drivers/spi/spi-axi-spi-engine.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * SPI-Engine SPI controller driver
   4  * Copyright 2015 Analog Devices Inc.
   5  *  Author: Lars-Peter Clausen <lars@metafoo.de>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/io.h>
  11 #include <linux/of.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/spi/spi.h>
  15
  16 #define SPI_ENGINE_VERSION_MAJOR(x)     ((x >> 16) & 0xff)
  17 #define SPI_ENGINE_VERSION_MINOR(x)     ((x >> 8) & 0xff)
  18 #define SPI_ENGINE_VERSION_PATCH(x)     (x & 0xff)
  19
  20 #define SPI_ENGINE_REG_VERSION                  0x00
  21
  22 #define SPI_ENGINE_REG_RESET                    0x40
  23
  24 #define SPI_ENGINE_REG_INT_ENABLE               0x80
  25 #define SPI_ENGINE_REG_INT_PENDING              0x84
  26 #define SPI_ENGINE_REG_INT_SOURCE               0x88
  27
  28 #define SPI_ENGINE_REG_SYNC_ID                  0xc0
  29
  30 #define SPI_ENGINE_REG_CMD_FIFO_ROOM            0xd0
  31 #define SPI_ENGINE_REG_SDO_FIFO_ROOM            0xd4
  32 #define SPI_ENGINE_REG_SDI_FIFO_LEVEL           0xd8
  33
  34 #define SPI_ENGINE_REG_CMD_FIFO                 0xe0
  35 #define SPI_ENGINE_REG_SDO_DATA_FIFO            0xe4
  36 #define SPI_ENGINE_REG_SDI_DATA_FIFO            0xe8
  37 #define SPI_ENGINE_REG_SDI_DATA_FIFO_PEEK       0xec
  38
  39 #define SPI_ENGINE_INT_CMD_ALMOST_EMPTY         BIT(0)
  40 #define SPI_ENGINE_INT_SDO_ALMOST_EMPTY         BIT(1)
  41 #define SPI_ENGINE_INT_SDI_ALMOST_FULL          BIT(2)
  42 #define SPI_ENGINE_INT_SYNC                     BIT(3)
  43
  44 #define SPI_ENGINE_CONFIG_CPHA                  BIT(0)
  45 #define SPI_ENGINE_CONFIG_CPOL                  BIT(1)
  46 #define SPI_ENGINE_CONFIG_3WIRE                 BIT(2)
  47
  48 #define SPI_ENGINE_INST_TRANSFER                0x0
  49 #define SPI_ENGINE_INST_ASSERT                  0x1
  50 #define SPI_ENGINE_INST_WRITE                   0x2
  51 #define SPI_ENGINE_INST_MISC                    0x3
  52
  53 #define SPI_ENGINE_CMD_REG_CLK_DIV              0x0
  54 #define SPI_ENGINE_CMD_REG_CONFIG               0x1
  55
  56 #define SPI_ENGINE_MISC_SYNC                    0x0
  57 #define SPI_ENGINE_MISC_SLEEP                   0x1
  58
  59 #define SPI_ENGINE_TRANSFER_WRITE               0x1
  60 #define SPI_ENGINE_TRANSFER_READ                0x2
  61
  62 #define SPI_ENGINE_CMD(inst, arg1, arg2) \
  63         (((inst) << 12) | ((arg1) << 8) | (arg2))
  64
  65 #define SPI_ENGINE_CMD_TRANSFER(flags, n) \
  66         SPI_ENGINE_CMD(SPI_ENGINE_INST_TRANSFER, (flags), (n))
  67 #define SPI_ENGINE_CMD_ASSERT(delay, cs) \
  68         SPI_ENGINE_CMD(SPI_ENGINE_INST_ASSERT, (delay), (cs))
  69 #define SPI_ENGINE_CMD_WRITE(reg, val) \
  70         SPI_ENGINE_CMD(SPI_ENGINE_INST_WRITE, (reg), (val))
  71 #define SPI_ENGINE_CMD_SLEEP(delay) \
  72         SPI_ENGINE_CMD(SPI_ENGINE_INST_MISC, SPI_ENGINE_MISC_SLEEP, (delay))
  73 #define SPI_ENGINE_CMD_SYNC(id) \
  74         SPI_ENGINE_CMD(SPI_ENGINE_INST_MISC, SPI_ENGINE_MISC_SYNC, (id))
  75
  76 struct spi_engine_program {
  77         unsigned int length;
  78         uint16_t instructions[];
  79 };
  80
  81 struct spi_engine {
  82         struct clk *clk;
  83         struct clk *ref_clk;
  84
  85         spinlock_t lock;
  86
  87         void __iomem *base;
  88
  89         struct spi_message *msg;
  90         struct spi_engine_program *p;
  91         unsigned cmd_length;
  92         const uint16_t *cmd_buf;
  93
  94         struct spi_transfer *tx_xfer;
  95         unsigned int tx_length;
  96         const uint8_t *tx_buf;
  97
  98         struct spi_transfer *rx_xfer;
