1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Rockchip PDM ALSA SoC Digital Audio Interface(DAI) driver
4 *
5 * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
6 */
7
8#include <linux/module.h>
9#include <linux/clk.h>
10#include <linux/of.h>
11#include <linux/pm_runtime.h>
12#include <linux/rational.h>
13#include <linux/regmap.h>
14#include <linux/reset.h>
15#include <sound/dmaengine_pcm.h>
16#include <sound/pcm_params.h>
17
18#include "rockchip_pdm.h"
19
20#define PDM_DMA_BURST_SIZE (8) /* size * width: 8*4 = 32 bytes */
21#define PDM_SIGNOFF_CLK_RATE (100000000)
22#define PDM_PATH_MAX (4)
23
24enum rk_pdm_version {
25 RK_PDM_RK3229,
26 RK_PDM_RK3308,
27 RK_PDM_RV1126,
28};
29
30struct rk_pdm_dev {
31 struct device *dev;
32 struct clk *clk;
33 struct clk *hclk;
34 struct regmap *regmap;
35 struct snd_dmaengine_dai_dma_data capture_dma_data;
36 struct reset_control *reset;
37 enum rk_pdm_version version;
38};
39
40struct rk_pdm_clkref {
41 unsigned int sr;
42 unsigned int clk;
43 unsigned int clk_out;
44};
45
46struct rk_pdm_ds_ratio {
47 unsigned int ratio;
48 unsigned int sr;
49};
50
51static struct rk_pdm_clkref clkref[] = {
52 { 8000, 40960000, 2048000 },
53 { 11025, 56448000, 2822400 },
54 { 12000, 61440000, 3072000 },
55 { 8000, 98304000, 2048000 },
56 { 12000, 98304000, 3072000 },
57};
58
59static struct rk_pdm_ds_ratio ds_ratio[] = {
60 { 0, 192000 },
61 { 0, 176400 },
62 { 0, 128000 },
63 { 1, 96000 },
64 { 1, 88200 },
65 { 1, 64000 },
66 { 2, 48000 },
67 { 2, 44100 },
68 { 2, 32000 },
69 { 3, 24000 },
70 { 3, 22050 },
71 { 3, 16000 },
72 { 4, 12000 },
73 { 4, 11025 },
74 { 4, 8000 },
75};
76
77static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
78 unsigned int *clk_src, unsigned int *clk_out)
79{
80 unsigned int i, count, clk, div, rate;
81
82 clk = 0;
83 if (!sr)
84 return clk;
85
86 count = ARRAY_SIZE(clkref);
87 for (i = 0; i < count; i++) {
88 if (sr % clkref[i].sr)
89 continue;
90 div = sr / clkref[i].sr;
91 if ((div & (div - 1)) == 0) {
92 *clk_out = clkref[i].clk_out;
93 rate = clk_round_rate(clk: pdm->clk, rate: clkref[i].clk);
94 if (rate != clkref[i].clk)
95 continue;
96 clk = clkref[i].clk;
97 *clk_src = clkref[i].clk;
98 break;
99 }
100 }
101
102 if (!clk) {
103 clk = clk_round_rate(clk: pdm->clk, PDM_SIGNOFF_CLK_RATE);
104 *clk_src = clk;
105 }
106 return clk;
107}
108
109static unsigned int get_pdm_ds_ratio(unsigned int sr)
110{
111 unsigned int i, count, ratio;
112
113 ratio = 0;
114 if (!sr)
115 return ratio;
116
117 count = ARRAY_SIZE(ds_ratio);
118 for (i = 0; i < count; i++) {
119 if (sr == ds_ratio[i].sr)
120 ratio = ds_ratio[i].ratio;
121 }
122 return ratio;
123}
124
125static unsigned int get_pdm_cic_ratio(unsigned int clk)
126{
127 switch (clk) {
128 case 4096000:
129 case 5644800:
130 case 6144000:
131 return 0;
132 case 2048000:
133 case 2822400:
134 case 3072000:
135 return 1;
136 case 1024000:
137 case 1411200:
138 case 1536000:
139 return 2;
140 default:
141 return 1;
142 }
143}
144
145static unsigned int samplerate_to_bit(unsigned int samplerate)
146{
