ov6211.c

  1// SPDX-License-Identifier: GPL-2.0
  2// Copyright (c) 2024-2025 Linaro Ltd
  3
  4#include <linux/clk.h>
  5#include <linux/delay.h>
  6#include <linux/gpio/consumer.h>
  7#include <linux/i2c.h>
  8#include <linux/module.h>
  9#include <linux/pm_runtime.h>
 10#include <linux/regulator/consumer.h>
 11#include <linux/units.h>
 12#include <media/v4l2-cci.h>
 13#include <media/v4l2-ctrls.h>
 14#include <media/v4l2-device.h>
 15#include <media/v4l2-fwnode.h>
 16
 17#define OV6211_LINK_FREQ_480MHZ		(480 * HZ_PER_MHZ)
 18#define OV6211_MCLK_FREQ_24MHZ		(24 * HZ_PER_MHZ)
 19
 20#define OV6211_REG_CHIP_ID		CCI_REG16(0x300a)
 21#define OV6211_CHIP_ID			0x6710
 22
 23#define OV6211_REG_MODE_SELECT		CCI_REG8(0x0100)
 24#define OV6211_MODE_STANDBY		0x00
 25#define OV6211_MODE_STREAMING		BIT(0)
 26
 27#define OV6211_REG_SOFTWARE_RST		CCI_REG8(0x0103)
 28#define OV6211_SOFTWARE_RST		BIT(0)
 29
 30/* Exposure controls from sensor */
 31#define OV6211_REG_EXPOSURE		CCI_REG24(0x3500)
 32#define OV6211_EXPOSURE_MIN		1
 33#define OV6211_EXPOSURE_MAX_MARGIN	4
 34#define OV6211_EXPOSURE_STEP		1
 35#define OV6211_EXPOSURE_DEFAULT		210
 36
 37/* Analogue gain controls from sensor */
 38#define OV6211_REG_ANALOGUE_GAIN	CCI_REG16(0x350a)
 39#define OV6211_ANALOGUE_GAIN_MIN	1
 40#define OV6211_ANALOGUE_GAIN_MAX	0x3ff
 41#define OV6211_ANALOGUE_GAIN_STEP	1
 42#define OV6211_ANALOGUE_GAIN_DEFAULT	160
 43
 44/* Test pattern */
 45#define OV6211_REG_PRE_ISP		CCI_REG8(0x5e00)
 46#define OV6211_TEST_PATTERN_ENABLE	BIT(7)
 47
 48#define to_ov6211(_sd)			container_of(_sd, struct ov6211, sd)
 49
 50static const s64 ov6211_link_freq_menu[] = {
 51	OV6211_LINK_FREQ_480MHZ,
 52};
 53
 54struct ov6211_reg_list {
 55	const struct cci_reg_sequence *regs;
 56	unsigned int num_regs;
 57};
 58
 59struct ov6211_mode {
 60	u32 width;	/* Frame width in pixels */
 61	u32 height;	/* Frame height in pixels */
 62	u32 hts;	/* Horizontal timing size */
 63	u32 vts;	/* Default vertical timing size */
 64	u32 bpp;	/* Bits per pixel */
 65
 66	const struct ov6211_reg_list reg_list;	/* Sensor register setting */
 67};
 68
 69static const char * const ov6211_test_pattern_menu[] = {
 70	"Disabled",
 71	"Vertical Colour Bars",
 72};
 73
 74static const char * const ov6211_supply_names[] = {
 75	"avdd",		/* Analog power */
 76	"dovdd",	/* Digital I/O power */
 77	"dvdd",		/* Digital core power */
 78};
 79
 80#define OV6211_NUM_SUPPLIES	ARRAY_SIZE(ov6211_supply_names)
 81
 82struct ov6211 {
 83	struct device *dev;
 84	struct regmap *regmap;
 85	struct clk *xvclk;
 86	struct gpio_desc *reset_gpio;
 87	struct regulator_bulk_data supplies[OV6211_NUM_SUPPLIES];
 88
 89	struct v4l2_subdev sd;
 90	struct media_pad pad;
 91
 92	struct v4l2_ctrl_handler ctrl_handler;
 93
 94	/* Saved register values */
 95	u64 pre_isp;
 96};
 97
 98static const struct cci_reg_sequence ov6211_400x400_120fps_mode[] = {
