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/of_device.h> 12 #include <linux/pm_runtime.h> 13 #include <linux/rational.h> 14 #include <linux/regmap.h> 15 #include <linux/reset.h> 16 #include <sound/dmaengine_pcm.h> 17 #include <sound/pcm_params.h> 18 19 #include "rockchip_pdm.h" 20 21 #define PDM_DMA_BURST_SIZE (8) /* size * width: 8*4 = 32 bytes */ 22 #define PDM_SIGNOFF_CLK_RATE (100000000) 23 #define PDM_PATH_MAX (4) 24 25 enum rk_pdm_version { 26 RK_PDM_RK3229, 27 RK_PDM_RK3308, 28 RK_PDM_RV1126, 29 }; 30 31 struct rk_pdm_dev { 32 struct device *dev; 33 struct clk *clk; 34 struct clk *hclk; 35 struct regmap *regmap; 36 struct snd_dmaengine_dai_dma_data capture_dma_data; 37 struct reset_control *reset; 38 enum rk_pdm_version version; 39 }; 40 41 struct rk_pdm_clkref { 42 unsigned int sr; 43 unsigned int clk; 44 unsigned int clk_out; 45 }; 46 47 struct rk_pdm_ds_ratio { 48 unsigned int ratio; 49 unsigned int sr; 50 }; 51 52 static struct rk_pdm_clkref clkref[] = { 53 { 8000, 40960000, 2048000 }, 54 { 11025, 56448000, 2822400 }, 55 { 12000, 61440000, 3072000 }, 56 { 8000, 98304000, 2048000 }, 57 { 12000, 98304000, 3072000 }, 58 }; 59 60 static struct rk_pdm_ds_ratio ds_ratio[] = { 61 { 0, 192000 }, 62 { 0, 176400 }, 63 { 0, 128000 }, 64 { 1, 96000 }, 65 { 1, 88200 }, 66 { 1, 64000 }, 67 { 2, 48000 }, 68 { 2, 44100 }, 69 { 2, 32000 }, 70 { 3, 24000 }, 71 { 3, 22050 }, 72 { 3, 16000 }, 73 { 4, 12000 }, 74 { 4, 11025 }, 75 { 4, 8000 }, 76 }; 77 78 static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr, 79 unsigned int *clk_src, unsigned int *clk_out) 80 { 81 unsigned int i, count, clk, div, rate; 82 83 clk = 0; 84 if (!sr) 85 return clk; 86 87 count = ARRAY_SIZE(clkref); 88 for (i = 0; i < count; i++) { 89 if (sr % clkref[i].sr) 90 continue; 91 div = sr / clkref[i].sr; 92 if ((div & (div - 1)) == 0) { 93 *clk_out = clkref[i].clk_out; 94 rate = clk_round_rate(pdm->clk, clkref[i].clk); 95 if (rate != clkref[i].clk) 96 continue; 97 clk = clkref[i].clk; 98 *clk_src = clkref[i].clk; 99 break; 100 } 101 } 102 103 if (!clk) { 104 clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE); 105 *clk_src = clk; 106 } 107 return clk; 108 } 109 110 static unsigned int get_pdm_ds_ratio(unsigned int sr) 111 { 112 unsigned int i, count, ratio; 113 114 ratio = 0; 115 if (!sr) 116 return ratio; 117 118 count = ARRAY_SIZE(ds_ratio); 119 for (i = 0; i < count; i++) { 120 if (sr == ds_ratio[i].sr) 121 ratio = ds_ratio[i].ratio; 122 } 123 return ratio; 124 } 125 126 static unsigned int get_pdm_cic_ratio(unsigned int clk) 127 { 128 switch (clk) { 129 case 4096000: 130 case 5644800: 131 case 6144000: 132 return 0; 133 case 2048000: 134 case 2822400: 135 case 3072000: 136 return 1; 137 case 1024000: 138 case 1411200: 139 case 1536000: 140 return 2; 141 default: 142 return 1; 143 } 144 } 145 146 static unsigned int samplerate_to_bit(unsigned int samplerate) 147 { 148 switch (samplerate) { 149 case 8000: 150 case 11025: 151 case 12000: 152 return 0; 153 case 16000: 154 case 22050: 155 case 24000: 156 return 1; 157 case 32000: 158 return 2; 159 case 44100: 160 case 48000: 161 return 3; 162 case 64000: 163 case 88200: 164 case 96000: 165 return 4; 166 case 128000: 167 case 176400: 168 case 192000: 169 return 5; 170 default: 171 return 1; 172 } 173 } 174 175 static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai) 176 { 177 return snd_soc_dai_get_drvdata(dai); 178 } 179 180 static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on) 