drm_bridge_attach_flags flags)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+	int ret;
+
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		ret = lt9611uxc_connector_init(bridge, lt9611uxc);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Attach primary DSI */
+	lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
+	if (IS_ERR(lt9611uxc->dsi0))
+		return PTR_ERR(lt9611uxc->dsi0);
+
+	/* Attach secondary DSI, if specified */
+	if (lt9611uxc->dsi1_node) {
+		lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
+		if (IS_ERR(lt9611uxc->dsi1)) {
+			ret = PTR_ERR(lt9611uxc->dsi1);
+			goto err_unregister_dsi0;
+		}
+	}
+
+	return 0;
+
+err_unregister_dsi0:
+	mipi_dsi_detach(lt9611uxc->dsi0);
+	mipi_dsi_device_unregister(lt9611uxc->dsi0);
+
+	return ret;
+}
+
+static enum drm_mode_status
+lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
+			    const struct drm_display_info *info,
+			    const struct drm_display_mode *mode)
+{
+	struct lt9611uxc_mode *lt9611uxc_mode;
+
+	lt9611uxc_mode = lt9611uxc_find_mode(mode);
+
+	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
+}
+
+static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
+				  const struct drm_display_mode *mode)
+{
+	u32 h_total, hactive, hsync_len, hfront_porch;
+	u32 v_total, vactive, vsync_len, vfront_porch;
+
+	h_total = mode->htotal;
+	v_total = mode->vtotal;
+
+	hactive = mode->hdisplay;
+	hsync_len = mode->hsync_end - mode->hsync_start;
+	hfront_porch = mode->hsync_start - mode->hdisplay;
+
+	vactive = mode->vdisplay;
+	vsync_len = mode->vsync_end - mode->vsync_start;
+	vfront_porch = mode->vsync_start - mode->vdisplay;
+
+	regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
+	regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
+	regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
+	regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
+	regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
+
+	regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
+	regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
+
+	regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
+	regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
+
+	regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
+	regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
+}
+
+static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
+				      const struct drm_display_mode *mode,
+				      const struct drm_display_mode *adj_mode)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+
+	lt9611uxc_lock(lt9611uxc);
+	lt9611uxc_video_setup(lt9611uxc, mode);
+	lt9611uxc_unlock(lt9611uxc);
+}
+
+static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+	unsigned int reg_val = 0;
+	int ret;
+	int connected = 1;
+
+	if (lt9611uxc->hpd_supported) {
+		lt9611uxc_lock(lt9611uxc);
+		ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
+		lt9611uxc_unlock(lt9611uxc);
+
+		if (ret)
+			dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
+		else
+			connected  = reg_val & BIT(1);
+	}
+
+	return connected ?  connector_status_connected :
+				connector_status_disconnected;
+}
+
+static int lt9611uxc_read_edid(struct lt9611uxc *lt9611uxc)
+{
+	int ret = 0;
+	int i;
+
+	/* memset to clear old buffer, if any */
+	memset(lt9611uxc->edid_buf, 0, sizeof(lt9611uxc->edid_buf));
+
+	lt9611uxc_lock(lt9611uxc);
+
+	regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
+
+#define EDID_SEG 16
+	for (i = 0; i < 2 * EDID_BLOCK_SIZE; i += EDID_SEG) {
+		regmap_write(lt9611uxc->regmap, 0xb00a, i);
+		ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0,
+					&lt9611uxc->edid_buf[i], EDID_SEG);
+		if (ret < 0)
+			break;
+	}
+
+	lt9611uxc_unlock(lt9611uxc);
+	return ret;
+}
+
+static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
+{
+	struct lt9611uxc *lt9611uxc = data;
+	int ret;
+
+	if (len > EDID_BLOCK_SIZE)
