drivers/media/platform/atmel/microchip-csi2dc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Microchip CSI2 Demux Controller (CSI2DC) driver
   4  *
   5  * Copyright (C) 2018 Microchip Technology, Inc.
   6  *
   7  * Author: Eugen Hristev <eugen.hristev@microchip.com>
   8  *
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/module.h>
  14 #include <linux/of_graph.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/videodev2.h>
  18
  19 #include <media/v4l2-fwnode.h>
  20 #include <media/v4l2-subdev.h>
  21
  22 /* Global configuration register */
  23 #define CSI2DC_GCFG                     0x0
  24
  25 /* MIPI sensor pixel clock is free running */
  26 #define CSI2DC_GCFG_MIPIFRN             BIT(0)
  27 /* GPIO parallel interface selection */
  28 #define CSI2DC_GCFG_GPIOSEL             BIT(1)
  29 /* Output waveform inter-line minimum delay */
  30 #define CSI2DC_GCFG_HLC(v)              ((v) << 4)
  31 #define CSI2DC_GCFG_HLC_MASK            GENMASK(7, 4)
  32 /* SAMA7G5 requires a HLC delay of 15 */
  33 #define SAMA7G5_HLC                     (15)
  34
  35 /* Global control register */
  36 #define CSI2DC_GCTLR                    0x04
  37 #define CSI2DC_GCTLR_SWRST              BIT(0)
  38
  39 /* Global status register */
  40 #define CSI2DC_GS                       0x08
  41
  42 /* SSP interrupt status register */
  43 #define CSI2DC_SSPIS                    0x28
  44 /* Pipe update register */
  45 #define CSI2DC_PU                       0xc0
  46 /* Video pipe attributes update */
  47 #define CSI2DC_PU_VP                    BIT(0)
  48
  49 /* Pipe update status register */
  50 #define CSI2DC_PUS                      0xc4
  51
  52 /* Video pipeline Interrupt Status Register */
  53 #define CSI2DC_VPISR                    0xf4
  54
  55 /* Video pipeline enable register */
  56 #define CSI2DC_VPE                      0xf8
  57 #define CSI2DC_VPE_ENABLE               BIT(0)
  58
  59 /* Video pipeline configuration register */
  60 #define CSI2DC_VPCFG                    0xfc
  61 /* Data type */
  62 #define CSI2DC_VPCFG_DT(v)              ((v) << 0)
  63 #define CSI2DC_VPCFG_DT_MASK            GENMASK(5, 0)
  64 /* Virtual channel identifier */
  65 #define CSI2DC_VPCFG_VC(v)              ((v) << 6)
  66 #define CSI2DC_VPCFG_VC_MASK            GENMASK(7, 6)
  67 /* Decompression enable */
  68 #define CSI2DC_VPCFG_DE                 BIT(8)
  69 /* Decoder mode */
  70 #define CSI2DC_VPCFG_DM(v)              ((v) << 9)
  71 #define CSI2DC_VPCFG_DM_DECODER8TO12    0
  72 /* Decoder predictor 2 selection */
  73 #define CSI2DC_VPCFG_DP2                BIT(12)
  74 /* Recommended memory storage */
  75 #define CSI2DC_VPCFG_RMS                BIT(13)
  76 /* Post adjustment */
  77 #define CSI2DC_VPCFG_PA                 BIT(14)
  78
  79 /* Video pipeline column register */
  80 #define CSI2DC_VPCOL                    0x100
  81 /* Column number */
  82 #define CSI2DC_VPCOL_COL(v)             ((v) << 0)
  83 #define CSI2DC_VPCOL_COL_MASK           GENMASK(15, 0)
  84
  85 /* Video pipeline row register */
  86 #define CSI2DC_VPROW                    0x104
  87 /* Row number */
  88 #define CSI2DC_VPROW_ROW(v)             ((v) << 0)
  89 #define CSI2DC_VPROW_ROW_MASK           GENMASK(15, 0)
  90
  91 /* Version register */
  92 #define CSI2DC_VERSION                  0x1fc
  93
  94 /* register read/write helpers */
  95 #define csi2dc_readl(st, reg)           readl_relaxed((st)->base + (reg))
  96 #define csi2dc_writel(st, reg, val)     writel_relaxed((val), \
  97                                         (st)->base + (reg))
  98
  99 /* supported RAW data types */
 100 #define CSI2DC_DT_RAW6                  0x28
 101 #define CSI2DC_DT_RAW7                  0x29
 102 #define CSI2DC_DT_RAW8                  0x2a
 103 #define CSI2DC_DT_RAW10                 0x2b
