diff mbox series

[13/16] media: ti-vpe: csi2rx: Add CSI2RX support

Message ID 20210330173348.30135-14-p.yadav@ti.com
State New
Headers show
Series CSI2RX support on J721E | expand

Commit Message

Pratyush Yadav March 30, 2021, 5:33 p.m. UTC
TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate
capture over a CSI-2 bus.

The Cadence CSI2RX IP acts as a bridge between the TI specific parts and
the CSI-2 protocol parts. TI then has a wrapper on top of this bridge
called the SHIM layer. It takes in data from stream 0, repacks it, and
sends it to memory over PSI-L DMA.

This driver acts as the "front end" to V4L2 client applications. It
implements the required ioctls and buffer operations, passes the
necessary calls on to the bridge, programs the SHIM layer, and performs
DMA via the dmaengine API to finally return the data to a buffer
supplied by the application.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 MAINTAINERS                               |   7 +
 drivers/media/platform/Kconfig            |  11 +
 drivers/media/platform/ti-vpe/Makefile    |   1 +
 drivers/media/platform/ti-vpe/ti-csi2rx.c | 964 ++++++++++++++++++++++
 4 files changed, 983 insertions(+)
 create mode 100644 drivers/media/platform/ti-vpe/ti-csi2rx.c

Comments

Benoit Parrot March 31, 2021, 3:44 p.m. UTC | #1
Pratyush,

Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> wrote on Wed [2021-Mar-31 09:06:35 +0300]:
> Hi,
> 
> On 30/03/2021 20:33, Pratyush Yadav wrote:
> > TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate
> > capture over a CSI-2 bus.
> > 
> > The Cadence CSI2RX IP acts as a bridge between the TI specific parts and
> > the CSI-2 protocol parts. TI then has a wrapper on top of this bridge
> > called the SHIM layer. It takes in data from stream 0, repacks it, and
> > sends it to memory over PSI-L DMA.
> > 
> > This driver acts as the "front end" to V4L2 client applications. It
> > implements the required ioctls and buffer operations, passes the
> > necessary calls on to the bridge, programs the SHIM layer, and performs
> > DMA via the dmaengine API to finally return the data to a buffer
> > supplied by the application.
> > 
> > Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> > ---
> >   MAINTAINERS                               |   7 +
> >   drivers/media/platform/Kconfig            |  11 +
> >   drivers/media/platform/ti-vpe/Makefile    |   1 +
> >   drivers/media/platform/ti-vpe/ti-csi2rx.c | 964 ++++++++++++++++++++++
> >   4 files changed, 983 insertions(+)
> >   create mode 100644 drivers/media/platform/ti-vpe/ti-csi2rx.c
> 
> Some quick comments:
> 
> "ti-vpe" directory is not correct, this has nothing to do with VPE. That
> said, the directory has already been abused by having CAL driver there,
> perhaps we should rename the directory just to "ti". But if we do that,
> I think we should have subdirs for cal, vpe and this new one.

I agree with Tomi here. This should create a ti directory under
media/platform and then add a directory under that specifically for this
driver/IP as a first step. Not sure what the correct name for that
directory should be but it should meaningful. As a follow on step then the
other drivers can be relocated to a proper directory structure.
> 
> "ti-csi2rx" is rather generic name. TI has had CSI-2 RX IPs before (CAL)
> and probably will also have new ones in the future. If there's no clear
> model name for the IP, as I think is the case here, it's probably best
> to just use the SoC model in the name. E.g. the DSS on J7 is
> "ti,j721e-dss".
> 
> This driver implements the legacy video API. I think it would be better
> (and easier to maintain) to only implement the media-controller API,
> unless you specifically need to support the legacy API for existing
> userspace.

We just went through a major rework with CAL to make it media controller
compatible in order to be able to handle CSI2 virtual channels.
I think as this is a new driver/IP which perform the same type of service
it makes sense to make use the more current API instead of the legacy one.

