[linux-2.6-block.git] / drivers / gpu / drm / tilcdc / tilcdc_panel.c

/*
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/consumer.h>
#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/videomode.h>

#include "tilcdc_drv.h"

struct panel_module {
	struct tilcdc_module base;
	struct tilcdc_panel_info *info;
	struct display_timings *timings;
	struct backlight_device *backlight;
	struct gpio_desc *enable_gpio;
};
#define to_panel_module(x) container_of(x, struct panel_module, base)


/*
 * Encoder:
 */

struct panel_encoder {
	struct drm_encoder base;
	struct panel_module *mod;
};
#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)

static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	struct backlight_device *backlight = panel_encoder->mod->backlight;
	struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;

	if (backlight) {
		backlight->props.power = mode == DRM_MODE_DPMS_ON ?
					 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
		backlight_update_status(backlight);
	}

	if (gpio)
		gpiod_set_value_cansleep(gpio,
					 mode == DRM_MODE_DPMS_ON ? 1 : 0);
}

static void panel_encoder_prepare(struct drm_encoder *encoder)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
	tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
}

static void panel_encoder_commit(struct drm_encoder *encoder)
{
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}

static void panel_encoder_mode_set(struct drm_encoder *encoder,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	/* nothing needed */
}

static const struct drm_encoder_funcs panel_encoder_funcs = {
		.destroy        = drm_encoder_cleanup,
};

static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
		.dpms           = panel_encoder_dpms,
		.prepare        = panel_encoder_prepare,
		.commit         = panel_encoder_commit,
		.mode_set       = panel_encoder_mode_set,
};

static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
		struct panel_module *mod)
{
	struct panel_encoder *panel_encoder;
	struct drm_encoder *encoder;
	int ret;

	panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
				     GFP_KERNEL);
	if (!panel_encoder) {
		dev_err(dev->dev, "allocation failed\n");
		return NULL;
	}

	panel_encoder->mod = mod;

	encoder = &panel_encoder->base;
	encoder->possible_crtcs = 1;

	ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
			DRM_MODE_ENCODER_LVDS, NULL);
	if (ret < 0)
		goto fail;

	drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);

	return encoder;

fail:
	drm_encoder_cleanup(encoder);
	return NULL;
}

/*
 * Connector:
 */

struct panel_connector {
	struct drm_connector base;

	struct drm_encoder *encoder;  /* our connected encoder */
	struct panel_module *mod;
};
#define to_panel_connector(x) container_of(x, struct panel_connector, base)


static void panel_connector_destroy(struct drm_connector *connector)
{
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
}

static enum drm_connector_status panel_connector_detect(
		struct drm_connector *connector,
		bool force)
{
	return connector_status_connected;
}

static int panel_connector_get_modes(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct panel_connector *panel_connector = to_panel_connector(connector);
	struct display_timings *timings = panel_connector->mod->timings;
	int i;

	for (i = 0; i < timings->num_timings; i++) {
		struct drm_display_mode *mode = drm_mode_create(dev);
		struct videomode vm;

		if (videomode_from_timings(timings, &vm, i))
			break;

		drm_display_mode_from_videomode(&vm, mode);

		mode->type = DRM_MODE_TYPE_DRIVER;

		if (timings->native_mode == i)
			mode->type |= DRM_MODE_TYPE_PREFERRED;

		drm_mode_set_name(mode);
		drm_mode_probed_add(connector, mode);
	}

	return i;
}

static int panel_connector_mode_valid(struct drm_connector *connector,
		  struct drm_display_mode *mode)
{
	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	/* our only constraints are what the crtc can generate: */
	return tilcdc_crtc_mode_valid(priv->crtc, mode);
}

static struct drm_encoder *panel_connector_best_encoder(
		struct drm_connector *connector)
{
	struct panel_connector *panel_connector = to_panel_connector(connector);
	return panel_connector->encoder;
}

static const struct drm_connector_funcs panel_connector_funcs = {
	.destroy            = panel_connector_destroy,
	.dpms               = drm_helper_connector_dpms,
	.detect             = panel_connector_detect,
	.fill_modes         = drm_helper_probe_single_connector_modes,
};

static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
	.get_modes          = panel_connector_get_modes,
	.mode_valid         = panel_connector_mode_valid,
	.best_encoder       = panel_connector_best_encoder,
};