 99	{ CCI_REG8(0x3005), 0x00 },
100	{ CCI_REG8(0x3013), 0x12 },
101	{ CCI_REG8(0x3014), 0x04 },
102	{ CCI_REG8(0x3016), 0x10 },
103	{ CCI_REG8(0x3017), 0x00 },
104	{ CCI_REG8(0x3018), 0x00 },
105	{ CCI_REG8(0x301a), 0x00 },
106	{ CCI_REG8(0x301b), 0x00 },
107	{ CCI_REG8(0x301c), 0x00 },
108	{ CCI_REG8(0x3037), 0xf0 },
109	{ CCI_REG8(0x3080), 0x01 },
110	{ CCI_REG8(0x3081), 0x00 },
111	{ CCI_REG8(0x3082), 0x01 },
112	{ CCI_REG8(0x3098), 0x04 },
113	{ CCI_REG8(0x3099), 0x28 },
114	{ CCI_REG8(0x309a), 0x06 },
115	{ CCI_REG8(0x309b), 0x04 },
116	{ CCI_REG8(0x309c), 0x00 },
117	{ CCI_REG8(0x309d), 0x00 },
118	{ CCI_REG8(0x309e), 0x01 },
119	{ CCI_REG8(0x309f), 0x00 },
120	{ CCI_REG8(0x30b0), 0x08 },
121	{ CCI_REG8(0x30b1), 0x02 },
122	{ CCI_REG8(0x30b2), 0x00 },
123	{ CCI_REG8(0x30b3), 0x28 },
124	{ CCI_REG8(0x30b4), 0x02 },
125	{ CCI_REG8(0x30b5), 0x00 },
126	{ CCI_REG8(0x3106), 0xd9 },
127	{ CCI_REG8(0x3503), 0x07 },
128	{ CCI_REG8(0x3509), 0x10 },
129	{ CCI_REG8(0x3600), 0xfc },
130	{ CCI_REG8(0x3620), 0xb7 },
131	{ CCI_REG8(0x3621), 0x05 },
132	{ CCI_REG8(0x3626), 0x31 },
133	{ CCI_REG8(0x3627), 0x40 },
134	{ CCI_REG8(0x3632), 0xa3 },
135	{ CCI_REG8(0x3633), 0x34 },
136	{ CCI_REG8(0x3634), 0x40 },
137	{ CCI_REG8(0x3636), 0x00 },
138	{ CCI_REG8(0x3660), 0x80 },
139	{ CCI_REG8(0x3662), 0x03 },
140	{ CCI_REG8(0x3664), 0xf0 },
141	{ CCI_REG8(0x366a), 0x10 },
142	{ CCI_REG8(0x366b), 0x06 },
143	{ CCI_REG8(0x3680), 0xf4 },
144	{ CCI_REG8(0x3681), 0x50 },
145	{ CCI_REG8(0x3682), 0x00 },
146	{ CCI_REG8(0x3708), 0x20 },
147	{ CCI_REG8(0x3709), 0x40 },
148	{ CCI_REG8(0x370d), 0x03 },
149	{ CCI_REG8(0x373b), 0x02 },
150	{ CCI_REG8(0x373c), 0x08 },
151	{ CCI_REG8(0x3742), 0x00 },
152	{ CCI_REG8(0x3744), 0x16 },
153	{ CCI_REG8(0x3745), 0x08 },
154	{ CCI_REG8(0x3781), 0xfc },
155	{ CCI_REG8(0x3788), 0x00 },
156	{ CCI_REG8(0x3800), 0x00 },
157	{ CCI_REG8(0x3801), 0x04 },
158	{ CCI_REG8(0x3802), 0x00 },
159	{ CCI_REG8(0x3803), 0x04 },
160	{ CCI_REG8(0x3804), 0x01 },
161	{ CCI_REG8(0x3805), 0x9b },
162	{ CCI_REG8(0x3806), 0x01 },
163	{ CCI_REG8(0x3807), 0x9b },
164	{ CCI_REG8(0x3808), 0x01 },	/* output width */
165	{ CCI_REG8(0x3809), 0x90 },
166	{ CCI_REG8(0x380a), 0x01 },	/* output height */
167	{ CCI_REG8(0x380b), 0x90 },
168	{ CCI_REG8(0x380c), 0x05 },	/* horizontal timing size */
169	{ CCI_REG8(0x380d), 0xf2 },
170	{ CCI_REG8(0x380e), 0x01 },	/* vertical timing size */
171	{ CCI_REG8(0x380f), 0xb6 },
172	{ CCI_REG8(0x3810), 0x00 },
173	{ CCI_REG8(0x3811), 0x04 },
174	{ CCI_REG8(0x3812), 0x00 },
175	{ CCI_REG8(0x3813), 0x04 },
176	{ CCI_REG8(0x3814), 0x11 },
177	{ CCI_REG8(0x3815), 0x11 },
178	{ CCI_REG8(0x3820), 0x00 },
179	{ CCI_REG8(0x3821), 0x00 },
180	{ CCI_REG8(0x382b), 0xfa },
181	{ CCI_REG8(0x382f), 0x04 },
182	{ CCI_REG8(0x3832), 0x00 },
183	{ CCI_REG8(0x3833), 0x05 },
184	{ CCI_REG8(0x3834), 0x00 },
185	{ CCI_REG8(0x3835), 0x05 },
