Re: [PATCH v3 2/3] media: atmel: introduce microchip csi2dc driver

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On 31.08.2020 11:50, Sakari Ailus wrote:

> Hi Eugen,
> 
> Thanks for the update.

Hi Sakari,

Thanks for reviewing, but, could you please help me understand your 
review below ?

> 
> On Wed, Aug 26, 2020 at 09:51:41AM +0300, Eugen Hristev wrote:
>> Microchip CSI2DC (CSI2 Demultiplexer Controller) is a misc bridge device
>> that converts a byte stream in IDI Synopsys format (coming from a CSI2HOST)
>> to a pixel stream that can be captured by a sensor controller.
>>
>> Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
>> ---
>> Changes in v2:
>> - moved driver to platform/atmel
>> - fixed minor things as per Sakari's review
>> - still some things from v2 review are not yet addressed, to be followed up
>>
>>   drivers/media/platform/atmel/Kconfig          |  13 +
>>   drivers/media/platform/atmel/Makefile         |   1 +
>>   .../media/platform/atmel/microchip-csi2dc.c   | 700 ++++++++++++++++++
>>   3 files changed, 714 insertions(+)
>>   create mode 100644 drivers/media/platform/atmel/microchip-csi2dc.c
>>
>> diff --git a/drivers/media/platform/atmel/Kconfig b/drivers/media/platform/atmel/Kconfig
>> index 1850fe7f9360..80bbddcc2504 100644
>> --- a/drivers/media/platform/atmel/Kconfig
>> +++ b/drivers/media/platform/atmel/Kconfig
>> @@ -21,3 +21,16 @@ config VIDEO_ATMEL_ISI
>>        help
>>          This module makes the ATMEL Image Sensor Interface available
>>          as a v4l2 device.
>> +
>> +config VIDEO_MICROCHIP_CSI2DC
>> +     tristate "Microchip CSI2 Demux Controller"
>> +     depends on VIDEO_V4L2 && COMMON_CLK && OF
>> +     depends on ARCH_AT91 || COMPILE_TEST
>> +     select MEDIA_CONTROLLER
>> +     select VIDEO_V4L2_SUBDEV_API
>> +     select V4L2_FWNODE
>> +     help
>> +       CSI2 Demux Controller driver. CSI2DC is a helper chip
>> +       that converts IDI interface byte stream to a parallel pixel stream.
>> +       It supports various RAW formats as input.
>> +       Performs clock domain crossing between hardware blocks.
>> diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile
>> index 2dba38994a70..8af7c5b534c3 100644
>> --- a/drivers/media/platform/atmel/Makefile
>> +++ b/drivers/media/platform/atmel/Makefile
>> @@ -3,3 +3,4 @@ atmel-isc-objs = atmel-sama5d2-isc.o atmel-isc-base.o
>>
>>   obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o
>>   obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
>> +obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += microchip-csi2dc.o
>> diff --git a/drivers/media/platform/atmel/microchip-csi2dc.c b/drivers/media/platform/atmel/microchip-csi2dc.c
>> new file mode 100644
>> index 000000000000..97d07a80bbf7
>> --- /dev/null
>> +++ b/drivers/media/platform/atmel/microchip-csi2dc.c
>> @@ -0,0 +1,700 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Microchip CSI2 Demux Controller (CSI2DC) driver
>> + *
>> + * Copyright (C) 2018-2020 Microchip Technology, Inc.