  99         unsigned int rx_length;
 100         uint8_t *rx_buf;
 101
 102         unsigned int sync_id;
 103         unsigned int completed_id;
 104
 105         unsigned int int_enable;
 106 };
 107
 108 static void spi_engine_program_add_cmd(struct spi_engine_program *p,
 109         bool dry, uint16_t cmd)
 110 {
 111         if (!dry)
 112                 p->instructions[p->length] = cmd;
 113         p->length++;
 114 }
 115
 116 static unsigned int spi_engine_get_config(struct spi_device *spi)
 117 {
 118         unsigned int config = 0;
 119
 120         if (spi->mode & SPI_CPOL)
 121                 config |= SPI_ENGINE_CONFIG_CPOL;
 122         if (spi->mode & SPI_CPHA)
 123                 config |= SPI_ENGINE_CONFIG_CPHA;
 124         if (spi->mode & SPI_3WIRE)
 125                 config |= SPI_ENGINE_CONFIG_3WIRE;
 126
 127         return config;
 128 }
 129
 130 static unsigned int spi_engine_get_clk_div(struct spi_engine *spi_engine,
 131         struct spi_device *spi, struct spi_transfer *xfer)
 132 {
 133         unsigned int clk_div;
 134
 135         clk_div = DIV_ROUND_UP(clk_get_rate(spi_engine->ref_clk),
 136                 xfer->speed_hz * 2);
 137         if (clk_div > 255)
 138                 clk_div = 255;
 139         else if (clk_div > 0)
 140                 clk_div -= 1;
 141
 142         return clk_div;
 143 }
 144
 145 static void spi_engine_gen_xfer(struct spi_engine_program *p, bool dry,
 146         struct spi_transfer *xfer)
 147 {
 148         unsigned int len = xfer->len;
 149
 150         while (len) {
 151                 unsigned int n = min(len, 256U);
 152                 unsigned int flags = 0;
 153
 154                 if (xfer->tx_buf)
 155                         flags |= SPI_ENGINE_TRANSFER_WRITE;
 156                 if (xfer->rx_buf)
 157                         flags |= SPI_ENGINE_TRANSFER_READ;
 158
 159                 spi_engine_program_add_cmd(p, dry,
 160                         SPI_ENGINE_CMD_TRANSFER(flags, n - 1));
 161                 len -= n;
 162         }
 163 }
 164
 165 static void spi_engine_gen_sleep(struct spi_engine_program *p, bool dry,
 166         struct spi_engine *spi_engine, unsigned int clk_div, unsigned int delay)
 167 {
 168         unsigned int spi_clk = clk_get_rate(spi_engine->ref_clk);
 169         unsigned int t;
 170
 171         if (delay == 0)
 172                 return;
 173
 174         t = DIV_ROUND_UP(delay * spi_clk, (clk_div + 1) * 2);
 175         while (t) {
 176                 unsigned int n = min(t, 256U);
 177
 178                 spi_engine_program_add_cmd(p, dry, SPI_ENGINE_CMD_SLEEP(n - 1));
 179                 t -= n;
 180         }
 181 }
 182
 183 static void spi_engine_gen_cs(struct spi_engine_program *p, bool dry,
 184                 struct spi_device *spi, bool assert)
 185 {
 186         unsigned int mask = 0xff;
 187
 188         if (assert)
 189                 mask ^= BIT(spi->chip_select);
 190
 191         spi_engine_program_add_cmd(p, dry, SPI_ENGINE_CMD_ASSERT(1, mask));
 192 }
 193
 194 static int spi_engine_compile_message(struct spi_engine *spi_engine,
 195         struct spi_message *msg, bool dry, struct spi_engine_program *p)
 196 {
 197         struct spi_device *spi = msg->spi;
 198         struct spi_transfer *xfer;
 199         int clk_div, new_clk_div;
 200         bool cs_change = true;
 201
 202         clk_div = -1;
 203
 204         spi_engine_program_add_cmd(p, dry,
 205                 SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CONFIG,
 206                         spi_engine_get_config(spi)));
 207
