[PATCH v2 10/19] media: Add i.MX media core driver
Vladimir Zapolskiy
vladimir_zapolskiy at mentor.com
Wed Jan 4 13:33:26 UTC 2017
Hi Steve,
On 01/03/2017 10:57 PM, Steve Longerbeam wrote:
> Add the core media driver for i.MX SOC.
>
> Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
> ---
> Documentation/devicetree/bindings/media/imx.txt | 205 +++++
v2 was sent before getting Rob's review comments, but still they
should be addressed in v3.
Also I would suggest to separate device tree binding documentation
change and place it as the first patch in the series, this should
make the following DTS changes valid.
> Documentation/media/v4l-drivers/imx.rst | 430 ++++++++++
> drivers/staging/media/Kconfig | 2 +
> drivers/staging/media/Makefile | 1 +
> drivers/staging/media/imx/Kconfig | 8 +
> drivers/staging/media/imx/Makefile | 6 +
> drivers/staging/media/imx/TODO | 18 +
> drivers/staging/media/imx/imx-media-common.c | 985 ++++++++++++++++++++++
> drivers/staging/media/imx/imx-media-dev.c | 479 +++++++++++
> drivers/staging/media/imx/imx-media-fim.c | 509 +++++++++++
> drivers/staging/media/imx/imx-media-internal-sd.c | 457 ++++++++++
> drivers/staging/media/imx/imx-media-of.c | 291 +++++++
> drivers/staging/media/imx/imx-media-of.h | 25 +
> drivers/staging/media/imx/imx-media.h | 299 +++++++
> include/media/imx.h | 15 +
> include/uapi/Kbuild | 1 +
> include/uapi/linux/v4l2-controls.h | 4 +
> include/uapi/media/Kbuild | 2 +
> include/uapi/media/imx.h | 30 +
Probably Greg should ack the UAPI changes, you may consider
to split them into a separate patch.
> 19 files changed, 3767 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/imx.txt
> create mode 100644 Documentation/media/v4l-drivers/imx.rst
> create mode 100644 drivers/staging/media/imx/Kconfig
> create mode 100644 drivers/staging/media/imx/Makefile
> create mode 100644 drivers/staging/media/imx/TODO
> create mode 100644 drivers/staging/media/imx/imx-media-common.c
> create mode 100644 drivers/staging/media/imx/imx-media-dev.c
> create mode 100644 drivers/staging/media/imx/imx-media-fim.c
> create mode 100644 drivers/staging/media/imx/imx-media-internal-sd.c
> create mode 100644 drivers/staging/media/imx/imx-media-of.c
> create mode 100644 drivers/staging/media/imx/imx-media-of.h
> create mode 100644 drivers/staging/media/imx/imx-media.h
> create mode 100644 include/media/imx.h
> create mode 100644 include/uapi/media/Kbuild
> create mode 100644 include/uapi/media/imx.h
>
[snip]
> +
> +struct imx_media_subdev *
> +imx_media_find_subdev_by_sd(struct imx_media_dev *imxmd,
> + struct v4l2_subdev *sd)
> +{
> + struct imx_media_subdev *imxsd;
> + int i, ret = -ENODEV;
> +
> + for (i = 0; i < imxmd->num_subdevs; i++) {
> + imxsd = &imxmd->subdev[i];
> + if (sd == imxsd->sd) {
This can be simplifed:
...
if (sd == imxsd->sd)
return imxsd;
}
return ERR_PTR(-ENODEV);
> + ret = 0;
> + break;
> + }
> + }
> +
> + return ret ? ERR_PTR(ret) : imxsd;
> +}
> +EXPORT_SYMBOL_GPL(imx_media_find_subdev_by_sd);
> +
> +struct imx_media_subdev *
> +imx_media_find_subdev_by_id(struct imx_media_dev *imxmd, u32 grp_id)
> +{
> + struct imx_media_subdev *imxsd;
> + int i, ret = -ENODEV;
> +
> + for (i = 0; i < imxmd->num_subdevs; i++) {
> + imxsd = &imxmd->subdev[i];
> + if (imxsd->sd && imxsd->sd->grp_id == grp_id) {
> + ret = 0;
> + break;
This can be simplifed:
...
