1 /*
2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3  * Author:
4  *      Mark Yao <mark.yao@rock-chips.com>
5  *      Sandy Huang <hjc@rock-chips.com>
6  *
7  * This software is licensed under the terms of the GNU General Public
8  * License version 2, as published by the Free Software Foundation, and
9  * may be copied, distributed, and modified under those terms.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  */
16 
17 #include <drm/drmP.h>
18 #include <drm/drm_atomic_helper.h>
19 #include <drm/drm_crtc_helper.h>
20 #include <drm/drm_dp_helper.h>
21 #include <drm/drm_panel.h>
22 #include <drm/drm_of.h>
23 
24 #include <linux/component.h>
25 #include <linux/clk.h>
26 #include <linux/mfd/syscon.h>
27 #include <linux/of_graph.h>
28 #include <linux/pinctrl/devinfo.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/regmap.h>
31 #include <linux/reset.h>
32 
33 #include "rockchip_drm_drv.h"
34 #include "rockchip_drm_vop.h"
35 #include "rockchip_lvds.h"
36 
37 #define DISPLAY_OUTPUT_RGB		0
38 #define DISPLAY_OUTPUT_LVDS		1
39 #define DISPLAY_OUTPUT_DUAL_LVDS	2
40 
41 #define connector_to_lvds(c) \
42 		container_of(c, struct rockchip_lvds, connector)
43 
44 #define encoder_to_lvds(c) \
45 		container_of(c, struct rockchip_lvds, encoder)
46 
47 /**
48  * rockchip_lvds_soc_data - rockchip lvds Soc private data
49  * @ch1_offset: lvds channel 1 registe offset
50  * grf_soc_con6: general registe offset for LVDS contrl
51  * grf_soc_con7: general registe offset for LVDS contrl
52  * has_vop_sel: to indicate whether need to choose from different VOP.
53  */
54 struct rockchip_lvds_soc_data {
55 	u32 ch1_offset;
56 	int grf_soc_con6;
57 	int grf_soc_con7;
58 	bool has_vop_sel;
59 };
60 
61 struct rockchip_lvds {
62 	struct device *dev;
63 	void __iomem *regs;
64 	struct regmap *grf;
65 	struct clk *pclk;
66 	const struct rockchip_lvds_soc_data *soc_data;
67 	int output; /* rgb lvds or dual lvds output */
68 	int format; /* vesa or jeida format */
69 	struct drm_device *drm_dev;
70 	struct drm_panel *panel;
71 	struct drm_bridge *bridge;
72 	struct drm_connector connector;
73 	struct drm_encoder encoder;
74 	struct dev_pin_info *pins;
75 };
76 
77 static inline void lvds_writel(struct rockchip_lvds *lvds, u32 offset, u32 val)
78 {
79 	writel_relaxed(val, lvds->regs + offset);
80 	if (lvds->output == DISPLAY_OUTPUT_LVDS)
81 		return;
82 	writel_relaxed(val, lvds->regs + offset + lvds->soc_data->ch1_offset);
83 }
84 
85 static inline int lvds_name_to_format(const char *s)
86 {
87 	if (strncmp(s, "jeida-18", 8) == 0)
88 		return LVDS_JEIDA_18;
89 	else if (strncmp(s, "jeida-24", 8) == 0)
90 		return LVDS_JEIDA_24;
91 	else if (strncmp(s, "vesa-24", 7) == 0)
92 		return LVDS_VESA_24;
93 
94 	return -EINVAL;
95 }
96 
97 static inline int lvds_name_to_output(const char *s)
98 {
99 	if (strncmp(s, "rgb", 3) == 0)
100 		return DISPLAY_OUTPUT_RGB;
101 	else if (strncmp(s, "lvds", 4) == 0)
102 		return DISPLAY_OUTPUT_LVDS;
103 	else if (strncmp(s, "duallvds", 8) == 0)
104 		return DISPLAY_OUTPUT_DUAL_LVDS;
105 
106 	return -EINVAL;
107 }
108 
