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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Texas Instruments
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include <linux/gpio/consumer.h>
8#include <linux/pinctrl/consumer.h>
9#include <linux/platform_device.h>
10
11#include <video/display_timing.h>
12#include <video/of_display_timing.h>
13#include <video/videomode.h>
14
15#include <drm/drm_atomic_state_helper.h>
16#include <drm/drm_connector.h>
17#include <drm/drm_modeset_helper_vtables.h>
18#include <drm/drm_probe_helper.h>
19#include <drm/drm_simple_kms_helper.h>
20
21#include "tilcdc_drv.h"
22#include "tilcdc_panel.h"
23
24struct panel_module {
25 struct tilcdc_module base;
26 struct tilcdc_panel_info *info;
27 struct display_timings *timings;
28 struct backlight_device *backlight;
29 struct gpio_desc *enable_gpio;
30};
31#define to_panel_module(x) container_of(x, struct panel_module, base)
32
33
34/*
35 * Encoder:
36 */
37
38struct panel_encoder {
39 struct drm_encoder base;
40 struct panel_module *mod;
41};
42#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
43
44static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
45{
46 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
47 struct backlight_device *backlight = panel_encoder->mod->backlight;
48 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
49
50 if (backlight) {
51 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
52 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
53 backlight_update_status(backlight);
54 }
55
56 if (gpio)
57 gpiod_set_value_cansleep(gpio,
58 mode == DRM_MODE_DPMS_ON ? 1 : 0);
59}
60
61static void panel_encoder_prepare(struct drm_encoder *encoder)
62{
63 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
64}
65
66static void panel_encoder_commit(struct drm_encoder *encoder)
67{
68 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
69}
70
71static void panel_encoder_mode_set(struct drm_encoder *encoder,
72 struct drm_display_mode *mode,
73 struct drm_display_mode *adjusted_mode)
74{
75 /* nothing needed */
76}
77
78static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
79 .dpms = panel_encoder_dpms,
80 .prepare = panel_encoder_prepare,
81 .commit = panel_encoder_commit,
82 .mode_set = panel_encoder_mode_set,
83};
84
85static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
86 struct panel_module *mod)
87{
88 struct panel_encoder *panel_encoder;
89 struct drm_encoder *encoder;
90 int ret;
91
92 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
93 GFP_KERNEL);
94 if (!panel_encoder)
95 return NULL;
96
97 panel_encoder->mod = mod;
98
99 encoder = &panel_encoder->base;
100 encoder->possible_crtcs = 1;
101
102 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
103 if (ret < 0)
104 goto fail;
105
106 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
107
108 return encoder;
109
110fail:
111 drm_encoder_cleanup(encoder);
112 return NULL;
113}
114
115/*
116 * Connector:
117 */
118
119struct panel_connector {
120 struct drm_connector base;
121
122 struct drm_encoder *encoder; /* our connected encoder */
123 struct panel_module *mod;
124};
125#define to_panel_connector(x) container_of(x, struct panel_connector, base)
126
127
128static void panel_connector_destroy(struct drm_connector *connector)
129{
130 drm_connector_unregister(connector);
131 drm_connector_cleanup(connector);
132}
133
134static int panel_connector_get_modes(struct drm_connector *connector)
135{
136 struct drm_device *dev = connector->dev;
137 struct panel_connector *panel_connector = to_panel_connector(connector);
138 struct display_timings *timings = panel_connector->mod->timings;
139 int i;
140
141 for (i = 0; i < timings->num_timings; i++) {
142 struct drm_display_mode *mode;
143 struct videomode vm;
144
145 if (videomode_from_timings(timings, &vm, i))
146 break;
147
148 mode = drm_mode_create(dev);
149 if (!mode)
150 break;
151
152 drm_display_mode_from_videomode(&vm, mode);
153
154 mode->type = DRM_MODE_TYPE_DRIVER;
155
156 if (timings->native_mode == i)
157 mode->type |= DRM_MODE_TYPE_PREFERRED;
158
159 drm_mode_set_name(mode);
160 drm_mode_probed_add(connector, mode);
161 }
162
163 return i;
164}
165
166static struct drm_encoder *panel_connector_best_encoder(
167 struct drm_connector *connector)
168{
169 struct panel_connector *panel_connector = to_panel_connector(connector);
170 return panel_connector->encoder;
171}
172