181 { 182 if (on) { 183 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, 184 PDM_DMA_RD_MSK, PDM_DMA_RD_EN); 185 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG, 186 PDM_RX_MASK, PDM_RX_START); 187 } else { 188 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, 189 PDM_DMA_RD_MSK, PDM_DMA_RD_DIS); 190 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG, 191 PDM_RX_MASK | PDM_RX_CLR_MASK, 192 PDM_RX_STOP | PDM_RX_CLR_WR); 193 } 194 } 195 196 static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream, 197 struct snd_pcm_hw_params *params, 198 struct snd_soc_dai *dai) 199 { 200 struct rk_pdm_dev *pdm = to_info(dai); 201 unsigned int val = 0; 202 unsigned int clk_rate, clk_div, samplerate; 203 unsigned int clk_src, clk_out = 0; 204 unsigned long m, n; 205 bool change; 206 int ret; 207 208 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 209 return 0; 210 211 samplerate = params_rate(params); 212 clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out); 213 if (!clk_rate) 214 return -EINVAL; 215 216 ret = clk_set_rate(pdm->clk, clk_src); 217 if (ret) 218 return -EINVAL; 219 220 if (pdm->version == RK_PDM_RK3308 || 221 pdm->version == RK_PDM_RV1126) { 222 rational_best_approximation(clk_out, clk_src, 223 GENMASK(16 - 1, 0), 224 GENMASK(16 - 1, 0), 225 &m, &n); 226 227 val = (m << PDM_FD_NUMERATOR_SFT) | 228 (n << PDM_FD_DENOMINATOR_SFT); 229 regmap_update_bits_check(pdm->regmap, PDM_CTRL1, 230 PDM_FD_NUMERATOR_MSK | 231 PDM_FD_DENOMINATOR_MSK, 232 val, &change); 233 if (change) { 234 reset_control_assert(pdm->reset); 235 reset_control_deassert(pdm->reset); 236 rockchip_pdm_rxctrl(pdm, 0); 237 } 238 clk_div = n / m; 239 if (clk_div >= 40) 240 val = PDM_CLK_FD_RATIO_40; 241 else if (clk_div <= 35) 242 val = PDM_CLK_FD_RATIO_35; 243 else 244 return -EINVAL; 245 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, 246 PDM_CLK_FD_RATIO_MSK, 247 val); 248 } 249 250 if (pdm->version == RK_PDM_RV1126) { 251 val = get_pdm_cic_ratio(clk_out); 252 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CIC_RATIO_MSK, val); 253 val = samplerate_to_bit(samplerate); 254 regmap_update_bits(pdm->regmap, PDM_CTRL0, 255 PDM_SAMPLERATE_MSK, PDM_SAMPLERATE(val)); 256 } else { 257 val = get_pdm_ds_ratio(samplerate); 258 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val); 259 } 260 261 regmap_update_bits(pdm->regmap, PDM_HPF_CTRL, 262 PDM_HPF_CF_MSK, PDM_HPF_60HZ); 263 regmap_update_bits(pdm->regmap, PDM_HPF_CTRL, 264 PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE); 265 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN); 266 if (pdm->version != RK_PDM_RK3229) 267 regmap_update_bits(pdm->regmap, PDM_CTRL0, 268 PDM_MODE_MSK, PDM_MODE_LJ); 269 270 val = 0; 271 switch (params_format(params)) { 272 case SNDRV_PCM_FORMAT_S8: 273 val |= PDM_VDW(8); 274 break; 275 case SNDRV_PCM_FORMAT_S16_LE: 276 val |= PDM_VDW(16); 277 break; 278 case SNDRV_PCM_FORMAT_S20_3LE: 279 val |= PDM_VDW(20); 280 break; 281 case SNDRV_PCM_FORMAT_S24_LE: 282 val |= PDM_VDW(24); 283 break; 284 case SNDRV_PCM_FORMAT_S32_LE: 285 val |= PDM_VDW(32); 286 break; 287 default: 288 return -EINVAL; 289 } 290 291 switch (params_channels(params)) { 292 case 8: 293 val |= PDM_PATH3_EN; 294 fallthrough; 295 case 6: 296 val |= PDM_PATH2_EN; 297 fallthrough; 298 case 4: 299 val |= PDM_PATH1_EN; 300 fallthrough; 301 case 2: 302 val |= PDM_PATH0_EN; 303 break; 304 default: 305 dev_err(pdm->dev, "invalid