From: Vincent Palatin <vpalatin@xxxxxxxxxxxx>
This patch adds drm_bridge driver for parade DisplayPort
to LVDS bridge chip.
Signed-off-by: Vincent Palatin <vpalatin@xxxxxxxxxxxx>
Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx>
---
.../devicetree/bindings/drm/bridge/ps8622.txt | 21 +
drivers/gpu/drm/bridge/Kconfig | 8 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/ps8622.c | 475 ++++++++++++++++++++
include/drm/bridge/ps8622.h | 41 ++
5 files changed, 546 insertions(+)
create mode 100644 Documentation/devicetree/bindings/drm/bridge/ps8622.txt
create mode 100644 drivers/gpu/drm/bridge/ps8622.c
create mode 100644 include/drm/bridge/ps8622.h
diff --git a/Documentation/devicetree/bindings/drm/bridge/ps8622.txt b/Documentation/devicetree/bindings/drm/bridge/ps8622.txt
new file mode 100644
index 0000000..1afbd9c
--- /dev/null
+++ b/Documentation/devicetree/bindings/drm/bridge/ps8622.txt
@@ -0,0 +1,21 @@
+ps8622-bridge bindings
+
+Required properties:
+ - compatible: "parade,ps8622"
+ - reg: first i2c address of the bridge
+ - sleep-gpio: OF device-tree gpio specification
+ - reset-gpio: OF device-tree gpio specification
+
+Optional properties:
+ - lane-count: number of DP lanes to use
+ - use-external-pwm: backlight will be controlled by an external PWM
+
+Example:
+ ps8622-bridge@48 {
+ compatible = "parade,ps8622";
+ reg = <0x48>;
+ sleep-gpio = <&gpc3 6 1 0 0>;
+ reset-gpio = <&gpc3 1 1 0 0>;
+ display-timings = <&lcd_display_timings>;
+ lane-count = <1>
+ };
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index e3fb487..7b843c8 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -10,3 +10,11 @@ config DRM_PANEL_BINDER
select DRM_KMS_HELPER
select DRM_PANEL
---help---
+
+config DRM_PS8622
+ tristate "Parade eDP/LVDS bridge"
+ depends on DRM
+ select DRM_KMS_HELPER
+ select BACKLIGHT_LCD_SUPPORT
+ select BACKLIGHT_CLASS_DEVICE
+ ---help---
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index ba8b5b8..b494d4b 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -2,3 +2,4 @@ ccflags-y := -Iinclude/drm
obj-$(CONFIG_DRM_PTN3460) += ptn3460.o
obj-$(CONFIG_DRM_PANEL_BINDER) += panel_binder.o
+obj-$(CONFIG_DRM_PS8622) += ps8622.o
diff --git a/drivers/gpu/drm/bridge/ps8622.c b/drivers/gpu/drm/bridge/ps8622.c
new file mode 100644
index 0000000..387d332
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ps8622.c
@@ -0,0 +1,475 @@
+/*
+ * Parade PS8622 eDP/LVDS bridge driver
+ *
+ * Copyright (C) 2014 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/module.h>
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#include "drmP.h"
+#include "drm_crtc.h"
+#include "drm_crtc_helper.h"
+
+struct ps8622_bridge {
+ struct drm_bridge *bridge;
+ struct drm_encoder *encoder;
+ struct i2c_client *client;
+ struct regulator *v12;
+ struct backlight_device *bl;
+ struct mutex enable_mutex;
+
+ int gpio_slp_n;
+ int gpio_rst_n;
+
+ u8 max_lane_count;
+ u8 lane_count;
+
+ bool enabled;
+};
+
+struct ps8622_device_data {
+ u8 max_lane_count;
+};
+
+static const struct ps8622_device_data ps8622_data = {
+ .max_lane_count = 1,
+};
+
+static const struct ps8622_device_data ps8625_data = {
+ .max_lane_count = 2,
+};
+
+/* Brightness scale on the Parade chip */
+#define PS8622_MAX_BRIGHTNESS 0xff
+
+/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
+#define PS8622_POWER_RISE_T1_MIN_US 10
