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 24 enum rk_pdm_version { 25 RK_PDM_RK3229, 26 RK_PDM_RK3308, 27 RK_PDM_RV1126, 28 }; 29 30 struct 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 40 struct rk_pdm_clkref { 41 unsigned int sr; 42 unsigned int clk; 43 unsigned int clk_out; 44 }; 45 46 struct rk_pdm_ds_ratio { 47 unsigned int ratio; 48 unsigned int sr; 49 }; 50 51 static 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 59 static 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 77 static 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(pdm->clk, 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(pdm->clk, PDM_SIGNOFF_CLK_RATE); 104 *clk_src = clk; 105 } 106 return clk; 107 } 108 109 static 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 } 124 125 static 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 } 144 145 static 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 } 173 174 static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai) 175 { 176 return snd_soc_dai_get_drvdata(dai); 177 } 178 179 static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on) 180 { 181 if (on) { 182 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, 183 PDM_DMA_RD_MSK, PDM_DMA_RD_EN); 184 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG, 185 PDM_RX_MASK, PDM_RX_START); 186 } else { 187 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, 188 PDM_DMA_RD_MSK, PDM_DMA_RD_DIS); 189 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG, 190 PDM_RX_MASK | PDM_RX_CLR_MASK, 191 PDM_RX_STOP | PDM_RX_CLR_WR); 192 } 193 } 194 195 static 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(params); 211 clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out); 212 if (!clk_rate) 213 return -EINVAL; 214 215 ret = clk_set_rate(pdm->clk, 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(clk_out, clk_src, 222 GENMASK(16 - 1, 0), 223 GENMASK(16 - 1, 0), 224 &m, &n); 225 226 val = (m << PDM_FD_NUMERATOR_SFT) | 227 (n << PDM_FD_DENOMINATOR_SFT); 228 regmap_update_bits_check(pdm->regmap, PDM_CTRL1, 229 PDM_FD_NUMERATOR_MSK | 230 PDM_FD_DENOMINATOR_MSK, 231 val, &change); 232 if (change) { 233 reset_control_assert(pdm->reset); 234 reset_control_deassert(pdm->reset); 235 rockchip_pdm_rxctrl(pdm, 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(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_out); 251 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CIC_RATIO_MSK, val); 252 val = samplerate_to_bit(samplerate); 253 regmap_update_bits(pdm->regmap, PDM_CTRL0, 254 PDM_SAMPLERATE_MSK, PDM_SAMPLERATE(val)); 255 } else { 256 val = get_pdm_ds_ratio(samplerate); 257 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val); 258 } 259 260 regmap_update_bits(pdm->regmap, PDM_HPF_CTRL, 261 PDM_HPF_CF_MSK, PDM_HPF_60HZ); 262 regmap_update_bits(pdm->regmap, PDM_HPF_CTRL, 263 PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE); 264 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN); 265 if (pdm->version != RK_PDM_RK3229) 266 regmap_update_bits(pdm->regmap, PDM_CTRL0, 267 PDM_MODE_MSK, PDM_MODE_LJ); 268 269 val = 0; 270 switch (params_format(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(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(pdm->regmap, PDM_CTRL0, 310 PDM_PATH_MSK | PDM_VDW_MSK, 311 val); 312 /* all channels share the single FIFO */ 313 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK, 314 PDM_DMA_RDL(8 * params_channels(params))); 315 316 return 0; 317 } 