channel: %d\n", 306 params_channels(params)); 307 return -EINVAL; 308 } 309 310 regmap_update_bits(pdm->regmap, PDM_CTRL0, 311 PDM_PATH_MSK | PDM_VDW_MSK, 312 val); 313 /* all channels share the single FIFO */ 314 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK, 315 PDM_DMA_RDL(8 * params_channels(params))); 316 317 return 0; 318 } 319 320 static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai, 321 unsigned int fmt) 322 { 323 struct rk_pdm_dev *pdm = to_info(cpu_dai); 324 unsigned int mask = 0, val = 0; 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 pm_runtime_get_sync(cpu_dai->dev); 339 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val); 340 pm_runtime_put(cpu_dai->dev); 341 342 return 0; 343 } 344 345 static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd, 346 struct snd_soc_dai *dai) 347 { 348 struct rk_pdm_dev *pdm = to_info(dai); 349 int ret = 0; 350 351 switch (cmd) { 352 case SNDRV_PCM_TRIGGER_START: 353 case SNDRV_PCM_TRIGGER_RESUME: 354 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 355 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 356 rockchip_pdm_rxctrl(pdm, 1); 357 break; 358 case SNDRV_PCM_TRIGGER_SUSPEND: 359 case SNDRV_PCM_TRIGGER_STOP: 360 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 361 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 362 rockchip_pdm_rxctrl(pdm, 0); 363 break; 364 default: 365 ret = -EINVAL; 366 break; 367 } 368 369 return ret; 370 } 371 372 static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai) 373 { 374 struct rk_pdm_dev *pdm = to_info(dai); 375 376 dai->capture_dma_data = &pdm->capture_dma_data; 377 378 return 0; 379 } 380 381 static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = { 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) 392 393 static struct snd_soc_dai_driver rockchip_pdm_dai = { 394 .probe = rockchip_pdm_dai_probe, 395 .capture = { 396 .stream_name = "Capture", 397 .channels_min = 2, 398 .channels_max = 8, 399 .rates = ROCKCHIP_PDM_RATES, 400 .formats = ROCKCHIP_PDM_FORMATS, 401 }, 402 .ops = &rockchip_pdm_dai_ops, 403 .symmetric_rate = 1, 404 }; 405 406 static const struct snd_soc_component_driver rockchip_pdm_component = { 407 .name = "rockchip-pdm", 408 .legacy_dai_naming = 1, 409 }; 410 411 static int rockchip_pdm_runtime_suspend(struct device *dev) 412 { 413 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 414 415 clk_disable_unprepare(pdm->clk); 416 clk_disable_unprepare(pdm->hclk); 417 418 return 0; 419 } 420 421 static int rockchip_pdm_runtime_resume(struct device *dev) 422 { 423 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 424 int ret; 425 426 ret = clk_prepare_enable(pdm->clk); 427 if (ret) { 428 dev_err(pdm->dev, "clock enable failed %d\n", ret); 429 return ret; 430 } 431 432 ret = clk_prepare_enable(pdm->hclk); 433 if (ret) { 434 clk_disable_unprepare(pdm->clk); 435 dev_err(pdm->dev, "hclock enable failed %d\n", ret); 436 return ret; 437 } 438 439 return 0; 440 } 441 442 static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg) 443 { 444 switch (reg) { 445 case PDM_SYSCONFIG: 446 case PDM_CTRL0: 447 case PDM_CTRL1: 448 case PDM_CLK_CTRL: 449 case PDM_HPF_CTRL: 450 case PDM_FIFO_CTRL: 451 case PDM_DMA_CTRL: 452 case PDM_INT_EN: 453 case PDM_INT_CLR: 454 case PDM_DATA_VALID: 455 return true; 456 default: 457 return false; 458 } 459 } 460 461 static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg) 462 { 463 switch (reg) { 464 case