>> + *
>> + * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
>> + *
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_graph.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/videodev2.h>
>> +
>> +#include <media/v4l2-device.h>
>> +#include <media/v4l2-fwnode.h>
>> +#include <media/v4l2-subdev.h>
>> +#include <media/videobuf2-dma-contig.h>
>> +
>> +/* Global configuration register */
>> +#define CSI2DC_GCFG                  0x0
>> +
>> +/* MIPI sensor pixel clock is free running */
>> +#define CSI2DC_GCFG_MIPIFRN          BIT(0)
>> +/* Output waveform inter-line minimum delay */
>> +#define CSI2DC_GCFG_HLC(v)           ((v) << 4)
>> +#define CSI2DC_GCFG_HLC_MASK         GENMASK(7, 4)
>> +
>> +/* Global control register */
>> +#define CSI2DC_GCTLR                 0x04
>> +#define CSI2DC_GCTLR_SWRST           BIT(0)
>> +
>> +/* Global status register */
>> +#define CSI2DC_GS                    0x08
>> +
>> +/* SSP interrupt status register */
>> +#define CSI2DC_SSPIS                 0x28
>> +/* Pipe update register */
>> +#define CSI2DC_PU                    0xC0
>> +/* Video pipe attributes update */
>> +#define CSI2DC_PU_VP                 BIT(0)
>> +
>> +/* Pipe update status register */
>> +#define CSI2DC_PUS                   0xC4
>> +
>> +/* Video pipeline enable register */
>> +#define CSI2DC_VPE                   0xF8
>> +#define CSI2DC_VPE_ENABLE            BIT(0)
>> +
>> +/* Video pipeline configuration register */
>> +#define CSI2DC_VPCFG                 0xFC
>> +/* Data type */
>> +#define CSI2DC_VPCFG_DT(v)           ((v) << 0)
>> +#define CSI2DC_VPCFG_DT_MASK         GENMASK(5, 0)
>> +/* Virtual channel identifier */
>> +#define CSI2DC_VPCFG_VC(v)           ((v) << 6)
>> +#define CSI2DC_VPCFG_VC_MASK         GENMASK(7, 6)
>> +/* Decompression enable */
>> +#define CSI2DC_VPCFG_DE                      BIT(8)
>> +/* Decoder mode */
>> +#define CSI2DC_VPCFG_DM(v)           ((v) << 9)
>> +#define CSI2DC_VPCFG_DM_DECODER8TO12 0
>> +/* Decoder predictor 2 selection */
>> +#define CSI2DC_VPCFG_DP2             BIT(12)
>> +/* Recommended memory storage */
>> +#define CSI2DC_VPCFG_RMS             BIT(13)
>> +/* Post adjustment */
>> +#define CSI2DC_VPCFG_PA                      BIT(14)
>> +
>> +/* Video pipeline column register */
>> +#define CSI2DC_VPCOL                 0x100
>> +/* Column number */
>> +#define CSI2DC_VPCOL_COL(v)          ((v) << 0)
>> +#define CSI2DC_VPCOL_COL_MASK                GENMASK(15, 0)
>> +
>> +/* Video pipeline row register */
>> +#define CSI2DC_VPROW                 0x104
>> +/* Row number */
>> +#define CSI2DC_VPROW_ROW(v)          ((v) << 0)
>> +#define CSI2DC_VPROW_ROW_MASK                GENMASK(15, 0)
>> +
>> +/* Version register */
>> +#define CSI2DC_VERSION                       0x1FC
>> +
>> +/* register read/write helpers */
>> +#define csi2dc_readl(st, reg)                readl_relaxed((st)->base + (reg))
>> +#define csi2dc_writel(st, reg, val)  writel_relaxed((val), (st)->base + (reg))
>> +
>> +/* supported RAW data types */
>> +#define CSI2DC_DT_RAW6                       0x28
>> +#define CSI2DC_DT_RAW7                       0x29
>> +#define CSI2DC_DT_RAW8                       0x2A
>> +#define CSI2DC_DT_RAW10                      0x2B
>> +#define CSI2DC_DT_RAW12                      0x2C
>> +#define CSI2DC_DT_RAW14                      0x2D
>> +
>> +struct csi2dc_format {
>> +     u32                             mbus_code;
>> +     u32                             dt;
>> +};
>> +
>> +static struct csi2dc_format csi2dc_formats_list[] = {
> 
> const

Elements from this array are being selected in a dynamic list, and 
pointed from a non-const array of selected working formats (at subdevice 
completion time). If I make this const , I will get compiler warnings 
when assigning to the non-const array.
What solution do you suggest for this ?


