xref: /openbmc/linux/sound/soc/uniphier/aio-cpu.c (revision a2818ee4) 
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Socionext UniPhier AIO ALSA CPU DAI driver.
4 //
5 // Copyright (c) 2016-2018 Socionext Inc.
6 
7 #include <linux/clk.h>
8 #include <linux/errno.h>
9 #include <linux/kernel.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_platform.h>
14 #include <linux/platform_device.h>
15 #include <linux/reset.h>
16 #include <sound/core.h>
17 #include <sound/pcm.h>
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20 
21 #include "aio.h"
22 
23 static bool is_valid_pll(struct uniphier_aio_chip *chip, int pll_id)
24 {
25 	struct device *dev = &chip->pdev->dev;
26 
27 	if (pll_id < 0 || chip->num_plls <= pll_id) {
28 		dev_err(dev, "PLL(%d) is not supported\n", pll_id);
29 		return false;
30 	}
31 
32 	return chip->plls[pll_id].enable;
33 }
34 
35 /**
36  * find_volume - find volume supported HW port by HW port number
37  * @chip: the AIO chip pointer
38  * @oport_hw: HW port number, one of AUD_HW_XXXX
39  *
40  * Find AIO device from device list by HW port number. Volume feature is
41  * available only in Output and PCM ports, this limitation comes from HW
42  * specifications.
43  *
44  * Return: The pointer of AIO substream if successful, otherwise NULL on error.
45  */
46 static struct uniphier_aio_sub *find_volume(struct uniphier_aio_chip *chip,
47 					    int oport_hw)
48 {
49 	int i;
50 
51 	for (i = 0; i < chip->num_aios; i++) {
52 		struct uniphier_aio_sub *sub = &chip->aios[i].sub[0];
53 
54 		if (!sub->swm)
55 			continue;
56 
57 		if (sub->swm->oport.hw == oport_hw)
58 			return sub;
59 	}
60 
61 	return NULL;
62 }
63 
64 static bool match_spec(const struct uniphier_aio_spec *spec,
65 		       const char *name, int dir)
66 {
67 	if (dir == SNDRV_PCM_STREAM_PLAYBACK &&
68 	    spec->swm.dir != PORT_DIR_OUTPUT) {
69 		return false;
70 	}
71 
72 	if (dir == SNDRV_PCM_STREAM_CAPTURE &&
73 	    spec->swm.dir != PORT_DIR_INPUT) {
74 		return false;
75 	}
76 
77 	if (spec->name && strcmp(spec->name, name) == 0)
78 		return true;
79 
80 	if (spec->gname && strcmp(spec->gname, name) == 0)
81 		return true;
82 
83 	return false;
84 }
85 
86 /**
87  * find_spec - find HW specification info by name
88  * @aio: the AIO device pointer
89  * @name: name of device
90  * @direction: the direction of substream, SNDRV_PCM_STREAM_*
91  *
92  * Find hardware specification information from list by device name. This
93  * information is used for telling the difference of SoCs to driver.
94  *
95  * Specification list is array of 'struct uniphier_aio_spec' which is defined
96  * in each drivers (see: aio-i2s.c).
97  *
98  * Return: The pointer of hardware specification of AIO if successful,
99  * otherwise NULL on error.
100  */
101 static const struct uniphier_aio_spec *find_spec(struct uniphier_aio *aio,
102 						 const char *name,
103 						 int direction)
104 {
105 	const struct uniphier_aio_chip_spec *chip_spec = aio->chip->chip_spec;
106 	int i;
107 
108 	for (i = 0; i < chip_spec->num_specs; i++) {
109 		const struct uniphier_aio_spec *spec = &chip_spec->specs[i];
110 
111 		if (match_spec(spec, name, direction))
112 			return spec;
113 	}
114 
115 	return NULL;
116 }
117 
118 /**
119  * find_divider - find clock divider by frequency
120  * @aio: the AIO device pointer
121  * @pll_id: PLL ID, should be AUD_PLL_XX
122  * @freq: required frequency
123  *
124  * Find suitable clock divider by frequency.