147 switch (samplerate) {
148 case 8000:
149 case 11025:
150 case 12000:
151 return 0;
152 case 16000:
153 case 22050:
154 case 24000:
155 return 1;
156 case 32000:
157 return 2;
158 case 44100:
159 case 48000:
160 return 3;
161 case 64000:
162 case 88200:
163 case 96000:
164 return 4;
165 case 128000:
166 case 176400:
167 case 192000:
168 return 5;
169 default:
170 return 1;
171 }
172}
173
174static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
175{
176 return snd_soc_dai_get_drvdata(dai);
177}
178
179static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
180{
181 if (on) {
182 regmap_update_bits(map: pdm->regmap, PDM_DMA_CTRL,
183 PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
184 regmap_update_bits(map: pdm->regmap, PDM_SYSCONFIG,
185 PDM_RX_MASK, PDM_RX_START);
186 } else {
187 regmap_update_bits(map: pdm->regmap, PDM_DMA_CTRL,
188 PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
189 regmap_update_bits(map: pdm->regmap, PDM_SYSCONFIG,
190 PDM_RX_MASK | PDM_RX_CLR_MASK,
191 PDM_RX_STOP | PDM_RX_CLR_WR);
192 }
193}
194
195static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
196 struct snd_pcm_hw_params *params,
197 struct snd_soc_dai *dai)
198{
199 struct rk_pdm_dev *pdm = to_info(dai);
200 unsigned int val = 0;
201 unsigned int clk_rate, clk_div, samplerate;
202 unsigned int clk_src, clk_out = 0;
203 unsigned long m, n;
204 bool change;
205 int ret;
206
207 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
208 return 0;
209
210 samplerate = params_rate(p: params);
211 clk_rate = get_pdm_clk(pdm, sr: samplerate, clk_src: &clk_src, clk_out: &clk_out);
212 if (!clk_rate)
213 return -EINVAL;
214
215 ret = clk_set_rate(clk: pdm->clk, rate: clk_src);
216 if (ret)
217 return -EINVAL;
218
219 if (pdm->version == RK_PDM_RK3308 ||
220 pdm->version == RK_PDM_RV1126) {
221 rational_best_approximation(given_numerator: clk_out, given_denominator: clk_src,
222 GENMASK(16 - 1, 0),
223 GENMASK(16 - 1, 0),
224 best_numerator: &m, best_denominator: &n);
225
226 val = (m << PDM_FD_NUMERATOR_SFT) |
227 (n << PDM_FD_DENOMINATOR_SFT);
228 regmap_update_bits_check(map: pdm->regmap, PDM_CTRL1,
229 PDM_FD_NUMERATOR_MSK |
230 PDM_FD_DENOMINATOR_MSK,
231 val, change: &change);
232 if (change) {
233 reset_control_assert(rstc: pdm->reset);
234 reset_control_deassert(rstc: pdm->reset);
235 rockchip_pdm_rxctrl(pdm, on: 0);
236 }
237 clk_div = n / m;
238 if (clk_div >= 40)
239 val = PDM_CLK_FD_RATIO_40;
240 else if (clk_div <= 35)
241 val = PDM_CLK_FD_RATIO_35;
242 else
243 return -EINVAL;
244 regmap_update_bits(map: pdm->regmap, PDM_CLK_CTRL,
245 PDM_CLK_FD_RATIO_MSK,
246 val);
247 }
248
249 if (pdm->version == RK_PDM_RV1126) {
250 val = get_pdm_cic_ratio(clk: clk_out);
251 regmap_update_bits(map: pdm->regmap, PDM_CLK_CTRL, PDM_CIC_RATIO_MSK, val);
252 val = samplerate_to_bit(samplerate);
253 regmap_update_bits(map: pdm->regmap, PDM_CTRL0,
254 PDM_SAMPLERATE_MSK, PDM_SAMPLERATE(val));
255 } else {
256 val = get_pdm_ds_ratio(sr: samplerate);
257 regmap_update_bits(map: pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