 208         list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 209                 new_clk_div = spi_engine_get_clk_div(spi_engine, spi, xfer);
 210                 if (new_clk_div != clk_div) {
 211                         clk_div = new_clk_div;
 212                         spi_engine_program_add_cmd(p, dry,
 213                                 SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CLK_DIV,
 214                                         clk_div));
 215                 }
 216
 217                 if (cs_change)
 218                         spi_engine_gen_cs(p, dry, spi, true);
 219
 220                 spi_engine_gen_xfer(p, dry, xfer);
 221                 spi_engine_gen_sleep(p, dry, spi_engine, clk_div,
 222                         xfer->delay_usecs);
 223
 224                 cs_change = xfer->cs_change;
 225                 if (list_is_last(&xfer->transfer_list, &msg->transfers))
 226                         cs_change = !cs_change;
 227
 228                 if (cs_change)
 229                         spi_engine_gen_cs(p, dry, spi, false);
 230         }
 231
 232         return 0;
 233 }
 234
 235 static void spi_engine_xfer_next(struct spi_engine *spi_engine,
 236         struct spi_transfer **_xfer)
 237 {
 238         struct spi_message *msg = spi_engine->msg;
 239         struct spi_transfer *xfer = *_xfer;
 240
 241         if (!xfer) {
 242                 xfer = list_first_entry(&msg->transfers,
 243                         struct spi_transfer, transfer_list);
 244         } else if (list_is_last(&xfer->transfer_list, &msg->transfers)) {
 245                 xfer = NULL;
 246         } else {
 247                 xfer = list_next_entry(xfer, transfer_list);
 248         }
 249
 250         *_xfer = xfer;
 251 }
 252
 253 static void spi_engine_tx_next(struct spi_engine *spi_engine)
 254 {
 255         struct spi_transfer *xfer = spi_engine->tx_xfer;
 256
 257         do {
 258                 spi_engine_xfer_next(spi_engine, &xfer);
 259         } while (xfer && !xfer->tx_buf);
 260
 261         spi_engine->tx_xfer = xfer;
 262         if (xfer) {
 263                 spi_engine->tx_length = xfer->len;
 264                 spi_engine->tx_buf = xfer->tx_buf;
 265         } else {
 266                 spi_engine->tx_buf = NULL;
 267         }
 268 }
 269
 270 static void spi_engine_rx_next(struct spi_engine *spi_engine)
 271 {
 272         struct spi_transfer *xfer = spi_engine->rx_xfer;
 273
 274         do {
 275                 spi_engine_xfer_next(spi_engine, &xfer);
 276         } while (xfer && !xfer->rx_buf);
 277
 278         spi_engine->rx_xfer = xfer;
 279         if (xfer) {
 280                 spi_engine->rx_length = xfer->len;
 281                 spi_engine->rx_buf = xfer->rx_buf;
 282         } else {
 283                 spi_engine->rx_buf = NULL;
 284         }
 285 }
 286
 287 static bool spi_engine_write_cmd_fifo(struct spi_engine *spi_engine)
 288 {
 289         void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_CMD_FIFO;
 290         unsigned int n, m, i;
 291         const uint16_t *buf;
 292
 293         n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_CMD_FIFO_ROOM);
 294         while (n && spi_engine->cmd_length) {
 295                 m = min(n, spi_engine->cmd_length);
 296                 buf = spi_engine->cmd_buf;
 297                 for (i = 0; i < m; i++)
 298                         writel_relaxed(buf[i], addr);
 299                 spi_engine->cmd_buf += m;
 300                 spi_engine->cmd_length -= m;
 301                 n -= m;
 302         }
 303
 304         return spi_engine->cmd_length != 0;
 305 }
 306
 307 static bool spi_engine_write_tx_fifo(struct spi_engine *spi_engine)
 308 {
