[mirror_ubuntu-bionic-kernel.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 <drm/drm_atomic_helper.h>

#include "tilcdc_drv.h"
#include "tilcdc_panel.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)
{
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}

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 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,
	.fill_modes         = drm_helper_probe_single_connector_modes,
	.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 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;

	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;

	tilcdc_crtc_set_panel_info(priv->crtc,
				   to_panel_encoder(encoder)->mod->info);

	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;
	}

	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>
0f65d89b	25	#include <drm/drm_atomic_helper.h>
0d4bbaf9 RC	26
0d4bbaf9 RC	27	#include "tilcdc_drv.h"
0fd86779	28	#include "tilcdc_panel.h"
0d4bbaf9 RC	29
	30	struct panel_module {
	31	struct tilcdc_module base;
	32	struct tilcdc_panel_info *info;
	33	struct display_timings *timings;
	34	struct backlight_device *backlight;
d898ce03	35	struct gpio_desc *enable_gpio;
0d4bbaf9 RC	36	};
	37	#define to_panel_module(x) container_of(x, struct panel_module, base)
	38
	39
	40	/*
	41	* Encoder:
	42	*/
	43
	44	struct panel_encoder {
	45	struct drm_encoder base;
	46	struct panel_module *mod;
	47	};
	48	#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
	49
0d4bbaf9 RC	50	static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
	51	{
	52	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	53	struct backlight_device *backlight = panel_encoder->mod->backlight;
d898ce03	54	struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
0d4bbaf9	55
d898ce03 EG	56	if (backlight) {
	57	backlight->props.power = mode == DRM_MODE_DPMS_ON ?
	58	FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
	59	backlight_update_status(backlight);
	60	}
0d4bbaf9	61
d898ce03 EG	62	if (gpio)
	63	gpiod_set_value_cansleep(gpio,
	64	mode == DRM_MODE_DPMS_ON ? 1 : 0);
0d4bbaf9 RC	65	}
0d4bbaf9 RC	66
0d4bbaf9 RC	67	static void panel_encoder_prepare(struct drm_encoder *encoder)
0d4bbaf9 RC	68	{
0d4bbaf9	69	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
0d4bbaf9 RC	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	}
0d4bbaf9 RC	146
0d4bbaf9 RC	147	static int panel_connector_get_modes(struct drm_connector *connector)
	148	{
	149	struct drm_device *dev = connector->dev;
	150	struct panel_connector *panel_connector = to_panel_connector(connector);
	151	struct display_timings *timings = panel_connector->mod->timings;
	152	int i;
	153
	154	for (i = 0; i < timings->num_timings; i++) {
	155	struct drm_display_mode *mode = drm_mode_create(dev);
	156	struct videomode vm;
	157
6cd2c7db	158	if (videomode_from_timings(timings, &vm, i))
0d4bbaf9 RC	159	break;
	160
	161	drm_display_mode_from_videomode(&vm, mode);
	162
	163	mode->type = DRM_MODE_TYPE_DRIVER;
	164
	165	if (timings->native_mode == i)
	166	mode->type \|= DRM_MODE_TYPE_PREFERRED;
	167
	168	drm_mode_set_name(mode);
	169	drm_mode_probed_add(connector, mode);
	170	}
	171
	172	return i;
	173	}
	174
	175	static int panel_connector_mode_valid(struct drm_connector *connector,
	176	struct drm_display_mode *mode)
	177	{
	178	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	179	/* our only constraints are what the crtc can generate: */
	180	return tilcdc_crtc_mode_valid(priv->crtc, mode);
	181	}
	182
	183	static struct drm_encoder *panel_connector_best_encoder(
	184	struct drm_connector *connector)
	185	{
	186	struct panel_connector *panel_connector = to_panel_connector(connector);
	187	return panel_connector->encoder;
	188	}
	189
	190	static const struct drm_connector_funcs panel_connector_funcs = {
	191	.destroy = panel_connector_destroy,
0d4bbaf9	192	.fill_modes = drm_helper_probe_single_connector_modes,