static struct drm_connector *panel_connector_create(struct drm_device *dev,
		struct panel_module *mod, struct drm_encoder *encoder)
{
	struct panel_connector *panel_connector;
	struct drm_connector *connector;
	int ret;

	panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
				       GFP_KERNEL);
	if (!panel_connector) {
		dev_err(dev->dev, "allocation failed\n");
		return NULL;
	}

	panel_connector->encoder = encoder;
	panel_connector->mod = mod;

	connector = &panel_connector->base;

	drm_connector_init(dev, connector, &panel_connector_funcs,
			DRM_MODE_CONNECTOR_LVDS);
	drm_connector_helper_add(connector, &panel_connector_helper_funcs);

	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;

	ret = drm_mode_connector_attach_encoder(connector, encoder);
	if (ret)
		goto fail;

	drm_connector_register(connector);

	return connector;

fail:
	panel_connector_destroy(connector);
	return NULL;
}

/*
 * Module:
 */

static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
{
	struct panel_module *panel_mod = to_panel_module(mod);
	struct tilcdc_drm_private *priv = dev->dev_private;
	struct drm_encoder *encoder;
	struct drm_connector *connector;

	encoder = panel_encoder_create(dev, panel_mod);
	if (!encoder)
		return -ENOMEM;

	connector = panel_connector_create(dev, panel_mod, encoder);
	if (!connector)
		return -ENOMEM;

	priv->encoders[priv->num_encoders++] = encoder;
	priv->connectors[priv->num_connectors++] = connector;

	return 0;
}

static const struct tilcdc_module_ops panel_module_ops = {
		.modeset_init = panel_modeset_init,
};

/*
 * Device:
 */

/* maybe move this somewhere common if it is needed by other outputs? */
static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
{
	struct device_node *info_np;
	struct tilcdc_panel_info *info;
	int ret = 0;

	if (!np) {
		pr_err("%s: no devicenode given\n", __func__);
		return NULL;
	}

	info_np = of_get_child_by_name(np, "panel-info");
	if (!info_np) {
		pr_err("%s: could not find panel-info node\n", __func__);
		return NULL;
	}

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		pr_err("%s: allocation failed\n", __func__);
		of_node_put(info_np);
		return NULL;
	}

	ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
	ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
	ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
	ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
	ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
	ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
	ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
	ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
	ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);

	/* optional: */
	info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
	info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");

	if (ret) {
		pr_err("%s: error reading panel-info properties\n", __func__);
		kfree(info);
		of_node_put(info_np);
		return NULL;
	}
	of_node_put(info_np);

	return info;
}

static int panel_probe(struct platform_device *pdev)
{
	struct device_node *bl_node, *node = pdev->dev.of_node;
	struct panel_module *panel_mod;
	struct tilcdc_module *mod;
	struct pinctrl *pinctrl;
	int ret;

	/* bail out early if no DT data: */
	if (!node) {
		dev_err(&pdev->dev, "device-tree data is missing\n");
		return -ENXIO;
	}

	panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
	if (!panel_mod)
		return -ENOMEM;

	bl_node = of_parse_phandle(node, "backlight", 0);
	if (bl_node) {
		panel_mod->backlight = of_find_backlight_by_node(bl_node);
		of_node_put(bl_node);

		if (!panel_mod->backlight)
			return -EPROBE_DEFER;

		dev_info(&pdev->dev, "found backlight\n");
	}

	panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
							 GPIOD_OUT_LOW);
	if (IS_ERR(panel_mod->enable_gpio)) {
		ret = PTR_ERR(panel_mod->enable_gpio);
		dev_err(&pdev->dev, "failed to request enable GPIO\n");
		goto fail_backlight;
	}

	if (panel_mod->enable_gpio)
		dev_info(&pdev->dev, "found enable GPIO\n");

	mod = &panel_mod->base;
	pdev->dev.platform_data = mod;

	tilcdc_module_init(mod, "panel", &panel_module_ops);