> 
>  Tomi

Benoit
Laurent Pinchart March 31, 2021, 3:50 p.m. UTC | #2
On Wed, Mar 31, 2021 at 10:44:57AM -0500, Benoit Parrot wrote:
> Pratyush,
> 
> Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> wrote on Wed [2021-Mar-31 09:06:35 +0300]:
> > Hi,
> > 
> > On 30/03/2021 20:33, Pratyush Yadav wrote:
> > > TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate
> > > capture over a CSI-2 bus.
> > > 
> > > The Cadence CSI2RX IP acts as a bridge between the TI specific parts and
> > > the CSI-2 protocol parts. TI then has a wrapper on top of this bridge
> > > called the SHIM layer. It takes in data from stream 0, repacks it, and
> > > sends it to memory over PSI-L DMA.
> > > 
> > > This driver acts as the "front end" to V4L2 client applications. It
> > > implements the required ioctls and buffer operations, passes the
> > > necessary calls on to the bridge, programs the SHIM layer, and performs
> > > DMA via the dmaengine API to finally return the data to a buffer
> > > supplied by the application.
> > > 
> > > Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> > > ---
> > >   MAINTAINERS                               |   7 +
> > >   drivers/media/platform/Kconfig            |  11 +
> > >   drivers/media/platform/ti-vpe/Makefile    |   1 +
> > >   drivers/media/platform/ti-vpe/ti-csi2rx.c | 964 ++++++++++++++++++++++
> > >   4 files changed, 983 insertions(+)
> > >   create mode 100644 drivers/media/platform/ti-vpe/ti-csi2rx.c
> > 
> > Some quick comments:
> > 
> > "ti-vpe" directory is not correct, this has nothing to do with VPE. That
> > said, the directory has already been abused by having CAL driver there,
> > perhaps we should rename the directory just to "ti". But if we do that,
> > I think we should have subdirs for cal, vpe and this new one.
> 
> I agree with Tomi here. This should create a ti directory under
> media/platform and then add a directory under that specifically for this
> driver/IP as a first step. Not sure what the correct name for that
> directory should be but it should meaningful. As a follow on step then the
> other drivers can be relocated to a proper directory structure.

+1, including for the relocation if possible.

> > "ti-csi2rx" is rather generic name. TI has had CSI-2 RX IPs before (CAL)
> > and probably will also have new ones in the future. If there's no clear
> > model name for the IP, as I think is the case here, it's probably best
> > to just use the SoC model in the name. E.g. the DSS on J7 is
> > "ti,j721e-dss".
> > 
> > This driver implements the legacy video API. I think it would be better
> > (and easier to maintain) to only implement the media-controller API,
> > unless you specifically need to support the legacy API for existing
> > userspace.
> 
> We just went through a major rework with CAL to make it media controller
> compatible in order to be able to handle CSI2 virtual channels.
> I think as this is a new driver/IP which perform the same type of service
> it makes sense to make use the more current API instead of the legacy one.

+2 :-)
Péter Ujfalusi April 4, 2021, 1:38 p.m. UTC | #3
Hi Pratyush,

+1 from me also to the points Tomi raised.

few minor comments on the DMAengie side.

On 3/30/21 8:33 PM, Pratyush Yadav wrote:
> TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate

> capture over a CSI-2 bus.

> 

> The Cadence CSI2RX IP acts as a bridge between the TI specific parts and

> the CSI-2 protocol parts. TI then has a wrapper on top of this bridge

> called the SHIM layer. It takes in data from stream 0, repacks it, and

> sends it to memory over PSI-L DMA.

> 

> This driver acts as the "front end" to V4L2 client applications. It

> implements the required ioctls and buffer operations, passes the

> necessary calls on to the bridge, programs the SHIM layer, and performs

> DMA via the dmaengine API to finally return the data to a buffer

> supplied by the application.

> 

> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>

> ---

>  MAINTAINERS                               |   7 +

>  drivers/media/platform/Kconfig            |  11 +

>  drivers/media/platform/ti-vpe/Makefile    |   1 +

>  drivers/media/platform/ti-vpe/ti-csi2rx.c | 964 ++++++++++++++++++++++

>  4 files changed, 983 insertions(+)

>  create mode 100644 drivers/media/platform/ti-vpe/ti-csi2rx.c


...

> diff --git a/drivers/media/platform/ti-vpe/ti-csi2rx.c b/drivers/media/platform/ti-vpe/ti-csi2rx.c

> new file mode 100644

> index 000000000000..355204ae473b

> --- /dev/null

> +++ b/drivers/media/platform/ti-vpe/ti-csi2rx.c


...