+#define PS8622_POWER_RISE_T1_MAX_US 10000
+#define PS8622_RST_HIGH_T2_MIN_US 3000
+#define PS8622_RST_HIGH_T2_MAX_US 30000
+#define PS8622_PWMO_END_T12_MS 200
+#define PS8622_POWER_FALL_T16_MAX_US 10000
+#define PS8622_POWER_OFF_T17_MS 500
+
+#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
+ (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
+#error "T2.min + T1.max must be less than T2.max + T1.min"
+#endif
+
+static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
+{
+ int ret;
+ struct i2c_adapter *adap = client->adapter;
+ struct i2c_msg msg;
+ u8 data[] = {reg, val};
+
+ msg.addr = client->addr + page;
+ msg.flags = 0;
+ msg.len = sizeof(data);
+ msg.buf = data;
+
+ ret = i2c_transfer(adap, &msg, 1);
+ if (ret != 1)
+ pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
+ client->addr + page, reg, val, ret);
+ return !(ret == 1);
+}
+
+static int ps8622_send_config(struct ps8622_bridge *ps_bridge)
+{
+ struct i2c_client *cl = ps_bridge->client;
+ int err = 0;
+
+ /* wait 20ms after power ON */
+ usleep_range(20000, 30000);
+
+ err |= ps8622_set(cl, 0x02, 0xa1, 0x01); /* HPD low */
+ /* SW setting */
+ err |= ps8622_set(cl, 0x04, 0x14, 0x01); /* [1:0] SW output 1.2V voltage
+ * is lower to 96% */
+ /* RCO SS setting */
+ err |= ps8622_set(cl, 0x04, 0xe3, 0x20); /* [5:4] = b01 0.5%, b10 1%,
+ * b11 1.5% */
+ err |= ps8622_set(cl, 0x04, 0xe2, 0x80); /* [7] RCO SS enable */
+ /* RPHY Setting */
+ err |= ps8622_set(cl, 0x04, 0x8a, 0x0c); /* [3:2] CDR tune wait cycle
+ * before measure for fine tune
+ * b00: 1us b01: 0.5us b10:2us
+ * b11: 4us */
+ err |= ps8622_set(cl, 0x04, 0x89, 0x08); /* [3] RFD always on */
+ err |= ps8622_set(cl, 0x04, 0x71, 0x2d); /* CTN lock in/out:
+ * 20000ppm/80000ppm.
+ * Lock out 2 times. */
+ /* 2.7G CDR settings */
+ err |= ps8622_set(cl, 0x04, 0x7d, 0x07); /* NOF=40LSB for HBR CDR
+ * setting */
+ err |= ps8622_set(cl, 0x04, 0x7b, 0x00); /* [1:0] Fmin=+4bands */
+ err |= ps8622_set(cl, 0x04, 0x7a, 0xfd); /* [7:5] DCO_FTRNG=+-40% */
+ /* 1.62G CDR settings */
+ err |= ps8622_set(cl, 0x04, 0xc0, 0x12); /* [5:2]NOF=64LSB [1:0]DCO
+ * scale is 2/5 */
+ err |= ps8622_set(cl, 0x04, 0xc1, 0x92); /* Gitune=-37% */
+ err |= ps8622_set(cl, 0x04, 0xc2, 0x1c); /* Fbstep=100% */
+ err |= ps8622_set(cl, 0x04, 0x32, 0x80); /* [7] LOS signal disable */
+ /* RPIO Setting */
+ err |= ps8622_set(cl, 0x04, 0x00, 0xb0); /* [7:4] LVDS driver bias
+ * current : 75% (250mV swing)
+ * */
+ err |= ps8622_set(cl, 0x04, 0x15, 0x40); /* [7:6] Right-bar GPIO output
+ * strength is 8mA */
+ /* EQ Training State Machine Setting */
+ err |= ps8622_set(cl, 0x04, 0x54, 0x10); /* RCO calibration start */
+ /* Logic, needs more than 10 I2C command */
+ err |= ps8622_set(cl, 0x01, 0x02, 0x80 | ps_bridge->max_lane_count);
+ /* [4:0] MAX_LANE_COUNT set to
+ * max supported lanes */
+ err |= ps8622_set(cl, 0x01, 0x21, 0x80 | ps_bridge->lane_count);
+ /* [4:0] LANE_COUNT_SET set to
+ * chosen lane count */
+ err |= ps8622_set(cl, 0x00, 0x52, 0x20);
+ err |= ps8622_set(cl, 0x00, 0xf1, 0x03); /* HPD CP toggle enable */
+ err |= ps8622_set(cl, 0x00, 0x62, 0x41);
+ err |= ps8622_set(cl, 0x00, 0xf6, 0x01); /* Counter number, add 1ms
+ * counter delay */
+ err |= ps8622_set(cl, 0x00, 0x77, 0x06); /* [6]PWM function control by
+ * DPCD0040f[7], default is PWM