173static const struct drm_connector_funcs panel_connector_funcs = {
174 .destroy = panel_connector_destroy,
175 .fill_modes = drm_helper_probe_single_connector_modes,
176 .reset = drm_atomic_helper_connector_reset,
177 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
178 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
179};
180
181static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
182 .get_modes = panel_connector_get_modes,
183 .best_encoder = panel_connector_best_encoder,
184};
185
186static struct drm_connector *panel_connector_create(struct drm_device *dev,
187 struct panel_module *mod, struct drm_encoder *encoder)
188{
189 struct panel_connector *panel_connector;
190 struct drm_connector *connector;
191 int ret;
192
193 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
194 GFP_KERNEL);
195 if (!panel_connector)
196 return NULL;
197
198 panel_connector->encoder = encoder;
199 panel_connector->mod = mod;
200
201 connector = &panel_connector->base;
202
203 drm_connector_init(dev, connector, &panel_connector_funcs,
204 DRM_MODE_CONNECTOR_LVDS);
205 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
206
207 connector->interlace_allowed = 0;
208 connector->doublescan_allowed = 0;
209
210 ret = drm_connector_attach_encoder(connector, encoder);
211 if (ret)
212 goto fail;
213
214 return connector;
215
216fail:
217 panel_connector_destroy(connector);
218 return NULL;
219}
220
221/*
222 * Module:
223 */
224
225static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
226{
227 struct panel_module *panel_mod = to_panel_module(mod);
228 struct tilcdc_drm_private *priv = dev->dev_private;
229 struct drm_encoder *encoder;
230 struct drm_connector *connector;
231
232 encoder = panel_encoder_create(dev, panel_mod);
233 if (!encoder)
234 return -ENOMEM;
235
236 connector = panel_connector_create(dev, panel_mod, encoder);
237 if (!connector)
238 return -ENOMEM;
239
240 priv->encoders[priv->num_encoders++] = encoder;
241 priv->connectors[priv->num_connectors++] = connector;
242
243 tilcdc_crtc_set_panel_info(priv->crtc,
244 to_panel_encoder(encoder)->mod->info);
245
246 return 0;
247}
248
249static const struct tilcdc_module_ops panel_module_ops = {
250 .modeset_init = panel_modeset_init,
251};
252
253/*
254 * Device:
255 */
256
257/* maybe move this somewhere common if it is needed by other outputs? */
258static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
259{
260 struct device_node *info_np;
261 struct tilcdc_panel_info *info;
262 int ret = 0;
263
264 if (!np) {
265 pr_err("%s: no devicenode given\n", __func__);
266 return NULL;
267 }
268
269 info_np = of_get_child_by_name(np, "panel-info");
270 if (!info_np) {
271 pr_err("%s: could not find panel-info node\n", __func__);
272 return NULL;
273 }
274
275 info = kzalloc(sizeof(*info), GFP_KERNEL);
276 if (!info)
277 goto put_node;
278
279 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
280 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
281 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
282 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
283 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
284 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
285 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
286 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
287 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
288
289 /* optional: */
290 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
291 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
292
293 if (ret) {
294 pr_err("%s: error reading panel-info properties\n", __func__);
295 kfree(info);
296 info = NULL;
297 }
298
299put_node:
300 of_node_put(info_np);
301 return info;
302}
303
304static int panel_probe(struct platform_device *pdev)
305{
306 struct device_node *node = pdev->dev.of_node;
307 struct backlight_device *backlight;
308 struct panel_module *panel_mod;
309 struct tilcdc_module *mod;
310 struct pinctrl *pinctrl;
311 int ret;
312
313 /* bail out early if no DT data: */
314 if (!node) {
315 dev_err(&pdev->dev, "device-tree data is missing\n");
316 return -ENXIO;
317 }
318
319 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
320 if (!panel_mod)
321 return -ENOMEM;
322
323 backlight = devm_of_find_backlight(&pdev->dev);
324 if (IS_ERR(backlight))
325 return PTR_ERR(backlight);
326 panel_mod->backlight = backlight;
327
328 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