186	{ CCI_REG8(0x3882), 0x04 },
187	{ CCI_REG8(0x3883), 0x00 },
188	{ CCI_REG8(0x38a4), 0x10 },
189	{ CCI_REG8(0x38a5), 0x00 },
190	{ CCI_REG8(0x38b1), 0x03 },
191	{ CCI_REG8(0x3b80), 0x00 },
192	{ CCI_REG8(0x3b81), 0xff },
193	{ CCI_REG8(0x3b82), 0x10 },
194	{ CCI_REG8(0x3b83), 0x00 },
195	{ CCI_REG8(0x3b84), 0x08 },
196	{ CCI_REG8(0x3b85), 0x00 },
197	{ CCI_REG8(0x3b86), 0x01 },
198	{ CCI_REG8(0x3b87), 0x00 },
199	{ CCI_REG8(0x3b88), 0x00 },
200	{ CCI_REG8(0x3b89), 0x00 },
201	{ CCI_REG8(0x3b8a), 0x00 },
202	{ CCI_REG8(0x3b8b), 0x05 },
203	{ CCI_REG8(0x3b8c), 0x00 },
204	{ CCI_REG8(0x3b8d), 0x00 },
205	{ CCI_REG8(0x3b8e), 0x01 },
206	{ CCI_REG8(0x3b8f), 0xb2 },
207	{ CCI_REG8(0x3b94), 0x05 },
208	{ CCI_REG8(0x3b95), 0xf2 },
209	{ CCI_REG8(0x3b96), 0xc0 },
210	{ CCI_REG8(0x4004), 0x04 },
211	{ CCI_REG8(0x404e), 0x01 },
212	{ CCI_REG8(0x4801), 0x0f },
213	{ CCI_REG8(0x4806), 0x0f },
214	{ CCI_REG8(0x4837), 0x43 },
215	{ CCI_REG8(0x5a08), 0x00 },
216	{ CCI_REG8(0x5a01), 0x00 },
217	{ CCI_REG8(0x5a03), 0x00 },
218	{ CCI_REG8(0x5a04), 0x10 },
219	{ CCI_REG8(0x5a05), 0xa0 },
220	{ CCI_REG8(0x5a06), 0x0c },
221	{ CCI_REG8(0x5a07), 0x78 },
222};
223
224static const struct ov6211_mode supported_modes[] = {
225	{
226		.width = 400,
227		.height = 400,
228		.hts = 1522,
229		.vts = 438,
230		.bpp = 8,
231		.reg_list = {
232			.regs = ov6211_400x400_120fps_mode,
233			.num_regs = ARRAY_SIZE(ov6211_400x400_120fps_mode),
234		},
235	},
236};
237
238static int ov6211_set_test_pattern(struct ov6211 *ov6211, u32 pattern)
239{
240	u64 val = ov6211->pre_isp;
241
242	if (pattern)
243		val |= OV6211_TEST_PATTERN_ENABLE;
244	else
245		val &= ~OV6211_TEST_PATTERN_ENABLE;
246
247	return cci_write(ov6211->regmap, OV6211_REG_PRE_ISP, val, NULL);
248}
249
250static int ov6211_set_ctrl(struct v4l2_ctrl *ctrl)
251{
252	struct ov6211 *ov6211 = container_of(ctrl->handler, struct ov6211,
253					     ctrl_handler);
254	int ret;
255
256	/* V4L2 controls are applied, when sensor is powered up for streaming */
257	if (!pm_runtime_get_if_active(ov6211->dev))
258		return 0;
259
260	switch (ctrl->id) {
261	case V4L2_CID_ANALOGUE_GAIN:
262		ret = cci_write(ov6211->regmap, OV6211_REG_ANALOGUE_GAIN,
263				ctrl->val, NULL);
264		break;
265	case V4L2_CID_EXPOSURE:
266		ret = cci_write(ov6211->regmap, OV6211_REG_EXPOSURE,
267				ctrl->val << 4, NULL);
268		break;
269	case V4L2_CID_TEST_PATTERN:
270		ret = ov6211_set_test_pattern(ov6211, ctrl->val);
271		break;
272	default:
273		ret = -EINVAL;
274		break;
275	}
276
277	pm_runtime_put(ov6211->dev);
278
279	return ret;
280}
281
282static const struct v4l2_ctrl_ops ov6211_ctrl_ops = {
283	.s_ctrl = ov6211_set_ctrl,
284};
285
286static int ov6211_init_controls(struct ov6211 *ov6211)
287{
288	struct v4l2_ctrl_handler *ctrl_hdlr = &ov6211->ctrl_handler;
289	const struct ov6211_mode *mode = &supported_modes[0];
290	struct v4l2_fwnode_device_properties props;