> 
>> +     {
>> +             .mbus_code =            MEDIA_BUS_FMT_SRGGB10_1X10,
>> +             .dt =                   CSI2DC_DT_RAW10,
>> +     },
>> +};
>> +
>> +enum mipi_csi_pads {
>> +     CSI2DC_PAD_SINK                 = 0,
>> +     CSI2DC_PAD_SOURCE               = 1,
>> +     CSI2DC_PADS_NUM                 = 2,
>> +};
>> +
>> +struct csi2dc_device {
>> +     void __iomem                    *base;
>> +     struct v4l2_subdev              csi2dc_sd;
>> +     struct device                   *dev;
>> +     struct v4l2_device              v4l2_dev;
> 
> This device is a bridge; the V4L2 device should be registered by the master
> driver, i.e. the one handling DMA and registering the video nodes. Please
> drop this.
> 
>> +     struct clk                      *pclk;
>> +     struct clk                      *scck;
>> +
>> +     bool                            video_pipe;
>> +
>> +     u32                             num_fmts;
>> +     struct csi2dc_format            **formats;
>> +
>> +     struct csi2dc_format            *cur_fmt;
>> +     struct csi2dc_format            *try_fmt;
>> +
>> +     struct media_pad                pads[CSI2DC_PADS_NUM];
>> +
>> +     bool                            clk_gated;
>> +     u32                             inter_line_delay;
>> +     u32                             vc;
>> +
>> +     struct v4l2_async_subdev        *asd;
>> +     struct v4l2_async_notifier      notifier;
>> +
>> +     struct v4l2_subdev              *input_sd;
>> +     bool                            completed;
>> +};
>> +
>> +static void csi2dc_vp_update(struct csi2dc_device *csi2dc)
>> +{
>> +     u32 vp;
>> +
>> +     vp = CSI2DC_VPCFG_DT(csi2dc->cur_fmt->dt) & CSI2DC_VPCFG_DT_MASK;
>> +     vp |= CSI2DC_VPCFG_VC(csi2dc->vc) & CSI2DC_VPCFG_VC_MASK;
>> +     vp &= ~CSI2DC_VPCFG_DE;
>> +     vp |= CSI2DC_VPCFG_DM(CSI2DC_VPCFG_DM_DECODER8TO12);
>> +     vp &= ~CSI2DC_VPCFG_DP2;
>> +     vp &= ~CSI2DC_VPCFG_RMS;
>> +     vp |= CSI2DC_VPCFG_PA;
>> +
>> +     csi2dc_writel(csi2dc, CSI2DC_VPCFG, vp);
>> +     csi2dc_writel(csi2dc, CSI2DC_VPE, CSI2DC_VPE_ENABLE);
>> +     csi2dc_writel(csi2dc, CSI2DC_PU, CSI2DC_PU_VP);
>> +}
>> +
>> +static inline struct csi2dc_device *
>> +csi2dc_sd_to_csi2dc_device(struct v4l2_subdev *csi2dc_sd)
>> +{
>> +     return container_of(csi2dc_sd, struct csi2dc_device, csi2dc_sd);
>> +}
>> +
>> +static int csi2dc_enum_mbus_code(struct v4l2_subdev *csi2dc_sd,
>> +                              struct v4l2_subdev_pad_config *cfg,
>> +                              struct v4l2_subdev_mbus_code_enum *code)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +
>> +     if (code->index >= csi2dc->num_fmts)
>> +             return -EINVAL;
>> +
>> +     code->code = csi2dc->formats[code->index]->mbus_code;
>> +     return 0;
>> +}
>> +
>> +static int csi2dc_try_fmt(struct v4l2_subdev *csi2dc_sd,
>> +                       struct v4l2_subdev_pad_config *cfg,
>> +                       struct v4l2_subdev_format *req_fmt)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +     struct csi2dc_format *fmt;
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     for (fmt = csi2dc->formats[0]; fmt; fmt++)
>> +             if (req_fmt->format.code == fmt->mbus_code)
>> +                     csi2dc->try_fmt = fmt;
>> +
>> +     /* in case we could not find the desired format, default to something */
>> +     if (!csi2dc->try_fmt  ||
>> +         req_fmt->format.code != csi2dc->try_fmt->mbus_code) {
>> +             csi2dc->try_fmt = csi2dc->formats[0];
>> +             req_fmt->format.code = csi2dc->formats[0]->mbus_code;
>> +     }
>> +
>> +     return v4l2_subdev_call(csi2dc->input_sd, pad, set_fmt, cfg, req_fmt);
>> +}
>> +
>> +static int csi2dc_set_fmt(struct v4l2_subdev *csi2dc_sd,
>> +                       struct v4l2_subdev_pad_config *cfg,
>> +                       struct v4l2_subdev_format *req_fmt)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +     int ret;
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     csi2dc_try_fmt(csi2dc_sd, cfg, req_fmt);
>> +
>> +     if (csi2dc->try_fmt->mbus_code != req_fmt->format.code) {
>> +             dev_dbg(csi2dc->dev, "CSI2DC unsupported format 0x%x\n",
>> +                     req_fmt->format.code);
> 
> Please adjust the format into a supported one instead.