> +static int ti_csi2rx_init_vb2q(struct ti_csi2rx_dev *csi)

> +{

> +	struct vb2_queue *q = &csi->vidq;

> +	int ret;

> +

> +	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

> +	q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;

> +	q->drv_priv = csi;

> +	q->buf_struct_size = sizeof(struct ti_csi2rx_buffer);

> +	q->ops = &csi_vb2_qops;

> +	q->mem_ops = &vb2_dma_contig_memops;

> +	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;

> +	q->dev = csi->dma->device->dev;


q->dev = dmaengine_get_dma_device(csi->dma);

> +	q->lock = &csi->mutex;

> +

> +	ret = vb2_queue_init(q);

> +	if (ret)

> +		return ret;

> +

> +	csi->vdev.queue = q;

> +

> +	return 0;

> +}

> +

> +static int ti_csi2rx_init_dma(struct ti_csi2rx_dev *csi)

> +{

> +	struct dma_slave_config cfg;

> +	int ret;

> +

> +	INIT_LIST_HEAD(&csi->dmaq.list);

> +

> +	csi->dma = NULL;

> +

> +	csi->dma = dma_request_chan(csi->dev, "rx0");

> +	if (IS_ERR(csi->dma))

> +		return PTR_ERR(csi->dma);

> +

> +	memset(&cfg, 0, sizeof(cfg));

> +

> +	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_16_BYTES;

> +	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_16_BYTES;


No need to set the dst_addr_width as you only support RX.

Another note: UDMA with PSI-L native peripherals ignores this
cofniguration, only used for PDMAs, but I can remain to future proof the
driver and to keep it generic.

> +

> +	ret = dmaengine_slave_config(csi->dma, &cfg);

> +	if (ret)

> +		return ret;

> +

> +	return 0;

> +}


-- 
Péter
Pratyush Yadav April 6, 2021, 3:05 p.m. UTC | #4
On 31/03/21 09:06AM, Tomi Valkeinen wrote:
> Hi,

> 

> On 30/03/2021 20:33, Pratyush Yadav wrote:

> > TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate

> > capture over a CSI-2 bus.

> > 

> > The Cadence CSI2RX IP acts as a bridge between the TI specific parts and

> > the CSI-2 protocol parts. TI then has a wrapper on top of this bridge

> > called the SHIM layer. It takes in data from stream 0, repacks it, and

> > sends it to memory over PSI-L DMA.

> > 

> > This driver acts as the "front end" to V4L2 client applications. It

> > implements the required ioctls and buffer operations, passes the

> > necessary calls on to the bridge, programs the SHIM layer, and performs

> > DMA via the dmaengine API to finally return the data to a buffer

> > supplied by the application.

> > 

> > Signed-off-by: Pratyush Yadav <p.yadav@ti.com>

> > ---

> >   MAINTAINERS                               |   7 +

> >   drivers/media/platform/Kconfig            |  11 +

> >   drivers/media/platform/ti-vpe/Makefile    |   1 +

> >   drivers/media/platform/ti-vpe/ti-csi2rx.c | 964 ++++++++++++++++++++++

> >   4 files changed, 983 insertions(+)

> >   create mode 100644 drivers/media/platform/ti-vpe/ti-csi2rx.c

> 

> Some quick comments:

> 

> "ti-vpe" directory is not correct, this has nothing to do with VPE. That

> said, the directory has already been abused by having CAL driver there,

> perhaps we should rename the directory just to "ti". But if we do that, I

> think we should have subdirs for cal, vpe and this new one.


Right. I thought about doing this but then figured "let's just follow 
what CAL does". Will move them into separate subdirectories.

> 

> "ti-csi2rx" is rather generic name. TI has had CSI-2 RX IPs before (CAL) and

> probably will also have new ones in the future. If there's no clear model

> name for the IP, as I think is the case here, it's probably best to just use

> the SoC model in the name. E.g. the DSS on J7 is "ti,j721e-dss".


Ok.

> 

> This driver implements the legacy video API. I think it would be better (and

> easier to maintain) to only implement the media-controller API, unless you

> specifically need to support the legacy API for existing userspace.


