Loading...
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 <linux/gpio/consumer.h>
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
28struct panel_module {
29 struct tilcdc_module base;
30 struct tilcdc_panel_info *info;
31 struct display_timings *timings;
32 struct backlight_device *backlight;
33 struct gpio_desc *enable_gpio;
34};
35#define to_panel_module(x) container_of(x, struct panel_module, base)
36
37
38/*
39 * Encoder:
40 */
41
42struct 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
48static 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;
52 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
53
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 }
59
60 if (gpio)
61 gpiod_set_value_cansleep(gpio,
62 mode == DRM_MODE_DPMS_ON ? 1 : 0);
63}
64
65static 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
72static void panel_encoder_commit(struct drm_encoder *encoder)
73{
74 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
75}
76
77static 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
84static const struct drm_encoder_funcs panel_encoder_funcs = {
85 .destroy = drm_encoder_cleanup,
86};
87
88static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
89 .dpms = panel_encoder_dpms,
90 .prepare = panel_encoder_prepare,
91 .commit = panel_encoder_commit,
92 .mode_set = panel_encoder_mode_set,
93};
94
95static 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
102 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
103 GFP_KERNEL);
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,
115 DRM_MODE_ENCODER_LVDS, NULL);
116 if (ret < 0)
117 goto fail;
118
119 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
120
121 return encoder;
122
123fail:
124 drm_encoder_cleanup(encoder);
125 return NULL;
126}
127
128/*
129 * Connector:
130 */
131
132struct 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
141static void panel_connector_destroy(struct drm_connector *connector)
142{
143 drm_connector_unregister(connector);
144 drm_connector_cleanup(connector);
145}
146
147static enum drm_connector_status panel_connector_detect(
148 struct drm_connector *connector,
149 bool force)
150{
151 return connector_status_connected;
152}
153
154static 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
165 if (videomode_from_timings(timings, &vm, i))
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
182static 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
190static 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
197static 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
204static 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
210static 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
217 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
218 GFP_KERNEL);
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
240 drm_connector_register(connector);
241
242 return connector;
243
244fail:
245 panel_connector_destroy(connector);
246 return NULL;
247}
248
249/*
250 * Module:
251 */
252
253static 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
274static const struct tilcdc_module_ops panel_module_ops = {
275 .modeset_init = panel_modeset_init,
276};
277
278/*
279 * Device:
280 */
281
282/* maybe move this somewhere common if it is needed by other outputs? */
283static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
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__);
303 of_node_put(info_np);
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);
324 of_node_put(info_np);
325 return NULL;
326 }
327 of_node_put(info_np);
328
329 return info;
330}
331
332static int panel_probe(struct platform_device *pdev)
333{
334 struct device_node *bl_node, *node = pdev->dev.of_node;
335 struct panel_module *panel_mod;
336 struct tilcdc_module *mod;
337 struct pinctrl *pinctrl;
338 int ret;
339
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
346 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
347 if (!panel_mod)
348 return -ENOMEM;
349
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
361 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
362 GPIOD_OUT_LOW);
363 if (IS_ERR(panel_mod->enable_gpio)) {
364 ret = PTR_ERR(panel_mod->enable_gpio);
365 dev_err(&pdev->dev, "failed to request enable GPIO\n");
366 goto fail_backlight;
367 }
368
369 if (panel_mod->enable_gpio)
370 dev_info(&pdev->dev, "found enable GPIO\n");
371
372 mod = &panel_mod->base;
373 pdev->dev.platform_data = mod;
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
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");
384 ret = -EINVAL;
385 goto fail_free;
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");
391 ret = -EINVAL;
392 goto fail_timings;
393 }
394
395 mod->preferred_bpp = panel_mod->info->bpp;
396
397 return 0;
398
399fail_timings:
400 display_timings_release(panel_mod->timings);
401
402fail_free:
403 tilcdc_module_cleanup(mod);
404
405fail_backlight:
406 if (panel_mod->backlight)
407 put_device(&panel_mod->backlight->dev);
408 return ret;
409}
410
411static int panel_remove(struct platform_device *pdev)
412{
413 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
414 struct panel_module *panel_mod = to_panel_module(mod);
415 struct backlight_device *backlight = panel_mod->backlight;
416
417 if (backlight)
418 put_device(&backlight->dev);
419
420 display_timings_release(panel_mod->timings);