I thought that only the 'try_fmt' calls should adapt to something that 
works. It is the same case for set_fmt ? This function cannot return 
invalid format ?
> 
>> +             return -EINVAL;
>> +     }
>> +
>> +     ret = v4l2_subdev_call(csi2dc->input_sd, pad, set_fmt, cfg, req_fmt);
>> +     if (ret) {
>> +             dev_err(csi2dc->dev, "input subdev failed %d\n", ret);
>> +             return ret;
>> +     }
>> +
>> +     csi2dc->cur_fmt = csi2dc->try_fmt;
>> +     /* update video pipe */
>> +     csi2dc_vp_update(csi2dc);
>> +
>> +     dev_dbg(csi2dc->dev, "CSI2DC new format: 0x%x\n", req_fmt->format.code);
>> +     return 0;
>> +}
>> +
>> +static int csi2dc_formats_init(struct csi2dc_device *csi2dc)
>> +{
>> +     int i, j;
>> +     struct csi2dc_format *fmt = &csi2dc_formats_list[0];
>> +
>> +     csi2dc->num_fmts = 1;
>> +
>> +     csi2dc->formats = devm_kcalloc(csi2dc->dev, csi2dc->num_fmts,
>> +                                    sizeof(*csi2dc->formats), GFP_KERNEL);
>> +
>> +     for (i = 0, j = 0; i < ARRAY_SIZE(csi2dc_formats_list); i++, fmt++)
>> +             if (fmt->mbus_code == MEDIA_BUS_FMT_SRGGB10_1X10)
>> +                     csi2dc->formats[j++] = fmt;
>> +     return 0;
>> +}
>> +
>> +static int csi2dc_s_power(struct v4l2_subdev *csi2dc_sd, int on)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +     int ret = 0;
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     if (on)
>> +             ret = clk_prepare_enable(csi2dc->scck);
>> +     else
>> +             clk_disable_unprepare(csi2dc->scck);
>> +     if (ret)
>> +             dev_err(csi2dc->dev, "failed to enable scck: %d\n", ret);
>> +
>> +     /* if powering up, deassert reset line */
>> +     if (on)
>> +             csi2dc_writel(csi2dc, CSI2DC_GCTLR, CSI2DC_GCTLR_SWRST);
>> +
>> +     ret = v4l2_subdev_call(csi2dc->input_sd, core, s_power, on);
>> +
>> +     /* if powering down, assert reset line */
>> +     if (!on)
>> +             csi2dc_writel(csi2dc, CSI2DC_GCTLR, !CSI2DC_GCTLR_SWRST);
> 
> These go to the runtime resume and suspend callbacks.

Okay I will update

> 
>> +
>> +     return ret;
>> +}
>> +
>> +static int csi2dc_s_stream(struct v4l2_subdev *csi2dc_sd, int enable)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     return v4l2_subdev_call(csi2dc->input_sd, video, s_stream, enable);
>> +}
>> +
>> +static int csi2dc_g_frame_interval(struct v4l2_subdev *csi2dc_sd,
>> +                                struct v4l2_subdev_frame_interval *interval)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     return v4l2_subdev_call(csi2dc->input_sd, video, g_frame_interval,
>> +                             interval);
>> +}
>> +
>> +static int csi2dc_s_frame_interval(struct v4l2_subdev *csi2dc_sd,
>> +                                struct v4l2_subdev_frame_interval *interval)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     return v4l2_subdev_call(csi2dc->input_sd, video, s_frame_interval,
>> +                             interval);
> 
> If your driver is used with a MC-enabled master driver, you can drop all
> the v4l2_subdev_call() macros apart from the ones related to s_stream
> operation.