329 GPIOD_OUT_LOW);
330 if (IS_ERR(panel_mod->enable_gpio)) {
331 ret = PTR_ERR(panel_mod->enable_gpio);
332 dev_err(&pdev->dev, "failed to request enable GPIO\n");
333 goto fail_backlight;
334 }
335
336 if (panel_mod->enable_gpio)
337 dev_info(&pdev->dev, "found enable GPIO\n");
338
339 mod = &panel_mod->base;
340 pdev->dev.platform_data = mod;
341
342 tilcdc_module_init(mod, "panel", &panel_module_ops);
343
344 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
345 if (IS_ERR(pinctrl))
346 dev_warn(&pdev->dev, "pins are not configured\n");
347
348 panel_mod->timings = of_get_display_timings(node);
349 if (!panel_mod->timings) {
350 dev_err(&pdev->dev, "could not get panel timings\n");
351 ret = -EINVAL;
352 goto fail_free;
353 }
354
355 panel_mod->info = of_get_panel_info(node);
356 if (!panel_mod->info) {
357 dev_err(&pdev->dev, "could not get panel info\n");
358 ret = -EINVAL;
359 goto fail_timings;
360 }
361
362 return 0;
363
364fail_timings:
365 display_timings_release(panel_mod->timings);
366
367fail_free:
368 tilcdc_module_cleanup(mod);
369
370fail_backlight:
371 if (panel_mod->backlight)
372 put_device(&panel_mod->backlight->dev);
373 return ret;
374}
375
376static int panel_remove(struct platform_device *pdev)
377{
378 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
379 struct panel_module *panel_mod = to_panel_module(mod);
380 struct backlight_device *backlight = panel_mod->backlight;
381
382 if (backlight)
383 put_device(&backlight->dev);
384
385 display_timings_release(panel_mod->timings);
386
387 tilcdc_module_cleanup(mod);
388 kfree(panel_mod->info);
389
390 return 0;
391}
392
393static const struct of_device_id panel_of_match[] = {
394 { .compatible = "ti,tilcdc,panel", },
395 { },
396};
397
398static struct platform_driver panel_driver = {
399 .probe = panel_probe,
400 .remove = panel_remove,
401 .driver = {
402 .owner = THIS_MODULE,
403 .name = "tilcdc-panel",
404 .of_match_table = panel_of_match,
405 },
406};
407
408int __init tilcdc_panel_init(void)
409{
410 return platform_driver_register(&panel_driver);
411}
412
413void __exit tilcdc_panel_fini(void)
414{
415 platform_driver_unregister(&panel_driver);
416}
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>
21#include <video/display_timing.h>
22#include <video/of_display_timing.h>
23#include <video/videomode.h>
24
25#include "tilcdc_drv.h"
26
27struct panel_module {
28 struct tilcdc_module base;
29 struct tilcdc_panel_info *info;
30 struct display_timings *timings;
31 struct backlight_device *backlight;
32};
33#define to_panel_module(x) container_of(x, struct panel_module, base)
34
35
36/*
37 * Encoder:
38 */
39
40struct panel_encoder {
41 struct drm_encoder base;
42 struct panel_module *mod;
43};
44#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
45
46
47static void panel_encoder_destroy(struct drm_encoder *encoder)
48{
49 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
50 drm_encoder_cleanup(encoder);
51 kfree(panel_encoder);
52}
53
54static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
55{
56 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
57 struct backlight_device *backlight = panel_encoder->mod->backlight;
58
59 if (!backlight)
60 return;
61
62 backlight->props.power = mode == DRM_MODE_DPMS_ON
63 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
64 backlight_update_status(backlight);
65}
66
67static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
68 const struct drm_display_mode *mode,
69 struct drm_display_mode *adjusted_mode)
70{
71 /* nothing needed */
72 return true;
73}
74
75static void panel_encoder_prepare(struct drm_encoder *encoder)
76{
77 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
78 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
79 tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
80}
81
82static void panel_encoder_commit(struct drm_encoder *encoder)
83{
84 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
85}
86
87static void panel_encoder_mode_set(struct drm_encoder *encoder,
88 struct drm_display_mode *mode,
89 struct drm_display_mode *adjusted_mode)
90{
91 /* nothing needed */
92}
93
94static const struct drm_encoder_funcs panel_encoder_funcs = {
95 .destroy = panel_encoder_destroy,
96};
97
98static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
99 .dpms = panel_encoder_dpms,
100 .mode_fixup = panel_encoder_mode_fixup,
101 .prepare = panel_encoder_prepare,