if (imxsd->sd && imxsd->sd->grp_id == grp_i)
return imxsd;
}
return ERR_PTR(-ENODEV);
> + }
> + }
> +
> + return ret ? ERR_PTR(ret) : imxsd;
> +}
> +EXPORT_SYMBOL_GPL(imx_media_find_subdev_by_id);
> +
[snip]
> diff --git a/drivers/staging/media/imx/imx-media-dev.c b/drivers/staging/media/imx/imx-media-dev.c
> new file mode 100644
> index 0000000..8d22730
> --- /dev/null
> +++ b/drivers/staging/media/imx/imx-media-dev.c
> @@ -0,0 +1,479 @@
> +/*
> + * V4L2 Media Controller Driver for Freescale i.MX5/6 SOC
> + *
> + * Copyright (c) 2016 Mentor Graphics Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/fs.h>
> +#include <linux/timer.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/platform_device.h>
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/of_platform.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-mc.h>
Please sort out the list of headers alphabetically.
> +#include <video/imx-ipu-v3.h>
> +#include <media/imx.h>
> +#include "imx-media.h"
> +#include "imx-media-of.h"
> +
> +#define DEVICE_NAME "imx-media"
I suppose you don't need this macro.
[snip]
> + */
> +static int imx_media_create_links(struct imx_media_dev *imxmd)
> +{
> + struct imx_media_subdev *local_sd;
> + struct imx_media_subdev *remote_sd;
> + struct v4l2_subdev *source, *sink;
> + struct imx_media_link *link;
> + struct imx_media_pad *pad;
> + u16 source_pad, sink_pad;
> + int num_pads, i, j, k;
> + int ret = 0;
> +
> + for (i = 0; i < imxmd->num_subdevs; i++) {
> + local_sd = &imxmd->subdev[i];
> + num_pads = local_sd->num_sink_pads + local_sd->num_src_pads;
> +
> + for (j = 0; j < num_pads; j++) {
> + pad = &local_sd->pad[j];
> +
> + for (k = 0; k < pad->num_links; k++) {
> + link = &pad->link[k];
> +
> + remote_sd = imx_media_find_async_subdev(
> + imxmd, link->remote_sd_node,
> + link->remote_devname);
> + if (!remote_sd) {
> + v4l2_warn(&imxmd->v4l2_dev,
> + "%s: no remote for %s:%d\n",
> + __func__, local_sd->sd->name,
> + link->local_pad);
> + continue;
> + }
> +
> + /* only create the source->sink links */
> + if (pad->pad.flags & MEDIA_PAD_FL_SINK)
> + continue;
> +
> + source = local_sd->sd;
> + sink = remote_sd->sd;
> + source_pad = link->local_pad;
> + sink_pad = link->remote_pad;
> +
> + v4l2_info(&imxmd->v4l2_dev,
> + "%s: %s:%d -> %s:%d\n", __func__,
> + source->name, source_pad,
> + sink->name, sink_pad);
> +
> + ret = media_create_pad_link(&source->entity,
> + source_pad,
> + &sink->entity,
> + sink_pad,
> + 0);
> + if (ret) {
> + v4l2_err(&imxmd->v4l2_dev,
> + "create_pad_link failed: %d\n",
> + ret);
> + goto out;
Indentation depth is quite terrific.
> + }
> + }
> + }
> + }
> +
> +out:
> + return ret;
>
[snip]
> +
> +static const struct of_device_id imx_media_dt_ids[] = {
> + { .compatible = "fsl,imx-media" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx_media_dt_ids);
> +
> +static struct platform_driver imx_media_pdrv = {
> + .probe = imx_media_probe,
> + .remove = imx_media_remove,
> + .driver = {
> + .name = DEVICE_NAME,
> + .owner = THIS_MODULE,
Setting of .owner is not needed nowadays IIRC.
