diff mbox

[RFC,2/3] drm/panel: Add simple panel support

Message ID 1377876321-26835-3-git-send-email-treding@nvidia.com
State Superseded
Headers show

Commit Message

Thierry Reding Aug. 30, 2013, 3:25 p.m. UTC
Add a driver for simple panels. Such panels can have a regulator that
provides the supply voltage and a separate GPIO to enable the panel.
Optionally the panels can have a backlight associated with them so it
can be enabled or disabled according to the panel's power management
mode.

Support is added for three panels: An AU Optronics 10.1" WSVGA, a
Chunghwa Picture Tubes 10.1" WXGA and a Panasonic 10.1 WUXGA TFT LCD
panel.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 .../devicetree/bindings/panel/panel-simple.txt     |  25 ++
 drivers/gpu/drm/Makefile                           |   1 +
 drivers/gpu/drm/panel/Kconfig                      |  13 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-simple.c               | 335 +++++++++++++++++++++
 5 files changed, 375 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/panel/panel-simple.txt
 create mode 100644 drivers/gpu/drm/panel/Makefile
 create mode 100644 drivers/gpu/drm/panel/panel-simple.c

Comments

Kumar Gala Aug. 30, 2013, 7:24 p.m. UTC | #1
On Aug 30, 2013, at 10:25 AM, Thierry Reding wrote:

> Add a driver for simple panels. Such panels can have a regulator that
> provides the supply voltage and a separate GPIO to enable the panel.
> Optionally the panels can have a backlight associated with them so it
> can be enabled or disabled according to the panel's power management
> mode.
> 
> Support is added for three panels: An AU Optronics 10.1" WSVGA, a
> Chunghwa Picture Tubes 10.1" WXGA and a Panasonic 10.1 WUXGA TFT LCD
> panel.
> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
> .../devicetree/bindings/panel/panel-simple.txt     |  25 ++
> drivers/gpu/drm/Makefile                           |   1 +
> drivers/gpu/drm/panel/Kconfig                      |  13 +
> drivers/gpu/drm/panel/Makefile                     |   1 +
> drivers/gpu/drm/panel/panel-simple.c               | 335 +++++++++++++++++++++
> 5 files changed, 375 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/panel/panel-simple.txt
> create mode 100644 drivers/gpu/drm/panel/Makefile
> create mode 100644 drivers/gpu/drm/panel/panel-simple.c
> 
> diff --git a/Documentation/devicetree/bindings/panel/panel-simple.txt b/Documentation/devicetree/bindings/panel/panel-simple.txt
> new file mode 100644
> index 0000000..dfd4b76
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/panel/panel-simple.txt
> @@ -0,0 +1,25 @@
> +Simple display panel
> +
> +Required properties:
> +- compatible: should be one of:
> +  - "auo,b101aw03": AU Optronics Corporation 10.1" WSVGA TFT LCD panel
> +  - "cptt,claa101wb03": Chunghwa Picture Tubes Ltd. 10.1" WXGA TFT LCD panel
> +  - "pc,vvx10f004b00": Panasonic Corporation 10.1" WUXGA TFT LCD panel
> +

It would seem there should be a more generic compatible to cover the basic "panel-simple" case.

> +Optional properties:
> +- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
> +- power-supply: regulator to provide the supply voltage
> +- enable-gpios: GPIO pin to enable or disable the panel
> +- backlight: phandle of the backlight device attached to the panel
> +

If these are all optional, what does it mean to be a "panel-simple"?

> +Example:
> +
> +	panel: panel {
> +		compatible = "cptt,claa101wb01";
> +		ddc-i2c-bus = <&panelddc>;
> +
> +		power-supply = <&vdd_pnl_reg>;
> +		enable-gpios = <&gpio 90 0>;
> +
> +		backlight = <&backlight>;
> +	};

We'd normally do this as unique binding specs for the specific devices and a generic one to cover the concepts of a simple panel.  Who know if in the future a 'auo,b101aw03' might want some other unique properties.

[snip]

- k
Stephen Warren Sept. 3, 2013, 6:49 p.m. UTC | #2
On 08/30/2013 01:24 PM, Kumar Gala wrote:
> 
> On Aug 30, 2013, at 10:25 AM, Thierry Reding wrote:
> 
>> Add a driver for simple panels. Such panels can have a regulator that
>> provides the supply voltage and a separate GPIO to enable the panel.
>> Optionally the panels can have a backlight associated with them so it
>> can be enabled or disabled according to the panel's power management
>> mode.
>>
>> Support is added for three panels: An AU Optronics 10.1" WSVGA, a
>> Chunghwa Picture Tubes 10.1" WXGA and a Panasonic 10.1 WUXGA TFT LCD
>> panel.