291	s64 exposure_max, pixel_rate, h_blank;
292	struct v4l2_ctrl *ctrl;
293	int ret;
294
295	v4l2_ctrl_handler_init(ctrl_hdlr, 9);
296
297	ctrl = v4l2_ctrl_new_int_menu(ctrl_hdlr, &ov6211_ctrl_ops,
298				      V4L2_CID_LINK_FREQ,
299				      ARRAY_SIZE(ov6211_link_freq_menu) - 1,
300				      0, ov6211_link_freq_menu);
301	if (ctrl)
302		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
303
304	pixel_rate = ov6211_link_freq_menu[0] / mode->bpp;
305	v4l2_ctrl_new_std(ctrl_hdlr, &ov6211_ctrl_ops, V4L2_CID_PIXEL_RATE,
306			  0, pixel_rate, 1, pixel_rate);
307
308	h_blank = mode->hts - mode->width;
309	ctrl = v4l2_ctrl_new_std(ctrl_hdlr, &ov6211_ctrl_ops, V4L2_CID_HBLANK,
310				 h_blank, h_blank, 1, h_blank);
311	if (ctrl)
312		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
313
314	ctrl = v4l2_ctrl_new_std(ctrl_hdlr, &ov6211_ctrl_ops, V4L2_CID_VBLANK,
315				 mode->vts - mode->height,
316				 mode->vts - mode->height, 1,
317				 mode->vts - mode->height);
318	if (ctrl)
319		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
320
321	v4l2_ctrl_new_std(ctrl_hdlr, &ov6211_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
322			  OV6211_ANALOGUE_GAIN_MIN, OV6211_ANALOGUE_GAIN_MAX,
323			  OV6211_ANALOGUE_GAIN_STEP,
324			  OV6211_ANALOGUE_GAIN_DEFAULT);
325
326	exposure_max = (mode->vts - OV6211_EXPOSURE_MAX_MARGIN);
327	v4l2_ctrl_new_std(ctrl_hdlr, &ov6211_ctrl_ops,
328			  V4L2_CID_EXPOSURE,
329			  OV6211_EXPOSURE_MIN, exposure_max,
330			  OV6211_EXPOSURE_STEP,
331			  OV6211_EXPOSURE_DEFAULT);
332
333	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &ov6211_ctrl_ops,
334				     V4L2_CID_TEST_PATTERN,
335				     ARRAY_SIZE(ov6211_test_pattern_menu) - 1,
336				     0, 0, ov6211_test_pattern_menu);
337
338	if (ctrl_hdlr->error)
339		return ctrl_hdlr->error;
340
341	ret = v4l2_fwnode_device_parse(ov6211->dev, &props);
342	if (ret)
343		goto error_free_hdlr;
344
345	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &ov6211_ctrl_ops,
346					      &props);
347	if (ret)
348		goto error_free_hdlr;
349
350	ov6211->sd.ctrl_handler = ctrl_hdlr;
351
352	return 0;
353
354error_free_hdlr:
355	v4l2_ctrl_handler_free(ctrl_hdlr);
356
357	return ret;
358}
359
360static void ov6211_update_pad_format(const struct ov6211_mode *mode,
361				     struct v4l2_mbus_framefmt *fmt)
362{
363	fmt->code = MEDIA_BUS_FMT_Y8_1X8;
364	fmt->width = mode->width;
365	fmt->height = mode->height;
366	fmt->field = V4L2_FIELD_NONE;
367	fmt->colorspace = V4L2_COLORSPACE_RAW;
368	fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
369	fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
370	fmt->xfer_func = V4L2_XFER_FUNC_NONE;
371}
372
373static int ov6211_enable_streams(struct v4l2_subdev *sd,
374				 struct v4l2_subdev_state *state, u32 pad,
375				 u64 streams_mask)
376{
377	const struct ov6211_reg_list *reg_list = &supported_modes[0].reg_list;