> + .of_match_table = imx_media_dt_ids,
> + },
> +};
> +
> +module_platform_driver(imx_media_pdrv);
> +
> +MODULE_DESCRIPTION("i.MX5/6 v4l2 media controller driver");
> +MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam at mentor.com>");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/staging/media/imx/imx-media-fim.c b/drivers/staging/media/imx/imx-media-fim.c
> new file mode 100644
> index 0000000..52bfa8d
> --- /dev/null
> +++ b/drivers/staging/media/imx/imx-media-fim.c
> @@ -0,0 +1,509 @@
> +/*
> + * Frame Interval Monitor.
> + *
> + * Copyright (c) 2016 Mentor Graphics Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#ifdef CONFIG_IMX_GPT_ICAP
> +#include <linux/mxc_icap.h>
> +#endif
This looks clumsy. Include it unconditionally, if needed
do #ifdef's inside the header file.
> +#include <media/v4l2-subdev.h>
> +#include <media/v4l2-of.h>
> +#include <media/v4l2-ctrls.h>
Please sort out the list alphabetically.
> +#include <media/imx.h>
> +#include "imx-media.h"
> +
[snip]
> +
> +static int of_parse_fim(struct imx_media_fim *fim, struct device_node *np)
> +{
> + struct device_node *fim_np;
> + u32 val, tol[2], icap[2];
> + int ret;
> +
> + fim_np = of_get_child_by_name(np, "fim");
> + if (!fim_np) {
> + /* set to the default defaults */
> + fim->of_defaults[FIM_CL_ENABLE] = FIM_CL_ENABLE_DEF;
> + fim->of_defaults[FIM_CL_NUM] = FIM_CL_NUM_DEF;
> + fim->of_defaults[FIM_CL_NUM_SKIP] = FIM_CL_NUM_SKIP_DEF;
> + fim->of_defaults[FIM_CL_TOLERANCE_MIN] =
> + FIM_CL_TOLERANCE_MIN_DEF;
> + fim->of_defaults[FIM_CL_TOLERANCE_MAX] =
> + FIM_CL_TOLERANCE_MAX_DEF;
> + fim->icap_channel = -1;
> + return 0;
> + }
> +
> + ret = of_property_read_u32(fim_np, "enable", &val);
> + if (ret)
> + val = FIM_CL_ENABLE_DEF;
> + fim->of_defaults[FIM_CL_ENABLE] = val;
> +
> + ret = of_property_read_u32(fim_np, "num-avg", &val);
> + if (ret)
> + val = FIM_CL_NUM_DEF;
> + fim->of_defaults[FIM_CL_NUM] = val;
> +
> + ret = of_property_read_u32(fim_np, "num-skip", &val);
> + if (ret)
> + val = FIM_CL_NUM_SKIP_DEF;
> + fim->of_defaults[FIM_CL_NUM_SKIP] = val;
> +
> + ret = of_property_read_u32_array(fim_np, "tolerance-range", tol, 2);
> + if (ret) {
> + tol[0] = FIM_CL_TOLERANCE_MIN_DEF;
> + tol[1] = FIM_CL_TOLERANCE_MAX_DEF;
> + }
> + fim->of_defaults[FIM_CL_TOLERANCE_MIN] = tol[0];
> + fim->of_defaults[FIM_CL_TOLERANCE_MAX] = tol[1];
> +
> + fim->icap_channel = -1;
> + if (IS_ENABLED(CONFIG_IMX_GPT_ICAP)) {
> + ret = of_property_read_u32_array(fim_np,
> + "input-capture-channel",
> + icap, 2);
> + if (!ret) {
> + fim->icap_channel = icap[0];
> + fim->icap_flags = icap[1];
> + }
Should you return error otherwise?
> + }
> +
> + of_node_put(fim_np);
> + return 0;
> +}
[snip]
> diff --git a/drivers/staging/media/imx/imx-media-of.c b/drivers/staging/media/imx/imx-media-of.c
> new file mode 100644
> index 0000000..018d05a
> --- /dev/null
> +++ b/drivers/staging/media/imx/imx-media-of.c
> @@ -0,0 +1,291 @@
> +/*
> + * Media driver for Freescale i.MX5/6 SOC
> + *
> + * Open Firmware parsing.