And the set frame interval for example, will it be sent to the sensor 
automatically ?
I noticed that such operations on the master driver were not propagated 
to the underlying subdevice. How does the master device 'know' how to 
call the input_sd ? this input_sd is not referenced anywhere in the 
master driver.

> 
> If not, then you can drop the HAS_DEVNODE flag from the subdev flags. But
> I'd try to avoid this route if possible.
> 
>> +}
>> +
>> +static int csi2dc_enum_frame_size(struct v4l2_subdev *csi2dc_sd,
>> +                               struct v4l2_subdev_pad_config *cfg,
>> +                               struct v4l2_subdev_frame_size_enum *fse)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     return v4l2_subdev_call(csi2dc->input_sd, pad, enum_frame_size, cfg,
>> +                             fse);
>> +}
>> +
>> +static int csi2dc_enum_frame_interval(struct v4l2_subdev *csi2dc_sd,
>> +                                   struct v4l2_subdev_pad_config *cfg,
>> +                                   struct v4l2_subdev_frame_interval_enum *fie)
>> +{
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +
>> +     if (!csi2dc->completed) {
>> +             dev_dbg((csi2dc)->dev, "subdev not registered yet\n");
>> +             return 0;
>> +     }
>> +
>> +     return v4l2_subdev_call(csi2dc->input_sd, pad, enum_frame_interval, cfg,
>> +                             fie);
>> +}
>> +
>> +static const struct v4l2_subdev_core_ops csi2dc_core_ops = {
>> +     .s_power = csi2dc_s_power,
> 
> Please use runtime PM instead.
> 
>> +};
>> +
>> +static const struct v4l2_subdev_pad_ops csi2dc_pad_ops = {
>> +     .enum_mbus_code = csi2dc_enum_mbus_code,
>> +     .set_fmt = csi2dc_set_fmt,
>> +     .enum_frame_size = csi2dc_enum_frame_size,
>> +     .enum_frame_interval = csi2dc_enum_frame_interval,
>> +};
>> +
>> +static const struct v4l2_subdev_video_ops csi2dc_video_ops = {
>> +     .s_stream = csi2dc_s_stream,
>> +     .g_frame_interval = csi2dc_g_frame_interval,
>> +     .s_frame_interval = csi2dc_s_frame_interval,
>> +};
>> +
>> +static const struct v4l2_subdev_ops csi2dc_subdev_ops = {
>> +     .core = &csi2dc_core_ops,
>> +     .pad = &csi2dc_pad_ops,
>> +     .video = &csi2dc_video_ops,
>> +};
>> +
>> +static int csi2dc_async_bound(struct v4l2_async_notifier *notifier,
>> +                           struct v4l2_subdev *subdev,
>> +                           struct v4l2_async_subdev *asd)
>> +{
>> +     struct csi2dc_device *csi2dc = container_of(notifier->v4l2_dev,
>> +                                     struct csi2dc_device, v4l2_dev);
>> +     csi2dc->input_sd = subdev;
>> +
>> +     return 0;
>> +}
>> +
>> +static int csi2dc_async_complete(struct v4l2_async_notifier *notifier)
>> +{
>> +     struct csi2dc_device *csi2dc =
>> +             container_of(notifier->v4l2_dev, struct csi2dc_device, v4l2_dev);
> 
> Over 80 characters per line. Please check the rest of the driver, too.