 309         void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_SDO_DATA_FIFO;
 310         unsigned int n, m, i;
 311         const uint8_t *buf;
 312
 313         n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_SDO_FIFO_ROOM);
 314         while (n && spi_engine->tx_length) {
 315                 m = min(n, spi_engine->tx_length);
 316                 buf = spi_engine->tx_buf;
 317                 for (i = 0; i < m; i++)
 318                         writel_relaxed(buf[i], addr);
 319                 spi_engine->tx_buf += m;
 320                 spi_engine->tx_length -= m;
 321                 n -= m;
 322                 if (spi_engine->tx_length == 0)
 323                         spi_engine_tx_next(spi_engine);
 324         }
 325
 326         return spi_engine->tx_length != 0;
 327 }
 328
 329 static bool spi_engine_read_rx_fifo(struct spi_engine *spi_engine)
 330 {
 331         void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_SDI_DATA_FIFO;
 332         unsigned int n, m, i;
 333         uint8_t *buf;
 334
 335         n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_SDI_FIFO_LEVEL);
 336         while (n && spi_engine->rx_length) {
 337                 m = min(n, spi_engine->rx_length);
 338                 buf = spi_engine->rx_buf;
 339                 for (i = 0; i < m; i++)
 340                         buf[i] = readl_relaxed(addr);
 341                 spi_engine->rx_buf += m;
 342                 spi_engine->rx_length -= m;
 343                 n -= m;
 344                 if (spi_engine->rx_length == 0)
 345                         spi_engine_rx_next(spi_engine);
 346         }
 347
 348         return spi_engine->rx_length != 0;
 349 }
 350
 351 static irqreturn_t spi_engine_irq(int irq, void *devid)
 352 {
 353         struct spi_master *master = devid;
 354         struct spi_engine *spi_engine = spi_master_get_devdata(master);
 355         unsigned int disable_int = 0;
 356         unsigned int pending;
 357
 358         pending = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 359
 360         if (pending & SPI_ENGINE_INT_SYNC) {
 361                 writel_relaxed(SPI_ENGINE_INT_SYNC,
 362                         spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 363                 spi_engine->completed_id = readl_relaxed(
 364                         spi_engine->base + SPI_ENGINE_REG_SYNC_ID);
 365         }
 366
 367         spin_lock(&spi_engine->lock);
 368
 369         if (pending & SPI_ENGINE_INT_CMD_ALMOST_EMPTY) {
 370                 if (!spi_engine_write_cmd_fifo(spi_engine))
 371                         disable_int |= SPI_ENGINE_INT_CMD_ALMOST_EMPTY;
 372         }
 373
 374         if (pending & SPI_ENGINE_INT_SDO_ALMOST_EMPTY) {
 375                 if (!spi_engine_write_tx_fifo(spi_engine))
 376                         disable_int |= SPI_ENGINE_INT_SDO_ALMOST_EMPTY;
 377         }
 378
 379         if (pending & (SPI_ENGINE_INT_SDI_ALMOST_FULL | SPI_ENGINE_INT_SYNC)) {
 380                 if (!spi_engine_read_rx_fifo(spi_engine))
 381                         disable_int |= SPI_ENGINE_INT_SDI_ALMOST_FULL;
 382         }
 383
 384         if (pending & SPI_ENGINE_INT_SYNC) {
 385                 if (spi_engine->msg &&
 386                     spi_engine->completed_id == spi_engine->sync_id) {
 387                         struct spi_message *msg = spi_engine->msg;
 388
 389                         kfree(spi_engine->p);
 390                         msg->status = 0;
 391                         msg->actual_length = msg->frame_length;
 392                         spi_engine->msg = NULL;
 393                         spi_finalize_current_message(master);