 104 #define CSI2DC_DT_RAW12                 0x2c
 105 #define CSI2DC_DT_RAW14                 0x2d
 106 /* YUV data types */
 107 #define CSI2DC_DT_YUV422_8B             0x1e
 108
 109 /*
 110  * struct csi2dc_format - CSI2DC format type struct
 111  * @mbus_code:          Media bus code for the format
 112  * @dt:                 Data type constant for this format
 113  */
 114 struct csi2dc_format {
 115         u32                             mbus_code;
 116         u32                             dt;
 117 };
 118
 119 static const struct csi2dc_format csi2dc_formats[] = {
 120         {
 121                 .mbus_code =            MEDIA_BUS_FMT_SRGGB8_1X8,
 122                 .dt =                   CSI2DC_DT_RAW8,
 123         }, {
 124                 .mbus_code =            MEDIA_BUS_FMT_SBGGR8_1X8,
 125                 .dt =                   CSI2DC_DT_RAW8,
 126         }, {
 127                 .mbus_code =            MEDIA_BUS_FMT_SGRBG8_1X8,
 128                 .dt =                   CSI2DC_DT_RAW8,
 129         }, {
 130                 .mbus_code =            MEDIA_BUS_FMT_SGBRG8_1X8,
 131                 .dt =                   CSI2DC_DT_RAW8,
 132         }, {
 133                 .mbus_code =            MEDIA_BUS_FMT_SRGGB10_1X10,
 134                 .dt =                   CSI2DC_DT_RAW10,
 135         }, {
 136                 .mbus_code =            MEDIA_BUS_FMT_SBGGR10_1X10,
 137                 .dt =                   CSI2DC_DT_RAW10,
 138         }, {
 139                 .mbus_code =            MEDIA_BUS_FMT_SGRBG10_1X10,
 140                 .dt =                   CSI2DC_DT_RAW10,
 141         }, {
 142                 .mbus_code =            MEDIA_BUS_FMT_SGBRG10_1X10,
 143                 .dt =                   CSI2DC_DT_RAW10,
 144         }, {
 145                 .mbus_code =            MEDIA_BUS_FMT_YUYV8_2X8,
 146                 .dt =                   CSI2DC_DT_YUV422_8B,
 147         },
 148 };
 149
 150 enum mipi_csi_pads {
 151         CSI2DC_PAD_SINK                 = 0,
 152         CSI2DC_PAD_SOURCE               = 1,
 153         CSI2DC_PADS_NUM                 = 2,
 154 };
 155
 156 /*
 157  * struct csi2dc_device - CSI2DC device driver data/config struct
 158  * @base:               Register map base address
 159  * @csi2dc_sd:          v4l2 subdevice for the csi2dc device
 160  *                      This is the subdevice that the csi2dc device itself
 161  *                      registers in v4l2 subsystem
 162  * @dev:                struct device for this csi2dc device
 163  * @pclk:               Peripheral clock reference
 164  *                      Input clock that clocks the hardware block internal
 165  *                      logic
 166  * @scck:               Sensor Controller clock reference
 167  *                      Input clock that is used to generate the pixel clock
 168  * @format:             Current saved format used in g/s fmt
 169  * @cur_fmt:            Current state format
 170  * @try_fmt:            Try format that is being tried
 171  * @pads:               Media entity pads for the csi2dc subdevice
 172  * @clk_gated:          Whether the clock is gated or free running
 173  * @video_pipe:         Whether video pipeline is configured
 174  * @parallel_mode:      The underlying subdevice is connected on a parallel bus
 175  * @vc:                 Current set virtual channel
 176  * @notifier:           Async notifier that is used to bound the underlying
 177  *                      subdevice to the csi2dc subdevice
 178  * @input_sd:           Reference to the underlying subdevice bound to the
 179  *                      csi2dc subdevice
 180  * @remote_pad:         Pad number of the underlying subdevice that is linked
 181  *                      to the csi2dc subdevice sink pad.