378	struct ov6211 *ov6211 = to_ov6211(sd);
379	int ret;
380
381	ret = pm_runtime_resume_and_get(ov6211->dev);
382	if (ret)
383		return ret;
384
385	/* Skip a step of explicit entering into the standby mode */
386	ret = cci_write(ov6211->regmap, OV6211_REG_SOFTWARE_RST,
387			OV6211_SOFTWARE_RST, NULL);
388	if (ret) {
389		dev_err(ov6211->dev, "failed to software reset: %d\n", ret);
390		goto error;
391	}
392
393	ret = cci_multi_reg_write(ov6211->regmap, reg_list->regs,
394				  reg_list->num_regs, NULL);
395	if (ret) {
396		dev_err(ov6211->dev, "failed to set mode: %d\n", ret);
397		goto error;
398	}
399
400	ret = __v4l2_ctrl_handler_setup(ov6211->sd.ctrl_handler);
401	if (ret)
402		goto error;
403
404	ret = cci_write(ov6211->regmap, OV6211_REG_MODE_SELECT,
405			OV6211_MODE_STREAMING, NULL);
406	if (ret) {
407		dev_err(ov6211->dev, "failed to start streaming: %d\n", ret);
408		goto error;
409	}
410
411	return 0;
412
413error:
414	pm_runtime_put_autosuspend(ov6211->dev);
415
416	return ret;
417}
418
419static int ov6211_disable_streams(struct v4l2_subdev *sd,
420				  struct v4l2_subdev_state *state, u32 pad,
421				  u64 streams_mask)
422{
423	struct ov6211 *ov6211 = to_ov6211(sd);
424	int ret;
425
426	ret = cci_write(ov6211->regmap, OV6211_REG_MODE_SELECT,
427			OV6211_MODE_STANDBY, NULL);
428	if (ret)
429		dev_err(ov6211->dev, "failed to stop streaming: %d\n", ret);
430
431	pm_runtime_put_autosuspend(ov6211->dev);
432
433	return ret;
434}
435
436static int ov6211_set_pad_format(struct v4l2_subdev *sd,
437				 struct v4l2_subdev_state *state,
438				 struct v4l2_subdev_format *fmt)
439{
440	struct v4l2_mbus_framefmt *format;
441	const struct ov6211_mode *mode;
442
443	format = v4l2_subdev_state_get_format(state, 0);
444
445	mode = v4l2_find_nearest_size(supported_modes,
446				      ARRAY_SIZE(supported_modes),
447				      width, height,
448				      fmt->format.width,
449				      fmt->format.height);
450
451	ov6211_update_pad_format(mode, &fmt->format);
452	*format = fmt->format;
453
454	return 0;
455}
456
457static int ov6211_enum_mbus_code(struct v4l2_subdev *sd,
458				 struct v4l2_subdev_state *sd_state,
459				 struct v4l2_subdev_mbus_code_enum *code)
460{
461	if (code->index > 0)
462		return -EINVAL;
463
464	code->code = MEDIA_BUS_FMT_Y8_1X8;
465
466	return 0;
467}
468
469static int ov6211_enum_frame_size(struct v4l2_subdev *sd,
470				  struct v4l2_subdev_state *sd_state,
471				  struct v4l2_subdev_frame_size_enum *fse)
472{
473	if (fse->index >= ARRAY_SIZE(supported_modes))
474		return -EINVAL;
475
476	if (fse->code != MEDIA_BUS_FMT_Y8_1X8)
477		return -EINVAL;
478
479	fse->min_width = supported_modes[fse->index].width;
480	fse->max_width = fse->min_width;
481	fse->min_height = supported_modes[fse->index].height;
482	fse->max_height = fse->min_height;
483
484	return 0;
485}
486
487static int ov6211_init_state(struct v4l2_subdev *sd,