+ * block always works. */
+ err |= ps8622_set(cl, 0x00, 0x4c, 0x04); /* 04h Adjust VTotal tolerance
+ * to fix the 30Hz no display
+ * issue */
+ err |= ps8622_set(cl, 0x01, 0xc0, 0x00); /* DPCD00400='h00, Parade OUI =
+ * 'h001cf8 */
+ err |= ps8622_set(cl, 0x01, 0xc1, 0x1c); /* DPCD00401='h1c */
+ err |= ps8622_set(cl, 0x01, 0xc2, 0xf8); /* DPCD00402='hf8 */
+ err |= ps8622_set(cl, 0x01, 0xc3, 0x44); /* DPCD403~408 = ASCII code
+ * D2SLV5='h4432534c5635 */
+ err |= ps8622_set(cl, 0x01, 0xc4, 0x32); /* DPCD404 */
+ err |= ps8622_set(cl, 0x01, 0xc5, 0x53); /* DPCD405 */
+ err |= ps8622_set(cl, 0x01, 0xc6, 0x4c); /* DPCD406 */
+ err |= ps8622_set(cl, 0x01, 0xc7, 0x56); /* DPCD407 */
+ err |= ps8622_set(cl, 0x01, 0xc8, 0x35); /* DPCD408 */
+ err |= ps8622_set(cl, 0x01, 0xca, 0x01); /* DPCD40A, Initial Code major
+ * revision '01' */
+ err |= ps8622_set(cl, 0x01, 0xcb, 0x05); /* DPCD40B, Initial Code minor
+ * revision '05' */
+ if (ps_bridge->bl) {
+ err |= ps8622_set(cl, 0x01, 0xa5, 0xa0);
+ /* DPCD720, internal PWM */
+ err |= ps8622_set(cl, 0x01, 0xa7,
+ ps_bridge->bl->props.brightness);
+ /* FFh for 100% brightness,
+ * 0h for 0% brightness */
+ } else {
+ err |= ps8622_set(cl, 0x01, 0xa5, 0x80);
+ /* DPCD720, external PWM */
+ }
+ err |= ps8622_set(cl, 0x01, 0xcc, 0x13); /* Set LVDS output as 6bit-VESA
+ * mapping, single LVDS channel
+ * */
+ err |= ps8622_set(cl, 0x02, 0xb1, 0x20); /* Enable SSC set by register
+ * */
+ err |= ps8622_set(cl, 0x04, 0x10, 0x16); /* Set SSC enabled and +/-1%
+ * central spreading */
+ /* Logic end */
+ err |= ps8622_set(cl, 0x04, 0x59, 0x60); /* MPU Clock source: LC => RCO
+ * */
+ err |= ps8622_set(cl, 0x04, 0x54, 0x14); /* LC -> RCO */
+ err |= ps8622_set(cl, 0x02, 0xa1, 0x91); /* HPD high */
+
+ return err ? -EIO : 0;
+}
+
+static int ps8622_backlight_update(struct backlight_device *bl)
+{
+ struct ps8622_bridge *ps_bridge = dev_get_drvdata(&bl->dev);
+ int ret, brightness = bl->props.brightness;
+
+ if (bl->props.power != FB_BLANK_UNBLANK ||
+ bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+ brightness = 0;
+
+ mutex_lock(&ps_bridge->enable_mutex);
+
+ if (!ps_bridge->enabled) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = ps8622_set(ps_bridge->client, 0x01, 0xa7, brightness);
+
+out:
+ mutex_unlock(&ps_bridge->enable_mutex);
+ return ret;
+}
+
+static int ps8622_backlight_get(struct backlight_device *bl)
+{
+ return bl->props.brightness;
+}
+
+static const struct backlight_ops ps8622_backlight_ops = {
+ .update_status = ps8622_backlight_update,
+ .get_brightness = ps8622_backlight_get,
+};
+
+static void ps8622_pre_enable(struct drm_bridge *bridge)
+{
+ struct ps8622_bridge *ps_bridge = bridge->driver_private;
+ int ret;
+
+ mutex_lock(&ps_bridge->enable_mutex);
+ if (ps_bridge->enabled)
+ goto out;
+
+ if (gpio_is_valid(ps_bridge->gpio_rst_n))
+ gpio_set_value(ps_bridge->gpio_rst_n, 0);
+
+ if (ps_bridge->v12) {
+ ret = regulator_enable(ps_bridge->v12);
+ if (ret)
+ DRM_ERROR("fails to enable ps_bridge->v12");
+ }
+
+ drm_next_bridge_pre_enable(bridge);
+
+ if (gpio_is_valid(ps_bridge->gpio_slp_n))
+ gpio_set_value(ps_bridge->gpio_slp_n, 1);
+
+ /*
+ * T1 is the range of time that it takes for the power to rise after we
+ * enable the lcd fet. T2 is the range of time in which the data sheet
+ * specifies we should deassert the reset pin.