258 }
259
260 regmap_update_bits(map: pdm->regmap, PDM_HPF_CTRL,
261 PDM_HPF_CF_MSK, PDM_HPF_60HZ);
262 regmap_update_bits(map: pdm->regmap, PDM_HPF_CTRL,
263 PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE);
264 regmap_update_bits(map: pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
265 if (pdm->version != RK_PDM_RK3229)
266 regmap_update_bits(map: pdm->regmap, PDM_CTRL0,
267 PDM_MODE_MSK, PDM_MODE_LJ);
268
269 val = 0;
270 switch (params_format(p: params)) {
271 case SNDRV_PCM_FORMAT_S8:
272 val |= PDM_VDW(8);
273 break;
274 case SNDRV_PCM_FORMAT_S16_LE:
275 val |= PDM_VDW(16);
276 break;
277 case SNDRV_PCM_FORMAT_S20_3LE:
278 val |= PDM_VDW(20);
279 break;
280 case SNDRV_PCM_FORMAT_S24_LE:
281 val |= PDM_VDW(24);
282 break;
283 case SNDRV_PCM_FORMAT_S32_LE:
284 val |= PDM_VDW(32);
285 break;
286 default:
287 return -EINVAL;
288 }
289
290 switch (params_channels(p: params)) {
291 case 8:
292 val |= PDM_PATH3_EN;
293 fallthrough;
294 case 6:
295 val |= PDM_PATH2_EN;
296 fallthrough;
297 case 4:
298 val |= PDM_PATH1_EN;
299 fallthrough;
300 case 2:
301 val |= PDM_PATH0_EN;
302 break;
303 default:
304 dev_err(pdm->dev, "invalid channel: %d\n",
305 params_channels(params));
306 return -EINVAL;
307 }
308
309 regmap_update_bits(map: pdm->regmap, PDM_CTRL0,
310 PDM_PATH_MSK | PDM_VDW_MSK,
311 val);
312 /* all channels share the single FIFO */
313 regmap_update_bits(map: pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
314 PDM_DMA_RDL(8 * params_channels(params)));
315
316 return 0;
317}
318
319static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
320 unsigned int fmt)
321{
322 struct rk_pdm_dev *pdm = to_info(dai: cpu_dai);
323 unsigned int mask = 0, val = 0;
324
325 mask = PDM_CKP_MSK;
326 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
327 case SND_SOC_DAIFMT_NB_NF:
328 val = PDM_CKP_NORMAL;
329 break;
330 case SND_SOC_DAIFMT_IB_NF:
331 val = PDM_CKP_INVERTED;
332 break;
333 default:
334 return -EINVAL;
335 }
336
337 pm_runtime_get_sync(dev: cpu_dai->dev);
338 regmap_update_bits(map: pdm->regmap, PDM_CLK_CTRL, mask, val);
339 pm_runtime_put(dev: cpu_dai->dev);
340
341 return 0;
342}
343
344static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
345 struct snd_soc_dai *dai)
346{
347 struct rk_pdm_dev *pdm = to_info(dai);
348 int ret = 0;
349
350 switch (cmd) {
351 case SNDRV_PCM_TRIGGER_START:
352 case SNDRV_PCM_TRIGGER_RESUME:
353 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
354 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
355 rockchip_pdm_rxctrl(pdm, on: 1);
356 break;
357 case SNDRV_PCM_TRIGGER_SUSPEND:
358 case SNDRV_PCM_TRIGGER_STOP:
359 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
360 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
361 rockchip_pdm_rxctrl(pdm, on: 0);
362 break;
363 default:
364 ret = -EINVAL;
365 break;
366 }
367
368 return ret;
369}
370
371static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
372{
373 struct rk_pdm_dev *pdm = to_info(dai);
374
375 snd_soc_dai_dma_data_set_capture(dai, &pdm->capture_dma_data);