	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	if (IS_ERR(pinctrl))
		dev_warn(&pdev->dev, "pins are not configured\n");

	panel_mod->timings = of_get_display_timings(node);
	if (!panel_mod->timings) {
		dev_err(&pdev->dev, "could not get panel timings\n");
		ret = -EINVAL;
		goto fail_free;
	}

	panel_mod->info = of_get_panel_info(node);
	if (!panel_mod->info) {
		dev_err(&pdev->dev, "could not get panel info\n");
		ret = -EINVAL;
		goto fail_timings;
	}

	mod->preferred_bpp = panel_mod->info->bpp;

	return 0;

fail_timings:
	display_timings_release(panel_mod->timings);

fail_free:
	tilcdc_module_cleanup(mod);

fail_backlight:
	if (panel_mod->backlight)
		put_device(&panel_mod->backlight->dev);
	return ret;
}

static int panel_remove(struct platform_device *pdev)
{
	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
	struct panel_module *panel_mod = to_panel_module(mod);
	struct backlight_device *backlight = panel_mod->backlight;

	if (backlight)
		put_device(&backlight->dev);

	display_timings_release(panel_mod->timings);

	tilcdc_module_cleanup(mod);
	kfree(panel_mod->info);

	return 0;
}

static struct of_device_id panel_of_match[] = {
		{ .compatible = "ti,tilcdc,panel", },
		{ },
};

struct platform_driver panel_driver = {
	.probe = panel_probe,
	.remove = panel_remove,
	.driver = {
		.owner = THIS_MODULE,
		.name = "panel",
		.of_match_table = panel_of_match,
	},
};

int __init tilcdc_panel_init(void)
{
	return platform_driver_register(&panel_driver);
}