 182  */
 183 struct csi2dc_device {
 184         void __iomem                    *base;
 185         struct v4l2_subdev              csi2dc_sd;
 186         struct device                   *dev;
 187         struct clk                      *pclk;
 188         struct clk                      *scck;
 189
 190         struct v4l2_mbus_framefmt        format;
 191
 192         const struct csi2dc_format      *cur_fmt;
 193         const struct csi2dc_format      *try_fmt;
 194
 195         struct media_pad                pads[CSI2DC_PADS_NUM];
 196
 197         bool                            clk_gated;
 198         bool                            video_pipe;
 199         bool                            parallel_mode;
 200         u32                             vc;
 201
 202         struct v4l2_async_notifier      notifier;
 203
 204         struct v4l2_subdev              *input_sd;
 205
 206         u32                             remote_pad;
 207 };
 208
 209 static inline struct csi2dc_device *
 210 csi2dc_sd_to_csi2dc_device(struct v4l2_subdev *csi2dc_sd)
 211 {
 212         return container_of(csi2dc_sd, struct csi2dc_device, csi2dc_sd);
 213 }
 214
 215 static int csi2dc_enum_mbus_code(struct v4l2_subdev *csi2dc_sd,
 216                                  struct v4l2_subdev_state *sd_state,
 217                                  struct v4l2_subdev_mbus_code_enum *code)
 218 {
 219         if (code->index >= ARRAY_SIZE(csi2dc_formats))
 220                 return -EINVAL;
 221
 222         code->code = csi2dc_formats[code->index].mbus_code;
 223
 224         return 0;
 225 }
 226
 227 static int csi2dc_get_fmt(struct v4l2_subdev *csi2dc_sd,
 228                           struct v4l2_subdev_state *sd_state,
 229                           struct v4l2_subdev_format *format)
 230 {
 231         struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
 232         struct v4l2_mbus_framefmt *v4l2_try_fmt;
 233
 234         if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 235                 v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state,
 236                                                           format->pad);
 237                 format->format = *v4l2_try_fmt;
 238
 239                 return 0;
 240         }
 241
 242         format->format = csi2dc->format;
 243
 244         return 0;
 245 }
 246
 247 static int csi2dc_set_fmt(struct v4l2_subdev *csi2dc_sd,
 248                           struct v4l2_subdev_state *sd_state,
 249                           struct v4l2_subdev_format *req_fmt)
 250 {
 251         struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
 252         const struct csi2dc_format *fmt, *try_fmt = NULL;
 253         struct v4l2_mbus_framefmt *v4l2_try_fmt;
 254         unsigned int i;
 255
 256         /*
 257          * Setting the source pad is disabled.
 258          * The same format is being propagated from the sink to source.
 259          */
 260         if (req_fmt->pad == CSI2DC_PAD_SOURCE)
 261                 return -EINVAL;
 262
 263         for (i = 0; i < ARRAY_SIZE(csi2dc_formats);  i++) {
 264                 fmt = &csi2dc_formats[i];
 265                 if (req_fmt->format.code == fmt->mbus_code)
 266                         try_fmt = fmt;
 267                 fmt++;
 268         }
 269
 270         /* in case we could not find the desired format, default to something */
 271         if (!try_fmt) {
 272                 try_fmt = &csi2dc_formats[0];
 273
 274                 dev_dbg(csi2dc->dev,
 275                         "CSI2DC unsupported format 0x%x, defaulting to 0x%x\n",
 276                         req_fmt->format.code, csi2dc_formats[0].mbus_code);
 277         }
 278
 279         req_fmt->format.code = try_fmt->mbus_code;
 280         req_fmt->format.colorspace = V4L2_COLORSPACE_SRGB;
 281         req_fmt->format.field = V4L2_FIELD_NONE;
 282
 283         if (req_fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
 284                 v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state,