125  *
126  * Return: The ID of PLL if successful, otherwise negative error value.
127  */
128 static int find_divider(struct uniphier_aio *aio, int pll_id, unsigned int freq)
129 {
130 	struct uniphier_aio_pll *pll;
131 	int mul[] = { 1, 1, 1, 2, };
132 	int div[] = { 2, 3, 1, 3, };
133 	int i;
134 
135 	if (!is_valid_pll(aio->chip, pll_id))
136 		return -EINVAL;
137 
138 	pll = &aio->chip->plls[pll_id];
139 	for (i = 0; i < ARRAY_SIZE(mul); i++)
140 		if (pll->freq * mul[i] / div[i] == freq)
141 			return i;
142 
143 	return -ENOTSUPP;
144 }
145 
146 static int uniphier_aio_set_sysclk(struct snd_soc_dai *dai, int clk_id,
147 				   unsigned int freq, int dir)
148 {
149 	struct uniphier_aio *aio = uniphier_priv(dai);
150 	struct device *dev = &aio->chip->pdev->dev;
151 	bool pll_auto = false;
152 	int pll_id, div_id;
153 
154 	switch (clk_id) {
155 	case AUD_CLK_IO:
156 		return -ENOTSUPP;
157 	case AUD_CLK_A1:
158 		pll_id = AUD_PLL_A1;
159 		break;
160 	case AUD_CLK_F1:
161 		pll_id = AUD_PLL_F1;
162 		break;
163 	case AUD_CLK_A2:
164 		pll_id = AUD_PLL_A2;
165 		break;
166 	case AUD_CLK_F2:
167 		pll_id = AUD_PLL_F2;
168 		break;
169 	case AUD_CLK_A:
170 		pll_id = AUD_PLL_A1;
171 		pll_auto = true;
172 		break;
173 	case AUD_CLK_F:
174 		pll_id = AUD_PLL_F1;
175 		pll_auto = true;
176 		break;
177 	case AUD_CLK_APLL:
178 		pll_id = AUD_PLL_APLL;
179 		break;
180 	case AUD_CLK_RX0:
181 		pll_id = AUD_PLL_RX0;
182 		break;
183 	case AUD_CLK_USB0:
184 		pll_id = AUD_PLL_USB0;
185 		break;
186 	case AUD_CLK_HSC0:
187 		pll_id = AUD_PLL_HSC0;
188 		break;
189 	default:
190 		dev_err(dev, "Sysclk(%d) is not supported\n", clk_id);
191 		return -EINVAL;
192 	}
193 
194 	if (pll_auto) {
195 		for (pll_id = 0; pll_id < aio->chip->num_plls; pll_id++) {
196 			div_id = find_divider(aio, pll_id, freq);
197 			if (div_id >= 0) {
198 				aio->plldiv = div_id;
199 				break;
200 			}
201 		}
202 		if (pll_id == aio->chip->num_plls) {
203 			dev_err(dev, "Sysclk frequency is not supported(%d)\n",
204 				freq);
205 			return -EINVAL;
206 		}
207 	}
208 
209 	if (dir == SND_SOC_CLOCK_OUT)
210 		aio->pll_out = pll_id;
211 	else
212 		aio->pll_in = pll_id;
213 
214 	return 0;
215 }
216 
217 static int uniphier_aio_set_pll(struct snd_soc_dai *dai, int pll_id,
218 				int source, unsigned int freq_in,
219 				unsigned int freq_out)
220 {
221 	struct uniphier_aio *aio = uniphier_priv(dai);
222 	int ret;
223 
224 	if (!is_valid_pll(aio->chip, pll_id))
225 		return -EINVAL;
226 
227 	ret = aio_chip_set_pll(aio->chip, pll_id, freq_out);
228 	if (ret < 0)
229 		return ret;
230 
231 	return 0;
232 }
233 
234 static int uniphier_aio_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
235 {
236 	struct uniphier_aio *aio = uniphier_priv(dai);
237 	struct device *dev = &aio->chip->pdev->dev;
238 
239 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
240 	case SND_SOC_DAIFMT_LEFT_J:
241 	case SND_SOC_DAIFMT_RIGHT_J:
242 	case SND_SOC_DAIFMT_I2S:
243 		aio->fmt = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
244 		break;
245 	default:
246 		dev_err(dev, "Format is not supported(%d)\n",