void __exit tilcdc_panel_fini(void)
{
	platform_driver_unregister(&panel_driver);
}
Commit	Line	Data
0d4bbaf9 RC	1	/*
	2	* Copyright (C) 2012 Texas Instruments
	3	* Author: Rob Clark <robdclark@gmail.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 as published by
	7	* the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#include <linux/pinctrl/pinmux.h>
	19	#include <linux/pinctrl/consumer.h>
	20	#include <linux/backlight.h>
d898ce03	21	#include <linux/gpio/consumer.h>
0d4bbaf9 RC	22	#include <video/display_timing.h>
	23	#include <video/of_display_timing.h>
	24	#include <video/videomode.h>
	25
	26	#include "tilcdc_drv.h"
	27
	28	struct panel_module {
	29	struct tilcdc_module base;
	30	struct tilcdc_panel_info *info;
	31	struct display_timings *timings;
	32	struct backlight_device *backlight;
d898ce03	33	struct gpio_desc *enable_gpio;
0d4bbaf9 RC	34	};
	35	#define to_panel_module(x) container_of(x, struct panel_module, base)
	36
	37
	38	/*
	39	* Encoder:
	40	*/
	41
	42	struct panel_encoder {
	43	struct drm_encoder base;
	44	struct panel_module *mod;
	45	};
	46	#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
	47
0d4bbaf9 RC	48	static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
	49	{
	50	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	51	struct backlight_device *backlight = panel_encoder->mod->backlight;
d898ce03	52	struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
0d4bbaf9	53
d898ce03 EG	54	if (backlight) {
	55	backlight->props.power = mode == DRM_MODE_DPMS_ON ?
	56	FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
	57	backlight_update_status(backlight);
	58	}
0d4bbaf9	59
d898ce03 EG	60	if (gpio)
	61	gpiod_set_value_cansleep(gpio,
	62	mode == DRM_MODE_DPMS_ON ? 1 : 0);
0d4bbaf9 RC	63	}
0d4bbaf9 RC	64
0d4bbaf9 RC	65	static void panel_encoder_prepare(struct drm_encoder *encoder)
	66	{
	67	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	68	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
	69	tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
	70	}
	71
	72	static void panel_encoder_commit(struct drm_encoder *encoder)
	73	{
	74	panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
	75	}
	76
	77	static void panel_encoder_mode_set(struct drm_encoder *encoder,
	78	struct drm_display_mode *mode,
	79	struct drm_display_mode *adjusted_mode)
	80	{
	81	/* nothing needed */
	82	}
	83
	84	static const struct drm_encoder_funcs panel_encoder_funcs = {
d0ec32ca	85	.destroy = drm_encoder_cleanup,
0d4bbaf9 RC	86	};
	87
	88	static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
	89	.dpms = panel_encoder_dpms,
0d4bbaf9 RC	90	.prepare = panel_encoder_prepare,
	91	.commit = panel_encoder_commit,
	92	.mode_set = panel_encoder_mode_set,
	93	};
	94
	95	static struct drm_encoder panel_encoder_create(struct drm_device dev,
	96	struct panel_module *mod)
	97	{
	98	struct panel_encoder *panel_encoder;
	99	struct drm_encoder *encoder;
	100	int ret;
	101
d0ec32ca JS	102	panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
d0ec32ca JS	103	GFP_KERNEL);
0d4bbaf9 RC	104	if (!panel_encoder) {
	105	dev_err(dev->dev, "allocation failed\n");
	106	return NULL;
	107	}
	108
	109	panel_encoder->mod = mod;
	110
	111	encoder = &panel_encoder->base;
	112	encoder->possible_crtcs = 1;
	113
	114	ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
13a3d91f	115	DRM_MODE_ENCODER_LVDS, NULL);
0d4bbaf9 RC	116	if (ret < 0)
	117	goto fail;
	118
	119	drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
	120
	121	return encoder;
	122
	123	fail:
d0ec32ca	124	drm_encoder_cleanup(encoder);
0d4bbaf9 RC	125	return NULL;
	126	}
	127
	128	/*
	129	* Connector:
	130	*/
	131
	132	struct panel_connector {
	133	struct drm_connector base;
	134
	135	struct drm_encoder encoder; / our connected encoder */
	136	struct panel_module *mod;
	137	};
	138	#define to_panel_connector(x) container_of(x, struct panel_connector, base)
	139
	140
	141	static void panel_connector_destroy(struct drm_connector *connector)
	142	{
62eb3e20	143	drm_connector_unregister(connector);
0d4bbaf9	144	drm_connector_cleanup(connector);
0d4bbaf9 RC	145	}
	146
	147	static enum drm_connector_status panel_connector_detect(
	148	struct drm_connector *connector,
	149	bool force)
	150	{
	151	return connector_status_connected;
	152	}
	153
	154	static int panel_connector_get_modes(struct drm_connector *connector)
	155	{
	156	struct drm_device *dev = connector->dev;
	157	struct panel_connector *panel_connector = to_panel_connector(connector);