:-(

I'm afraid the documentation has let me down here. There is no clear 
mention about the fact that media controller API replaces the "legacy" 
API. In fact, [0] seems to suggest that the media controller API is 
optional.

  Bridge drivers traditionally expose one or multiple video nodes to 
  userspace, and control subdevices through the v4l2_subdev_ops 
  operations in response to video node operations. This hides the 
  complexity of the underlying hardware from applications. For complex 
  devices, finer-grained control of the device than what the video nodes 
  offer may be required. In those cases, bridge drivers that implement 
  the media controller API may opt for making the subdevice operations 
  directly accessible from userpace.

Anyway, I don't think supporting the legacy API makes much sense since 
this is a new driver. Will convert it to use the MC API. We can always 
add the legacy API support if some application demands it.

[0] https://www.kernel.org/doc/html/latest/driver-api/media/v4l2-subdev.html#v4l2-sub-device-userspace-api

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 8c44fd8fd85d..06fb8fdb874d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18006,6 +18006,13 @@  S:	Odd Fixes
 F:	drivers/clk/ti/
 F:	include/linux/clk/ti.h
 
+TI CSI2RX DRIVER
+M:	Pratyush Yadav <p.yadav@ti.com>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/ti,csi2rx.yaml
+F:	drivers/media/platform/ti-vpe/ti-csi2rx.c
+
 TI DAVINCI MACHINE SUPPORT
 M:	Sekhar Nori <nsekhar@ti.com>
 R:	Bartosz Golaszewski <bgolaszewski@baylibre.com>
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index b238a923d1b4..3b240d8e4cb8 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -200,6 +200,17 @@  config VIDEO_TI_CAL_MC
 
 endif # VIDEO_TI_CAL
 
+config VIDEO_TI_CSI2RX
+	tristate "TI CSI2RX wrapper layer driver"
+	depends on VIDEO_DEV && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && MEDIA_SUPPORT
+	depends on PHY_CADENCE_DPHY && VIDEO_CADENCE_CSI2RX
+	depends on ARCH_K3 || COMPILE_TEST
+	select VIDEOBUF2_DMA_CONTIG
+	select V4L2_FWNODE
+	help
+	  Support for TI CSI2RX wrapper layer. This just enables the wrapper driver.
+	  The Cadence CSI2RX bridge driver needs to be enabled separately.
+
 endif # V4L_PLATFORM_DRIVERS
 
 menuconfig V4L_MEM2MEM_DRIVERS
diff --git a/drivers/media/platform/ti-vpe/Makefile b/drivers/media/platform/ti-vpe/Makefile
index ad624056e039..c4ee49484b73 100644
--- a/drivers/media/platform/ti-vpe/Makefile
+++ b/drivers/media/platform/ti-vpe/Makefile
@@ -3,6 +3,7 @@  obj-$(CONFIG_VIDEO_TI_VPE) += ti-vpe.o
 obj-$(CONFIG_VIDEO_TI_VPDMA) += ti-vpdma.o
 obj-$(CONFIG_VIDEO_TI_SC) += ti-sc.o
 obj-$(CONFIG_VIDEO_TI_CSC) += ti-csc.o
+obj-$(CONFIG_VIDEO_TI_CSI2RX) += ti-csi2rx.o
 