PDM_SYSCONFIG: 465 case PDM_CTRL0: 466 case PDM_CTRL1: 467 case PDM_CLK_CTRL: 468 case PDM_HPF_CTRL: 469 case PDM_FIFO_CTRL: 470 case PDM_DMA_CTRL: 471 case PDM_INT_EN: 472 case PDM_INT_CLR: 473 case PDM_INT_ST: 474 case PDM_DATA_VALID: 475 case PDM_RXFIFO_DATA: 476 case PDM_VERSION: 477 return true; 478 default: 479 return false; 480 } 481 } 482 483 static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg) 484 { 485 switch (reg) { 486 case PDM_SYSCONFIG: 487 case PDM_FIFO_CTRL: 488 case PDM_INT_CLR: 489 case PDM_INT_ST: 490 case PDM_RXFIFO_DATA: 491 return true; 492 default: 493 return false; 494 } 495 } 496 497 static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg) 498 { 499 switch (reg) { 500 case PDM_RXFIFO_DATA: 501 return true; 502 default: 503 return false; 504 } 505 } 506 507 static const struct reg_default rockchip_pdm_reg_defaults[] = { 508 { PDM_CTRL0, 0x78000017 }, 509 { PDM_CTRL1, 0x0bb8ea60 }, 510 { PDM_CLK_CTRL, 0x0000e401 }, 511 { PDM_DMA_CTRL, 0x0000001f }, 512 }; 513 514 static const struct regmap_config rockchip_pdm_regmap_config = { 515 .reg_bits = 32, 516 .reg_stride = 4, 517 .val_bits = 32, 518 .max_register = PDM_VERSION, 519 .reg_defaults = rockchip_pdm_reg_defaults, 520 .num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults), 521 .writeable_reg = rockchip_pdm_wr_reg, 522 .readable_reg = rockchip_pdm_rd_reg, 523 .volatile_reg = rockchip_pdm_volatile_reg, 524 .precious_reg = rockchip_pdm_precious_reg, 525 .cache_type = REGCACHE_FLAT, 526 }; 527 528 static const struct of_device_id rockchip_pdm_match[] __maybe_unused = { 529 { .compatible = "rockchip,pdm", 530 .data = (void *)RK_PDM_RK3229 }, 531 { .compatible = "rockchip,px30-pdm", 532 .data = (void *)RK_PDM_RK3308 }, 533 { .compatible = "rockchip,rk1808-pdm", 534 .data = (void *)RK_PDM_RK3308 }, 535 { .compatible = "rockchip,rk3308-pdm", 536 .data = (void *)RK_PDM_RK3308 }, 537 { .compatible = "rockchip,rk3568-pdm", 538 .data = (void *)RK_PDM_RV1126 }, 539 { .compatible = "rockchip,rv1126-pdm", 540 .data = (void *)RK_PDM_RV1126 }, 541 {}, 542 }; 543 MODULE_DEVICE_TABLE(of, rockchip_pdm_match); 544 545 static int rockchip_pdm_path_parse(struct rk_pdm_dev *pdm, struct device_node *node) 546 { 547 unsigned int path[PDM_PATH_MAX]; 548 int cnt = 0, ret = 0, i = 0, val = 0, msk = 0; 549 550 cnt = of_count_phandle_with_args(node, "rockchip,path-map", 551 NULL); 552 if (cnt != PDM_PATH_MAX) 553 return cnt; 554 555 ret = of_property_read_u32_array(node, "rockchip,path-map", 556 path, cnt); 557 if (ret) 558 return ret; 559 560 for (i = 0; i < cnt; i++) { 561 if (path[i] >= PDM_PATH_MAX) 562 return -EINVAL; 563 msk |= PDM_PATH_MASK(i); 564 val |= PDM_PATH(i, path[i]); 565 } 566 567 regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, msk, val); 568 569 return 0; 570 } 571 572 static int rockchip_pdm_probe(struct platform_device *pdev) 573 { 574 struct device_node *node = pdev->dev.of_node; 575 const struct of_device_id *match; 576 struct rk_pdm_dev *pdm; 577 struct resource *res; 578 void __iomem *regs; 579 int ret; 580 581 pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL); 582 if (!pdm) 583 return -ENOMEM; 584 585 match = of_match_device(rockchip_pdm_match, &pdev->dev); 586 if (match) 587 pdm->version = (enum rk_pdm_version)match->data; 588 589 if (pdm->version == RK_PDM_RK3308) { 590 pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m"); 591 if (IS_ERR(pdm->reset)) 592 return PTR_ERR(pdm->reset); 