> + *
> + * Copyright (c) 2016 Mentor Graphics Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +#include <linux/of_platform.h>
> +#include <media/v4l2-device.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/v4l2-of.h>
> +#include <media/v4l2-ctrls.h>
Please sort out the list alphabetically.
> +#include <video/imx-ipu-v3.h>
> +#include "imx-media.h"
> +
> +static int of_add_pad_link(struct imx_media_dev *imxmd,
> + struct imx_media_pad *pad,
> + struct device_node *local_sd_node,
> + struct device_node *remote_sd_node,
> + int local_pad, int remote_pad)
> +{
> + dev_dbg(imxmd->dev, "%s: adding %s:%d -> %s:%d\n", __func__,
> + local_sd_node->name, local_pad,
> + remote_sd_node->name, remote_pad);
> +
> + return imx_media_add_pad_link(imxmd, pad, remote_sd_node, NULL,
> + local_pad, remote_pad);
> +}
> +
> +/* parse inputs property from a sensor node */
> +static void of_parse_sensor_inputs(struct imx_media_dev *imxmd,
> + struct imx_media_subdev *sensor,
> + struct device_node *sensor_np)
> +{
> + struct imx_media_sensor_input *sinput = &sensor->input;
> + int ret, i;
> +
> + for (i = 0; i < IMX_MEDIA_MAX_SENSOR_INPUTS; i++) {
> + const char *input_name;
> + u32 val;
> +
> + ret = of_property_read_u32_index(sensor_np, "inputs", i, &val);
> + if (ret)
> + break;
> +
> + sinput->value[i] = val;
> +
> + ret = of_property_read_string_index(sensor_np, "input-names",
> + i, &input_name);
> + /*
> + * if input-names not provided, they will be set using
> + * the subdev name once the sensor is known during
> + * async bind
> + */
> + if (!ret)
> + strncpy(sinput->name[i], input_name,
> + sizeof(sinput->name[i]));
> + }
> +
> + sinput->num = i;
> +
> + /* if no inputs provided just assume a single input */
> + if (sinput->num == 0)
> + sinput->num = 1;
> +}
> +
> +static void of_parse_sensor(struct imx_media_dev *imxmd,
> + struct imx_media_subdev *sensor,
> + struct device_node *sensor_np)
> +{
> + struct device_node *endpoint;
> +
> + of_parse_sensor_inputs(imxmd, sensor, sensor_np);
> +
> + endpoint = of_graph_get_next_endpoint(sensor_np, NULL);
> + if (endpoint) {
> + v4l2_of_parse_endpoint(endpoint, &sensor->sensor_ep);
> + of_node_put(endpoint);
> + }
> +}
> +
> +static int of_get_port_count(const struct device_node *np)
> +{
> + struct device_node *child;
> + int num = 0;
> +
> + /* if this node is itself a port, return 1 */
> + if (of_node_cmp(np->name, "port") == 0)
> + return 1;
> +
> + for_each_child_of_node(np, child) {
> + if (of_node_cmp(child->name, "port") == 0)
> + num++;
> + }
Unneeded bracers.
> + return num;
> +}
> +
> +/*
> + * find the remote device node and remote port id (remote pad #)
> + * given local endpoint node
> + */
> +static void of_get_remote_pad(struct device_node *epnode,
> + struct device_node **remote_node,
> + int *remote_pad)
> +{
> + struct device_node *rp, *rpp;
> + struct device_node *remote;
> +
> + rp = of_graph_get_remote_port(epnode);
> + rpp = of_graph_get_remote_port_parent(epnode);
> +
> + if (of_device_is_compatible(rpp, "fsl,imx6q-ipu")) {
> + /* the remote is one of the CSI ports */
> + remote = rp;
> + *remote_pad = 0;
> + of_node_put(rpp);
> + } else {
> + remote = rpp;
> + of_property_read_u32(rp, "reg", remote_pad);
> + of_node_put(rp);
> + }
> +
> + if (!remote || !of_device_is_available(remote)) {
> + of_node_put(remote);
> + *remote_node = NULL;
> + } else {
> + *remote_node = remote;
> + }
> +}
> +
> +static struct imx_media_subdev *
> +of_parse_subdev(struct imx_media_dev *imxmd, struct device_node *sd_np,
> + bool is_csi_port)
> +{
> + struct imx_media_subdev *imxsd;
> + int i, num_pads, ret;
> +
> + if (!of_device_is_available(sd_np)) {
> + dev_dbg(imxmd->dev, "%s: %s not enabled\n", __func__,
> + sd_np->name);
> + return NULL;
> + }
> +
> + /* register this subdev with async notifier */
> + imxsd = imx_media_add_async_subdev(imxmd, sd_np, NULL);
> + if (!imxsd)
> + return NULL;
> + if (IS_ERR(imxsd))
> + return imxsd;
if (IS_ERR_OR_NULL(imxsd))
return imxsd;
> +
> + if (is_csi_port) {
> + /*
> + * the ipu-csi has one sink port and one source port.