247 			fmt & SND_SOC_DAIFMT_FORMAT_MASK);
248 		return -EINVAL;
249 	}
250 
251 	return 0;
252 }
253 
254 static int uniphier_aio_startup(struct snd_pcm_substream *substream,
255 				struct snd_soc_dai *dai)
256 {
257 	struct uniphier_aio *aio = uniphier_priv(dai);
258 	struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
259 	int ret;
260 
261 	sub->substream = substream;
262 	sub->pass_through = 0;
263 	sub->use_mmap = true;
264 
265 	ret = aio_init(sub);
266 	if (ret)
267 		return ret;
268 
269 	return 0;
270 }
271 
272 static void uniphier_aio_shutdown(struct snd_pcm_substream *substream,
273 				  struct snd_soc_dai *dai)
274 {
275 	struct uniphier_aio *aio = uniphier_priv(dai);
276 	struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
277 
278 	sub->substream = NULL;
279 }
280 
281 static int uniphier_aio_hw_params(struct snd_pcm_substream *substream,
282 				  struct snd_pcm_hw_params *params,
283 				  struct snd_soc_dai *dai)
284 {
285 	struct uniphier_aio *aio = uniphier_priv(dai);
286 	struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
287 	struct device *dev = &aio->chip->pdev->dev;
288 	int freq, ret;
289 
290 	switch (params_rate(params)) {
291 	case 48000:
292 	case 32000:
293 	case 24000:
294 		freq = 12288000;
295 		break;
296 	case 44100:
297 	case 22050:
298 		freq = 11289600;
299 		break;
300 	default:
301 		dev_err(dev, "Rate is not supported(%d)\n",
302 			params_rate(params));
303 		return -EINVAL;
304 	}
305 	ret = snd_soc_dai_set_sysclk(dai, AUD_CLK_A,
306 				     freq, SND_SOC_CLOCK_OUT);
307 	if (ret)
308 		return ret;
309 
310 	sub->params = *params;
311 	sub->setting = 1;
312 
313 	aio_port_reset(sub);
314 	aio_port_set_volume(sub, sub->vol);
315 	aio_src_reset(sub);
316 
317 	return 0;
318 }
319 
320 static int uniphier_aio_hw_free(struct snd_pcm_substream *substream,
321 				struct snd_soc_dai *dai)
322 {
323 	struct uniphier_aio *aio = uniphier_priv(dai);
324 	struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
325 
326 	sub->setting = 0;
327 
328 	return 0;
329 }
330 
331 static int uniphier_aio_prepare(struct snd_pcm_substream *substream,
332 				struct snd_soc_dai *dai)
333 {
334 	struct uniphier_aio *aio = uniphier_priv(dai);
335 	struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
336 	int ret;
337 
338 	ret = aio_port_set_param(sub, sub->pass_through, &sub->params);
339 	if (ret)
340 		return ret;
341 	ret = aio_src_set_param(sub, &sub->params);
342 	if (ret)
343 		return ret;
344 	aio_port_set_enable(sub, 1);
345 
346 	ret = aio_if_set_param(sub, sub->pass_through);
347 	if (ret)
348 		return ret;
349 
350 	if (sub->swm->type == PORT_TYPE_CONV) {
351 		ret = aio_srcif_set_param(sub);
352 		if (ret)
353 			return ret;
354 		ret = aio_srcch_set_param(sub);
355 		if (ret)
356 			return ret;
357 		aio_srcch_set_enable(sub, 1);
358 	}
359 
360 	return 0;
361 }
362 
363 const struct snd_soc_dai_ops uniphier_aio_i2s_ops = {
364 	.set_sysclk  = uniphier_aio_set_sysclk,
365 	.set_pll     = uniphier_aio_set_pll,
366 	.set_fmt     = uniphier_aio_set_fmt,
367 	.startup     = uniphier_aio_startup,
368 	.shutdown    = uniphier_aio_shutdown,