421
422 tilcdc_module_cleanup(mod);
423 kfree(panel_mod->info);
424
425 return 0;
426}
427
428static struct of_device_id panel_of_match[] = {
429 { .compatible = "ti,tilcdc,panel", },
430 { },
431};
432
433struct 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
443int __init tilcdc_panel_init(void)
444{
445 return platform_driver_register(&panel_driver);
446}
447
448void __exit tilcdc_panel_fini(void)
449{
450 platform_driver_unregister(&panel_driver);
451}
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 <linux/gpio/consumer.h>
22#include <video/display_timing.h>
23#include <video/of_display_timing.h>
24#include <video/videomode.h>
25#include <drm/drm_atomic_helper.h>
26
27#include "tilcdc_drv.h"
28#include "tilcdc_panel.h"
29
30struct panel_module {
31 struct tilcdc_module base;
32 struct tilcdc_panel_info *info;
33 struct display_timings *timings;
34 struct backlight_device *backlight;
35 struct gpio_desc *enable_gpio;
36};
37#define to_panel_module(x) container_of(x, struct panel_module, base)
38
39
40/*
41 * Encoder:
42 */
43
44struct 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
50static 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;
54 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
55
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 }
61
62 if (gpio)
63 gpiod_set_value_cansleep(gpio,
64 mode == DRM_MODE_DPMS_ON ? 1 : 0);
65}
66
67static void panel_encoder_prepare(struct drm_encoder *encoder)
68{
69 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
70}
71
72static void panel_encoder_commit(struct drm_encoder *encoder)
73{
74 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
75}
76
77static 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
84static const struct drm_encoder_funcs panel_encoder_funcs = {
85 .destroy = drm_encoder_cleanup,
86};
87
88static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
89 .dpms = panel_encoder_dpms,
90 .prepare = panel_encoder_prepare,
91 .commit = panel_encoder_commit,
92 .mode_set = panel_encoder_mode_set,
93};
94
95static 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
102 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
103 GFP_KERNEL);
104 if (!panel_encoder)
105 return NULL;
106
107 panel_encoder->mod = mod;
108
109 encoder = &panel_encoder->base;
110 encoder->possible_crtcs = 1;
111
112 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
113 DRM_MODE_ENCODER_LVDS, NULL);
114 if (ret < 0)
115 goto fail;
116
117 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
118
119 return encoder;
120
121fail:
122 drm_encoder_cleanup(encoder);
123 return NULL;
124}
125
126/*
127 * Connector:
128 */
129
130struct panel_connector {
131 struct drm_connector base;
132
133 struct drm_encoder *encoder; /* our connected encoder */
134 struct panel_module *mod;
135};
136#define to_panel_connector(x) container_of(x, struct panel_connector, base)
137
138
139static void panel_connector_destroy(struct drm_connector *connector)
140{
141 drm_connector_unregister(connector);
142 drm_connector_cleanup(connector);
143}
144
145static int panel_connector_get_modes(struct drm_connector *connector)
146{
147 struct drm_device *dev = connector->dev;
148 struct panel_connector *panel_connector = to_panel_connector(connector);
149 struct display_timings *timings = panel_connector->mod->timings;
150 int i;
151
152 for (i = 0; i < timings->num_timings; i++) {
153 struct drm_display_mode *mode = drm_mode_create(dev);
154 struct videomode vm;
155
156 if (videomode_from_timings(timings, &vm, i))
157 break;
158
159 drm_display_mode_from_videomode(&vm, mode);
160
161 mode->type = DRM_MODE_TYPE_DRIVER;
162
163 if (timings->native_mode == i)
164 mode->type |= DRM_MODE_TYPE_PREFERRED;
165
166 drm_mode_set_name(mode);
167 drm_mode_probed_add(connector, mode);
168 }
169
170 return i;
171}
172
173static int panel_connector_mode_valid(struct drm_connector *connector,
174 struct drm_display_mode *mode)
175{
176 struct tilcdc_drm_private *priv = connector->dev->dev_private;
177 /* our only constraints are what the crtc can generate: */
178 return tilcdc_crtc_mode_valid(priv->crtc, mode);
179}
180
181static struct drm_encoder *panel_connector_best_encoder(
182 struct drm_connector *connector)
183{
184 struct panel_connector *panel_connector = to_panel_connector(connector);
185 return panel_connector->encoder;
186}
187
188static const struct drm_connector_funcs panel_connector_funcs = {
189 .destroy = panel_connector_destroy,
190 .fill_modes = drm_helper_probe_single_connector_modes,
191 .reset = drm_atomic_helper_connector_reset,
192 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
193 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
194};
195
196static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
197 .get_modes = panel_connector_get_modes,
198 .mode_valid = panel_connector_mode_valid,
199 .best_encoder = panel_connector_best_encoder,
200};
201
202static struct drm_connector *panel_connector_create(struct drm_device *dev,
203 struct panel_module *mod, struct drm_encoder *encoder)
204{
205 struct panel_connector *panel_connector;
206 struct drm_connector *connector;
207 int ret;
208
209 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
210 GFP_KERNEL);
211 if (!panel_connector)
212 return NULL;
213
214 panel_connector->encoder = encoder;
215 panel_connector->mod = mod;
216