+		return -EINVAL;
+
+	if (block >= EDID_NUM_BLOCKS)
+		return -EINVAL;
+
+	if (block == 0) {
+		ret = lt9611uxc_read_edid(lt9611uxc);
+		if (ret) {
+			dev_err(lt9611uxc->dev, "edid read failed\n");
+			return ret;
+		}
+	}
+
+	memcpy(buf, lt9611uxc->edid_buf + block * EDID_BLOCK_SIZE, len);
+	return 0;
+};
+
+static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
+					      struct drm_connector *connector)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+
+	return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
+}
+
+static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
+	.attach = lt9611uxc_bridge_attach,
+	.detach = lt9611uxc_bridge_detach,
+	.mode_valid = lt9611uxc_bridge_mode_valid,
+	.mode_set = lt9611uxc_bridge_mode_set,
+	.detect = lt9611uxc_bridge_detect,
+	.get_edid = lt9611uxc_bridge_get_edid,
+};
+
+static int lt9611uxc_parse_dt(struct device *dev,
+			      struct lt9611uxc *lt9611uxc)
+{
+	lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
+	if (!lt9611uxc->dsi0_node) {
+		dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
+		return -ENODEV;
+	}
+
+	lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
+
+	return 0;
+}
+
+static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
+{
+	struct device *dev = lt9611uxc->dev;
+
+	lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(lt9611uxc->reset_gpio)) {
+		dev_err(dev, "failed to acquire reset gpio\n");
+		return PTR_ERR(lt9611uxc->reset_gpio);
+	}
+
+	lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(lt9611uxc->enable_gpio)) {
+		dev_err(dev, "failed to acquire enable gpio\n");
+		return PTR_ERR(lt9611uxc->enable_gpio);
+	}
+
+	return 0;
+}
+
+static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
+{
+	unsigned int rev0, rev1, rev2;
+	int ret;
+
+	lt9611uxc_lock(lt9611uxc);
+
+	ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
+	ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
+	ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
+	if (ret)
+		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
+	else
+		dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
+
+	lt9611uxc_unlock(lt9611uxc);
+
+	return ret;
+}
+
+static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
+{
+	unsigned int rev;
+	int ret;
+
+	lt9611uxc_lock(lt9611uxc);
+
+	ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
+	if (ret)
+		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
+	else
+		dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
+
+	lt9611uxc_unlock(lt9611uxc);
+
+	return ret < 0 ? ret : rev;
+}
+
+static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
+				    struct hdmi_codec_daifmt *fmt,
+				    struct hdmi_codec_params *hparms)
+{
+	/*
+	 * LT9611UXC will automatically detect rate and sample size, so no need
+	 * to setup anything here.
+	 */
+	return 0;
+}
+
+static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
+{
+}
+
+static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
+					 struct device_node *endpoint)
+{
+	struct of_endpoint of_ep;
+	int ret;
+
+	ret = of_graph_parse_endpoint(endpoint, &of_ep);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * HDMI sound should be located as reg = <2>
+	 * Then, it is sound port 0
+	 */
+	if (of_ep.port == 2)
+		return 0;
+
+	return -EINVAL;
+}
+
+static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
+	.hw_params	= lt9611uxc_hdmi_hw_params,
+	.audio_shutdown = lt9611uxc_audio_shutdown,
+	.get_dai_id	= lt9611uxc_hdmi_i2s_get_dai_id,
+};
+
+static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
+{
+	struct hdmi_codec_pdata codec_data = {
+		.ops = &lt9611uxc_codec_ops,
+		.max_i2s_channels = 2,
+		.i2s = 1,
+		.data = lt9611uxc,
+	};
+
+	lt9611uxc->audio_pdev =
+		platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
+					      PLATFORM_DEVID_AUTO,