	158	struct display_timings *timings = panel_connector->mod->timings;
	159	int i;
	160
	161	for (i = 0; i < timings->num_timings; i++) {
	162	struct drm_display_mode *mode = drm_mode_create(dev);
	163	struct videomode vm;
	164
6cd2c7db	165	if (videomode_from_timings(timings, &vm, i))
0d4bbaf9 RC	166	break;
	167
	168	drm_display_mode_from_videomode(&vm, mode);
	169
	170	mode->type = DRM_MODE_TYPE_DRIVER;
	171
	172	if (timings->native_mode == i)
	173	mode->type \|= DRM_MODE_TYPE_PREFERRED;
	174
	175	drm_mode_set_name(mode);
	176	drm_mode_probed_add(connector, mode);
	177	}
	178
	179	return i;
	180	}
	181
	182	static int panel_connector_mode_valid(struct drm_connector *connector,
	183	struct drm_display_mode *mode)
	184	{
	185	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	186	/* our only constraints are what the crtc can generate: */
	187	return tilcdc_crtc_mode_valid(priv->crtc, mode);
	188	}
	189
	190	static struct drm_encoder *panel_connector_best_encoder(
	191	struct drm_connector *connector)
	192	{
	193	struct panel_connector *panel_connector = to_panel_connector(connector);
	194	return panel_connector->encoder;
	195	}
	196
	197	static const struct drm_connector_funcs panel_connector_funcs = {
	198	.destroy = panel_connector_destroy,
	199	.dpms = drm_helper_connector_dpms,
	200	.detect = panel_connector_detect,
	201	.fill_modes = drm_helper_probe_single_connector_modes,
	202	};
	203
	204	static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
	205	.get_modes = panel_connector_get_modes,
	206	.mode_valid = panel_connector_mode_valid,
	207	.best_encoder = panel_connector_best_encoder,
	208	};
	209
	210	static struct drm_connector panel_connector_create(struct drm_device dev,
	211	struct panel_module mod, struct drm_encoder encoder)
	212	{
	213	struct panel_connector *panel_connector;
	214	struct drm_connector *connector;
	215	int ret;
	216
d0ec32ca JS	217	panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
d0ec32ca JS	218	GFP_KERNEL);
0d4bbaf9 RC	219	if (!panel_connector) {
	220	dev_err(dev->dev, "allocation failed\n");
	221	return NULL;
	222	}
	223
	224	panel_connector->encoder = encoder;
	225	panel_connector->mod = mod;
	226
	227	connector = &panel_connector->base;
	228
	229	drm_connector_init(dev, connector, &panel_connector_funcs,
	230	DRM_MODE_CONNECTOR_LVDS);
	231	drm_connector_helper_add(connector, &panel_connector_helper_funcs);
	232
	233	connector->interlace_allowed = 0;
	234	connector->doublescan_allowed = 0;
	235
	236	ret = drm_mode_connector_attach_encoder(connector, encoder);
	237	if (ret)
	238	goto fail;
	239
34ea3d38	240	drm_connector_register(connector);
0d4bbaf9 RC	241
	242	return connector;
	243
	244	fail:
	245	panel_connector_destroy(connector);
	246	return NULL;
	247	}
	248
	249	/*
	250	* Module:
	251	*/
	252
	253	static int panel_modeset_init(struct tilcdc_module mod, struct drm_device dev)
	254	{
	255	struct panel_module *panel_mod = to_panel_module(mod);
	256	struct tilcdc_drm_private *priv = dev->dev_private;
	257	struct drm_encoder *encoder;
	258	struct drm_connector *connector;
	259
	260	encoder = panel_encoder_create(dev, panel_mod);
	261	if (!encoder)
	262	return -ENOMEM;
	263
	264	connector = panel_connector_create(dev, panel_mod, encoder);
	265	if (!connector)
	266	return -ENOMEM;
	267
	268	priv->encoders[priv->num_encoders++] = encoder;
	269	priv->connectors[priv->num_connectors++] = connector;
	270
	271	return 0;
	272	}
	273
0d4bbaf9 RC	274	static const struct tilcdc_module_ops panel_module_ops = {
0d4bbaf9 RC	275	.modeset_init = panel_modeset_init,
0d4bbaf9 RC	276	};
	277
	278	/*
	279	* Device:
	280	*/
	281
	282	/* maybe move this somewhere common if it is needed by other outputs? */
1733d010	283	static struct tilcdc_panel_info of_get_panel_info(struct device_node np)
0d4bbaf9 RC	284	{
	285	struct device_node *info_np;
	286	struct tilcdc_panel_info *info;
	287	int ret = 0;
	288
	289	if (!np) {
	290	pr_err("%s: no devicenode given\n", __func__);
	291	return NULL;
	292	}
	293
	294	info_np = of_get_child_by_name(np, "panel-info");
	295	if (!info_np) {
	296	pr_err("%s: could not find panel-info node\n", __func__);
	297	return NULL;
	298	}
	299
	300	info = kzalloc(sizeof(*info), GFP_KERNEL);
	301	if (!info) {
	302	pr_err("%s: allocation failed\n", __func__);
9430dfa6	303	of_node_put(info_np);
0d4bbaf9 RC	304	return NULL;
	305	}
	306
	307	ret \|= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
	308	ret \|= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
	309	ret \|= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