488			     struct v4l2_subdev_state *state)
489{
490	struct v4l2_subdev_format fmt = {
491		.which = V4L2_SUBDEV_FORMAT_TRY,
492		.pad = 0,
493		.format = {
494			.code = MEDIA_BUS_FMT_Y8_1X8,
495			.width = supported_modes[0].width,
496			.height = supported_modes[0].height,
497		},
498	};
499
500	ov6211_set_pad_format(sd, state, &fmt);
501
502	return 0;
503}
504
505static const struct v4l2_subdev_video_ops ov6211_video_ops = {
506	.s_stream = v4l2_subdev_s_stream_helper,
507};
508
509static const struct v4l2_subdev_pad_ops ov6211_pad_ops = {
510	.set_fmt = ov6211_set_pad_format,
511	.get_fmt = v4l2_subdev_get_fmt,
512	.enum_mbus_code = ov6211_enum_mbus_code,
513	.enum_frame_size = ov6211_enum_frame_size,
514	.enable_streams = ov6211_enable_streams,
515	.disable_streams = ov6211_disable_streams,
516};
517
518static const struct v4l2_subdev_ops ov6211_subdev_ops = {
519	.video = &ov6211_video_ops,
520	.pad = &ov6211_pad_ops,
521};
522
523static const struct v4l2_subdev_internal_ops ov6211_internal_ops = {
524	.init_state = ov6211_init_state,
525};
526
527static const struct media_entity_operations ov6211_subdev_entity_ops = {
528	.link_validate = v4l2_subdev_link_validate,
529};
530
531static int ov6211_identify_sensor(struct ov6211 *ov6211)
532{
533	u64 val;
534	int ret;
535
536	ret = cci_read(ov6211->regmap, OV6211_REG_CHIP_ID, &val, NULL);
537	if (ret) {
538		dev_err(ov6211->dev, "failed to read chip id: %d\n", ret);
539		return ret;
540	}
541
542	if (val != OV6211_CHIP_ID) {
543		dev_err(ov6211->dev, "chip id mismatch: %x!=%llx\n",
544			OV6211_CHIP_ID, val);
545		return -ENODEV;
546	}
547
548	ret = cci_read(ov6211->regmap, OV6211_REG_PRE_ISP,
549		       &ov6211->pre_isp, NULL);
550	if (ret)
551		dev_err(ov6211->dev, "failed to read pre_isp: %d\n", ret);
552
553	return ret;
554}
555
556static int ov6211_check_hwcfg(struct ov6211 *ov6211)
557{
558	struct fwnode_handle *fwnode = dev_fwnode(ov6211->dev), *ep;
559	struct v4l2_fwnode_endpoint bus_cfg = {
560		.bus_type = V4L2_MBUS_CSI2_DPHY,
561	};
562	unsigned long freq_bitmap;
563	int ret;
564
565	if (!fwnode)
566		return -ENODEV;
567
568	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
569	if (!ep)
570		return -EINVAL;
571
572	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
573	fwnode_handle_put(ep);
574	if (ret)
575		return ret;
576
577	ret = v4l2_link_freq_to_bitmap(ov6211->dev, bus_cfg.link_frequencies,
578				       bus_cfg.nr_of_link_frequencies,
579				       ov6211_link_freq_menu,
580				       ARRAY_SIZE(ov6211_link_freq_menu),
581				       &freq_bitmap);
582
583	v4l2_fwnode_endpoint_free(&bus_cfg);
584
585	return ret;
586}
587
588static int ov6211_power_on(struct device *dev)
589{
590	struct v4l2_subdev *sd = dev_get_drvdata(dev);
591	struct ov6211 *ov6211 = to_ov6211(sd);
592	int ret;
593
594	ret = regulator_bulk_enable(OV6211_NUM_SUPPLIES, ov6211->supplies);