369 	.hw_params   = uniphier_aio_hw_params,
370 	.hw_free     = uniphier_aio_hw_free,
371 	.prepare     = uniphier_aio_prepare,
372 };
373 EXPORT_SYMBOL_GPL(uniphier_aio_i2s_ops);
374 
375 const struct snd_soc_dai_ops uniphier_aio_spdif_ops = {
376 	.set_sysclk  = uniphier_aio_set_sysclk,
377 	.set_pll     = uniphier_aio_set_pll,
378 	.startup     = uniphier_aio_startup,
379 	.shutdown    = uniphier_aio_shutdown,
380 	.hw_params   = uniphier_aio_hw_params,
381 	.hw_free     = uniphier_aio_hw_free,
382 	.prepare     = uniphier_aio_prepare,
383 };
384 EXPORT_SYMBOL_GPL(uniphier_aio_spdif_ops);
385 
386 int uniphier_aio_dai_probe(struct snd_soc_dai *dai)
387 {
388 	struct uniphier_aio *aio = uniphier_priv(dai);
389 	int i;
390 
391 	for (i = 0; i < ARRAY_SIZE(aio->sub); i++) {
392 		struct uniphier_aio_sub *sub = &aio->sub[i];
393 		const struct uniphier_aio_spec *spec;
394 
395 		spec = find_spec(aio, dai->name, i);
396 		if (!spec)
397 			continue;
398 
399 		sub->swm = &spec->swm;
400 		sub->spec = spec;
401 
402 		sub->vol = AUD_VOL_INIT;
403 	}
404 
405 	aio_iecout_set_enable(aio->chip, true);
406 	aio_chip_init(aio->chip);
407 	aio->chip->active = 1;
408 
409 	return 0;
410 }
411 EXPORT_SYMBOL_GPL(uniphier_aio_dai_probe);
412 
413 int uniphier_aio_dai_remove(struct snd_soc_dai *dai)
414 {
415 	struct uniphier_aio *aio = uniphier_priv(dai);
416 
417 	aio->chip->active = 0;
418 
419 	return 0;
420 }
421 EXPORT_SYMBOL_GPL(uniphier_aio_dai_remove);
422 
423 int uniphier_aio_dai_suspend(struct snd_soc_dai *dai)
424 {
425 	struct uniphier_aio *aio = uniphier_priv(dai);
426 
427 	reset_control_assert(aio->chip->rst);
428 	clk_disable_unprepare(aio->chip->clk);
429 
430 	return 0;
431 }
432 EXPORT_SYMBOL_GPL(uniphier_aio_dai_suspend);
433 
434 int uniphier_aio_dai_resume(struct snd_soc_dai *dai)
435 {
436 	struct uniphier_aio *aio = uniphier_priv(dai);
437 	int ret, i;
438 
439 	if (!aio->chip->active)
440 		return 0;
441 
442 	ret = clk_prepare_enable(aio->chip->clk);
443 	if (ret)
444 		return ret;
445 
446 	ret = reset_control_deassert(aio->chip->rst);
447 	if (ret)
448 		goto err_out_clock;
449 
450 	aio_iecout_set_enable(aio->chip, true);
451 	aio_chip_init(aio->chip);
452 
453 	for (i = 0; i < ARRAY_SIZE(aio->sub); i++) {
454 		struct uniphier_aio_sub *sub = &aio->sub[i];
455 
456 		if (!sub->spec || !sub->substream)
457 			continue;
458 
459 		ret = aio_init(sub);
460 		if (ret)
461 			goto err_out_clock;
462 
463 		if (!sub->setting)
464 			continue;
465 
466 		aio_port_reset(sub);
467 		aio_src_reset(sub);
468 	}
469 
470 	return 0;
471 
472 err_out_clock:
473 	clk_disable_unprepare(aio->chip->clk);
474 
475 	return ret;
476 }
477 EXPORT_SYMBOL_GPL(uniphier_aio_dai_resume);
478 
479 static int uniphier_aio_vol_info(struct snd_kcontrol *kcontrol,
480 				 struct snd_ctl_elem_info *uinfo)
481 {
482 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
483 	uinfo->count = 1;
484 	uinfo->value.integer.min = 0;
485 	uinfo->value.integer.max = AUD_VOL_MAX;
486 
487 	return 0;
488 }
489 
490 static int uniphier_aio_vol_get(struct snd_kcontrol *kcontrol,
491 				struct snd_ctl_elem_value *ucontrol)