109 static int rockchip_lvds_poweron(struct rockchip_lvds *lvds)
110 {
111 	int ret;
112 	u32 val;
113 
114 	ret = clk_enable(lvds->pclk);
115 	if (ret < 0) {
116 		DRM_DEV_ERROR(lvds->dev, "failed to enable lvds pclk %d\n", ret);
117 		return ret;
118 	}
119 	ret = pm_runtime_get_sync(lvds->dev);
120 	if (ret < 0) {
121 		DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
122 		clk_disable(lvds->pclk);
123 		return ret;
124 	}
125 	val = RK3288_LVDS_CH0_REG0_LANE4_EN | RK3288_LVDS_CH0_REG0_LANE3_EN |
126 		RK3288_LVDS_CH0_REG0_LANE2_EN | RK3288_LVDS_CH0_REG0_LANE1_EN |
127 		RK3288_LVDS_CH0_REG0_LANE0_EN;
128 	if (lvds->output == DISPLAY_OUTPUT_RGB) {
129 		val |= RK3288_LVDS_CH0_REG0_TTL_EN |
130 			RK3288_LVDS_CH0_REG0_LANECK_EN;
131 		lvds_writel(lvds, RK3288_LVDS_CH0_REG0, val);
132 		lvds_writel(lvds, RK3288_LVDS_CH0_REG2,
133 			    RK3288_LVDS_PLL_FBDIV_REG2(0x46));
134 		lvds_writel(lvds, RK3288_LVDS_CH0_REG4,
135 			    RK3288_LVDS_CH0_REG4_LANECK_TTL_MODE |
136 			    RK3288_LVDS_CH0_REG4_LANE4_TTL_MODE |
137 			    RK3288_LVDS_CH0_REG4_LANE3_TTL_MODE |
138 			    RK3288_LVDS_CH0_REG4_LANE2_TTL_MODE |
139 			    RK3288_LVDS_CH0_REG4_LANE1_TTL_MODE |
140 			    RK3288_LVDS_CH0_REG4_LANE0_TTL_MODE);
141 		lvds_writel(lvds, RK3288_LVDS_CH0_REG5,
142 			    RK3288_LVDS_CH0_REG5_LANECK_TTL_DATA |
143 			    RK3288_LVDS_CH0_REG5_LANE4_TTL_DATA |
144 			    RK3288_LVDS_CH0_REG5_LANE3_TTL_DATA |
145 			    RK3288_LVDS_CH0_REG5_LANE2_TTL_DATA |
146 			    RK3288_LVDS_CH0_REG5_LANE1_TTL_DATA |
147 			    RK3288_LVDS_CH0_REG5_LANE0_TTL_DATA);
148 	} else {
149 		val |= RK3288_LVDS_CH0_REG0_LVDS_EN |
150 			    RK3288_LVDS_CH0_REG0_LANECK_EN;
151 		lvds_writel(lvds, RK3288_LVDS_CH0_REG0, val);
152 		lvds_writel(lvds, RK3288_LVDS_CH0_REG1,
153 			    RK3288_LVDS_CH0_REG1_LANECK_BIAS |
154 			    RK3288_LVDS_CH0_REG1_LANE4_BIAS |
155 			    RK3288_LVDS_CH0_REG1_LANE3_BIAS |
156 			    RK3288_LVDS_CH0_REG1_LANE2_BIAS |
157 			    RK3288_LVDS_CH0_REG1_LANE1_BIAS |
158 			    RK3288_LVDS_CH0_REG1_LANE0_BIAS);
159 		lvds_writel(lvds, RK3288_LVDS_CH0_REG2,
160 			    RK3288_LVDS_CH0_REG2_RESERVE_ON |
161 			    RK3288_LVDS_CH0_REG2_LANECK_LVDS_MODE |
162 			    RK3288_LVDS_CH0_REG2_LANE4_LVDS_MODE |
163 			    RK3288_LVDS_CH0_REG2_LANE3_LVDS_MODE |
164 			    RK3288_LVDS_CH0_REG2_LANE2_LVDS_MODE |
165 			    RK3288_LVDS_CH0_REG2_LANE1_LVDS_MODE |
166 			    RK3288_LVDS_CH0_REG2_LANE0_LVDS_MODE |
167 			    RK3288_LVDS_PLL_FBDIV_REG2(0x46));
168 		lvds_writel(lvds, RK3288_LVDS_CH0_REG4, 0x00);
169 		lvds_writel(lvds, RK3288_LVDS_CH0_REG5, 0x00);
170 	}
171 	lvds_writel(lvds, RK3288_LVDS_CH0_REG3, RK3288_LVDS_PLL_FBDIV_REG3(0x46));
172 	lvds_writel(lvds, RK3288_LVDS_CH0_REGD, RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
173 	lvds_writel(lvds, RK3288_LVDS_CH0_REG20, RK3288_LVDS_CH0_REG20_LSB);
174 
175 	lvds_writel(lvds, RK3288_LVDS_CFG_REGC, RK3288_LVDS_CFG_REGC_PLL_ENABLE);
176 	lvds_writel(lvds, RK3288_LVDS_CFG_REG21, RK3288_LVDS_CFG_REG21_TX_ENABLE);
177 
178 	return 0;
179 }
180 
181 static void rockchip_lvds_poweroff(struct rockchip_lvds *lvds)