>> diff --git a/Documentation/devicetree/bindings/panel/panel-simple.txt b/Documentation/devicetree/bindings/panel/panel-simple.txt

>> +Required properties:
>> +- compatible: should be one of:
>> +  - "auo,b101aw03": AU Optronics Corporation 10.1" WSVGA TFT LCD panel
>> +  - "cptt,claa101wb03": Chunghwa Picture Tubes Ltd. 10.1" WXGA TFT LCD panel
>> +  - "pc,vvx10f004b00": Panasonic Corporation 10.1" WUXGA TFT LCD panel
>> +
> 
> It would seem there should be a more generic compatible to cover the basic "panel-simple" case.

I would suggest only documenting "simple-panel" here, and not
documenting the specific panels at all; the panel-specific compatible
values would show up simply due to the rule that all compatible values
in *.dts should contain the exact HW model (e.g. "auo,b101aw03"), plus
any HW they're compatible with (i.e. "simple-panel").

I'd suggest "simple-panel" rather than "panel-simple" since IIRC other
simple bindings are "simple-xxx" rather than "xxx-simple".

>> +Optional properties:
>> +- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
>> +- power-supply: regulator to provide the supply voltage
>> +- enable-gpios: GPIO pin to enable or disable the panel
>> +- backlight: phandle of the backlight device attached to the panel
>> +
> 
> If these are all optional, what does it mean to be a "panel-simple"?

I think at least ddc-i2c-bus and backlight should be required
properties. I suppose it might be possible for the panel to be
always-on, and hence enable-gpios/power-supply could be optional?
Stephen Warren Sept. 3, 2013, 6:52 p.m. UTC | #3
On 08/30/2013 09:25 AM, Thierry Reding wrote:
> Add a driver for simple panels. Such panels can have a regulator that
> provides the supply voltage and a separate GPIO to enable the panel.
> Optionally the panels can have a backlight associated with them so it
> can be enabled or disabled according to the panel's power management
> mode.

> diff --git a/Documentation/devicetree/bindings/panel/panel-simple.txt b/Documentation/devicetree/bindings/panel/panel-simple.txt

> +Simple display panel
> +
> +Required properties:
> +- compatible: should be one of:
> +  - "auo,b101aw03": AU Optronics Corporation 10.1" WSVGA TFT LCD panel
> +  - "cptt,claa101wb03": Chunghwa Picture Tubes Ltd. 10.1" WXGA TFT LCD panel
> +  - "pc,vvx10f004b00": Panasonic Corporation 10.1" WUXGA TFT LCD panel
> +
> +Optional properties:
> +- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
> +- power-supply: regulator to provide the supply voltage
> +- enable-gpios: GPIO pin to enable or disable the panel
> +- backlight: phandle of the backlight device attached to the panel

Do we need to represent the timing requirements e.g. between panel
enable and backlight enable, or do you expect the driver to hard-code
this based on the compatible value?

Looking at the driver code, it seems that it has direct knowledge of the
video mode that each panel supports, so DDC is actually optional unlike
what I asserted/assumed in my previous response. As such, I guess we
should have a separate DT binding document for each of the three panels
(compatible values) listed above that pretty much just says "go look at
simple-panel.txt".
Thierry Reding Sept. 4, 2013, 2:38 p.m. UTC | #4
On Tue, Sep 03, 2013 at 12:52:36PM -0600, Stephen Warren wrote:
> On 08/30/2013 09:25 AM, Thierry Reding wrote:
> > Add a driver for simple panels. Such panels can have a regulator that
> > provides the supply voltage and a separate GPIO to enable the panel.
> > Optionally the panels can have a backlight associated with them so it
> > can be enabled or disabled according to the panel's power management
> > mode.
> 
> > diff --git a/Documentation/devicetree/bindings/panel/panel-simple.txt b/Documentation/devicetree/bindings/panel/panel-simple.txt
> 
> > +Simple display panel
> > +
> > +Required properties:
> > +- compatible: should be one of:
> > +  - "auo,b101aw03": AU Optronics Corporation 10.1" WSVGA TFT LCD panel
> > +  - "cptt,claa101wb03": Chunghwa Picture Tubes Ltd. 10.1" WXGA TFT LCD panel
> > +  - "pc,vvx10f004b00": Panasonic Corporation 10.1" WUXGA TFT LCD panel
> > +
> > +Optional properties:
> > +- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
> > +- power-supply: regulator to provide the supply voltage
> > +- enable-gpios: GPIO pin to enable or disable the panel
> > +- backlight: phandle of the backlight device attached to the panel
> 
> Do we need to represent the timing requirements e.g. between panel
> enable and backlight enable, or do you expect the driver to hard-code
> this based on the compatible value?