595	if (ret)
596		return ret;
597
598	gpiod_set_value_cansleep(ov6211->reset_gpio, 0);
599	usleep_range(10 * USEC_PER_MSEC, 15 * USEC_PER_MSEC);
600
601	ret = clk_prepare_enable(ov6211->xvclk);
602	if (ret)
603		goto reset_gpio;
604
605	return 0;
606
607reset_gpio:
608	gpiod_set_value_cansleep(ov6211->reset_gpio, 1);
609
610	regulator_bulk_disable(OV6211_NUM_SUPPLIES, ov6211->supplies);
611
612	return ret;
613}
614
615static int ov6211_power_off(struct device *dev)
616{
617	struct v4l2_subdev *sd = dev_get_drvdata(dev);
618	struct ov6211 *ov6211 = to_ov6211(sd);
619
620	clk_disable_unprepare(ov6211->xvclk);
621
622	gpiod_set_value_cansleep(ov6211->reset_gpio, 1);
623
624	regulator_bulk_disable(OV6211_NUM_SUPPLIES, ov6211->supplies);
625
626	return 0;
627}
628
629static int ov6211_probe(struct i2c_client *client)
630{
631	struct ov6211 *ov6211;
632	unsigned long freq;
633	unsigned int i;
634	int ret;
635
636	ov6211 = devm_kzalloc(&client->dev, sizeof(*ov6211), GFP_KERNEL);
637	if (!ov6211)
638		return -ENOMEM;
639
640	ov6211->dev = &client->dev;
641
642	v4l2_i2c_subdev_init(&ov6211->sd, client, &ov6211_subdev_ops);
643
644	ov6211->regmap = devm_cci_regmap_init_i2c(client, 16);
645	if (IS_ERR(ov6211->regmap))
646		return dev_err_probe(ov6211->dev, PTR_ERR(ov6211->regmap),
647				     "failed to init CCI\n");
648
649	ov6211->xvclk = devm_v4l2_sensor_clk_get(ov6211->dev, NULL);
650	if (IS_ERR(ov6211->xvclk))
651		return dev_err_probe(ov6211->dev, PTR_ERR(ov6211->xvclk),
652				     "failed to get XVCLK clock\n");
653
654	freq = clk_get_rate(ov6211->xvclk);
655	if (freq && freq != OV6211_MCLK_FREQ_24MHZ)
656		return dev_err_probe(ov6211->dev, -EINVAL,
657				     "XVCLK clock frequency %lu is not supported\n",
658				     freq);
659
660	ret = ov6211_check_hwcfg(ov6211);
661	if (ret)
662		return dev_err_probe(ov6211->dev, ret,
663				     "failed to check HW configuration\n");
664
665	ov6211->reset_gpio = devm_gpiod_get_optional(ov6211->dev, "reset",
666						     GPIOD_OUT_HIGH);
667	if (IS_ERR(ov6211->reset_gpio))
668		return dev_err_probe(ov6211->dev, PTR_ERR(ov6211->reset_gpio),
669				     "cannot get reset GPIO\n");
670
671	for (i = 0; i < OV6211_NUM_SUPPLIES; i++)
672		ov6211->supplies[i].supply = ov6211_supply_names[i];
673
674	ret = devm_regulator_bulk_get(ov6211->dev, OV6211_NUM_SUPPLIES,
675				      ov6211->supplies);
676	if (ret)
677		return dev_err_probe(ov6211->dev, ret,
678				     "failed to get supply regulators\n");
679
680	/* The sensor must be powered on to read the CHIP_ID register */
681	ret = ov6211_power_on(ov6211->dev);
682	if (ret)
683		return ret;
684
685	ret = ov6211_identify_sensor(ov6211);
686	if (ret) {
687		dev_err_probe(ov6211->dev, ret, "failed to find sensor\n");
688		goto power_off;
689	}
690
691	ret = ov6211_init_controls(ov6211);
692	if (ret) {
693		dev_err_probe(ov6211->dev, ret, "failed to init controls\n");