+ *
+ * If it takes T1.max for the power to rise, we need to wait atleast
+ * T2.min before deasserting the reset pin. If it takes T1.min for the
+ * power to rise, we need to wait at most T2.max before deasserting the
+ * reset pin.
+ */
+ usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
+ PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
+
+ if (gpio_is_valid(ps_bridge->gpio_rst_n))
+ gpio_set_value(ps_bridge->gpio_rst_n, 1);
+
+ ret = ps8622_send_config(ps_bridge);
+ if (ret)
+ DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
+
+ ps_bridge->enabled = true;
+
+out:
+ mutex_unlock(&ps_bridge->enable_mutex);
+}
+
+static void ps8622_enable(struct drm_bridge *bridge)
+{
+ struct ps8622_bridge *ps_bridge = bridge->driver_private;
+
+ mutex_lock(&ps_bridge->enable_mutex);
+ drm_next_bridge_enable(bridge);
+ mutex_unlock(&ps_bridge->enable_mutex);
+}
+
+static void ps8622_disable(struct drm_bridge *bridge)
+{
+ struct ps8622_bridge *ps_bridge = bridge->driver_private;
+
+ mutex_lock(&ps_bridge->enable_mutex);
+
+ if (!ps_bridge->enabled)
+ goto out;
+
+ ps_bridge->enabled = false;
+
+ drm_next_bridge_disable(bridge);
+ msleep(PS8622_PWMO_END_T12_MS);
+
+ /*
+ * This doesn't matter if the regulators are turned off, but something
+ * else might keep them on. In that case, we want to assert the slp gpio
+ * to lower power.
+ */
+ if (gpio_is_valid(ps_bridge->gpio_slp_n))
+ gpio_set_value(ps_bridge->gpio_slp_n, 0);
+
+ if (ps_bridge->v12)
+ regulator_disable(ps_bridge->v12);
+
+ /*
+ * Sleep for at least the amount of time that it takes the power rail to
+ * fall to prevent asserting the rst gpio from doing anything.
+ */
+ usleep_range(PS8622_POWER_FALL_T16_MAX_US,
+ 2 * PS8622_POWER_FALL_T16_MAX_US);
+ if (gpio_is_valid(ps_bridge->gpio_rst_n))
+ gpio_set_value(ps_bridge->gpio_rst_n, 0);
+
+ msleep(PS8622_POWER_OFF_T17_MS);
+
+out:
+ mutex_unlock(&ps_bridge->enable_mutex);
+}
+
+static void ps8622_post_disable(struct drm_bridge *bridge)
+{
+ drm_next_bridge_post_disable(bridge);
+}
+
+static void ps8622_destroy(struct drm_bridge *bridge)
+{
+ struct ps8622_bridge *ps_bridge = bridge->driver_private;
+
+ drm_bridge_cleanup(bridge);
+ if (ps_bridge->bl)
+ backlight_device_unregister(ps_bridge->bl);
+
+ put_device(&ps_bridge->client->dev);
+}
+
+static const struct drm_bridge_funcs ps8622_bridge_funcs = {
+ .pre_enable = ps8622_pre_enable,
+ .enable = ps8622_enable,
+ .disable = ps8622_disable,
+ .post_disable = ps8622_post_disable,
+ .destroy = ps8622_destroy,
+};
+
+static const struct of_device_id ps8622_devices[] = {
+ {
+ .compatible = "parade,ps8622",
+ .data = &ps8622_data,
+ }, {
+ .compatible = "parade,ps8625",
+ .data = &ps8625_data,
+ }, {
+ /* end node */
+ }
+};
+
+struct drm_bridge *ps8622_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ struct i2c_client *client,
+ struct device_node *node)
+{
+ int ret;
+ const struct of_device_id *match;
+ const struct ps8622_device_data *device_data;
+ struct drm_bridge *bridge;
+ struct ps8622_bridge *ps_bridge;
+
+ node = of_find_matching_node_and_match(NULL, ps8622_devices, &match);
+ if (!node)
+ return NULL;
+
+ bridge = devm_kzalloc(dev->dev, sizeof(*bridge), GFP_KERNEL);
+ if (!bridge) {
+ DRM_ERROR("Failed to allocate drm bridge\n");
+ return NULL;
+ }
+