 285                                                           req_fmt->pad);
 286                 *v4l2_try_fmt = req_fmt->format;
 287                 /* Trying on the sink pad makes the source pad change too */
 288                 v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd,
 289                                                           sd_state,
 290                                                           CSI2DC_PAD_SOURCE);
 291                 *v4l2_try_fmt = req_fmt->format;
 292
 293                 /* if we are just trying, we are done */
 294                 return 0;
 295         }
 296
 297         /* save the format for later requests */
 298         csi2dc->format = req_fmt->format;
 299
 300         /* update config */
 301         csi2dc->cur_fmt = try_fmt;
 302
 303         dev_dbg(csi2dc->dev, "new format set: 0x%x @%dx%d\n",
 304                 csi2dc->format.code, csi2dc->format.width,
 305                 csi2dc->format.height);
 306
 307         return 0;
 308 }
 309
 310 static int csi2dc_power(struct csi2dc_device *csi2dc, int on)
 311 {
 312         int ret = 0;
 313
 314         if (on) {
 315                 ret = clk_prepare_enable(csi2dc->pclk);
 316                 if (ret) {
 317                         dev_err(csi2dc->dev, "failed to enable pclk:%d\n", ret);
 318                         return ret;
 319                 }
 320
 321                 ret = clk_prepare_enable(csi2dc->scck);
 322                 if (ret) {
 323                         dev_err(csi2dc->dev, "failed to enable scck:%d\n", ret);
 324                         clk_disable_unprepare(csi2dc->pclk);
 325                         return ret;
 326                 }
 327
 328                 /* if powering up, deassert reset line */
 329                 csi2dc_writel(csi2dc, CSI2DC_GCTLR, CSI2DC_GCTLR_SWRST);
 330         } else {
 331                 /* if powering down, assert reset line */
 332                 csi2dc_writel(csi2dc, CSI2DC_GCTLR, 0);
 333
 334                 clk_disable_unprepare(csi2dc->scck);
 335                 clk_disable_unprepare(csi2dc->pclk);
 336         }
 337
 338         return ret;
 339 }
 340
 341 static int csi2dc_get_mbus_config(struct csi2dc_device *csi2dc)
 342 {
 343         struct v4l2_mbus_config mbus_config = { 0 };
 344         int ret;
 345
 346         ret = v4l2_subdev_call(csi2dc->input_sd, pad, get_mbus_config,
 347                                csi2dc->remote_pad, &mbus_config);
 348         if (ret == -ENOIOCTLCMD) {
 349                 dev_dbg(csi2dc->dev,
 350                         "no remote mbus configuration available\n");
 351                 return 0;
 352         }
 353
 354         if (ret) {
 355                 dev_err(csi2dc->dev,
 356                         "failed to get remote mbus configuration\n");
 357                 return 0;
 358         }
 359
 360         dev_dbg(csi2dc->dev, "subdev sending on channel %d\n", csi2dc->vc);
 361
 362         csi2dc->clk_gated = mbus_config.bus.parallel.flags &
 363                                 V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
 364
 365         dev_dbg(csi2dc->dev, "mbus_config: %s clock\n",
 366                 csi2dc->clk_gated ? "gated" : "free running");
 367
 368         return 0;
 369 }
 370
 371 static void csi2dc_vp_update(struct csi2dc_device *csi2dc)
 372 {
 373         u32 vp, gcfg;
 374
 375         if (!csi2dc->video_pipe) {
 376                 dev_err(csi2dc->dev, "video pipeline unavailable\n");
 377                 return;
 378         }
 379
 380         if (csi2dc->parallel_mode) {
 381                 /* In parallel mode, GPIO parallel interface must be selected */
 382                 gcfg = csi2dc_readl(csi2dc, CSI2DC_GCFG);
 383                 gcfg |= CSI2DC_GCFG_GPIOSEL;
 384                 csi2dc_writel(csi2dc, CSI2DC_GCFG, gcfg);
 385                 return;
 386         }
 387
 388         /* serial video pipeline */
 389
 390         csi2dc_writel(csi2dc, CSI2DC_GCFG,