694		goto power_off;
695	}
696
697	ov6211->sd.state_lock = ov6211->ctrl_handler.lock;
698	ov6211->sd.internal_ops = &ov6211_internal_ops;
699	ov6211->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
700	ov6211->sd.entity.ops = &ov6211_subdev_entity_ops;
701	ov6211->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
702	ov6211->pad.flags = MEDIA_PAD_FL_SOURCE;
703
704	ret = media_entity_pads_init(&ov6211->sd.entity, 1, &ov6211->pad);
705	if (ret) {
706		dev_err_probe(ov6211->dev, ret,
707			      "failed to init media entity pads\n");
708		goto v4l2_ctrl_handler_free;
709	}
710
711	ret = v4l2_subdev_init_finalize(&ov6211->sd);
712	if (ret < 0) {
713		dev_err_probe(ov6211->dev, ret,
714			      "failed to init media entity pads\n");
715		goto media_entity_cleanup;
716	}
717
718	pm_runtime_set_active(ov6211->dev);
719	pm_runtime_enable(ov6211->dev);
720
721	ret = v4l2_async_register_subdev_sensor(&ov6211->sd);
722	if (ret < 0) {
723		dev_err_probe(ov6211->dev, ret,
724			      "failed to register V4L2 subdev\n");
725		goto subdev_cleanup;
726	}
727
728	/* Enable runtime PM and turn off the device */
729	pm_runtime_idle(ov6211->dev);
730	pm_runtime_set_autosuspend_delay(ov6211->dev, 1000);
731	pm_runtime_use_autosuspend(ov6211->dev);
732
733	return 0;
734
735subdev_cleanup:
736	v4l2_subdev_cleanup(&ov6211->sd);
737	pm_runtime_disable(ov6211->dev);
738	pm_runtime_set_suspended(ov6211->dev);
739
740media_entity_cleanup:
741	media_entity_cleanup(&ov6211->sd.entity);
742
743v4l2_ctrl_handler_free:
744	v4l2_ctrl_handler_free(ov6211->sd.ctrl_handler);
745
746power_off:
747	ov6211_power_off(ov6211->dev);
748
749	return ret;
750}
751
752static void ov6211_remove(struct i2c_client *client)
753{
754	struct v4l2_subdev *sd = i2c_get_clientdata(client);
755	struct ov6211 *ov6211 = to_ov6211(sd);
756
757	v4l2_async_unregister_subdev(sd);
758	v4l2_subdev_cleanup(sd);
759	media_entity_cleanup(&sd->entity);
760	v4l2_ctrl_handler_free(sd->ctrl_handler);
761	pm_runtime_disable(ov6211->dev);
762
763	if (!pm_runtime_status_suspended(ov6211->dev)) {
764		ov6211_power_off(ov6211->dev);
765		pm_runtime_set_suspended(ov6211->dev);
766	}
767}
768
769static const struct dev_pm_ops ov6211_pm_ops = {
770	SET_RUNTIME_PM_OPS(ov6211_power_off, ov6211_power_on, NULL)
771};
772
773static const struct of_device_id ov6211_of_match[] = {
774	{ .compatible = "ovti,ov6211" },
775	{ /* sentinel */ }
776};
777MODULE_DEVICE_TABLE(of, ov6211_of_match);
778
779static struct i2c_driver ov6211_i2c_driver = {
780	.driver = {
781		.name = "ov6211",
782		.pm = &ov6211_pm_ops,
783		.of_match_table = ov6211_of_match,
784	},
785	.probe = ov6211_probe,
786	.remove = ov6211_remove,
787};
788
789module_i2c_driver(ov6211_i2c_driver);
790
791MODULE_AUTHOR("Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>");
792MODULE_DESCRIPTION("OmniVision OV6211 sensor driver");
793MODULE_LICENSE("GPL");