Yes, I'd expect the driver to hard-code that, similar to how the video
mode is hardcoded. ddc-i2c-bus support hasn't even been implemented yet.
I was planning to do that because one of the panels (the Chunghwa I
think) actually is connected via DDC. What I was going to do was prefer
a hardcoded mode over EDID to allow a driver to override a faulty EDID.

> Looking at the driver code, it seems that it has direct knowledge of the
> video mode that each panel supports, so DDC is actually optional unlike
> what I asserted/assumed in my previous response. As such, I guess we
> should have a separate DT binding document for each of the three panels
> (compatible values) listed above that pretty much just says "go look at
> simple-panel.txt".

Okay, I suppose that makes sense.

Thierry
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/panel/panel-simple.txt b/Documentation/devicetree/bindings/panel/panel-simple.txt
new file mode 100644
index 0000000..dfd4b76
--- /dev/null
+++ b/Documentation/devicetree/bindings/panel/panel-simple.txt
@@ -0,0 +1,25 @@ 
+Simple display panel
+
+Required properties:
+- compatible: should be one of:
+  - "auo,b101aw03": AU Optronics Corporation 10.1" WSVGA TFT LCD panel
+  - "cptt,claa101wb03": Chunghwa Picture Tubes Ltd. 10.1" WXGA TFT LCD panel
+  - "pc,vvx10f004b00": Panasonic Corporation 10.1" WUXGA TFT LCD panel
+
+Optional properties:
+- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
+- power-supply: regulator to provide the supply voltage
+- enable-gpios: GPIO pin to enable or disable the panel
+- backlight: phandle of the backlight device attached to the panel
+
+Example:
+
+	panel: panel {
+		compatible = "cptt,claa101wb01";
+		ddc-i2c-bus = <&panelddc>;
+
+		power-supply = <&vdd_pnl_reg>;
+		enable-gpios = <&gpio 90 0>;
+
+		backlight = <&backlight>;
+	};
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 9b009c7..764a5ec 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -57,3 +57,4 @@  obj-$(CONFIG_DRM_TILCDC)	+= tilcdc/
 obj-$(CONFIG_DRM_QXL) += qxl/
 obj-$(CONFIG_DRM_MSM) += msm/
 obj-y			+= i2c/
+obj-y			+= panel/
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 2ddd5bd..843087b 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -2,3 +2,16 @@  menuconfig DRM_PANEL
 	bool "DRM panel support"
 	help
 	  Panel registration and lookup framework.
+
+if DRM_PANEL
+
+config DRM_PANEL_SIMPLE
+	bool "support for simple panels"
+	depends on OF
+	help
+	  DRM panel driver for dumb panels that need at most a regulator and
+	  a GPIO to be powered up. Optionally a backlight can be attached so
+	  that it can be automatically turned off when the panel goes into a
+	  low power state.
+
+endif
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
new file mode 100644
index 0000000..af9dfa2
--- /dev/null
+++ b/drivers/gpu/drm/panel/Makefile
@@ -0,0 +1 @@ 
+obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
new file mode 100644
index 0000000..e38cd6f
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -0,0 +1,335 @@ 
+/*
+ * Copyright (C) 2013, NVIDIA Corporation.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/backlight.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_panel.h>
+
+struct panel_desc {
+	const struct drm_display_mode *modes;
+	unsigned int num_modes;
+
+	struct {
+		unsigned int width;
+		unsigned int height;
+	} size;
+};
+
+struct panel_simple {