 391                       (SAMA7G5_HLC & CSI2DC_GCFG_HLC_MASK) |
 392                       (csi2dc->clk_gated ? 0 : CSI2DC_GCFG_MIPIFRN));
 393
 394         vp = CSI2DC_VPCFG_DT(csi2dc->cur_fmt->dt) & CSI2DC_VPCFG_DT_MASK;
 395         vp |= CSI2DC_VPCFG_VC(csi2dc->vc) & CSI2DC_VPCFG_VC_MASK;
 396         vp &= ~CSI2DC_VPCFG_DE;
 397         vp |= CSI2DC_VPCFG_DM(CSI2DC_VPCFG_DM_DECODER8TO12);
 398         vp &= ~CSI2DC_VPCFG_DP2;
 399         vp &= ~CSI2DC_VPCFG_RMS;
 400         vp |= CSI2DC_VPCFG_PA;
 401
 402         csi2dc_writel(csi2dc, CSI2DC_VPCFG, vp);
 403         csi2dc_writel(csi2dc, CSI2DC_VPE, CSI2DC_VPE_ENABLE);
 404         csi2dc_writel(csi2dc, CSI2DC_PU, CSI2DC_PU_VP);
 405 }
 406
 407 static int csi2dc_s_stream(struct v4l2_subdev *csi2dc_sd, int enable)
 408 {
 409         struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
 410         int ret;
 411
 412         if (enable) {
 413                 ret = pm_runtime_resume_and_get(csi2dc->dev);
 414                 if (ret < 0)
 415                         return ret;
 416
 417                 csi2dc_get_mbus_config(csi2dc);
 418
 419                 csi2dc_vp_update(csi2dc);
 420
 421                 return v4l2_subdev_call(csi2dc->input_sd, video, s_stream,
 422                                         true);
 423         }
 424
 425         dev_dbg(csi2dc->dev,
 426                 "Last frame received: VPCOLR = %u, VPROWR= %u, VPISR = %x\n",
 427                 csi2dc_readl(csi2dc, CSI2DC_VPCOL),
 428                 csi2dc_readl(csi2dc, CSI2DC_VPROW),
 429                 csi2dc_readl(csi2dc, CSI2DC_VPISR));
 430
 431         /* stop streaming scenario */
 432         ret = v4l2_subdev_call(csi2dc->input_sd, video, s_stream, false);
 433
 434         pm_runtime_put_sync(csi2dc->dev);
 435
 436         return ret;
 437 }
 438
 439 static int csi2dc_init_cfg(struct v4l2_subdev *csi2dc_sd,
 440                            struct v4l2_subdev_state *sd_state)
 441 {
 442         struct v4l2_mbus_framefmt *v4l2_try_fmt =
 443                 v4l2_subdev_get_try_format(csi2dc_sd, sd_state, 0);
 444
 445         v4l2_try_fmt->height = 480;
 446         v4l2_try_fmt->width = 640;
 447         v4l2_try_fmt->code = csi2dc_formats[0].mbus_code;
 448         v4l2_try_fmt->colorspace = V4L2_COLORSPACE_SRGB;
 449         v4l2_try_fmt->field = V4L2_FIELD_NONE;
 450         v4l2_try_fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
 451         v4l2_try_fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
 452         v4l2_try_fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
 453
 454         return 0;
 455 }
 456
 457 static const struct media_entity_operations csi2dc_entity_ops = {
 458         .link_validate = v4l2_subdev_link_validate,
 459 };
 460
 461 static const struct v4l2_subdev_pad_ops csi2dc_pad_ops = {
 462         .enum_mbus_code = csi2dc_enum_mbus_code,
 463         .set_fmt = csi2dc_set_fmt,
 464         .get_fmt = csi2dc_get_fmt,
 465         .init_cfg = csi2dc_init_cfg,
 466 };
 467
 468 static const struct v4l2_subdev_video_ops csi2dc_video_ops = {
 469         .s_stream = csi2dc_s_stream,
 470 };
 471
 472 static const struct v4l2_subdev_ops csi2dc_subdev_ops = {
 473         .pad = &csi2dc_pad_ops,
 474         .video = &csi2dc_video_ops,
 475 };
 476
 477 static int csi2dc_async_bound(struct v4l2_async_notifier *notifier,
 478                               struct v4l2_subdev *subdev,
 479                               struct v4l2_async_subdev *asd)
 480 {
 481         struct csi2dc_device *csi2dc = container_of(notifier,
 482                                                 struct csi2dc_device, notifier);
 483         int pad;
 484         int ret;
 485
 486         csi2dc->input_sd = subdev;
 487
 488         pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
 489                                           MEDIA_PAD_FL_SOURCE);
 490         if (pad < 0) {
 491                 dev_err(csi2dc->dev, "Failed to find pad for %s\n",