> 
>> +     int ret;
>> +
>> +     ret = v4l2_device_register_subdev_nodes(&csi2dc->v4l2_dev);
>> +     if (ret < 0) {
>> +             v4l2_err(&csi2dc->v4l2_dev, "failed to register subdev nodes\n");
>> +             return ret;
>> +     }
>> +
>> +     csi2dc_writel(csi2dc, CSI2DC_GCFG,
>> +                   (CSI2DC_GCFG_HLC(csi2dc->inter_line_delay) &
>> +                   CSI2DC_GCFG_HLC_MASK) |
>> +                   (csi2dc->clk_gated ? 0 : CSI2DC_GCFG_MIPIFRN));
>> +
>> +     csi2dc_writel(csi2dc, CSI2DC_VPCOL,
>> +                   CSI2DC_VPCOL_COL(0xFFF) & CSI2DC_VPCOL_COL_MASK);
>> +     csi2dc_writel(csi2dc, CSI2DC_VPROW,
>> +                   CSI2DC_VPROW_ROW(0xFFF) & CSI2DC_VPROW_ROW_MASK);
>> +
>> +     csi2dc->completed = true;
>> +
>> +     return ret;
>> +}
>> +
>> +static const struct v4l2_async_notifier_operations csi2dc_async_ops = {
>> +     .bound = csi2dc_async_bound,
>> +     .complete = csi2dc_async_complete,
>> +};
>> +
>> +static void csi2dc_cleanup_notifier(struct csi2dc_device *csi2dc)
>> +{
>> +     v4l2_async_notifier_unregister(&csi2dc->notifier);
>> +     v4l2_async_notifier_cleanup(&csi2dc->notifier);
>> +}
>> +
>> +static int csi2dc_prepare_notifier(struct csi2dc_device *csi2dc,
>> +                                struct device_node *input_parent)
>> +{
>> +     int ret;
>> +
>> +     v4l2_async_notifier_init(&csi2dc->notifier);
>> +
>> +     csi2dc->asd = kzalloc(sizeof(*csi2dc->asd), GFP_KERNEL);
>> +     if (!csi2dc->asd)
>> +             return -ENOMEM;
>> +
>> +     csi2dc->asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
>> +     csi2dc->asd->match.fwnode = of_fwnode_handle(input_parent);
>> +
>> +     ret = v4l2_async_notifier_add_subdev(&csi2dc->notifier, csi2dc->asd);
>> +     if (ret) {
>> +             dev_err(csi2dc->dev, "failed to add async notifier.\n");
>> +             v4l2_async_notifier_cleanup(&csi2dc->notifier);
>> +             goto csi2dc_prepare_notifier_err;
>> +     }
>> +
>> +     csi2dc->notifier.ops = &csi2dc_async_ops;
>> +
>> +     ret = v4l2_async_notifier_register(&csi2dc->v4l2_dev,
>> +                                        &csi2dc->notifier);
>> +
>> +     if (ret) {
>> +             dev_err(csi2dc->dev, "fail to register async notifier.\n");
>> +             goto csi2dc_prepare_notifier_err;
>> +     }
>> +
>> +csi2dc_prepare_notifier_err:
>> +     of_node_put(input_parent);
>> +
>> +     return ret;
>> +}
>> +
>> +static int csi2dc_of_parse(struct csi2dc_device *csi2dc,
>> +                        struct device_node *of_node)
>> +{
>> +     struct device_node *input_node, *sink_node, *input_parent;
>> +     struct v4l2_fwnode_endpoint input_endpoint = { 0 }, sink_endpoint = { 0 };
>> +     int ret;
>> +
>> +     input_node = of_graph_get_next_endpoint(of_node, NULL);
>> +
>> +     if (!input_node) {
>> +             dev_err(csi2dc->dev, "missing port node at %s, input node is mandatory.\n",
>> +                     of_node->full_name);
>> +             return -EINVAL;
>> +     }
>> +
>> +     ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(input_node),
>> +                                      &input_endpoint);
>> +
>> +     if (ret) {
>> +             dev_err(csi2dc->dev, "endpoint not defined at %s\n",
>> +                     of_node->full_name);
>> +             return ret;
>> +     }
>> +
>> +     input_parent = of_graph_get_remote_port_parent(input_node);
>> +     if (!input_parent) {
>> +             dev_err(csi2dc->dev, "could not get input node's parent node.\n");
>> +             return -EINVAL;
>> +     }
>> +