182 {
183 	int ret;
184 	u32 val;
185 
186 	lvds_writel(lvds, RK3288_LVDS_CFG_REG21, RK3288_LVDS_CFG_REG21_TX_ENABLE);
187 	lvds_writel(lvds, RK3288_LVDS_CFG_REGC, RK3288_LVDS_CFG_REGC_PLL_ENABLE);
188 	val = LVDS_DUAL | LVDS_TTL_EN | LVDS_CH0_EN | LVDS_CH1_EN | LVDS_PWRDN;
189 	val |= val << 16;
190 	ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con7, val);
191 	if (ret != 0)
192 		DRM_DEV_ERROR(lvds->dev, "Could not write to GRF: %d\n", ret);
193 
194 	pm_runtime_put(lvds->dev);
195 	clk_disable(lvds->pclk);
196 }
197 
198 static const struct drm_connector_funcs rockchip_lvds_connector_funcs = {
199 	.fill_modes = drm_helper_probe_single_connector_modes,
200 	.destroy = drm_connector_cleanup,
201 	.reset = drm_atomic_helper_connector_reset,
202 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
203 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
204 };
205 
206 static int rockchip_lvds_connector_get_modes(struct drm_connector *connector)
207 {
208 	struct rockchip_lvds *lvds = connector_to_lvds(connector);
209 	struct drm_panel *panel = lvds->panel;
210 
211 	return drm_panel_get_modes(panel);
212 }
213 
214 static const
215 struct drm_connector_helper_funcs rockchip_lvds_connector_helper_funcs = {
216 	.get_modes = rockchip_lvds_connector_get_modes,
217 };
218 
219 static void rockchip_lvds_grf_config(struct drm_encoder *encoder,
220 				     struct drm_display_mode *mode)
221 {
222 	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
223 	u8 pin_hsync = (mode->flags & DRM_MODE_FLAG_PHSYNC) ? 1 : 0;
224 	u8 pin_dclk = (mode->flags & DRM_MODE_FLAG_PCSYNC) ? 1 : 0;
225 	u32 val;
226 	int ret;
227 
228 	/* iomux to LCD data/sync mode */
229 	if (lvds->output == DISPLAY_OUTPUT_RGB)
230 		if (lvds->pins && !IS_ERR(lvds->pins->default_state))
231 			pinctrl_select_state(lvds->pins->p,
232 					     lvds->pins->default_state);
233 	val = lvds->format | LVDS_CH0_EN;
234 	if (lvds->output == DISPLAY_OUTPUT_RGB)
235 		val |= LVDS_TTL_EN | LVDS_CH1_EN;
236 	else if (lvds->output == DISPLAY_OUTPUT_DUAL_LVDS)
237 		val |= LVDS_DUAL | LVDS_CH1_EN;
238 
239 	if ((mode->htotal - mode->hsync_start) & 0x01)
240 		val |= LVDS_START_PHASE_RST_1;
241 
242 	val |= (pin_dclk << 8) | (pin_hsync << 9);
243 	val |= (0xffff << 16);
244 	ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con7, val);
245 	if (ret != 0) {
246 		DRM_DEV_ERROR(lvds->dev, "Could not write to GRF: %d\n", ret);
247 		return;
248 	}
249 }
250 
251 static int rockchip_lvds_set_vop_source(struct rockchip_lvds *lvds,
252 					struct drm_encoder *encoder)
253 {
254 	u32 val;
255 	int ret;
256 
257 	if (!lvds->soc_data->has_vop_sel)
258 		return 0;
259 
260 	ret = drm_of_encoder_active_endpoint_id(lvds->dev->of_node, encoder);
261 	if (ret < 0)
262 		return ret;
263 
264 	val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16;
265 	if (ret)
266 		val |= RK3288_LVDS_SOC_CON6_SEL_VOP_LIT;
267 
268 	ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con6, val);
269 	if (ret < 0)
270 		return ret;
271 
272 	return 0;
273 }
274 
275 static int