593 } 594 595 regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 596 if (IS_ERR(regs)) 597 return PTR_ERR(regs); 598 599 pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs, 600 &rockchip_pdm_regmap_config); 601 if (IS_ERR(pdm->regmap)) 602 return PTR_ERR(pdm->regmap); 603 604 pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA; 605 pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 606 pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE; 607 608 pdm->dev = &pdev->dev; 609 dev_set_drvdata(&pdev->dev, pdm); 610 611 pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk"); 612 if (IS_ERR(pdm->clk)) 613 return PTR_ERR(pdm->clk); 614 615 pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk"); 616 if (IS_ERR(pdm->hclk)) 617 return PTR_ERR(pdm->hclk); 618 619 ret = clk_prepare_enable(pdm->hclk); 620 if (ret) 621 return ret; 622 623 pm_runtime_enable(&pdev->dev); 624 if (!pm_runtime_enabled(&pdev->dev)) { 625 ret = rockchip_pdm_runtime_resume(&pdev->dev); 626 if (ret) 627 goto err_pm_disable; 628 } 629 630 ret = devm_snd_soc_register_component(&pdev->dev, 631 &rockchip_pdm_component, 632 &rockchip_pdm_dai, 1); 633 634 if (ret) { 635 dev_err(&pdev->dev, "could not register dai: %d\n", ret); 636 goto err_suspend; 637 } 638 639 rockchip_pdm_rxctrl(pdm, 0); 640 641 ret = rockchip_pdm_path_parse(pdm, node); 642 if (ret != 0 && ret != -ENOENT) 643 goto err_suspend; 644 645 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); 646 if (ret) { 647 dev_err(&pdev->dev, "could not register pcm: %d\n", ret); 648 goto err_suspend; 649 } 650 651 return 0; 652 653 err_suspend: 654 if (!pm_runtime_status_suspended(&pdev->dev)) 655 rockchip_pdm_runtime_suspend(&pdev->dev); 656 err_pm_disable: 657 pm_runtime_disable(&pdev->dev); 658 659 clk_disable_unprepare(pdm->hclk); 660 661 return ret; 662 } 663 664 static int rockchip_pdm_remove(struct platform_device *pdev) 665 { 666 struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev); 667 668 pm_runtime_disable(&pdev->dev); 669 if (!pm_runtime_status_suspended(&pdev->dev)) 670 rockchip_pdm_runtime_suspend(&pdev->dev); 671 672 clk_disable_unprepare(pdm->clk); 673 clk_disable_unprepare(pdm->hclk); 674 675 return 0; 676 } 677 678 #ifdef CONFIG_PM_SLEEP 679 static int rockchip_pdm_suspend(struct device *dev) 680 { 681 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 682 683 regcache_mark_dirty(pdm->regmap); 684 685 return 0; 686 } 687 688 static int rockchip_pdm_resume(struct device *dev) 689 { 690 struct rk_pdm_dev *pdm = dev_get_drvdata(dev); 691 int ret; 692 693 ret = pm_runtime_resume_and_get(dev); 694 if (ret < 0) 695 return ret; 696 697 ret = regcache_sync(pdm->regmap); 698 699 pm_runtime_put(dev); 700 701 return ret; 702 } 703 #endif 704 705 static const struct dev_pm_ops rockchip_pdm_pm_ops = { 706 SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend, 707 rockchip_pdm_runtime_resume, NULL) 708 SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume) 709 }; 710 711 static struct platform_driver rockchip_pdm_driver = { 712 .probe = rockchip_pdm_probe, 713 .remove = rockchip_pdm_remove, 714 .driver = { 715 .name = "rockchip-pdm", 716 .of_match_table = of_match_ptr(rockchip_pdm_match), 717 .pm = &rockchip_pdm_pm_ops, 718 }, 719 }; 720 721 module_platform_driver(rockchip_pdm_driver); 722 723 MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>"); 724 MODULE_DESCRIPTION("Rockchip PDM Controller Driver"); 725 MODULE_LICENSE("GPL v2"); 726