0f65d89b JS	193	.reset = drm_atomic_helper_connector_reset,
	194	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	195	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0d4bbaf9 RC	196	};
	197
	198	static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
	199	.get_modes = panel_connector_get_modes,
	200	.mode_valid = panel_connector_mode_valid,
	201	.best_encoder = panel_connector_best_encoder,
	202	};
	203
	204	static struct drm_connector panel_connector_create(struct drm_device dev,
	205	struct panel_module mod, struct drm_encoder encoder)
	206	{
	207	struct panel_connector *panel_connector;
	208	struct drm_connector *connector;
	209	int ret;
	210
d0ec32ca JS	211	panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
d0ec32ca JS	212	GFP_KERNEL);
0d4bbaf9 RC	213	if (!panel_connector) {
	214	dev_err(dev->dev, "allocation failed\n");
	215	return NULL;
	216	}
	217
	218	panel_connector->encoder = encoder;
	219	panel_connector->mod = mod;
	220
	221	connector = &panel_connector->base;
	222
	223	drm_connector_init(dev, connector, &panel_connector_funcs,
	224	DRM_MODE_CONNECTOR_LVDS);
	225	drm_connector_helper_add(connector, &panel_connector_helper_funcs);
	226
	227	connector->interlace_allowed = 0;
	228	connector->doublescan_allowed = 0;
	229
	230	ret = drm_mode_connector_attach_encoder(connector, encoder);
	231	if (ret)
	232	goto fail;
	233
0d4bbaf9 RC	234	return connector;
	235
	236	fail:
	237	panel_connector_destroy(connector);
	238	return NULL;
	239	}
	240
	241	/*
	242	* Module:
	243	*/
	244
	245	static int panel_modeset_init(struct tilcdc_module mod, struct drm_device dev)
	246	{
	247	struct panel_module *panel_mod = to_panel_module(mod);
	248	struct tilcdc_drm_private *priv = dev->dev_private;
	249	struct drm_encoder *encoder;
	250	struct drm_connector *connector;
	251
	252	encoder = panel_encoder_create(dev, panel_mod);
	253	if (!encoder)
	254	return -ENOMEM;
	255
	256	connector = panel_connector_create(dev, panel_mod, encoder);
	257	if (!connector)
	258	return -ENOMEM;
	259
	260	priv->encoders[priv->num_encoders++] = encoder;
	261	priv->connectors[priv->num_connectors++] = connector;
	262
ee6de21b JS	263	tilcdc_crtc_set_panel_info(priv->crtc,
	264	to_panel_encoder(encoder)->mod->info);
	265
0d4bbaf9 RC	266	return 0;
	267	}
	268
0d4bbaf9 RC	269	static const struct tilcdc_module_ops panel_module_ops = {
0d4bbaf9 RC	270	.modeset_init = panel_modeset_init,
0d4bbaf9 RC	271	};
	272
	273	/*
	274	* Device:
	275	*/
	276
	277	/* maybe move this somewhere common if it is needed by other outputs? */
1733d010	278	static struct tilcdc_panel_info of_get_panel_info(struct device_node np)
0d4bbaf9 RC	279	{
	280	struct device_node *info_np;
	281	struct tilcdc_panel_info *info;
	282	int ret = 0;
	283
	284	if (!np) {
	285	pr_err("%s: no devicenode given\n", __func__);
	286	return NULL;
	287	}
	288
	289	info_np = of_get_child_by_name(np, "panel-info");
	290	if (!info_np) {
	291	pr_err("%s: could not find panel-info node\n", __func__);
	292	return NULL;
	293	}
	294
	295	info = kzalloc(sizeof(*info), GFP_KERNEL);
	296	if (!info) {
	297	pr_err("%s: allocation failed\n", __func__);
9430dfa6	298	of_node_put(info_np);
0d4bbaf9 RC	299	return NULL;
	300	}
	301
	302	ret \|= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
	303	ret \|= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
	304	ret \|= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
	305	ret \|= of_property_read_u32(info_np, "bpp", &info->bpp);
	306	ret \|= of_property_read_u32(info_np, "fdd", &info->fdd);
	307	ret \|= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
	308	ret \|= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
	309	ret \|= of_property_read_u32(info_np, "raster-order", &info->raster_order);
	310	ret \|= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
	311
	312	/* optional: */
	313	info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