492 {
493 	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
494 	struct uniphier_aio_chip *chip = snd_soc_component_get_drvdata(comp);
495 	struct uniphier_aio_sub *sub;
496 	int oport_hw = kcontrol->private_value;
497 
498 	sub = find_volume(chip, oport_hw);
499 	if (!sub)
500 		return 0;
501 
502 	ucontrol->value.integer.value[0] = sub->vol;
503 
504 	return 0;
505 }
506 
507 static int uniphier_aio_vol_put(struct snd_kcontrol *kcontrol,
508 				struct snd_ctl_elem_value *ucontrol)
509 {
510 	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
511 	struct uniphier_aio_chip *chip = snd_soc_component_get_drvdata(comp);
512 	struct uniphier_aio_sub *sub;
513 	int oport_hw = kcontrol->private_value;
514 
515 	sub = find_volume(chip, oport_hw);
516 	if (!sub)
517 		return 0;
518 
519 	if (sub->vol == ucontrol->value.integer.value[0])
520 		return 0;
521 	sub->vol = ucontrol->value.integer.value[0];
522 
523 	aio_port_set_volume(sub, sub->vol);
524 
525 	return 0;
526 }
527 
528 static const struct snd_kcontrol_new uniphier_aio_controls[] = {
529 	{
530 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
531 		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
532 		.name = "HPCMOUT1 Volume",
533 		.info = uniphier_aio_vol_info,
534 		.get = uniphier_aio_vol_get,
535 		.put = uniphier_aio_vol_put,
536 		.private_value = AUD_HW_HPCMOUT1,
537 	},
538 	{
539 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
540 		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
541 		.name = "PCMOUT1 Volume",
542 		.info = uniphier_aio_vol_info,
543 		.get = uniphier_aio_vol_get,
544 		.put = uniphier_aio_vol_put,
545 		.private_value = AUD_HW_PCMOUT1,
546 	},
547 	{
548 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
549 		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
550 		.name = "PCMOUT2 Volume",
551 		.info = uniphier_aio_vol_info,
552 		.get = uniphier_aio_vol_get,
553 		.put = uniphier_aio_vol_put,
554 		.private_value = AUD_HW_PCMOUT2,
555 	},
556 	{
557 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
558 		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
559 		.name = "PCMOUT3 Volume",
560 		.info = uniphier_aio_vol_info,
561 		.get = uniphier_aio_vol_get,
562 		.put = uniphier_aio_vol_put,
563 		.private_value = AUD_HW_PCMOUT3,
564 	},
565 	{
566 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
567 		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
568 		.name = "HIECOUT1 Volume",
569 		.info = uniphier_aio_vol_info,
570 		.get = uniphier_aio_vol_get,
571 		.put = uniphier_aio_vol_put,
572 		.private_value = AUD_HW_HIECOUT1,
573 	},
574 	{
575 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
576 		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
577 		.name = "IECOUT1 Volume",
578 		.info = uniphier_aio_vol_info,
579 		.get = uniphier_aio_vol_get,
580 		.put = uniphier_aio_vol_put,
581 		.private_value = AUD_HW_IECOUT1,
582 	},
583 };
584 
585 static const struct snd_soc_component_driver uniphier_aio_component = {
586 	.name = "uniphier-aio",
587 	.controls = uniphier_aio_controls,