	310	ret \|= of_property_read_u32(info_np, "bpp", &info->bpp);
	311	ret \|= of_property_read_u32(info_np, "fdd", &info->fdd);
	312	ret \|= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
	313	ret \|= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
	314	ret \|= of_property_read_u32(info_np, "raster-order", &info->raster_order);
	315	ret \|= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
	316
	317	/* optional: */
	318	info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
	319	info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
	320
	321	if (ret) {
	322	pr_err("%s: error reading panel-info properties\n", __func__);
	323	kfree(info);
9430dfa6	324	of_node_put(info_np);
0d4bbaf9 RC	325	return NULL;
0d4bbaf9 RC	326	}
9430dfa6	327	of_node_put(info_np);
0d4bbaf9 RC	328
	329	return info;
	330	}
	331
0d4bbaf9 RC	332	static int panel_probe(struct platform_device *pdev)
0d4bbaf9 RC	333	{
18c44db8	334	struct device_node bl_node, node = pdev->dev.of_node;
0d4bbaf9 RC	335	struct panel_module *panel_mod;
	336	struct tilcdc_module *mod;
	337	struct pinctrl *pinctrl;
12778fc1	338	int ret;
0d4bbaf9	339
0d4bbaf9 RC	340	/* bail out early if no DT data: */
	341	if (!node) {
	342	dev_err(&pdev->dev, "device-tree data is missing\n");
	343	return -ENXIO;
	344	}
	345
971645d1	346	panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
0d4bbaf9 RC	347	if (!panel_mod)
	348	return -ENOMEM;
	349
18c44db8 EG	350	bl_node = of_parse_phandle(node, "backlight", 0);
	351	if (bl_node) {
	352	panel_mod->backlight = of_find_backlight_by_node(bl_node);
	353	of_node_put(bl_node);
	354
	355	if (!panel_mod->backlight)
	356	return -EPROBE_DEFER;
	357
	358	dev_info(&pdev->dev, "found backlight\n");
	359	}
	360
26a5bd26 UKK	361	panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
26a5bd26 UKK	362	GPIOD_OUT_LOW);
d898ce03 EG	363	if (IS_ERR(panel_mod->enable_gpio)) {
d898ce03 EG	364	ret = PTR_ERR(panel_mod->enable_gpio);
26a5bd26 UKK	365	dev_err(&pdev->dev, "failed to request enable GPIO\n");
26a5bd26 UKK	366	goto fail_backlight;
d898ce03 EG	367	}
d898ce03 EG	368
26a5bd26 UKK	369	if (panel_mod->enable_gpio)
	370	dev_info(&pdev->dev, "found enable GPIO\n");
	371
0d4bbaf9	372	mod = &panel_mod->base;
7cdcce9f	373	pdev->dev.platform_data = mod;
0d4bbaf9 RC	374
	375	tilcdc_module_init(mod, "panel", &panel_module_ops);
	376
	377	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	378	if (IS_ERR(pinctrl))
	379	dev_warn(&pdev->dev, "pins are not configured\n");
	380
0d4bbaf9 RC	381	panel_mod->timings = of_get_display_timings(node);
	382	if (!panel_mod->timings) {
	383	dev_err(&pdev->dev, "could not get panel timings\n");
12778fc1	384	ret = -EINVAL;
7cdcce9f	385	goto fail_free;
0d4bbaf9 RC	386	}
	387
	388	panel_mod->info = of_get_panel_info(node);
	389	if (!panel_mod->info) {
	390	dev_err(&pdev->dev, "could not get panel info\n");
12778fc1	391	ret = -EINVAL;
7cdcce9f	392	goto fail_timings;
0d4bbaf9 RC	393	}
0d4bbaf9 RC	394
dc28aa07 BP	395	mod->preferred_bpp = panel_mod->info->bpp;
dc28aa07 BP	396
0d4bbaf9 RC	397	return 0;
0d4bbaf9 RC	398
7cdcce9f GM	399	fail_timings:
	400	display_timings_release(panel_mod->timings);
	401
	402	fail_free:
7cdcce9f	403	tilcdc_module_cleanup(mod);
d898ce03 EG	404
d898ce03 EG	405	fail_backlight:
18c44db8 EG	406	if (panel_mod->backlight)
18c44db8 EG	407	put_device(&panel_mod->backlight->dev);
0d4bbaf9 RC	408	return ret;
	409	}
	410
	411	static int panel_remove(struct platform_device *pdev)
	412	{
7cdcce9f GM	413	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
7cdcce9f GM	414	struct panel_module *panel_mod = to_panel_module(mod);
18c44db8 EG	415	struct backlight_device *backlight = panel_mod->backlight;
	416
	417	if (backlight)
	418	put_device(&backlight->dev);
7cdcce9f GM	419
	420	display_timings_release(panel_mod->timings);
	421
	422	tilcdc_module_cleanup(mod);
	423	kfree(panel_mod->info);
7cdcce9f	424
0d4bbaf9 RC	425	return 0;
	426	}
	427
	428	static struct of_device_id panel_of_match[] = {
	429	{ .compatible = "ti,tilcdc,panel", },
	430	{ },
	431	};
0d4bbaf9 RC	432
	433	struct platform_driver panel_driver = {
	434	.probe = panel_probe,
	435	.remove = panel_remove,
	436	.driver = {
	437	.owner = THIS_MODULE,
	438	.name = "panel",
	439	.of_match_table = panel_of_match,
	440	},
	441	};
	442
	443	int __init tilcdc_panel_init(void)
	444	{
	445	return platform_driver_register(&panel_driver);
	446	}
	447
	448	void __exit tilcdc_panel_fini(void)
	449	{
	450	platform_driver_unregister(&panel_driver);
	451	}