376
377 return 0;
378}
379
380static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
381 .probe = rockchip_pdm_dai_probe,
382 .set_fmt = rockchip_pdm_set_fmt,
383 .trigger = rockchip_pdm_trigger,
384 .hw_params = rockchip_pdm_hw_params,
385};
386
387#define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
388#define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
389 SNDRV_PCM_FMTBIT_S20_3LE | \
390 SNDRV_PCM_FMTBIT_S24_LE | \
391 SNDRV_PCM_FMTBIT_S32_LE)
392
393static struct snd_soc_dai_driver rockchip_pdm_dai = {
394 .capture = {
395 .stream_name = "Capture",
396 .channels_min = 2,
397 .channels_max = 8,
398 .rates = ROCKCHIP_PDM_RATES,
399 .formats = ROCKCHIP_PDM_FORMATS,
400 },
401 .ops = &rockchip_pdm_dai_ops,
402 .symmetric_rate = 1,
403};
404
405static const struct snd_soc_component_driver rockchip_pdm_component = {
406 .name = "rockchip-pdm",
407 .legacy_dai_naming = 1,
408};
409
410static int rockchip_pdm_runtime_suspend(struct device *dev)
411{
412 struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
413
414 clk_disable_unprepare(clk: pdm->clk);
415 clk_disable_unprepare(clk: pdm->hclk);
416
417 return 0;
418}
419
420static int rockchip_pdm_runtime_resume(struct device *dev)
421{
422 struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
423 int ret;
424
425 ret = clk_prepare_enable(clk: pdm->clk);
426 if (ret) {
427 dev_err(pdm->dev, "clock enable failed %d\n", ret);
428 return ret;
429 }
430
431 ret = clk_prepare_enable(clk: pdm->hclk);
432 if (ret) {
433 clk_disable_unprepare(clk: pdm->clk);
434 dev_err(pdm->dev, "hclock enable failed %d\n", ret);
435 return ret;
436 }
437
438 return 0;
439}
440
441static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
442{
443 switch (reg) {
444 case PDM_SYSCONFIG:
445 case PDM_CTRL0:
446 case PDM_CTRL1:
447 case PDM_CLK_CTRL:
448 case PDM_HPF_CTRL:
449 case PDM_FIFO_CTRL:
450 case PDM_DMA_CTRL:
451 case PDM_INT_EN:
452 case PDM_INT_CLR:
453 case PDM_DATA_VALID:
454 return true;
455 default:
456 return false;
457 }
458}
459
460static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
461{
462 switch (reg) {
463 case PDM_SYSCONFIG:
464 case PDM_CTRL0:
465 case PDM_CTRL1:
466 case PDM_CLK_CTRL:
467 case PDM_HPF_CTRL:
468 case PDM_FIFO_CTRL:
469 case PDM_DMA_CTRL:
470 case PDM_INT_EN:
471 case PDM_INT_CLR:
472 case PDM_INT_ST:
473 case PDM_DATA_VALID:
474 case PDM_RXFIFO_DATA:
475 case PDM_VERSION:
476 return true;
477 default:
478 return false;
479 }
480}
481
482static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
483{
484 switch (reg) {
485 case PDM_SYSCONFIG:
486 case PDM_FIFO_CTRL:
487 case PDM_INT_CLR:
488 case PDM_INT_ST:
489 case PDM_RXFIFO_DATA:
490 return true;
491 default:
492 return false;
493 }
494}
495
496static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg)
497{
498 switch (reg) {
499 case PDM_RXFIFO_DATA:
500 return true;
501 default:
502 return false;
503 }
504}
505
506static const struct reg_default rockchip_pdm_reg_defaults[] = {
507 { PDM_CTRL0, 0x78000017 },
508 { PDM_CTRL1, 0x0bb8ea60 },