102 .commit = panel_encoder_commit,
103 .mode_set = panel_encoder_mode_set,
104};
105
106static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
107 struct panel_module *mod)
108{
109 struct panel_encoder *panel_encoder;
110 struct drm_encoder *encoder;
111 int ret;
112
113 panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
114 if (!panel_encoder) {
115 dev_err(dev->dev, "allocation failed\n");
116 return NULL;
117 }
118
119 panel_encoder->mod = mod;
120
121 encoder = &panel_encoder->base;
122 encoder->possible_crtcs = 1;
123
124 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
125 DRM_MODE_ENCODER_LVDS);
126 if (ret < 0)
127 goto fail;
128
129 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
130
131 return encoder;
132
133fail:
134 panel_encoder_destroy(encoder);
135 return NULL;
136}
137
138/*
139 * Connector:
140 */
141
142struct panel_connector {
143 struct drm_connector base;
144
145 struct drm_encoder *encoder; /* our connected encoder */
146 struct panel_module *mod;
147};
148#define to_panel_connector(x) container_of(x, struct panel_connector, base)
149
150
151static void panel_connector_destroy(struct drm_connector *connector)
152{
153 struct panel_connector *panel_connector = to_panel_connector(connector);
154 drm_connector_cleanup(connector);
155 kfree(panel_connector);
156}
157
158static enum drm_connector_status panel_connector_detect(
159 struct drm_connector *connector,
160 bool force)
161{
162 return connector_status_connected;
163}
164
165static int panel_connector_get_modes(struct drm_connector *connector)
166{
167 struct drm_device *dev = connector->dev;
168 struct panel_connector *panel_connector = to_panel_connector(connector);
169 struct display_timings *timings = panel_connector->mod->timings;
170 int i;
171
172 for (i = 0; i < timings->num_timings; i++) {
173 struct drm_display_mode *mode = drm_mode_create(dev);
174 struct videomode vm;
175
176 if (videomode_from_timings(timings, &vm, i))
177 break;
178
179 drm_display_mode_from_videomode(&vm, mode);
180
181 mode->type = DRM_MODE_TYPE_DRIVER;
182
183 if (timings->native_mode == i)
184 mode->type |= DRM_MODE_TYPE_PREFERRED;
185
186 drm_mode_set_name(mode);
187 drm_mode_probed_add(connector, mode);
188 }
189
190 return i;
191}
192
193static int panel_connector_mode_valid(struct drm_connector *connector,
194 struct drm_display_mode *mode)
195{
196 struct tilcdc_drm_private *priv = connector->dev->dev_private;
197 /* our only constraints are what the crtc can generate: */
198 return tilcdc_crtc_mode_valid(priv->crtc, mode);
199}
200
201static struct drm_encoder *panel_connector_best_encoder(
202 struct drm_connector *connector)
203{
204 struct panel_connector *panel_connector = to_panel_connector(connector);
205 return panel_connector->encoder;
206}
207
208static const struct drm_connector_funcs panel_connector_funcs = {
209 .destroy = panel_connector_destroy,
210 .dpms = drm_helper_connector_dpms,
211 .detect = panel_connector_detect,
212 .fill_modes = drm_helper_probe_single_connector_modes,
213};
214
215static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
216 .get_modes = panel_connector_get_modes,
217 .mode_valid = panel_connector_mode_valid,
218 .best_encoder = panel_connector_best_encoder,
219};
220
221static struct drm_connector *panel_connector_create(struct drm_device *dev,
222 struct panel_module *mod, struct drm_encoder *encoder)
223{
224 struct panel_connector *panel_connector;
225 struct drm_connector *connector;
226 int ret;
227
228 panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
229 if (!panel_connector) {
230 dev_err(dev->dev, "allocation failed\n");
231 return NULL;
232 }
233
234 panel_connector->encoder = encoder;
235 panel_connector->mod = mod;
236
237 connector = &panel_connector->base;
238
239 drm_connector_init(dev, connector, &panel_connector_funcs,
240 DRM_MODE_CONNECTOR_LVDS);
241 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
242
243 connector->interlace_allowed = 0;
244 connector->doublescan_allowed = 0;
245
246 ret = drm_mode_connector_attach_encoder(connector, encoder);
247 if (ret)
248 goto fail;
249
250 drm_sysfs_connector_add(connector);
251
252 return connector;
253
254fail:
255 panel_connector_destroy(connector);
256 return NULL;
257}
258
259/*
260 * Module:
261 */
262
263static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
264{
265 struct panel_module *panel_mod = to_panel_module(mod);