+					      &codec_data, sizeof(codec_data));
+
+	return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
+}
+
+static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
+{
+	if (lt9611uxc->audio_pdev) {
+		platform_device_unregister(lt9611uxc->audio_pdev);
+		lt9611uxc->audio_pdev = NULL;
+	}
+}
+
+static int lt9611uxc_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	struct lt9611uxc *lt9611uxc;
+	struct device *dev = &client->dev;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(dev, "device doesn't support I2C\n");
+		return -ENODEV;
+	}
+
+	lt9611uxc = devm_kzalloc(dev, sizeof(*lt9611uxc), GFP_KERNEL);
+	if (!lt9611uxc)
+		return -ENOMEM;
+
+	lt9611uxc->dev = &client->dev;
+	lt9611uxc->client = client;
+	mutex_init(&lt9611uxc->ocm_lock);
+
+	lt9611uxc->regmap = devm_regmap_init_i2c(client, &lt9611uxc_regmap_config);
+	if (IS_ERR(lt9611uxc->regmap)) {
+		dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
+		return PTR_ERR(lt9611uxc->regmap);
+	}
+
+	ret = lt9611uxc_parse_dt(&client->dev, lt9611uxc);
+	if (ret) {
+		dev_err(dev, "failed to parse device tree\n");
+		return ret;
+	}
+
+	ret = lt9611uxc_gpio_init(lt9611uxc);
+	if (ret < 0)
+		goto err_of_put;
+
+	ret = lt9611uxc_regulator_init(lt9611uxc);
+	if (ret < 0)
+		goto err_of_put;
+
+	lt9611uxc_assert_5v(lt9611uxc);
+
+	ret = lt9611uxc_regulator_enable(lt9611uxc);
+	if (ret)
+		goto err_of_put;
+
+	lt9611uxc_reset(lt9611uxc);
+
+	ret = lt9611uxc_read_device_rev(lt9611uxc);
+	if (ret) {
+		dev_err(dev, "failed to read chip rev\n");
+		goto err_disable_regulators;
+	}
+
+	ret = lt9611uxc_read_version(lt9611uxc);
+	if (ret < 0) {
+		dev_err(dev, "failed to read FW version\n");
+		goto err_disable_regulators;
+	} else if (ret == 0) {
+		dev_err(dev, "FW version 0, FW update not supported\n");
+		ret = -EOPNOTSUPP;
+		goto err_disable_regulators;
+	} else if (ret < 0x40) {
+		dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
+	} else {
+		lt9611uxc->hpd_supported = true;
+	}
+
+	ret = devm_request_threaded_irq(dev, client->irq, NULL,
+					lt9611uxc_irq_thread_handler,
+					IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
+	if (ret) {
+		dev_err(dev, "failed to request irq\n");
+		goto err_disable_regulators;
+	}
+
+	i2c_set_clientdata(client, lt9611uxc);
+
+	lt9611uxc->bridge.funcs = &lt9611uxc_bridge_funcs;
+	lt9611uxc->bridge.of_node = client->dev.of_node;
+	lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
+	if (lt9611uxc->hpd_supported)
+		lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
+	lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
+
+	drm_bridge_add(&lt9611uxc->bridge);
+
+	return lt9611uxc_audio_init(dev, lt9611uxc);
+
+err_disable_regulators:
+	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
+
+err_of_put:
+	of_node_put(lt9611uxc->dsi1_node);
+	of_node_put(lt9611uxc->dsi0_node);
+
+	return ret;
+}
+
+static int lt9611uxc_remove(struct i2c_client *client)
+{
+	struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
+
+	disable_irq(client->irq);
+	lt9611uxc_audio_exit(lt9611uxc);
+	drm_bridge_remove(&lt9611uxc->bridge);
+
+	mutex_destroy(&lt9611uxc->ocm_lock);
+
+	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
+
+	of_node_put(lt9611uxc->dsi1_node);
+	of_node_put(lt9611uxc->dsi0_node);
+
+	return 0;
+}
+
+static struct i2c_device_id lt9611uxc_id[] = {
+	{ "lontium,lt9611uxc", 0 },
+	{ /* sentinel */ }
+};
+
+static const struct of_device_id lt9611uxc_match_table[] = {
+	{ .compatible = "lontium,lt9611uxc" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lt9611uxc_match_table);
+
+static struct i2c_driver lt9611uxc_driver = {
+	.driver = {
+		.name = "lt9611uxc",
+		.of_match_table = lt9611uxc_match_table,
+	},
+	.probe = lt9611uxc_probe,
+	.remove = lt9611uxc_remove,
+	.id_table = lt9611uxc_id,
+};
+module_i2c_driver(lt9611uxc_driver);
+
+MODULE_LICENSE("GPL v2");