509 { PDM_CLK_CTRL, 0x0000e401 },
510 { PDM_DMA_CTRL, 0x0000001f },
511};
512
513static const struct regmap_config rockchip_pdm_regmap_config = {
514 .reg_bits = 32,
515 .reg_stride = 4,
516 .val_bits = 32,
517 .max_register = PDM_VERSION,
518 .reg_defaults = rockchip_pdm_reg_defaults,
519 .num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults),
520 .writeable_reg = rockchip_pdm_wr_reg,
521 .readable_reg = rockchip_pdm_rd_reg,
522 .volatile_reg = rockchip_pdm_volatile_reg,
523 .precious_reg = rockchip_pdm_precious_reg,
524 .cache_type = REGCACHE_FLAT,
525};
526
527static const struct of_device_id rockchip_pdm_match[] __maybe_unused = {
528 { .compatible = "rockchip,pdm",
529 .data = (void *)RK_PDM_RK3229 },
530 { .compatible = "rockchip,px30-pdm",
531 .data = (void *)RK_PDM_RK3308 },
532 { .compatible = "rockchip,rk1808-pdm",
533 .data = (void *)RK_PDM_RK3308 },
534 { .compatible = "rockchip,rk3308-pdm",
535 .data = (void *)RK_PDM_RK3308 },
536 { .compatible = "rockchip,rk3568-pdm",
537 .data = (void *)RK_PDM_RV1126 },
538 { .compatible = "rockchip,rv1126-pdm",
539 .data = (void *)RK_PDM_RV1126 },
540 {},
541};
542MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
543
544static int rockchip_pdm_path_parse(struct rk_pdm_dev *pdm, struct device_node *node)
545{
546 unsigned int path[PDM_PATH_MAX];
547 int cnt = 0, ret = 0, i = 0, val = 0, msk = 0;
548
549 cnt = of_count_phandle_with_args(np: node, list_name: "rockchip,path-map",
550 NULL);
551 if (cnt != PDM_PATH_MAX)
552 return cnt;
553
554 ret = of_property_read_u32_array(np: node, propname: "rockchip,path-map",
555 out_values: path, sz: cnt);
556 if (ret)
557 return ret;
558
559 for (i = 0; i < cnt; i++) {
560 if (path[i] >= PDM_PATH_MAX)
561 return -EINVAL;
562 msk |= PDM_PATH_MASK(i);
563 val |= PDM_PATH(i, path[i]);
564 }
565
566 regmap_update_bits(map: pdm->regmap, PDM_CLK_CTRL, mask: msk, val);
567
568 return 0;
569}
570
571static int rockchip_pdm_probe(struct platform_device *pdev)
572{
573 struct device_node *node = pdev->dev.of_node;
574 struct rk_pdm_dev *pdm;
575 struct resource *res;
576 void __iomem *regs;
577 int ret;
578
579 pdm = devm_kzalloc(dev: &pdev->dev, size: sizeof(*pdm), GFP_KERNEL);
580 if (!pdm)
581 return -ENOMEM;
582
583 pdm->version = (unsigned long)device_get_match_data(dev: &pdev->dev);
584 if (pdm->version == RK_PDM_RK3308) {
585 pdm->reset = devm_reset_control_get(dev: &pdev->dev, id: "pdm-m");
586 if (IS_ERR(ptr: pdm->reset))
587 return PTR_ERR(ptr: pdm->reset);
588 }
589
590 regs = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res);
591 if (IS_ERR(ptr: regs))
592 return PTR_ERR(ptr: regs);
593
594 pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
595 &rockchip_pdm_regmap_config);
596 if (IS_ERR(ptr: pdm->regmap))
597 return PTR_ERR(ptr: pdm->regmap);
598
599 pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
600 pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
601 pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;
602
603 pdm->dev = &pdev->dev;
604 dev_set_drvdata(dev: &pdev->dev, data: pdm);
605