276 rockchip_lvds_encoder_atomic_check(struct drm_encoder *encoder,
277 				   struct drm_crtc_state *crtc_state,
278 				   struct drm_connector_state *conn_state)
279 {
280 	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
281 
282 	s->output_mode = ROCKCHIP_OUT_MODE_P888;
283 	s->output_type = DRM_MODE_CONNECTOR_LVDS;
284 
285 	return 0;
286 }
287 
288 static void rockchip_lvds_encoder_enable(struct drm_encoder *encoder)
289 {
290 	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
291 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
292 	int ret;
293 
294 	drm_panel_prepare(lvds->panel);
295 	ret = rockchip_lvds_poweron(lvds);
296 	if (ret < 0) {
297 		DRM_DEV_ERROR(lvds->dev, "failed to power on lvds: %d\n", ret);
298 		drm_panel_unprepare(lvds->panel);
299 	}
300 	rockchip_lvds_grf_config(encoder, mode);
301 	rockchip_lvds_set_vop_source(lvds, encoder);
302 	drm_panel_enable(lvds->panel);
303 }
304 
305 static void rockchip_lvds_encoder_disable(struct drm_encoder *encoder)
306 {
307 	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
308 
309 	drm_panel_disable(lvds->panel);
310 	rockchip_lvds_poweroff(lvds);
311 	drm_panel_unprepare(lvds->panel);
312 }
313 
314 static const
315 struct drm_encoder_helper_funcs rockchip_lvds_encoder_helper_funcs = {
316 	.enable = rockchip_lvds_encoder_enable,
317 	.disable = rockchip_lvds_encoder_disable,
318 	.atomic_check = rockchip_lvds_encoder_atomic_check,
319 };
320 
321 static const struct drm_encoder_funcs rockchip_lvds_encoder_funcs = {
322 	.destroy = drm_encoder_cleanup,
323 };
324 
325 static const struct rockchip_lvds_soc_data rk3288_lvds_data = {
326 	.ch1_offset = 0x100,
327 	.grf_soc_con6 = 0x025c,
328 	.grf_soc_con7 = 0x0260,
329 	.has_vop_sel = true,
330 };
331 
332 static const struct of_device_id rockchip_lvds_dt_ids[] = {
333 	{
334 		.compatible = "rockchip,rk3288-lvds",
335 		.data = &rk3288_lvds_data
336 	},
337 	{}
338 };
339 MODULE_DEVICE_TABLE(of, rockchip_lvds_dt_ids);
340 
341 static int rockchip_lvds_bind(struct device *dev, struct device *master,
342 			      void *data)
343 {
344 	struct rockchip_lvds *lvds = dev_get_drvdata(dev);
345 	struct drm_device *drm_dev = data;
346 	struct drm_encoder *encoder;
347 	struct drm_connector *connector;
348 	struct device_node *remote = NULL;
349 	struct device_node  *port, *endpoint;
350 	int ret = 0, child_count = 0;
351 	const char *name;
352 	u32 endpoint_id;
353 
354 	lvds->drm_dev = drm_dev;
355 	port = of_graph_get_port_by_id(dev->of_node, 1);
356 	if (!port) {
357 		DRM_DEV_ERROR(dev,
358 			      "can't found port point, please init lvds panel port!\n");
359 		return -EINVAL;
360 	}
361 	for_each_child_of_node(port, endpoint) {
362 		child_count++;
363 		of_property_read_u32(endpoint, "reg", &endpoint_id);
364 		ret = drm_of_find_panel_or_bridge(dev->of_node, 1, endpoint_id,
365 						  &lvds->panel, &lvds->bridge);
366 		if (!ret) {
367 			of_node_put(endpoint);
368 			break;
369 		}
370 	}
371 	if (!child_count) {
372 		DRM_DEV_ERROR(dev, "lvds port does not have any children\n");
373 		ret = -EINVAL;
374 		goto err_put_port;
375 	} else if (ret) {