+ ps_bridge = devm_kzalloc(dev->dev, sizeof(*ps_bridge), GFP_KERNEL);
+ if (!ps_bridge) {
+ DRM_ERROR("could not allocate ps bridge\n");
+ return NULL;
+ }
+
+ mutex_init(&ps_bridge->enable_mutex);
+
+ device_data = match->data;
+ ps_bridge->client = client;
+ ps_bridge->encoder = encoder;
+ ps_bridge->bridge = bridge;
+ ps_bridge->v12 = devm_regulator_get(&client->dev, "vdd_bridge");
+ if (IS_ERR(ps_bridge->v12)) {
+ DRM_INFO("no 1.2v regulator found for PS8622\n");
+ ps_bridge->v12 = NULL;
+ }
+
+ ps_bridge->gpio_slp_n = of_get_named_gpio(node, "sleep-gpio", 0);
+ if (gpio_is_valid(ps_bridge->gpio_slp_n)) {
+ ret = devm_gpio_request_one(&client->dev, ps_bridge->gpio_slp_n,
+ GPIOF_OUT_INIT_HIGH,
+ "PS8622_SLP_N");
+ if (ret)
+ goto err_client;
+ }
+
+ ps_bridge->gpio_rst_n = of_get_named_gpio(node, "reset-gpio", 0);
+ if (gpio_is_valid(ps_bridge->gpio_rst_n)) {
+ /*
+ * Assert the reset pin high to avoid the bridge being
+ * initialized prematurely
+ */
+ ret = devm_gpio_request_one(&client->dev, ps_bridge->gpio_rst_n,
+ GPIOF_OUT_INIT_HIGH,
+ "PS8622_RST_N");
+ if (ret)
+ goto err_client;
+ }
+
+ ps_bridge->max_lane_count = device_data->max_lane_count;
+
+ if (of_property_read_u8(node, "lane-count", &ps_bridge->lane_count))
+ ps_bridge->lane_count = ps_bridge->max_lane_count;
+ else if (ps_bridge->lane_count > ps_bridge->max_lane_count) {
+ DRM_ERROR("lane-count property is too high for DP bridge\n");
+ ps_bridge->lane_count = ps_bridge->max_lane_count;
+ }
+
+ if (!of_find_property(node, "use-external-pwm", NULL)) {
+ ps_bridge->bl = backlight_device_register("ps8622-backlight",
+ dev->dev, ps_bridge, &ps8622_backlight_ops,
+ NULL);
+ if (IS_ERR(ps_bridge->bl)) {
+ DRM_ERROR("failed to register backlight\n");
+ ret = PTR_ERR(ps_bridge->bl);
+ ps_bridge->bl = NULL;
+ goto err_client;
+ }
+ ps_bridge->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
+ ps_bridge->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
+ }
+
+ ret = drm_bridge_init(dev, ps_bridge->bridge, &ps8622_bridge_funcs);
+ if (ret) {
+ DRM_ERROR("Failed to initialize bridge with drm\n");
+ goto err_backlight;
+ }
+
+ ps_bridge->bridge->driver_private = ps_bridge;
+ ps_bridge->enabled = false;
+
+ if (!encoder->bridge)
+ /* First entry in the bridge chain */
+ encoder->bridge = bridge;
+
+ return bridge;
+
+err_backlight:
+ if (ps_bridge->bl)
+ backlight_device_unregister(ps_bridge->bl);
+err_client:
+ put_device(&client->dev);
+ DRM_ERROR("device probe failed : %d\n", ret);
+ return NULL;
+}
+EXPORT_SYMBOL(ps8622_init);
diff --git a/include/drm/bridge/ps8622.h b/include/drm/bridge/ps8622.h
new file mode 100644
index 0000000..22f37b6
--- /dev/null
+++ b/include/drm/bridge/ps8622.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#ifndef _DRM_BRIDGE_PS8622_H_
+#define _DRM_BRIDGE_PS8622_H_
+
+struct drm_device;
+struct drm_encoder;
+struct i2c_client;
+struct device_node;
+
+#ifdef CONFIG_DRM_PS8622
+
+struct drm_bridge *ps8622_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ struct i2c_client *client,
+ struct device_node *node);
+
+#else
+
+static inline struct drm_bridge *ps8622_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ struct i2c_client *client,
+ struct device_node *node)
+{
+ return -ENODEV;
+}
+
+#endif
+
+#endif
--
1.7.9.5
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