318 319 static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai, 320 unsigned int fmt) 321 { 322 struct rk_pdm_dev *pdm = to_info(cpu_dai); 323 unsigned int mask = 0, val = 0; 324 int ret; 325 326 mask = PDM_CKP_MSK; 327 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 328 case SND_SOC_DAIFMT_NB_NF: 329 val = PDM_CKP_NORMAL; 330 break; 331 case SND_SOC_DAIFMT_IB_NF: 332 val = PDM_CKP_INVERTED; 333 break; 334 default: 335 return -EINVAL; 336 } 337 338 ret = pm_runtime_resume_and_get(cpu_dai->dev); 339 if (ret) 340 return ret; 341 342 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val); 343 pm_runtime_put(cpu_dai->dev); 344 345 return 0; 346 } 347 348 static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd, 349 struct snd_soc_dai *dai) 350 { 351 struct rk_pdm_dev *pdm = to_info(dai); 352 int ret = 0; 353 354 switch (cmd) { 355 case SNDRV_PCM_TRIGGER_START: 356 case SNDRV_PCM_TRIGGER_RESUME: 357 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 358 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 359 rockchip_pdm_rxctrl(pdm, 1); 360 break; 361 case SNDRV_PCM_TRIGGER_SUSPEND: 362 case SNDRV_PCM_TRIGGER_STOP: 363 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 364 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 365 rockchip_pdm_rxctrl(pdm, 0); 366 break; 367 default: 368 ret = -EINVAL; 369 break; 370 } 371 372 return ret; 373 } 374 375 static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai) 376 { 377 struct rk_pdm_dev *pdm = to_info(dai); 378 379 snd_soc_dai_dma_data_set_capture(dai, &pdm->capture_dma_data); 380 381 return 0; 382 } 383 384 static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = { 385 .probe = rockchip_pdm_dai_probe, 386 .set_fmt = rockchip_pdm_set_fmt, 387 .trigger = rockchip_pdm_trigger, 388 .hw_params = rockchip_pdm_hw_params, 389 }; 390 391 #define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000 392 #define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ 393 SNDRV_PCM_FMTBIT_S20_3LE | \ 394 SNDRV_PCM_FMTBIT_S24_LE | \ 395 SNDRV_PCM_FMTBIT_S32_LE) 396 397 static struct snd_soc_dai_driver rockchip_pdm_dai = { 398 .capture = { 399 .stream_name = "Capture", 400 .channels_min = 2, 401 .channels_max = 8, 402 .rates = ROCKCHIP_PDM_RATES, 403 .formats = ROCKCHIP_PDM_FORMATS, 404 }, 405 .ops = &rockchip_pdm_dai_ops, 406 .symmetric_rate = 1, 407 }; 408 409 static const struct snd_soc_component_driver rockchip_pdm_component = { 410 .name = "rockchip-pdm", 411 .legacy_dai_naming = 1, 412 }; 413 414 static int rockchip_pdm_runtime_suspend(struct device *dev) 415 { 416 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 417 418 clk_disable_unprepare(pdm->clk); 419 clk_disable_unprepare(pdm->hclk); 420 421 return 0; 422 } 423 424 static int rockchip_pdm_runtime_resume(struct device *dev) 425 { 426 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 427 int ret; 428 429 ret = clk_prepare_enable(pdm->hclk); 430 if (ret) { 431 dev_err(pdm->dev, "hclock enable failed %d\n", ret); 432 return ret; 433 } 434 435 ret = clk_prepare_enable(pdm->clk); 436 if (ret) { 437 clk_disable_unprepare(pdm->hclk); 438 dev_err(pdm->dev, "clock enable failed %d\n", ret); 439 return ret; 440 } 441 442 return 0; 443 } 444 445 static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg) 446 { 447 switch (reg) { 448 case PDM_SYSCONFIG: 449 case PDM_CTRL0: 450 case PDM_CTRL1: 451 case PDM_CLK_CTRL: 452 case PDM_HPF_CTRL: 453 case PDM_FIFO_CTRL: 454 case PDM_DMA_CTRL: 455 case PDM_INT_EN: 