+	struct drm_panel base;
+
+	const struct panel_desc *desc;
+
+	struct backlight_device *backlight;
+	struct regulator *supply;
+
+	unsigned long enable_gpio_flags;
+	int enable_gpio;
+};
+
+static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
+{
+	return container_of(panel, struct panel_simple, base);
+}
+
+static void panel_simple_dpms(struct drm_panel *panel, int mode)
+{
+	struct panel_simple *p = to_panel_simple(panel);
+	int err;
+
+	if (mode == DRM_MODE_DPMS_ON) {
+		if (p->supply) {
+			err = regulator_enable(p->supply);
+			if (err < 0)
+				dev_err(panel->dev,
+					"failed to enable supply: %d\n",
+					err);
+		}
+
+		if (gpio_is_valid(p->enable_gpio)) {
+			if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
+				gpio_set_value(p->enable_gpio, 0);
+			else
+				gpio_set_value(p->enable_gpio, 1);
+		}
+	}
+
+	if (p->backlight) {
+		if (mode != DRM_MODE_DPMS_ON)
+			p->backlight->props.power = FB_BLANK_POWERDOWN;
+		else
+			p->backlight->props.power = FB_BLANK_UNBLANK;
+
+		backlight_update_status(p->backlight);
+	}
+
+	if (mode == DRM_MODE_DPMS_OFF) {
+		if (gpio_is_valid(p->enable_gpio)) {
+			if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
+				gpio_set_value(p->enable_gpio, 1);
+			else
+				gpio_set_value(p->enable_gpio, 0);
+		}
+
+		if (p->supply)
+			regulator_disable(p->supply);
+	}
+}
+
+static int panel_simple_get_modes(struct drm_panel *panel)
+{
+	struct panel_simple *p = to_panel_simple(panel);
+	struct drm_display_mode *mode;
+	unsigned int i;
+
+	for (i = 0; i < p->desc->num_modes; i++) {
+		mode = drm_mode_duplicate(panel->drm, &p->desc->modes[i]);
+		if (!mode)
+			return -ENOMEM;
+
+		drm_mode_set_name(mode);
+
+		drm_mode_probed_add(panel->connector, mode);
+	}
+
+	return p->desc->num_modes;
+}
+
+static const struct drm_panel_funcs panel_simple_funcs = {
+	.dpms = panel_simple_dpms,
+	.get_modes = panel_simple_get_modes,
+};
+
+static const struct drm_display_mode auo_b101aw03_mode = {
+	.clock = 51450,
+	.hdisplay = 1024,
+	.hsync_start = 1024 + 156,
+	.hsync_end = 1024 + 156 + 8,
+	.htotal = 1024 + 156 + 8 + 156,
+	.vdisplay = 600,
+	.vsync_start = 600 + 16,
+	.vsync_end = 600 + 16 + 6,
+	.vtotal = 600 + 16 + 6 + 16,
+	.vrefresh = 60,
+};
+
+static const struct panel_desc auo_b101aw03 = {
+	.modes = &auo_b101aw03_mode,
+	.num_modes = 1,
+	.size = {
+		.width = 223,
+		.height = 125,
+	},
+};
+
+static const struct drm_display_mode chunghwa_claa101wb01_mode = {
+	.clock = 69300,
+	.hdisplay = 1366,
+	.hsync_start = 1366 + 48,
+	.hsync_end = 1366 + 48 + 32,
+	.htotal = 1366 + 48 + 32 + 20,
+	.vdisplay = 768,
+	.vsync_start = 768 + 16,
+	.vsync_end = 768 + 16 + 8,
+	.vtotal = 768 + 16 + 8 + 16,
+	.vrefresh = 60,
+};
+
+static const struct panel_desc chunghwa_claa101wb01 = {
+	.modes = &chunghwa_claa101wb01_mode,
+	.num_modes = 1,
+	.size = {
+		.width = 223,
+		.height = 125,
+	},
+};
+
+static const struct drm_display_mode panasonic_vvx10f004b00_mode = {
+	.clock = 154700,
+	.hdisplay = 1920,
+	.hsync_start = 1920 + 154,
+	.hsync_end = 1920 + 154 + 16,
+	.htotal = 1920 + 154 + 16 + 32,
+	.vdisplay = 1200,
+	.vsync_start = 1200 + 17,
+	.vsync_end = 1200 + 17 + 2,
+	.vtotal = 1200 + 17 + 2 + 16,
+	.vrefresh = 60,
+};
+
+static const struct panel_desc panasonic_vvx10f004b00 = {
+	.modes = &panasonic_vvx10f004b00_mode,
+	.num_modes = 1,
+	.size = {
+		.width = 217,
+		.height = 136,
+	},