 394                         disable_int |= SPI_ENGINE_INT_SYNC;
 395                 }
 396         }
 397
 398         if (disable_int) {
 399                 spi_engine->int_enable &= ~disable_int;
 400                 writel_relaxed(spi_engine->int_enable,
 401                         spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 402         }
 403
 404         spin_unlock(&spi_engine->lock);
 405
 406         return IRQ_HANDLED;
 407 }
 408
 409 static int spi_engine_transfer_one_message(struct spi_master *master,
 410         struct spi_message *msg)
 411 {
 412         struct spi_engine_program p_dry, *p;
 413         struct spi_engine *spi_engine = spi_master_get_devdata(master);
 414         unsigned int int_enable = 0;
 415         unsigned long flags;
 416         size_t size;
 417
 418         p_dry.length = 0;
 419         spi_engine_compile_message(spi_engine, msg, true, &p_dry);
 420
 421         size = sizeof(*p->instructions) * (p_dry.length + 1);
 422         p = kzalloc(sizeof(*p) + size, GFP_KERNEL);
 423         if (!p)
 424                 return -ENOMEM;
 425         spi_engine_compile_message(spi_engine, msg, false, p);
 426
 427         spin_lock_irqsave(&spi_engine->lock, flags);
 428         spi_engine->sync_id = (spi_engine->sync_id + 1) & 0xff;
 429         spi_engine_program_add_cmd(p, false,
 430                 SPI_ENGINE_CMD_SYNC(spi_engine->sync_id));
 431
 432         spi_engine->msg = msg;
 433         spi_engine->p = p;
 434
 435         spi_engine->cmd_buf = p->instructions;
 436         spi_engine->cmd_length = p->length;
 437         if (spi_engine_write_cmd_fifo(spi_engine))
 438                 int_enable |= SPI_ENGINE_INT_CMD_ALMOST_EMPTY;
 439
 440         spi_engine_tx_next(spi_engine);
 441         if (spi_engine_write_tx_fifo(spi_engine))
 442                 int_enable |= SPI_ENGINE_INT_SDO_ALMOST_EMPTY;
 443
 444         spi_engine_rx_next(spi_engine);
 445         if (spi_engine->rx_length != 0)
 446                 int_enable |= SPI_ENGINE_INT_SDI_ALMOST_FULL;
 447
 448         int_enable |= SPI_ENGINE_INT_SYNC;
 449
 450         writel_relaxed(int_enable,
 451                 spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 452         spi_engine->int_enable = int_enable;
 453         spin_unlock_irqrestore(&spi_engine->lock, flags);
 454
 455         return 0;
 456 }
 457
 458 static int spi_engine_probe(struct platform_device *pdev)
 459 {
 460         struct spi_engine *spi_engine;
 461         struct spi_master *master;
 462         unsigned int version;
 463         int irq;
 464         int ret;
 465
 466         irq = platform_get_irq(pdev, 0);
 467         if (irq <= 0)
 468                 return -ENXIO;
 469
 470         spi_engine = devm_kzalloc(&pdev->dev, sizeof(*spi_engine), GFP_KERNEL);
 471         if (!spi_engine)
 472                 return -ENOMEM;
 473
 474         master = spi_alloc_master(&pdev->dev, 0);
 475         if (!master)
 476                 return -ENOMEM;
 477
 478         spi_master_set_devdata(master, spi_engine);
 479
 480         spin_lock_init(&spi_engine->lock);
 481
 482         spi_engine->base = devm_platform_ioremap_resource(pdev, 0);
 483         if (IS_ERR(spi_engine->base)) {
 484                 ret = PTR_ERR(spi_engine->base);
 485                 goto err_put_master;
 486         }
 487
 488         version = readl(spi_engine->base + SPI_ENGINE_REG_VERSION);
 489         if (SPI_ENGINE_VERSION_MAJOR(version) != 1) {
 490                 dev_err(&pdev->dev, "Unsupported peripheral version %u.%u.%c\n",
 491                         SPI_ENGINE_VERSION_MAJOR(version),