>> +     sink_node = of_graph_get_next_endpoint(of_node, input_node);
>> +
>> +     if (sink_node)
>> +             ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(sink_node),
>> +                                              &sink_endpoint);
>> +
>> +     if (!sink_node || ret) {
>> +             dev_info(csi2dc->dev, "missing sink node at %s, data pipe available only.\n",
>> +                      of_node->full_name);
>> +     } else {
>> +             csi2dc->video_pipe = true;
>> +             csi2dc->vc = sink_endpoint.base.id;
>> +
>> +             dev_dbg(csi2dc->dev, "block %s %d.%d->%d.%d video pipe VC %d\n",
>> +                     of_node->full_name, input_endpoint.base.port,
>> +                     input_endpoint.base.id, sink_endpoint.base.port,
>> +                     sink_endpoint.base.id, csi2dc->vc);
>> +     }
>> +
>> +     csi2dc->clk_gated = of_property_read_bool(of_node,
>> +                                               "microchip,clk-gated");
>> +
>> +     dev_dbg(csi2dc->dev, "%s clock\n",
>> +             csi2dc->clk_gated ? "Gated" : "Free running");
>> +
>> +     ret = of_property_read_u32(of_node, "microchip,inter-line-delay",
>> +                                &csi2dc->inter_line_delay);
>> +
>> +     if (ret || csi2dc->inter_line_delay > 16 ||
>> +         csi2dc->inter_line_delay == 0) {
>> +             dev_dbg(csi2dc->dev, "assuming inter line delay = 16 clocks");
>> +             csi2dc->inter_line_delay = 16;
>> +             ret = 0;
>> +     }
>> +     /* hardware automatically adds 1 */
>> +     csi2dc->inter_line_delay--;
>> +
>> +     /* prepare async notifier for subdevice completion */
>> +
>> +     of_node_put(sink_node);
>> +     of_node_put(input_node);
>> +
>> +     return csi2dc_prepare_notifier(csi2dc, input_parent);
>> +}
>> +
>> +static int csi2dc_probe(struct platform_device *pdev)
>> +{
>> +     struct device *dev = &pdev->dev;
>> +     struct csi2dc_device *csi2dc;
>> +     struct resource *res = NULL;
>> +     int ret = 0;
>> +
>> +     csi2dc = devm_kzalloc(dev, sizeof(*csi2dc), GFP_KERNEL);
>> +     if (!csi2dc)
>> +             return -ENOMEM;
>> +
>> +     csi2dc->dev = dev;
>> +
>> +     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +     if (!res)
>> +             return -EINVAL;
>> +
>> +     csi2dc->base = devm_ioremap_resource(dev, res);
>> +
>> +     if (IS_ERR(csi2dc->base)) {
>> +             dev_err(dev, "base address not set\n");
>> +             return PTR_ERR(csi2dc->base);
>> +     }
>> +
>> +     csi2dc->pclk = devm_clk_get(dev, "pclk");
>> +     if (IS_ERR(csi2dc->pclk)) {
>> +             ret = PTR_ERR(csi2dc->pclk);
>> +             dev_err(dev, "failed to get pclk: %d\n", ret);
>> +             return ret;
>> +     }
>> +
>> +     ret = clk_prepare_enable(csi2dc->pclk);
>> +     if (ret) {
>> +             dev_err(dev, "failed to enable pclk: %d\n", ret);
>> +             return ret;
>> +     }
>> +
>> +     csi2dc->scck = devm_clk_get(dev, "scck");
>> +     if (IS_ERR(csi2dc->scck)) {
>> +             ret = PTR_ERR(csi2dc->scck);
>> +             dev_err(dev, "failed to get scck: %d\n", ret);
>> +             goto csi2dc_clk_fail;
>> +     }
>> +
>> +     ret = v4l2_device_register(dev, &csi2dc->v4l2_dev);
>> +     if (ret) {
>> +             dev_err(dev, "unable to register v4l2 device.\n");
>> +             goto csi2dc_clk_fail;
>> +     }
>> +
>> +     v4l2_subdev_init(&csi2dc->csi2dc_sd, &csi2dc_subdev_ops);
>> +
>> +     csi2dc->csi2dc_sd.owner = THIS_MODULE;
>> +     csi2dc->csi2dc_sd.dev = dev;
>> +     snprintf(csi2dc->csi2dc_sd.name, sizeof(csi2dc->csi2dc_sd.name),