606 pdm->clk = devm_clk_get(dev: &pdev->dev, id: "pdm_clk");
607 if (IS_ERR(ptr: pdm->clk))
608 return PTR_ERR(ptr: pdm->clk);
609
610 pdm->hclk = devm_clk_get(dev: &pdev->dev, id: "pdm_hclk");
611 if (IS_ERR(ptr: pdm->hclk))
612 return PTR_ERR(ptr: pdm->hclk);
613
614 ret = clk_prepare_enable(clk: pdm->hclk);
615 if (ret)
616 return ret;
617
618 pm_runtime_enable(dev: &pdev->dev);
619 if (!pm_runtime_enabled(dev: &pdev->dev)) {
620 ret = rockchip_pdm_runtime_resume(dev: &pdev->dev);
621 if (ret)
622 goto err_pm_disable;
623 }
624
625 ret = devm_snd_soc_register_component(dev: &pdev->dev,
626 component_driver: &rockchip_pdm_component,
627 dai_drv: &rockchip_pdm_dai, num_dai: 1);
628
629 if (ret) {
630 dev_err(&pdev->dev, "could not register dai: %d\n", ret);
631 goto err_suspend;
632 }
633
634 rockchip_pdm_rxctrl(pdm, on: 0);
635
636 ret = rockchip_pdm_path_parse(pdm, node);
637 if (ret != 0 && ret != -ENOENT)
638 goto err_suspend;
639
640 ret = devm_snd_dmaengine_pcm_register(dev: &pdev->dev, NULL, flags: 0);
641 if (ret) {
642 dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
643 goto err_suspend;
644 }
645
646 return 0;
647
648err_suspend:
649 if (!pm_runtime_status_suspended(dev: &pdev->dev))
650 rockchip_pdm_runtime_suspend(dev: &pdev->dev);
651err_pm_disable:
652 pm_runtime_disable(dev: &pdev->dev);
653
654 clk_disable_unprepare(clk: pdm->hclk);
655
656 return ret;
657}
658
659static void rockchip_pdm_remove(struct platform_device *pdev)
660{
661 struct rk_pdm_dev *pdm = dev_get_drvdata(dev: &pdev->dev);
662
663 pm_runtime_disable(dev: &pdev->dev);
664 if (!pm_runtime_status_suspended(dev: &pdev->dev))
665 rockchip_pdm_runtime_suspend(dev: &pdev->dev);
666
667 clk_disable_unprepare(clk: pdm->clk);
668 clk_disable_unprepare(clk: pdm->hclk);
669}
670
671static int rockchip_pdm_suspend(struct device *dev)
672{
673 struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
674
675 regcache_mark_dirty(map: pdm->regmap);
676
677 return 0;
678}
679
680static int rockchip_pdm_resume(struct device *dev)
681{
682 struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
683 int ret;
684
685 ret = pm_runtime_resume_and_get(dev);
686 if (ret < 0)
687 return ret;
688
689 ret = regcache_sync(map: pdm->regmap);
690
691 pm_runtime_put(dev);
692
693 return ret;
694}
695
696static const struct dev_pm_ops rockchip_pdm_pm_ops = {
697 RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
698 rockchip_pdm_runtime_resume, NULL)
699 SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
700};
701
702static struct platform_driver rockchip_pdm_driver = {
703 .probe = rockchip_pdm_probe,
704 .remove = rockchip_pdm_remove,
705 .driver = {
706 .name = "rockchip-pdm",
707 .of_match_table = of_match_ptr(rockchip_pdm_match),
708 .pm = pm_ptr(&rockchip_pdm_pm_ops),
709 },
710};
711
712module_platform_driver(rockchip_pdm_driver);
713
714MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
715MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
716MODULE_LICENSE("GPL v2");
717

source code of linux/sound/soc/rockchip/rockchip_pdm.c