 492                         SPI_ENGINE_VERSION_MINOR(version),
 493                         SPI_ENGINE_VERSION_PATCH(version));
 494                 ret = -ENODEV;
 495                 goto err_put_master;
 496         }
 497
 498         spi_engine->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
 499         if (IS_ERR(spi_engine->clk)) {
 500                 ret = PTR_ERR(spi_engine->clk);
 501                 goto err_put_master;
 502         }
 503
 504         spi_engine->ref_clk = devm_clk_get(&pdev->dev, "spi_clk");
 505         if (IS_ERR(spi_engine->ref_clk)) {
 506                 ret = PTR_ERR(spi_engine->ref_clk);
 507                 goto err_put_master;
 508         }
 509
 510         ret = clk_prepare_enable(spi_engine->clk);
 511         if (ret)
 512                 goto err_put_master;
 513
 514         ret = clk_prepare_enable(spi_engine->ref_clk);
 515         if (ret)
 516                 goto err_clk_disable;
 517
 518         writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_RESET);
 519         writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 520         writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 521
 522         ret = request_irq(irq, spi_engine_irq, 0, pdev->name, master);
 523         if (ret)
 524                 goto err_ref_clk_disable;
 525
 526         master->dev.of_node = pdev->dev.of_node;
 527         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE;
 528         master->bits_per_word_mask = SPI_BPW_MASK(8);
 529         master->max_speed_hz = clk_get_rate(spi_engine->ref_clk) / 2;
 530         master->transfer_one_message = spi_engine_transfer_one_message;
 531         master->num_chipselect = 8;
 532
 533         ret = spi_register_master(master);
 534         if (ret)
 535                 goto err_free_irq;
 536
 537         platform_set_drvdata(pdev, master);
 538
 539         return 0;
 540 err_free_irq:
 541         free_irq(irq, master);
 542 err_ref_clk_disable:
 543         clk_disable_unprepare(spi_engine->ref_clk);
 544 err_clk_disable:
 545         clk_disable_unprepare(spi_engine->clk);
 546 err_put_master:
 547         spi_master_put(master);
 548         return ret;
 549 }
 550
 551 static int spi_engine_remove(struct platform_device *pdev)
 552 {
 553         struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
 554         struct spi_engine *spi_engine = spi_master_get_devdata(master);
 555         int irq = platform_get_irq(pdev, 0);
 556
 557         spi_unregister_master(master);
 558
 559         free_irq(irq, master);
 560
 561         spi_master_put(master);
 562
 563         writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 564         writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 565         writel_relaxed(0x01, spi_engine->base + SPI_ENGINE_REG_RESET);
 566
 567         clk_disable_unprepare(spi_engine->ref_clk);
 568         clk_disable_unprepare(spi_engine->clk);
 569
 570         return 0;
 571 }
 572
 573 static const struct of_device_id spi_engine_match_table[] = {
 574         { .compatible = "adi,axi-spi-engine-1.00.a" },
 575         { },
 576 };
 577 MODULE_DEVICE_TABLE(of, spi_engine_match_table);
 578
 579 static struct platform_driver spi_engine_driver = {
 580         .probe = spi_engine_probe,
 581         .remove = spi_engine_remove,
 582         .driver = {
 583                 .name = "spi-engine",
 584                 .of_match_table = spi_engine_match_table,
 585         },
 586 };
 587 module_platform_driver(spi_engine_driver);
 588
 589 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 590 MODULE_DESCRIPTION("Analog Devices SPI engine peripheral driver");
 591 MODULE_LICENSE("GPL");