+};
+
+static const struct of_device_id panel_simple_of_match[] = {
+	{
+		.compatible = "auo,b101aw03",
+		.data = &auo_b101aw03,
+	}, {
+		.compatible = "cptt,claa101wb01",
+		.data = &chunghwa_claa101wb01
+	}, {
+		.compatible = "pc,vvx10f004b00",
+		.data = &panasonic_vvx10f004b00
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, panel_simple_of_match);
+
+static int panel_simple_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *id;
+	struct device_node *backlight;
+	struct panel_simple *panel;
+	enum of_gpio_flags flags;
+	int err;
+
+	panel = devm_kzalloc(&pdev->dev, sizeof(*panel), GFP_KERNEL);
+	if (!panel)
+		return -ENOMEM;
+
+	id = of_match_node(panel_simple_of_match, pdev->dev.of_node);
+	if (!id)
+		return -ENODEV;
+
+	panel->desc = id->data;
+
+	panel->supply = devm_regulator_get_optional(&pdev->dev, "power");
+	if (IS_ERR(panel->supply)) {
+		if (PTR_ERR(panel->supply) != -ENODEV) {
+			dev_err(&pdev->dev, "failed to get regulator: %ld\n",
+				PTR_ERR(panel->supply));
+			return PTR_ERR(panel->supply);
+		}
+
+		panel->supply = NULL;
+	}
+
+	panel->enable_gpio = of_get_named_gpio_flags(pdev->dev.of_node,
+						     "enable-gpios", 0,
+						     &flags);
+	if (gpio_is_valid(panel->enable_gpio)) {
+		unsigned int value;
+
+		if (flags & OF_GPIO_ACTIVE_LOW)
+			panel->enable_gpio_flags |= GPIO_ACTIVE_LOW;
+
+		err = gpio_request(panel->enable_gpio, "enable");
+		if (err < 0) {
+			dev_err(&pdev->dev, "failed to request GPIO#%u: %d\n",
+				panel->enable_gpio, err);
+			return err;
+		}
+
+		value = (panel->enable_gpio_flags & GPIO_ACTIVE_LOW) != 0;
+
+		err = gpio_direction_output(panel->enable_gpio, value);
+		if (err < 0) {
+			dev_err(&pdev->dev, "failed to setup GPIO%u: %d\n",
+				panel->enable_gpio, err);
+			goto free_gpio;
+		}
+	}
+
+	backlight = of_parse_phandle(pdev->dev.of_node, "backlight", 0);
+	if (backlight) {
+		panel->backlight = of_find_backlight_by_node(backlight);
+		if (!panel->backlight) {
+			err = -EPROBE_DEFER;
+			goto free_gpio;
+		}
+
+		of_node_put(backlight);
+	}
+
+	drm_panel_init(&panel->base);
+	panel->base.dev = &pdev->dev;
+	panel->base.funcs = &panel_simple_funcs;
+
+	err = drm_panel_add(&panel->base);
+	if (err < 0)
+		goto free_gpio;
+
+	platform_set_drvdata(pdev, panel);
+
+	return 0;
+
+free_gpio:
+	if (gpio_is_valid(panel->enable_gpio))
+		gpio_free(panel->enable_gpio);
+
+	return err;
+}
+
+static int panel_simple_remove(struct platform_device *pdev)
+{
+	struct panel_simple *panel = platform_get_drvdata(pdev);
+
+	if (gpio_is_valid(panel->enable_gpio)) {
+		if (panel->enable_gpio_flags & GPIO_ACTIVE_LOW)
+			gpio_set_value(panel->enable_gpio, 1);
+		else
+			gpio_set_value(panel->enable_gpio, 0);
+
+		gpio_free(panel->enable_gpio);
+	}
+
+	if (panel->supply)
+		regulator_disable(panel->supply);
+
+	if (panel->backlight)
+		put_device(&panel->backlight->dev);
+
+	drm_panel_detach(&panel->base);
+	drm_panel_remove(&panel->base);
+
+	return 0;
+}
+
+static struct platform_driver panel_simple_driver = {
+	.driver = {
+		.name = "panel-simple",
+		.owner = THIS_MODULE,
+		.of_match_table = panel_simple_of_match,
+	},
+	.probe = panel_simple_probe,
+	.remove = panel_simple_remove,
+};
+module_platform_driver(panel_simple_driver);
+
+MODULE_DESCRIPTION("DRM Driver for Simple Panels");
+MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
+MODULE_LICENSE("GPL v2");