376 		DRM_DEV_ERROR(dev, "failed to find panel and bridge node\n");
377 		ret = -EPROBE_DEFER;
378 		goto err_put_port;
379 	}
380 	if (lvds->panel)
381 		remote = lvds->panel->dev->of_node;
382 	else
383 		remote = lvds->bridge->of_node;
384 	if (of_property_read_string(dev->of_node, "rockchip,output", &name))
385 		/* default set it as output rgb */
386 		lvds->output = DISPLAY_OUTPUT_RGB;
387 	else
388 		lvds->output = lvds_name_to_output(name);
389 
390 	if (lvds->output < 0) {
391 		DRM_DEV_ERROR(dev, "invalid output type [%s]\n", name);
392 		ret = lvds->output;
393 		goto err_put_remote;
394 	}
395 
396 	if (of_property_read_string(remote, "data-mapping", &name))
397 		/* default set it as format vesa 18 */
398 		lvds->format = LVDS_VESA_18;
399 	else
400 		lvds->format = lvds_name_to_format(name);
401 
402 	if (lvds->format < 0) {
403 		DRM_DEV_ERROR(dev, "invalid data-mapping format [%s]\n", name);
404 		ret = lvds->format;
405 		goto err_put_remote;
406 	}
407 
408 	encoder = &lvds->encoder;
409 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
410 							     dev->of_node);
411 
412 	ret = drm_encoder_init(drm_dev, encoder, &rockchip_lvds_encoder_funcs,
413 			       DRM_MODE_ENCODER_LVDS, NULL);
414 	if (ret < 0) {
415 		DRM_DEV_ERROR(drm_dev->dev,
416 			      "failed to initialize encoder: %d\n", ret);
417 		goto err_put_remote;
418 	}
419 
420 	drm_encoder_helper_add(encoder, &rockchip_lvds_encoder_helper_funcs);
421 
422 	if (lvds->panel) {
423 		connector = &lvds->connector;
424 		connector->dpms = DRM_MODE_DPMS_OFF;
425 		ret = drm_connector_init(drm_dev, connector,
426 					 &rockchip_lvds_connector_funcs,
427 					 DRM_MODE_CONNECTOR_LVDS);
428 		if (ret < 0) {
429 			DRM_DEV_ERROR(drm_dev->dev,
430 				      "failed to initialize connector: %d\n", ret);
431 			goto err_free_encoder;
432 		}
433 
434 		drm_connector_helper_add(connector,
435 					 &rockchip_lvds_connector_helper_funcs);
436 
437 		ret = drm_connector_attach_encoder(connector, encoder);
438 		if (ret < 0) {
439 			DRM_DEV_ERROR(drm_dev->dev,
440 				      "failed to attach encoder: %d\n", ret);
441 			goto err_free_connector;
442 		}
443 
444 		ret = drm_panel_attach(lvds->panel, connector);
445 		if (ret < 0) {
446 			DRM_DEV_ERROR(drm_dev->dev,
447 				      "failed to attach panel: %d\n", ret);
448 			goto err_free_connector;
449 		}
450 	} else {
451 		ret = drm_bridge_attach(encoder, lvds->bridge, NULL);
452 		if (ret) {
453 			DRM_DEV_ERROR(drm_dev->dev,
454 				      "failed to attach bridge: %d\n", ret);
455 			goto err_free_encoder;
456 		}
457 	}
458 
459 	pm_runtime_enable(dev);
460 	of_node_put(remote);
461 	of_node_put(port);
462 
463 	return 0;
464 
465 err_free_connector:
466 	drm_connector_cleanup(connector);
467 err_free_encoder:
468 	drm_encoder_cleanup(encoder);
469 err_put_remote:
470 	of_node_put(remote);
471 err_put_port:
472 	of_node_put(port);
473 
474 	return ret;
475 }
476 
477 static void rockchip_lvds_unbind(struct device *dev, struct device *master,
478 				void *data)
479 {
480 	struct rockchip_lvds *lvds = dev_get_drvdata(dev);