456 case PDM_INT_CLR: 457 case PDM_DATA_VALID: 458 return true; 459 default: 460 return false; 461 } 462 } 463 464 static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg) 465 { 466 switch (reg) { 467 case PDM_SYSCONFIG: 468 case PDM_CTRL0: 469 case PDM_CTRL1: 470 case PDM_CLK_CTRL: 471 case PDM_HPF_CTRL: 472 case PDM_FIFO_CTRL: 473 case PDM_DMA_CTRL: 474 case PDM_INT_EN: 475 case PDM_INT_CLR: 476 case PDM_INT_ST: 477 case PDM_DATA_VALID: 478 case PDM_RXFIFO_DATA: 479 case PDM_VERSION: 480 return true; 481 default: 482 return false; 483 } 484 } 485 486 static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg) 487 { 488 switch (reg) { 489 case PDM_SYSCONFIG: 490 case PDM_FIFO_CTRL: 491 case PDM_INT_CLR: 492 case PDM_INT_ST: 493 case PDM_RXFIFO_DATA: 494 return true; 495 default: 496 return false; 497 } 498 } 499 500 static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg) 501 { 502 switch (reg) { 503 case PDM_RXFIFO_DATA: 504 return true; 505 default: 506 return false; 507 } 508 } 509 510 static const struct reg_default rockchip_pdm_reg_defaults[] = { 511 { PDM_CTRL0, 0x78000017 }, 512 { PDM_CTRL1, 0x0bb8ea60 }, 513 { PDM_CLK_CTRL, 0x0000e401 }, 514 { PDM_DMA_CTRL, 0x0000001f }, 515 }; 516 517 static const struct regmap_config rockchip_pdm_regmap_config = { 518 .reg_bits = 32, 519 .reg_stride = 4, 520 .val_bits = 32, 521 .max_register = PDM_VERSION, 522 .reg_defaults = rockchip_pdm_reg_defaults, 523 .num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults), 524 .writeable_reg = rockchip_pdm_wr_reg, 525 .readable_reg = rockchip_pdm_rd_reg, 526 .volatile_reg = rockchip_pdm_volatile_reg, 527 .precious_reg = rockchip_pdm_precious_reg, 528 .cache_type = REGCACHE_FLAT, 529 }; 530 531 static const struct of_device_id rockchip_pdm_match[] __maybe_unused = { 532 { .compatible = "rockchip,pdm", 533 .data = (void *)RK_PDM_RK3229 }, 534 { .compatible = "rockchip,px30-pdm", 535 .data = (void *)RK_PDM_RK3308 }, 536 { .compatible = "rockchip,rk1808-pdm", 537 .data = (void *)RK_PDM_RK3308 }, 538 { .compatible = "rockchip,rk3308-pdm", 539 .data = (void *)RK_PDM_RK3308 }, 540 { .compatible = "rockchip,rk3568-pdm", 541 .data = (void *)RK_PDM_RV1126 }, 542 { .compatible = "rockchip,rv1126-pdm", 543 .data = (void *)RK_PDM_RV1126 }, 544 {}, 545 }; 546 MODULE_DEVICE_TABLE(of, rockchip_pdm_match); 547 548 static int rockchip_pdm_path_parse(struct rk_pdm_dev *pdm, struct device_node *node) 549 { 550 unsigned int path[PDM_PATH_MAX]; 551 int cnt = 0, ret = 0, i = 0, val = 0, msk = 0; 552 553 cnt = of_count_phandle_with_args(node, "rockchip,path-map", 554 NULL); 555 if (cnt != PDM_PATH_MAX) 556 return cnt; 557 558 ret = of_property_read_u32_array(node, "rockchip,path-map", 559 path, cnt); 560 if (ret) 561 return ret; 562 563 for (i = 0; i < cnt; i++) { 564 if (path[i] >= PDM_PATH_MAX) 565 return -EINVAL; 566 msk |= PDM_PATH_MASK(i); 567 val |= PDM_PATH(i, path[i]); 568 } 569 570 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, msk, val); 571 572 return 0; 573 } 574 575 static int rockchip_pdm_probe(struct platform_device *pdev) 576 { 577 struct device_node *node = pdev->dev.of_node; 578 struct rk_pdm_dev *pdm; 579 struct resource *res; 580 void __iomem *regs; 581 int ret; 582 583 pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL); 584 if (!pdm) 585 return -ENOMEM; 586 587 pdm->version = (unsigned long)device_get_match_data(&pdev->dev); 588 if (pdm->version == RK_PDM_RK3308) { 589 pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m"); 