 ti-vpe-y := vpe.o
 ti-vpdma-y := vpdma.o
diff --git a/drivers/media/platform/ti-vpe/ti-csi2rx.c b/drivers/media/platform/ti-vpe/ti-csi2rx.c
new file mode 100644
index 000000000000..355204ae473b
--- /dev/null
+++ b/drivers/media/platform/ti-vpe/ti-csi2rx.c
@@ -0,0 +1,964 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TI CSI2 RX driver.
+ *
+ * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com/
+ *
+ * Author: Pratyush Yadav <p.yadav@ti.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dmaengine.h>
+#include <linux/of_platform.h>
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-dma-contig.h>
+
+#define TI_CSI2RX_MODULE_NAME		"ti-csi2rx"
+
+#define SHIM_CNTL			0x10
+#define SHIM_CNTL_PIX_RST		BIT(0)
+
+#define SHIM_DMACNTX			0x20
+#define SHIM_DMACNTX_EN			BIT(31)
+#define SHIM_DMACNTX_YUV422		GENMASK(27, 26)
+#define SHIM_DMACNTX_FMT		GENMASK(5, 0)
+#define SHIM_DMACNTX_UYVY		0
+#define SHIM_DMACNTX_VYUY		1
+#define SHIM_DMACNTX_YUYV		2
+#define SHIM_DMACNTX_YVYU		3
+
+#define SHIM_PSI_CFG0			0x24
+#define SHIM_PSI_CFG0_SRC_TAG		GENMASK(15, 0)
+#define SHIM_PSI_CFG0_DST_TAG		GENMASK(31, 15)
+
+#define CSI_DF_YUV420			0x18
+#define CSI_DF_YUV422			0x1e
+#define CSI_DF_RGB444			0x20
+#define CSI_DF_RGB888			0x24
+
+struct ti_csi2rx_fmt {
+	u32				fourcc;	/* Four character code. */
+	u32				code;	/* Mbus code. */
+	u32				csi_df;	/* CSI Data format. */
+	u8				bpp;	/* Bits per pixel. */
+};
+
+struct ti_csi2rx_buffer {
+	/* Common v4l2 buffer. Must be first. */
+	struct vb2_v4l2_buffer		vb;
+	struct list_head		list;
+};
+
+struct ti_csi2rx_dmaq {
+	struct list_head		list;
+};
+
+struct ti_csi2rx_dev {
+	struct device			*dev;
+	void __iomem			*shim;
+	struct v4l2_device		v4l2_dev;
+	struct video_device		vdev;
+	struct media_device		mdev;
+	struct v4l2_async_notifier	notifier;
+	struct v4l2_subdev		*subdev;
+	struct vb2_queue		vidq;
+	struct mutex			mutex; /* To serialize ioctls. */
+	const struct ti_csi2rx_fmt	**supported_fmts;
+	unsigned int			num_supported_fmts;
+	struct v4l2_format		v_fmt;
+	struct dma_chan			*dma;
+	struct ti_csi2rx_dmaq		dmaq;
+	u32				sequence;
+};
+
+static const struct ti_csi2rx_fmt formats[] = {
+	{
+		.fourcc			= V4L2_PIX_FMT_YUYV,
+		.code			= MEDIA_BUS_FMT_YUYV8_2X8,
+		.csi_df			= CSI_DF_YUV422,
+		.bpp			= 16,
+	}, {
+		.fourcc			= V4L2_PIX_FMT_UYVY,
+		.code			= MEDIA_BUS_FMT_UYVY8_2X8,
+		.csi_df			= CSI_DF_YUV422,
+		.bpp			= 16,
+	}, {
+		.fourcc			= V4L2_PIX_FMT_YVYU,
+		.code			= MEDIA_BUS_FMT_YVYU8_2X8,
+		.csi_df			= CSI_DF_YUV422,
+		.bpp			= 16,
+	}, {
+		.fourcc			= V4L2_PIX_FMT_VYUY,
+		.code			= MEDIA_BUS_FMT_VYUY8_2X8,
+		.csi_df			= CSI_DF_YUV422,
+		.bpp			= 16,
+	},
+
+	/* More formats can be supported but they are not listed for now. */
+};
+
+/* Forward declaration needed by ti_csi2rx_dma_callback. */
+static int ti_csi2rx_start_dma(struct ti_csi2rx_dev *csi,
+			       struct ti_csi2rx_buffer *buf);
+
+static const struct ti_csi2rx_fmt *find_format_by_pix(struct ti_csi2rx_dev *csi,
+						      u32 pixelformat)
+{
+	const struct ti_csi2rx_fmt *fmt;
+	unsigned int i;
+
+	for (i = 0; i < csi->num_supported_fmts; i++) {
+		fmt = csi->supported_fmts[i];
+		if (fmt->fourcc == pixelformat)
+			return fmt;
+	}
+
+	return NULL;
+}
+