266 struct tilcdc_drm_private *priv = dev->dev_private;
267 struct drm_encoder *encoder;
268 struct drm_connector *connector;
269
270 encoder = panel_encoder_create(dev, panel_mod);
271 if (!encoder)
272 return -ENOMEM;
273
274 connector = panel_connector_create(dev, panel_mod, encoder);
275 if (!connector)
276 return -ENOMEM;
277
278 priv->encoders[priv->num_encoders++] = encoder;
279 priv->connectors[priv->num_connectors++] = connector;
280
281 return 0;
282}
283
284static void panel_destroy(struct tilcdc_module *mod)
285{
286 struct panel_module *panel_mod = to_panel_module(mod);
287
288 if (panel_mod->timings) {
289 display_timings_release(panel_mod->timings);
290 kfree(panel_mod->timings);
291 }
292
293 tilcdc_module_cleanup(mod);
294 kfree(panel_mod->info);
295 kfree(panel_mod);
296}
297
298static const struct tilcdc_module_ops panel_module_ops = {
299 .modeset_init = panel_modeset_init,
300 .destroy = panel_destroy,
301};
302
303/*
304 * Device:
305 */
306
307/* maybe move this somewhere common if it is needed by other outputs? */
308static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
309{
310 struct device_node *info_np;
311 struct tilcdc_panel_info *info;
312 int ret = 0;
313
314 if (!np) {
315 pr_err("%s: no devicenode given\n", __func__);
316 return NULL;
317 }
318
319 info_np = of_get_child_by_name(np, "panel-info");
320 if (!info_np) {
321 pr_err("%s: could not find panel-info node\n", __func__);
322 return NULL;
323 }
324
325 info = kzalloc(sizeof(*info), GFP_KERNEL);
326 if (!info) {
327 pr_err("%s: allocation failed\n", __func__);
328 return NULL;
329 }
330
331 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
332 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
333 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
334 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
335 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
336 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
337 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
338 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
339 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
340
341 /* optional: */
342 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
343 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
344
345 if (ret) {
346 pr_err("%s: error reading panel-info properties\n", __func__);
347 kfree(info);
348 return NULL;
349 }
350
351 return info;
352}
353
354static struct of_device_id panel_of_match[];
355
356static int panel_probe(struct platform_device *pdev)
357{
358 struct device_node *node = pdev->dev.of_node;
359 struct panel_module *panel_mod;
360 struct tilcdc_module *mod;
361 struct pinctrl *pinctrl;
362 int ret = -EINVAL;
363
364
365 /* bail out early if no DT data: */
366 if (!node) {
367 dev_err(&pdev->dev, "device-tree data is missing\n");
368 return -ENXIO;
369 }
370
371 panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL);
372 if (!panel_mod)
373 return -ENOMEM;
374
375 mod = &panel_mod->base;
376
377 tilcdc_module_init(mod, "panel", &panel_module_ops);
378
379 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
380 if (IS_ERR(pinctrl))
381 dev_warn(&pdev->dev, "pins are not configured\n");
382
383
384 panel_mod->timings = of_get_display_timings(node);
385 if (!panel_mod->timings) {
386 dev_err(&pdev->dev, "could not get panel timings\n");
387 goto fail;
388 }
389
390 panel_mod->info = of_get_panel_info(node);
391 if (!panel_mod->info) {
392 dev_err(&pdev->dev, "could not get panel info\n");
393 goto fail;
394 }
395
396 mod->preferred_bpp = panel_mod->info->bpp;
397
398 panel_mod->backlight = of_find_backlight_by_node(node);
399 if (panel_mod->backlight)
400 dev_info(&pdev->dev, "found backlight\n");
401
402 return 0;
403
404fail:
405 panel_destroy(mod);
406 return ret;
407}
408
409static int panel_remove(struct platform_device *pdev)
410{
411 return 0;
412}
413
414static struct of_device_id panel_of_match[] = {
415 { .compatible = "ti,tilcdc,panel", },
416 { },
417};
418
419struct platform_driver panel_driver = {
420 .probe = panel_probe,
421 .remove = panel_remove,
422 .driver = {
423 .owner = THIS_MODULE,
424 .name = "panel",
425 .of_match_table = panel_of_match,
426 },
427};
428
429int __init tilcdc_panel_init(void)
430{
431 return platform_driver_register(&panel_driver);
432}
433
434void __exit tilcdc_panel_fini(void)
435{
436 platform_driver_unregister(&panel_driver);
437}