588 	.num_controls = ARRAY_SIZE(uniphier_aio_controls),
589 };
590 
591 int uniphier_aio_probe(struct platform_device *pdev)
592 {
593 	struct uniphier_aio_chip *chip;
594 	struct device *dev = &pdev->dev;
595 	int ret, i, j;
596 
597 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
598 	if (!chip)
599 		return -ENOMEM;
600 
601 	chip->chip_spec = of_device_get_match_data(dev);
602 	if (!chip->chip_spec)
603 		return -EINVAL;
604 
605 	chip->regmap_sg = syscon_regmap_lookup_by_phandle(dev->of_node,
606 							  "socionext,syscon");
607 	if (IS_ERR(chip->regmap_sg)) {
608 		if (PTR_ERR(chip->regmap_sg) == -EPROBE_DEFER)
609 			return -EPROBE_DEFER;
610 		chip->regmap_sg = NULL;
611 	}
612 
613 	chip->clk = devm_clk_get(dev, "aio");
614 	if (IS_ERR(chip->clk))
615 		return PTR_ERR(chip->clk);
616 
617 	chip->rst = devm_reset_control_get_shared(dev, "aio");
618 	if (IS_ERR(chip->rst))
619 		return PTR_ERR(chip->rst);
620 
621 	chip->num_aios = chip->chip_spec->num_dais;
622 	chip->aios = devm_kcalloc(dev,
623 				  chip->num_aios, sizeof(struct uniphier_aio),
624 				  GFP_KERNEL);
625 	if (!chip->aios)
626 		return -ENOMEM;
627 
628 	chip->num_plls = chip->chip_spec->num_plls;
629 	chip->plls = devm_kcalloc(dev,
630 				  chip->num_plls,
631 				  sizeof(struct uniphier_aio_pll),
632 				  GFP_KERNEL);
633 	if (!chip->plls)
634 		return -ENOMEM;
635 	memcpy(chip->plls, chip->chip_spec->plls,
636 	       sizeof(struct uniphier_aio_pll) * chip->num_plls);
637 
638 	for (i = 0; i < chip->num_aios; i++) {
639 		struct uniphier_aio *aio = &chip->aios[i];
640 
641 		aio->chip = chip;
642 		aio->fmt = SND_SOC_DAIFMT_I2S;
643 
644 		for (j = 0; j < ARRAY_SIZE(aio->sub); j++) {
645 			struct uniphier_aio_sub *sub = &aio->sub[j];
646 
647 			sub->aio = aio;
648 			spin_lock_init(&sub->lock);
649 		}
650 	}
651 
652 	chip->pdev = pdev;
653 	platform_set_drvdata(pdev, chip);
654 
655 	ret = clk_prepare_enable(chip->clk);
656 	if (ret)
657 		return ret;
658 
659 	ret = reset_control_deassert(chip->rst);
660 	if (ret)
661 		goto err_out_clock;
662 
663 	ret = devm_snd_soc_register_component(dev, &uniphier_aio_component,
664 					      chip->chip_spec->dais,
665 					      chip->chip_spec->num_dais);
666 	if (ret) {
667 		dev_err(dev, "Register component failed.\n");
668 		goto err_out_reset;
669 	}
670 
671 	ret = uniphier_aiodma_soc_register_platform(pdev);
672 	if (ret) {
673 		dev_err(dev, "Register platform failed.\n");
674 		goto err_out_reset;
675 	}
676 
677 	return 0;
678 
679 err_out_reset:
680 	reset_control_assert(chip->rst);
681 
682 err_out_clock:
683 	clk_disable_unprepare(chip->clk);
684 
685 	return ret;
686 }
687 EXPORT_SYMBOL_GPL(uniphier_aio_probe);
688 
689 int uniphier_aio_remove(struct platform_device *pdev)
690 {
691 	struct uniphier_aio_chip *chip = platform_get_drvdata(pdev);
692 
693 	reset_control_assert(chip->rst);
694 	clk_disable_unprepare(chip->clk);
695 
696 	return 0;
697 }
698 EXPORT_SYMBOL_GPL(uniphier_aio_remove);
699 
700 MODULE_AUTHOR("Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>");
701 MODULE_DESCRIPTION("UniPhier AIO CPU DAI driver.");
702 MODULE_LICENSE("GPL v2");
703