+static const struct ti_csi2rx_fmt *find_format_by_code(struct ti_csi2rx_dev *csi,
+						       u32 code)
+{
+	const struct ti_csi2rx_fmt *fmt;
+	unsigned int i;
+
+	for (i = 0; i < csi->num_supported_fmts; i++) {
+		fmt = csi->supported_fmts[i];
+		if (fmt->code == code)
+			return fmt;
+	}
+
+	return NULL;
+}
+
+static void ti_csi2rx_fill_fmt(struct v4l2_mbus_framefmt *mbus_fmt,
+			       const struct ti_csi2rx_fmt *csi_fmt,
+			       struct v4l2_format *v4l2_fmt)
+{
+	u32 bpl;
+
+	v4l2_fill_pix_format(&v4l2_fmt->fmt.pix, mbus_fmt);
+	v4l2_fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	v4l2_fmt->fmt.pix.pixelformat = csi_fmt->fourcc;
+	v4l2_fmt->fmt.pix.sizeimage = v4l2_fmt->fmt.pix.height *
+				       v4l2_fmt->fmt.pix.width *
+				       (csi_fmt->bpp / 8);
+
+	bpl = (v4l2_fmt->fmt.pix.width * ALIGN(csi_fmt->bpp, 8)) >> 3;
+	v4l2_fmt->fmt.pix.bytesperline = ALIGN(bpl, 16);
+}
+
+static int ti_csi2rx_init_formats(struct ti_csi2rx_dev *csi)
+{
+	struct v4l2_subdev_mbus_code_enum mbus_code;
+	struct v4l2_mbus_framefmt mbus_fmt;
+	struct v4l2_subdev_format sd_fmt;
+	const struct ti_csi2rx_fmt *fmt;
+	unsigned int i, j, k;
+	int ret = 0;
+
+	csi->supported_fmts = devm_kcalloc(csi->dev, ARRAY_SIZE(formats),
+					   sizeof(*csi->supported_fmts),
+					   GFP_KERNEL);
+	if (!csi->supported_fmts)
+		return -ENOMEM;
+
+	csi->num_supported_fmts = 0;
+
+	/* Find a set of formarts supported by both CSI2RX and camera. */
+	for (j = 0, i = 0; ret != -EINVAL; j++) {
+		memset(&mbus_code, 0, sizeof(mbus_code));
+		mbus_code.index = j;
+		mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+		ret = v4l2_subdev_call(csi->subdev, pad, enum_mbus_code, NULL,
+				       &mbus_code);
+		if (ret)
+			continue;
+
+		for (k = 0; k < ARRAY_SIZE(formats); k++) {
+			const struct ti_csi2rx_fmt *fmt = &formats[k];
+
+			if (mbus_code.code == fmt->code) {
+				csi->supported_fmts[i] = fmt;
+				csi->num_supported_fmts = ++i;
+			}
+		}
+	}
+
+	if (i == 0)
+		return -EINVAL; /* No format mutually supported. */
+
+	/* Get the current format from the subdev. */
+	sd_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	sd_fmt.pad = 0;
+
+	ret = v4l2_subdev_call(csi->subdev, pad, get_fmt, NULL, &sd_fmt);
+	if (ret)
+		return ret;
+
+	mbus_fmt = sd_fmt.format;
+
+	fmt = find_format_by_code(csi, mbus_fmt.code);
+	if (!fmt)
+		return -EINVAL;
+
+	/*
+	 * YUV422 8-bit should always be sent by the camera in UYVY. Format
+	 * conversions to other YUV422 formats will be done later by SHIM.
+	 */
+	if (fmt->csi_df == CSI_DF_YUV422 &&
+	    fmt->code != MEDIA_BUS_FMT_UYVY8_2X8) {
+		sd_fmt.format.code = MEDIA_BUS_FMT_UYVY8_2X8;
+		ret = v4l2_subdev_call(csi->subdev, pad, set_fmt, NULL, &sd_fmt);
+		if (ret)
+			return ret;
+	}
+
+	ti_csi2rx_fill_fmt(&mbus_fmt, fmt, &csi->v_fmt);
+
+	return 0;
+}
+
+static int ti_csi2rx_querycap(struct file *file, void *priv,
+			      struct v4l2_capability *cap)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+
+	strscpy(cap->driver, TI_CSI2RX_MODULE_NAME, sizeof(cap->driver));
+	strscpy(cap->card, TI_CSI2RX_MODULE_NAME, sizeof(cap->card));
+
+	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+		 dev_name(csi->dev));
+
+	return 0;
+}
+
+static int ti_csi2rx_enum_fmt_vid_cap(struct file *file, void *priv,