	314	info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
	315
	316	if (ret) {
	317	pr_err("%s: error reading panel-info properties\n", __func__);
	318	kfree(info);
9430dfa6	319	of_node_put(info_np);
0d4bbaf9 RC	320	return NULL;
0d4bbaf9 RC	321	}
9430dfa6	322	of_node_put(info_np);
0d4bbaf9 RC	323
	324	return info;
	325	}
	326
0d4bbaf9 RC	327	static int panel_probe(struct platform_device *pdev)
0d4bbaf9 RC	328	{
18c44db8	329	struct device_node bl_node, node = pdev->dev.of_node;
0d4bbaf9 RC	330	struct panel_module *panel_mod;
	331	struct tilcdc_module *mod;
	332	struct pinctrl *pinctrl;
12778fc1	333	int ret;
0d4bbaf9	334
0d4bbaf9 RC	335	/* bail out early if no DT data: */
	336	if (!node) {
	337	dev_err(&pdev->dev, "device-tree data is missing\n");
	338	return -ENXIO;
	339	}
	340
971645d1	341	panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
0d4bbaf9 RC	342	if (!panel_mod)
	343	return -ENOMEM;
	344
18c44db8 EG	345	bl_node = of_parse_phandle(node, "backlight", 0);
	346	if (bl_node) {
	347	panel_mod->backlight = of_find_backlight_by_node(bl_node);
	348	of_node_put(bl_node);
	349
	350	if (!panel_mod->backlight)
	351	return -EPROBE_DEFER;
	352
	353	dev_info(&pdev->dev, "found backlight\n");
	354	}
	355
26a5bd26 UKK	356	panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
26a5bd26 UKK	357	GPIOD_OUT_LOW);
d898ce03 EG	358	if (IS_ERR(panel_mod->enable_gpio)) {
d898ce03 EG	359	ret = PTR_ERR(panel_mod->enable_gpio);
26a5bd26 UKK	360	dev_err(&pdev->dev, "failed to request enable GPIO\n");
26a5bd26 UKK	361	goto fail_backlight;
d898ce03 EG	362	}
d898ce03 EG	363
26a5bd26 UKK	364	if (panel_mod->enable_gpio)
	365	dev_info(&pdev->dev, "found enable GPIO\n");
	366
0d4bbaf9	367	mod = &panel_mod->base;
7cdcce9f	368	pdev->dev.platform_data = mod;
0d4bbaf9 RC	369
	370	tilcdc_module_init(mod, "panel", &panel_module_ops);
	371
	372	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	373	if (IS_ERR(pinctrl))
	374	dev_warn(&pdev->dev, "pins are not configured\n");
	375
0d4bbaf9 RC	376	panel_mod->timings = of_get_display_timings(node);
	377	if (!panel_mod->timings) {
	378	dev_err(&pdev->dev, "could not get panel timings\n");
12778fc1	379	ret = -EINVAL;
7cdcce9f	380	goto fail_free;
0d4bbaf9 RC	381	}
	382
	383	panel_mod->info = of_get_panel_info(node);
	384	if (!panel_mod->info) {
	385	dev_err(&pdev->dev, "could not get panel info\n");
12778fc1	386	ret = -EINVAL;
7cdcce9f	387	goto fail_timings;
0d4bbaf9 RC	388	}
0d4bbaf9 RC	389
0d4bbaf9 RC	390	return 0;
0d4bbaf9 RC	391
7cdcce9f GM	392	fail_timings:
	393	display_timings_release(panel_mod->timings);
	394
	395	fail_free:
7cdcce9f	396	tilcdc_module_cleanup(mod);
d898ce03 EG	397
d898ce03 EG	398	fail_backlight:
18c44db8 EG	399	if (panel_mod->backlight)
18c44db8 EG	400	put_device(&panel_mod->backlight->dev);
0d4bbaf9 RC	401	return ret;
	402	}
	403
	404	static int panel_remove(struct platform_device *pdev)
	405	{
7cdcce9f GM	406	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
7cdcce9f GM	407	struct panel_module *panel_mod = to_panel_module(mod);
18c44db8 EG	408	struct backlight_device *backlight = panel_mod->backlight;
	409
	410	if (backlight)
	411	put_device(&backlight->dev);
7cdcce9f GM	412
	413	display_timings_release(panel_mod->timings);
	414
	415	tilcdc_module_cleanup(mod);
	416	kfree(panel_mod->info);
7cdcce9f	417
0d4bbaf9 RC	418	return 0;
	419	}
	420
	421	static struct of_device_id panel_of_match[] = {
	422	{ .compatible = "ti,tilcdc,panel", },
	423	{ },
	424	};
0d4bbaf9 RC	425
	426	struct platform_driver panel_driver = {
	427	.probe = panel_probe,
	428	.remove = panel_remove,
	429	.driver = {
	430	.owner = THIS_MODULE,
	431	.name = "panel",
	432	.of_match_table = panel_of_match,
	433	},
	434	};
	435
	436	int __init tilcdc_panel_init(void)
	437	{
	438	return platform_driver_register(&panel_driver);
	439	}
	440
	441	void __exit tilcdc_panel_fini(void)
	442	{
	443	platform_driver_unregister(&panel_driver);
	444	}