 492                         subdev->name);
 493                 return pad;
 494         }
 495
 496         csi2dc->remote_pad = pad;
 497
 498         ret = media_create_pad_link(&csi2dc->input_sd->entity,
 499                                     csi2dc->remote_pad,
 500                                     &csi2dc->csi2dc_sd.entity, 0,
 501                                     MEDIA_LNK_FL_ENABLED);
 502         if (ret) {
 503                 dev_err(csi2dc->dev,
 504                         "Failed to create pad link: %s to %s\n",
 505                         csi2dc->input_sd->entity.name,
 506                         csi2dc->csi2dc_sd.entity.name);
 507                 return ret;
 508         }
 509
 510         dev_dbg(csi2dc->dev, "link with %s pad: %d\n",
 511                 csi2dc->input_sd->name, csi2dc->remote_pad);
 512
 513         return ret;
 514 }
 515
 516 static const struct v4l2_async_notifier_operations csi2dc_async_ops = {
 517         .bound = csi2dc_async_bound,
 518 };
 519
 520 static int csi2dc_prepare_notifier(struct csi2dc_device *csi2dc,
 521                                    struct fwnode_handle *input_fwnode)
 522 {
 523         struct v4l2_async_subdev *asd;
 524         int ret = 0;
 525
 526         v4l2_async_nf_init(&csi2dc->notifier);
 527
 528         asd = v4l2_async_nf_add_fwnode_remote(&csi2dc->notifier,
 529                                               input_fwnode,
 530                                               struct v4l2_async_subdev);
 531
 532         fwnode_handle_put(input_fwnode);
 533
 534         if (IS_ERR(asd)) {
 535                 ret = PTR_ERR(asd);
 536                 dev_err(csi2dc->dev,
 537                         "failed to add async notifier for node %pOF: %d\n",
 538                         to_of_node(input_fwnode), ret);
 539                 v4l2_async_nf_cleanup(&csi2dc->notifier);
 540                 return ret;
 541         }
 542
 543         csi2dc->notifier.ops = &csi2dc_async_ops;
 544
 545         ret = v4l2_async_subdev_nf_register(&csi2dc->csi2dc_sd,
 546                                             &csi2dc->notifier);
 547         if (ret) {
 548                 dev_err(csi2dc->dev, "fail to register async notifier: %d\n",
 549                         ret);
 550                 v4l2_async_nf_cleanup(&csi2dc->notifier);
 551         }
 552
 553         return ret;
 554 }
 555
 556 static int csi2dc_of_parse(struct csi2dc_device *csi2dc,
 557                            struct device_node *of_node)
 558 {
 559         struct fwnode_handle *input_fwnode, *output_fwnode;
 560         struct v4l2_fwnode_endpoint input_endpoint = { 0 },
 561                                     output_endpoint = { 0 };
 562         int ret;
 563
 564         input_fwnode = fwnode_graph_get_next_endpoint(of_fwnode_handle(of_node),
 565                                                       NULL);
 566         if (!input_fwnode) {
 567                 dev_err(csi2dc->dev,
 568                         "missing port node at %pOF, input node is mandatory.\n",
 569                         of_node);
 570                 return -EINVAL;
 571         }
 572
 573         ret = v4l2_fwnode_endpoint_parse(input_fwnode, &input_endpoint);
 574         if (ret) {
 575                 dev_err(csi2dc->dev, "endpoint not defined at %pOF\n", of_node);
 576                 goto csi2dc_of_parse_err;
 577         }
 578
 579         if (input_endpoint.bus_type == V4L2_MBUS_PARALLEL ||
 580             input_endpoint.bus_type == V4L2_MBUS_BT656) {
 581                 csi2dc->parallel_mode = true;
 582                 dev_dbg(csi2dc->dev,
 583                         "subdevice connected on parallel interface\n");
 584         }
 585
 586         if (input_endpoint.bus_type == V4L2_MBUS_CSI2_DPHY) {
 587                 csi2dc->clk_gated = input_endpoint.bus.mipi_csi2.flags &
 588                                         V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
 589                 dev_dbg(csi2dc->dev,