+				      struct v4l2_fmtdesc *f)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+	const struct ti_csi2rx_fmt *fmt;
+
+	if (f->index >= csi->num_supported_fmts)
+		return -EINVAL;
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	fmt = csi->supported_fmts[f->index];
+
+	f->pixelformat = fmt->fourcc;
+
+	return 0;
+}
+
+static int ti_csi2rx_g_fmt_vid_cap(struct file *file, void *prov,
+				   struct v4l2_format *f)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+
+	*f = csi->v_fmt;
+
+	return 0;
+}
+
+static int ti_csi2rx_try_fmt_vid_cap(struct file *file, void *priv,
+				     struct v4l2_format *f)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+	const struct ti_csi2rx_fmt *fmt;
+	struct v4l2_subdev_frame_size_enum fse;
+	int ret, found;
+
+	fmt = find_format_by_pix(csi, f->fmt.pix.pixelformat);
+	if (!fmt) {
+		/* Just get the first one enumerated */
+		fmt = csi->supported_fmts[0];
+		f->fmt.pix.pixelformat = fmt->fourcc;
+	}
+
+	f->fmt.pix.field = csi->v_fmt.fmt.pix.field;
+
+	/* Check for/find a valid width/height. */
+	ret = 0;
+	found = false;
+	fse.pad = 0;
+	fse.code = fmt->code;
+	fse.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	for (fse.index = 0; ; fse.index++) {
+		ret = v4l2_subdev_call(csi->subdev, pad, enum_frame_size, NULL,
+				       &fse);
+		if (ret)
+			break;
+
+		if (f->fmt.pix.width == fse.max_width &&
+		    f->fmt.pix.height == fse.max_height) {
+			found = true;
+			break;
+		} else if (f->fmt.pix.width >= fse.min_width &&
+			   f->fmt.pix.width <= fse.max_width &&
+			   f->fmt.pix.height >= fse.min_height &&
+			   f->fmt.pix.height <= fse.max_height) {
+			found = true;
+			break;
+		}
+	}
+
+	if (!found) {
+		/* use existing values as default */
+		f->fmt.pix.width = csi->v_fmt.fmt.pix.width;
+		f->fmt.pix.height =  csi->v_fmt.fmt.pix.height;
+	}
+
+	/*
+	 * Use current colorspace for now, it will get
+	 * updated properly during s_fmt
+	 */
+	f->fmt.pix.colorspace = csi->v_fmt.fmt.pix.colorspace;
+	f->fmt.pix.sizeimage = f->fmt.pix.width * f->fmt.pix.height *
+			       (fmt->bpp / 8);
+
+	return 0;
+}
+
+static int ti_csi2rx_s_fmt_vid_cap(struct file *file, void *priv,
+				   struct v4l2_format *f)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+	struct vb2_queue *q = &csi->vidq;
+	const struct ti_csi2rx_fmt *fmt;
+	struct v4l2_mbus_framefmt mbus_fmt;
+	struct v4l2_subdev_format sd_fmt;
+	int ret;
+
+	if (vb2_is_busy(q))
+		return -EBUSY;
+
+	ret = ti_csi2rx_try_fmt_vid_cap(file, priv, f);
+	if (ret < 0)
+		return ret;
+
+	fmt = find_format_by_pix(csi, f->fmt.pix.pixelformat);
+	if (!fmt)
+		return -EINVAL;
+
+	v4l2_fill_mbus_format(&mbus_fmt, &f->fmt.pix, fmt->code);
+
+	sd_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	sd_fmt.pad = 0;
+	sd_fmt.format = mbus_fmt;
+
+	/*
+	 * The MIPI CSI-2 spec says that YUV422 8-bit data transmission is
+	 * perfromed using UYVY sequence. So the hardware always expects UYVY
+	 * for YUV422 streams. Ask the subdev to send UYVY data and then we can
+	 * repack it later into the format requested by the application using
+	 * the SHIM layer.
+	 */
+	if (fmt->csi_df == CSI_DF_YUV422)
+		sd_fmt.format.code = MEDIA_BUS_FMT_UYVY8_2X8;
+	else