481 
482 	rockchip_lvds_encoder_disable(&lvds->encoder);
483 	if (lvds->panel)
484 		drm_panel_detach(lvds->panel);
485 	pm_runtime_disable(dev);
486 	drm_connector_cleanup(&lvds->connector);
487 	drm_encoder_cleanup(&lvds->encoder);
488 }
489 
490 static const struct component_ops rockchip_lvds_component_ops = {
491 	.bind = rockchip_lvds_bind,
492 	.unbind = rockchip_lvds_unbind,
493 };
494 
495 static int rockchip_lvds_probe(struct platform_device *pdev)
496 {
497 	struct device *dev = &pdev->dev;
498 	struct rockchip_lvds *lvds;
499 	const struct of_device_id *match;
500 	struct resource *res;
501 	int ret;
502 
503 	if (!dev->of_node)
504 		return -ENODEV;
505 
506 	lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
507 	if (!lvds)
508 		return -ENOMEM;
509 
510 	lvds->dev = dev;
511 	match = of_match_node(rockchip_lvds_dt_ids, dev->of_node);
512 	if (!match)
513 		return -ENODEV;
514 	lvds->soc_data = match->data;
515 
516 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
517 	lvds->regs = devm_ioremap_resource(&pdev->dev, res);
518 	if (IS_ERR(lvds->regs))
519 		return PTR_ERR(lvds->regs);
520 
521 	lvds->pclk = devm_clk_get(&pdev->dev, "pclk_lvds");
522 	if (IS_ERR(lvds->pclk)) {
523 		DRM_DEV_ERROR(dev, "could not get pclk_lvds\n");
524 		return PTR_ERR(lvds->pclk);
525 	}
526 
527 	lvds->pins = devm_kzalloc(lvds->dev, sizeof(*lvds->pins),
528 				  GFP_KERNEL);
529 	if (!lvds->pins)
530 		return -ENOMEM;
531 
532 	lvds->pins->p = devm_pinctrl_get(lvds->dev);
533 	if (IS_ERR(lvds->pins->p)) {
534 		DRM_DEV_ERROR(dev, "no pinctrl handle\n");
535 		devm_kfree(lvds->dev, lvds->pins);
536 		lvds->pins = NULL;
537 	} else {
538 		lvds->pins->default_state =
539 			pinctrl_lookup_state(lvds->pins->p, "lcdc");
540 		if (IS_ERR(lvds->pins->default_state)) {
541 			DRM_DEV_ERROR(dev, "no default pinctrl state\n");
542 			devm_kfree(lvds->dev, lvds->pins);
543 			lvds->pins = NULL;
544 		}
545 	}
546 
547 	lvds->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
548 						    "rockchip,grf");
549 	if (IS_ERR(lvds->grf)) {
550 		DRM_DEV_ERROR(dev, "missing rockchip,grf property\n");
551 		return PTR_ERR(lvds->grf);
552 	}
553 
554 	dev_set_drvdata(dev, lvds);
555 
556 	ret = clk_prepare(lvds->pclk);
557 	if (ret < 0) {
558 		DRM_DEV_ERROR(dev, "failed to prepare pclk_lvds\n");
559 		return ret;
560 	}
561 	ret = component_add(&pdev->dev, &rockchip_lvds_component_ops);
562 	if (ret < 0) {
563 		DRM_DEV_ERROR(dev, "failed to add component\n");
564 		clk_unprepare(lvds->pclk);
565 	}
566 
567 	return ret;
568 }
569 
570 static int rockchip_lvds_remove(struct platform_device *pdev)
571 {
572 	struct rockchip_lvds *lvds = dev_get_drvdata(&pdev->dev);
573 
574 	component_del(&pdev->dev, &rockchip_lvds_component_ops);
575 	clk_unprepare(lvds->pclk);
576 
577 	return 0;
578 }
579 
580 struct platform_driver rockchip_lvds_driver = {
581 	.probe = rockchip_lvds_probe,
582 	.remove = rockchip_lvds_remove,
583 	.driver = {
584 		   .name = "rockchip-lvds",
585 		   .of_match_table = of_match_ptr(rockchip_lvds_dt_ids),
586 	},
587 };
588