 590                         "subdevice connected on serial interface\n");
 591                 dev_dbg(csi2dc->dev, "DT: %s clock\n",
 592                         csi2dc->clk_gated ? "gated" : "free running");
 593         }
 594
 595         output_fwnode = fwnode_graph_get_next_endpoint
 596                                 (of_fwnode_handle(of_node), input_fwnode);
 597
 598         if (output_fwnode)
 599                 ret = v4l2_fwnode_endpoint_parse(output_fwnode,
 600                                                  &output_endpoint);
 601
 602         fwnode_handle_put(output_fwnode);
 603
 604         if (!output_fwnode || ret) {
 605                 dev_info(csi2dc->dev,
 606                          "missing output node at %pOF, data pipe available only.\n",
 607                          of_node);
 608         } else {
 609                 if (output_endpoint.bus_type != V4L2_MBUS_PARALLEL &&
 610                     output_endpoint.bus_type != V4L2_MBUS_BT656) {
 611                         dev_err(csi2dc->dev,
 612                                 "output port must be parallel/bt656.\n");
 613                         ret = -EINVAL;
 614                         goto csi2dc_of_parse_err;
 615                 }
 616
 617                 csi2dc->video_pipe = true;
 618
 619                 dev_dbg(csi2dc->dev,
 620                         "block %pOF [%d.%d]->[%d.%d] video pipeline\n",
 621                         of_node, input_endpoint.base.port,
 622                         input_endpoint.base.id, output_endpoint.base.port,
 623                         output_endpoint.base.id);
 624         }
 625
 626         /* prepare async notifier for subdevice completion */
 627         return csi2dc_prepare_notifier(csi2dc, input_fwnode);
 628
 629 csi2dc_of_parse_err:
 630         fwnode_handle_put(input_fwnode);
 631         return ret;
 632 }
 633
 634 static void csi2dc_default_format(struct csi2dc_device *csi2dc)
 635 {
 636         csi2dc->cur_fmt = &csi2dc_formats[0];
 637
 638         csi2dc->format.height = 480;
 639         csi2dc->format.width = 640;
 640         csi2dc->format.code = csi2dc_formats[0].mbus_code;
 641         csi2dc->format.colorspace = V4L2_COLORSPACE_SRGB;
 642         csi2dc->format.field = V4L2_FIELD_NONE;
 643         csi2dc->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
 644         csi2dc->format.quantization = V4L2_QUANTIZATION_DEFAULT;
 645         csi2dc->format.xfer_func = V4L2_XFER_FUNC_DEFAULT;
 646 }
 647
 648 static int csi2dc_probe(struct platform_device *pdev)
 649 {
 650         struct device *dev = &pdev->dev;
 651         struct csi2dc_device *csi2dc;
 652         int ret = 0;
 653         u32 ver;
 654
 655         csi2dc = devm_kzalloc(dev, sizeof(*csi2dc), GFP_KERNEL);
 656         if (!csi2dc)
 657                 return -ENOMEM;
 658
 659         csi2dc->dev = dev;
 660
 661         csi2dc->base = devm_platform_ioremap_resource(pdev, 0);
 662         if (IS_ERR(csi2dc->base)) {
 663                 dev_err(dev, "base address not set\n");
 664                 return PTR_ERR(csi2dc->base);
 665         }
 666
 667         csi2dc->pclk = devm_clk_get(dev, "pclk");
 668         if (IS_ERR(csi2dc->pclk)) {
 669                 ret = PTR_ERR(csi2dc->pclk);
 670                 dev_err(dev, "failed to get pclk: %d\n", ret);
 671                 return ret;
 672         }
 673
 674         csi2dc->scck = devm_clk_get(dev, "scck");
 675         if (IS_ERR(csi2dc->scck)) {
 676                 ret = PTR_ERR(csi2dc->scck);
 677                 dev_err(dev, "failed to get scck: %d\n", ret);
 678                 return ret;
 679         }
 680
 681         v4l2_subdev_init(&csi2dc->csi2dc_sd, &csi2dc_subdev_ops);
 682
 683         csi2dc->csi2dc_sd.owner = THIS_MODULE;
 684         csi2dc->csi2dc_sd.dev = dev;
 685         snprintf(csi2dc->csi2dc_sd.name, sizeof(csi2dc->csi2dc_sd.name),
 686                  "csi2dc");
 687
 688         csi2dc->csi2dc_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 689         csi2dc->csi2dc_sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