>> +              "CSI2DC.0");
>> +
>> +     csi2dc->csi2dc_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>> +     csi2dc->csi2dc_sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
>> +     csi2dc->pads[CSI2DC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
>> +     csi2dc->pads[CSI2DC_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
>> +
>> +     ret = media_entity_pads_init(&csi2dc->csi2dc_sd.entity, CSI2DC_PADS_NUM,
>> +                                  csi2dc->pads);
>> +     if (ret < 0) {
>> +             dev_err(dev, "media entity init failed\n");
>> +             goto csi2dc_probe_entity_err;
>> +     }
>> +
>> +     v4l2_set_subdevdata(&csi2dc->csi2dc_sd, pdev);
>> +
>> +     platform_set_drvdata(pdev, &csi2dc->csi2dc_sd);
>> +
>> +     ret = csi2dc_of_parse(csi2dc, dev->of_node);
>> +     if (ret)
>> +             goto csi2dc_probe_entity_err;
>> +
>> +     ret = csi2dc_formats_init(csi2dc);
>> +     if (ret)
>> +             goto csi2dc_probe_error;
>> +
>> +     ret = v4l2_async_register_subdev(&csi2dc->csi2dc_sd);
>> +     if (ret)
>> +             goto csi2dc_probe_error;
>> +
>> +     pr_info("Microchip CSI2DC version %x\n",
>> +             csi2dc_readl(csi2dc, CSI2DC_VERSION));
> 
> dev_info(), please. Or just dev_dbg().
> 
>> +
>> +     pm_runtime_set_active(dev);
>> +     pm_runtime_enable(dev);
>> +     pm_request_idle(dev);
>> +
>> +     return 0;
>> +
>> +csi2dc_probe_error:
>> +     v4l2_async_unregister_subdev(&csi2dc->csi2dc_sd);
>> +     csi2dc_cleanup_notifier(csi2dc);
>> +
>> +csi2dc_probe_entity_err:
>> +     media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
>> +     v4l2_device_unregister(&csi2dc->v4l2_dev);
>> +csi2dc_clk_fail:
>> +     clk_disable_unprepare(csi2dc->pclk);
>> +     return ret;
>> +}
>> +
>> +static int csi2dc_remove(struct platform_device *pdev)
>> +{
>> +     struct v4l2_subdev *csi2dc_sd = platform_get_drvdata(pdev);
>> +     struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
>> +
>> +     pm_runtime_disable(&pdev->dev);
>> +     csi2dc_cleanup_notifier(csi2dc);
>> +     media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
>> +     v4l2_device_unregister(&csi2dc->v4l2_dev);
>> +     clk_disable_unprepare(csi2dc->pclk);
>> +
>> +     return 0;
>> +}
>> +
>> +static int __maybe_unused csi2dc_runtime_suspend(struct device *dev)
>> +{
>> +     return 0;
>> +}
>> +
>> +static int __maybe_unused csi2dc_runtime_resume(struct device *dev)
>> +{
>> +     return 0;
>> +}
>> +
>> +static const struct dev_pm_ops csi2dc_dev_pm_ops = {
>> +     SET_RUNTIME_PM_OPS(csi2dc_runtime_suspend, csi2dc_runtime_resume, NULL)
>> +};
>> +
>> +static const struct of_device_id csi2dc_of_match[] = {
>> +     { .compatible = "microchip,sama7g5-csi2dc" },
>> +     { }
>> +};
>> +
>> +MODULE_DEVICE_TABLE(of, csi2dc_of_match);
>> +
>> +static struct platform_driver csi2dc_driver = {
>> +     .probe  = csi2dc_probe,
>> +     .remove = csi2dc_remove,
>> +     .driver = {
>> +             .name           = "microchip-csi2dc",
>> +             .pm             = &csi2dc_dev_pm_ops,
>> +             .of_match_table = of_match_ptr(csi2dc_of_match),
>> +     },
>> +};
>> +
>> +module_platform_driver(csi2dc_driver);
>> +
>> +MODULE_AUTHOR("Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>");
>> +MODULE_DESCRIPTION("Microchip CSI2 Demux Controller driver");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_SUPPORTED_DEVICE("video");
> 
> Hmm. This line needs to be more specific. I'd just drop it.
> 
> --
> Kind regards,
> 
> Sakari Ailus
> 





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