> + * The source port is not represented in the device tree,
> + * but is described by the internal pads and links later.
> + */
> + num_pads = 2;
> + imxsd->num_sink_pads = 1;
> + } else if (of_device_is_compatible(sd_np, "fsl,imx-mipi-csi2")) {
> + num_pads = of_get_port_count(sd_np);
> + /* the mipi csi2 receiver has only one sink port */
> + imxsd->num_sink_pads = 1;
> + } else if (of_device_is_compatible(sd_np, "imx-video-mux")) {
> + num_pads = of_get_port_count(sd_np);
> + /* for the video mux, all but the last port are sinks */
> + imxsd->num_sink_pads = num_pads - 1;
> + } else {
> + /* must be a sensor */
> + num_pads = 1;
> + imxsd->num_sink_pads = 0;
> + }
> +
> + if (imxsd->num_sink_pads >= num_pads)
> + return ERR_PTR(-EINVAL);
> +
> + imxsd->num_src_pads = num_pads - imxsd->num_sink_pads;
> +
> + dev_dbg(imxmd->dev, "%s: %s has %d pads (%d sink, %d src)\n",
> + __func__, sd_np->name, num_pads,
> + imxsd->num_sink_pads, imxsd->num_src_pads);
> +
> + if (imxsd->num_sink_pads == 0) {
> + /* this might be a sensor */
> + of_parse_sensor(imxmd, imxsd, sd_np);
> + }
Unneeded bracers.
> +
> + for (i = 0; i < num_pads; i++) {
> + struct device_node *epnode = NULL, *port, *remote_np;
> + struct imx_media_subdev *remote_imxsd;
> + struct imx_media_pad *pad;
> + int remote_pad;
Too deep indentation, may be move the cycle body into a separate function?
> +
> + /* init this pad */
> + pad = &imxsd->pad[i];
> + pad->pad.flags = (i < imxsd->num_sink_pads) ?
> + MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
> +
> + if (is_csi_port)
> + port = (i < imxsd->num_sink_pads) ? sd_np : NULL;
> + else
> + port = of_graph_get_port_by_id(sd_np, i);
> + if (!port)
> + continue;
> +
> + while ((epnode = of_get_next_child(port, epnode))) {
Please reuse for_each_child_of_node() here.
> + of_get_remote_pad(epnode, &remote_np, &remote_pad);
> + if (!remote_np) {
> + of_node_put(epnode);
Please remove of_node_put() here, of_get_next_child() does it.
> + continue;
> + }
> +
> + ret = of_add_pad_link(imxmd, pad, sd_np, remote_np,
> + i, remote_pad);
> + if (ret) {
> + imxsd = ERR_PTR(ret);
> + break;
> + }
> +
> + if (i < imxsd->num_sink_pads) {
> + /* follow sink endpoints upstream */
> + remote_imxsd = of_parse_subdev(imxmd,
> + remote_np,
> + false);
> + if (IS_ERR(remote_imxsd)) {
> + imxsd = remote_imxsd;
> + break;
> + }
> + }
> +
> + of_node_put(remote_np);
> + of_node_put(epnode);
> + }
> +
> + if (port != sd_np)
> + of_node_put(port);
> + if (IS_ERR(imxsd)) {
> + of_node_put(remote_np);
> + of_node_put(epnode);
> + break;
> + }
> + }
> +
> + return imxsd;
> +}
> +
> +int imx_media_of_parse(struct imx_media_dev *imxmd,
> + struct imx_media_subdev *(*csi)[4],
> + struct device_node *np)
> +{
> + struct device_node *csi_np;
> + struct imx_media_subdev *lcsi;
Please swap two lines above to get the reverse christmas tree ordering.