 690         csi2dc->csi2dc_sd.entity.ops = &csi2dc_entity_ops;
 691
 692         platform_set_drvdata(pdev, csi2dc);
 693
 694         ret = csi2dc_of_parse(csi2dc, dev->of_node);
 695         if (ret)
 696                 goto csi2dc_probe_cleanup_entity;
 697
 698         csi2dc->pads[CSI2DC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 699         if (csi2dc->video_pipe)
 700                 csi2dc->pads[CSI2DC_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 701
 702         ret = media_entity_pads_init(&csi2dc->csi2dc_sd.entity,
 703                                      csi2dc->video_pipe ? CSI2DC_PADS_NUM : 1,
 704                                      csi2dc->pads);
 705         if (ret < 0) {
 706                 dev_err(dev, "media entity init failed\n");
 707                 goto csi2dc_probe_cleanup_notifier;
 708         }
 709
 710         csi2dc_default_format(csi2dc);
 711
 712         /* turn power on to validate capabilities */
 713         ret = csi2dc_power(csi2dc, true);
 714         if (ret < 0)
 715                 goto csi2dc_probe_cleanup_notifier;
 716
 717         pm_runtime_set_active(dev);
 718         pm_runtime_enable(dev);
 719         ver = csi2dc_readl(csi2dc, CSI2DC_VERSION);
 720
 721         /*
 722          * we must register the subdev after PM runtime has been requested,
 723          * otherwise we might bound immediately and request pm_runtime_resume
 724          * before runtime_enable.
 725          */
 726         ret = v4l2_async_register_subdev(&csi2dc->csi2dc_sd);
 727         if (ret) {
 728                 dev_err(csi2dc->dev, "failed to register the subdevice\n");
 729                 goto csi2dc_probe_cleanup_notifier;
 730         }
 731
 732         dev_info(dev, "Microchip CSI2DC version %x\n", ver);
 733
 734         return 0;
 735
 736 csi2dc_probe_cleanup_notifier:
 737         v4l2_async_nf_cleanup(&csi2dc->notifier);
 738 csi2dc_probe_cleanup_entity:
 739         media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
 740
 741         return ret;
 742 }
 743
 744 static int csi2dc_remove(struct platform_device *pdev)
 745 {
 746         struct csi2dc_device *csi2dc = platform_get_drvdata(pdev);
 747
 748         pm_runtime_disable(&pdev->dev);
 749
 750         v4l2_async_unregister_subdev(&csi2dc->csi2dc_sd);
 751         v4l2_async_nf_unregister(&csi2dc->notifier);
 752         v4l2_async_nf_cleanup(&csi2dc->notifier);
 753         media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
 754
 755         return 0;
 756 }
 757
 758 static int __maybe_unused csi2dc_runtime_suspend(struct device *dev)
 759 {
 760         struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
 761
 762         return csi2dc_power(csi2dc, false);
 763 }
 764
 765 static int __maybe_unused csi2dc_runtime_resume(struct device *dev)
 766 {
 767         struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
 768
 769         return csi2dc_power(csi2dc, true);
 770 }
 771
 772 static const struct dev_pm_ops csi2dc_dev_pm_ops = {
 773         SET_RUNTIME_PM_OPS(csi2dc_runtime_suspend, csi2dc_runtime_resume, NULL)
 774 };
 775
 776 static const struct of_device_id csi2dc_of_match[] = {
 777         { .compatible = "microchip,sama7g5-csi2dc" },
 778         { }
 779 };
 780
 781 MODULE_DEVICE_TABLE(of, csi2dc_of_match);
 782
 783 static struct platform_driver csi2dc_driver = {
 784         .probe  = csi2dc_probe,
 785         .remove = csi2dc_remove,
 786         .driver = {
 787                 .name =                 "microchip-csi2dc",
 788                 .pm =                   &csi2dc_dev_pm_ops,
 789                 .of_match_table =       of_match_ptr(csi2dc_of_match),
 790         },
 791 };
 792
 793 module_platform_driver(csi2dc_driver);
 794
 795 MODULE_AUTHOR("Eugen Hristev <eugen.hristev@microchip.com>");
 796 MODULE_DESCRIPTION("Microchip CSI2 Demux Controller driver");
 797 MODULE_LICENSE("GPL v2");