217 connector = &panel_connector->base;
218
219 drm_connector_init(dev, connector, &panel_connector_funcs,
220 DRM_MODE_CONNECTOR_LVDS);
221 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
222
223 connector->interlace_allowed = 0;
224 connector->doublescan_allowed = 0;
225
226 ret = drm_mode_connector_attach_encoder(connector, encoder);
227 if (ret)
228 goto fail;
229
230 return connector;
231
232fail:
233 panel_connector_destroy(connector);
234 return NULL;
235}
236
237/*
238 * Module:
239 */
240
241static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
242{
243 struct panel_module *panel_mod = to_panel_module(mod);
244 struct tilcdc_drm_private *priv = dev->dev_private;
245 struct drm_encoder *encoder;
246 struct drm_connector *connector;
247
248 encoder = panel_encoder_create(dev, panel_mod);
249 if (!encoder)
250 return -ENOMEM;
251
252 connector = panel_connector_create(dev, panel_mod, encoder);
253 if (!connector)
254 return -ENOMEM;
255
256 priv->encoders[priv->num_encoders++] = encoder;
257 priv->connectors[priv->num_connectors++] = connector;
258
259 tilcdc_crtc_set_panel_info(priv->crtc,
260 to_panel_encoder(encoder)->mod->info);
261
262 return 0;
263}
264
265static const struct tilcdc_module_ops panel_module_ops = {
266 .modeset_init = panel_modeset_init,
267};
268
269/*
270 * Device:
271 */
272
273/* maybe move this somewhere common if it is needed by other outputs? */
274static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
275{
276 struct device_node *info_np;
277 struct tilcdc_panel_info *info;
278 int ret = 0;
279
280 if (!np) {
281 pr_err("%s: no devicenode given\n", __func__);
282 return NULL;
283 }
284
285 info_np = of_get_child_by_name(np, "panel-info");
286 if (!info_np) {
287 pr_err("%s: could not find panel-info node\n", __func__);
288 return NULL;
289 }
290
291 info = kzalloc(sizeof(*info), GFP_KERNEL);
292 if (!info)
293 goto put_node;
294
295 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
296 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
297 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
298 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
299 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
300 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
301 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
302 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
303 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
304
305 /* optional: */
306 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
307 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
308
309 if (ret) {
310 pr_err("%s: error reading panel-info properties\n", __func__);
311 kfree(info);
312 info = NULL;
313 }
314
315put_node:
316 of_node_put(info_np);
317 return info;
318}
319
320static int panel_probe(struct platform_device *pdev)
321{
322 struct device_node *bl_node, *node = pdev->dev.of_node;
323 struct panel_module *panel_mod;
324 struct tilcdc_module *mod;
325 struct pinctrl *pinctrl;
326 int ret;
327
328 /* bail out early if no DT data: */
329 if (!node) {
330 dev_err(&pdev->dev, "device-tree data is missing\n");
331 return -ENXIO;
332 }
333
334 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
335 if (!panel_mod)
336 return -ENOMEM;
337
338 bl_node = of_parse_phandle(node, "backlight", 0);
339 if (bl_node) {
340 panel_mod->backlight = of_find_backlight_by_node(bl_node);
341 of_node_put(bl_node);
342
343 if (!panel_mod->backlight)
344 return -EPROBE_DEFER;
345
346 dev_info(&pdev->dev, "found backlight\n");
347 }
348
349 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
350 GPIOD_OUT_LOW);
351 if (IS_ERR(panel_mod->enable_gpio)) {
352 ret = PTR_ERR(panel_mod->enable_gpio);
353 dev_err(&pdev->dev, "failed to request enable GPIO\n");
354 goto fail_backlight;
355 }
356
357 if (panel_mod->enable_gpio)
358 dev_info(&pdev->dev, "found enable GPIO\n");
359
360 mod = &panel_mod->base;
361 pdev->dev.platform_data = mod;
362
363 tilcdc_module_init(mod, "panel", &panel_module_ops);
364
365 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
366 if (IS_ERR(pinctrl))
367 dev_warn(&pdev->dev, "pins are not configured\n");
368
369 panel_mod->timings = of_get_display_timings(node);
370 if (!panel_mod->timings) {
371 dev_err(&pdev->dev, "could not get panel timings\n");
372 ret = -EINVAL;
373 goto fail_free;
374 }
375
376 panel_mod->info = of_get_panel_info(node);
377 if (!panel_mod->info) {
378 dev_err(&pdev->dev, "could not get panel info\n");
379 ret = -EINVAL;
380 goto fail_timings;
381 }
382
383 return 0;
384
385fail_timings:
386 display_timings_release(panel_mod->timings);
387
388fail_free:
389 tilcdc_module_cleanup(mod);
390
391fail_backlight:
392 if (panel_mod->backlight)
393 put_device(&panel_mod->backlight->dev);
394 return ret;
395}
396
397static int panel_remove(struct platform_device *pdev)
398{
399 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
400 struct panel_module *panel_mod = to_panel_module(mod);
401 struct backlight_device *backlight = panel_mod->backlight;
402
403 if (backlight)
404 put_device(&backlight->dev);
405
406 display_timings_release(panel_mod->timings);
407
408 tilcdc_module_cleanup(mod);
409 kfree(panel_mod->info);
410
411 return 0;
412}
413
414static const 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 = "tilcdc-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}