> + u32 ipu_id, csi_id;
> + int i, ret;
> +
> + for (i = 0; ; i++) {
> + csi_np = of_parse_phandle(np, "ports", i);
> + if (!csi_np)
> + break;
> +
> + lcsi = of_parse_subdev(imxmd, csi_np, true);
> + if (IS_ERR(lcsi)) {
> + ret = PTR_ERR(lcsi);
> + goto err_put;
> + }
> +
> + of_property_read_u32(csi_np, "reg", &csi_id);
Not sure if it is safe enough to ignore return value and potentially
left csi_id uninitialized.
> + ipu_id = of_alias_get_id(csi_np->parent, "ipu");
> +
> + if (ipu_id > 1 || csi_id > 1) {
> + dev_err(imxmd->dev, "%s: invalid ipu/csi id (%u/%u)\n",
> + __func__, ipu_id, csi_id);
> + ret = -EINVAL;
> + goto err_put;
> + }
> +
> + of_node_put(csi_np);
You can put the node right after of_alias_get_id() call, then in case
of error return right from the if block and remove the goto label.
> +
> + (*csi)[ipu_id * 2 + csi_id] = lcsi;
> + }
> +
> + return 0;
> +err_put:
> + of_node_put(csi_np);
> + return ret;
> +}
> diff --git a/drivers/staging/media/imx/imx-media-of.h b/drivers/staging/media/imx/imx-media-of.h
> new file mode 100644
> index 0000000..0c61b05
> --- /dev/null
> +++ b/drivers/staging/media/imx/imx-media-of.h
> @@ -0,0 +1,25 @@
> +/*
> + * V4L2 Media Controller Driver for Freescale i.MX5/6 SOC
> + *
> + * Open Firmware parsing.
> + *
> + * Copyright (c) 2016 Mentor Graphics Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +#ifndef _IMX_MEDIA_OF_H
> +#define _IMX_MEDIA_OF_H
> +
I do believe you should include some headers or add declarations
of "struct imx_media_dev", "struct imx_media_subdev", "struct device_node".
> +struct imx_media_subdev *
> +imx_media_of_find_subdev(struct imx_media_dev *imxmd,
> + struct device_node *np,
> + const char *name);
> +
> +int imx_media_of_parse(struct imx_media_dev *dev,
> + struct imx_media_subdev *(*csi)[4],
> + struct device_node *np);
> +
> +#endif
> diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
> new file mode 100644
> index 0000000..6a018a9
> --- /dev/null
> +++ b/drivers/staging/media/imx/imx-media.h
> @@ -0,0 +1,299 @@
> +/*
> + * V4L2 Media Controller Driver for Freescale i.MX5/6 SOC
> + *
> + * Copyright (c) 2016 Mentor Graphics Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +#ifndef _IMX_MEDIA_H
> +#define _IMX_MEDIA_H
Please insert here an empty line to improve readability.
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-of.h>
Please sort out the list alphabetically.
> +#include <media/videobuf2-dma-contig.h>
> +#include <video/imx-ipu-v3.h>
> +
> +/*
> + * This is somewhat arbitrary, but we need at least:
> + * - 2 camera interface subdevs
> + * - 3 IC subdevs
> + * - 2 CSI subdevs
> + * - 1 mipi-csi2 receiver subdev
> + * - 2 video-mux subdevs
> + * - 3 camera sensor subdevs (2 parallel, 1 mipi-csi2)
> + *
> + * And double the above numbers for quad i.mx!
> + */
[snip]
--
With best wishes,
Vladimir
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