590 if (IS_ERR(pdm->reset)) 591 return PTR_ERR(pdm->reset); 592 } 593 594 regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 595 if (IS_ERR(regs)) 596 return PTR_ERR(regs); 597 598 pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs, 599 &rockchip_pdm_regmap_config); 600 if (IS_ERR(pdm->regmap)) 601 return PTR_ERR(pdm->regmap); 602 603 pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA; 604 pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 605 pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE; 606 607 pdm->dev = &pdev->dev; 608 dev_set_drvdata(&pdev->dev, pdm); 609 610 pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk"); 611 if (IS_ERR(pdm->clk)) 612 return PTR_ERR(pdm->clk); 613 614 pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk"); 615 if (IS_ERR(pdm->hclk)) 616 return PTR_ERR(pdm->hclk); 617 618 ret = clk_prepare_enable(pdm->hclk); 619 if (ret) 620 return ret; 621 622 pm_runtime_enable(&pdev->dev); 623 if (!pm_runtime_enabled(&pdev->dev)) { 624 ret = rockchip_pdm_runtime_resume(&pdev->dev); 625 if (ret) 626 goto err_pm_disable; 627 } 628 629 ret = devm_snd_soc_register_component(&pdev->dev, 630 &rockchip_pdm_component, 631 &rockchip_pdm_dai, 1); 632 633 if (ret) { 634 dev_err(&pdev->dev, "could not register dai: %d\n", ret); 635 goto err_suspend; 636 } 637 638 rockchip_pdm_rxctrl(pdm, 0); 639 640 ret = rockchip_pdm_path_parse(pdm, node); 641 if (ret != 0 && ret != -ENOENT) 642 goto err_suspend; 643 644 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); 645 if (ret) { 646 dev_err(&pdev->dev, "could not register pcm: %d\n", ret); 647 goto err_suspend; 648 } 649 650 return 0; 651 652 err_suspend: 653 if (!pm_runtime_status_suspended(&pdev->dev)) 654 rockchip_pdm_runtime_suspend(&pdev->dev); 655 err_pm_disable: 656 pm_runtime_disable(&pdev->dev); 657 658 clk_disable_unprepare(pdm->hclk); 659 660 return ret; 661 } 662 663 static void rockchip_pdm_remove(struct platform_device *pdev) 664 { 665 struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev); 666 667 pm_runtime_disable(&pdev->dev); 668 if (!pm_runtime_status_suspended(&pdev->dev)) 669 rockchip_pdm_runtime_suspend(&pdev->dev); 670 671 clk_disable_unprepare(pdm->clk); 672 clk_disable_unprepare(pdm->hclk); 673 } 674 675 static int rockchip_pdm_suspend(struct device *dev) 676 { 677 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 678 679 regcache_mark_dirty(pdm->regmap); 680 681 return 0; 682 } 683 684 static int rockchip_pdm_resume(struct device *dev) 685 { 686 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 687 int ret; 688 689 ret = pm_runtime_resume_and_get(dev); 690 if (ret < 0) 691 return ret; 692 693 ret = regcache_sync(pdm->regmap); 694 695 pm_runtime_put(dev); 696 697 return ret; 698 } 699 700 static const struct dev_pm_ops rockchip_pdm_pm_ops = { 701 RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend, 702 rockchip_pdm_runtime_resume, NULL) 703 SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume) 704 }; 705 706 static struct platform_driver rockchip_pdm_driver = { 707 .probe = rockchip_pdm_probe, 708 .remove = rockchip_pdm_remove, 709 .driver = { 710 .name = "rockchip-pdm", 711 .of_match_table = of_match_ptr(rockchip_pdm_match), 712 .pm = pm_ptr(&rockchip_pdm_pm_ops), 713 }, 714 }; 715 716 module_platform_driver(rockchip_pdm_driver); 717 718 MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>"); 719 MODULE_DESCRIPTION("Rockchip PDM Controller Driver"); 720 MODULE_LICENSE("GPL v2"); 721