+		sd_fmt.format.code = fmt->code;
+
+	ret = v4l2_subdev_call(csi->subdev, pad, set_fmt, NULL, &sd_fmt);
+	if (ret)
+		return ret;
+
+	ti_csi2rx_fill_fmt(&mbus_fmt, fmt, &csi->v_fmt);
+	*f = csi->v_fmt;
+
+	return 0;
+}
+
+static int ti_csi2rx_enum_framesizes(struct file *file, void *fh,
+				     struct v4l2_frmsizeenum *fsize)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+	const struct ti_csi2rx_fmt *fmt;
+	struct v4l2_subdev_frame_size_enum fse;
+	int ret;
+
+	fmt = find_format_by_pix(csi, fsize->pixel_format);
+	if (!fmt)
+		return -EINVAL;
+
+	fse.index = fsize->index;
+	fse.code = fmt->code;
+	fse.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	fse.pad = 0;
+
+	ret = v4l2_subdev_call(csi->subdev, pad, enum_frame_size, NULL, &fse);
+	if (ret)
+		return ret;
+
+	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+	fsize->discrete.width = fse.max_width;
+	fsize->discrete.height = fse.max_height;
+
+	return 0;
+}
+
+static int ti_csi2rx_enum_input(struct file *file, void *priv,
+				struct v4l2_input *inp)
+{
+	if (inp->index > 0)
+		return -EINVAL;
+
+	inp->type = V4L2_INPUT_TYPE_CAMERA;
+	snprintf(inp->name, sizeof(inp->name), "Camera %u", inp->index);
+
+	return 0;
+}
+
+static int ti_csi2rx_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	*i = 0;
+	return 0;
+}
+
+static int ti_csi2rx_s_input(struct file *file, void *priv, unsigned int i)
+{
+	return i > 0 ? -EINVAL : 0;
+}
+
+static int ti_csi2rx_enum_frameintervals(struct file *file, void *priv,
+					 struct v4l2_frmivalenum *fival)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+	const struct ti_csi2rx_fmt *fmt;
+	struct v4l2_subdev_frame_interval_enum fie = {
+		.index = fival->index,
+		.width = fival->width,
+		.height = fival->height,
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+	int ret;
+
+	fmt = find_format_by_pix(csi, fival->pixel_format);
+	if (!fmt)
+		return -EINVAL;
+
+	fie.code = fmt->code;
+	ret = v4l2_subdev_call(csi->subdev, pad, enum_frame_interval,
+			       NULL, &fie);
+	if (ret)
+		return ret;
+	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+	fival->discrete = fie.interval;
+
+	return 0;
+}
+
+static int ti_csi2rx_g_parm(struct file *file, void *fh,
+			    struct v4l2_streamparm *a)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+
+	return v4l2_g_parm_cap(video_devdata(file), csi->subdev, a);
+}
+
+static int ti_csi2rx_s_parm(struct file *file, void *fh,
+			    struct v4l2_streamparm *a)
+{
+	struct ti_csi2rx_dev *csi = video_drvdata(file);
+
+	return v4l2_s_parm_cap(video_devdata(file), csi->subdev, a);
+}
+
+static const struct v4l2_ioctl_ops csi_ioctl_ops = {
+	.vidioc_querycap      = ti_csi2rx_querycap,
+	.vidioc_enum_fmt_vid_cap = ti_csi2rx_enum_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap = ti_csi2rx_try_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap = ti_csi2rx_g_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap = ti_csi2rx_s_fmt_vid_cap,
+	.vidioc_enum_framesizes = ti_csi2rx_enum_framesizes,
+	.vidioc_enum_input    = ti_csi2rx_enum_input,
+	.vidioc_g_input       = ti_csi2rx_g_input,
+	.vidioc_s_input       = ti_csi2rx_s_input,
+	.vidioc_enum_frameintervals = ti_csi2rx_enum_frameintervals,
+	.vidioc_g_parm        = ti_csi2rx_g_parm,
+	.vidioc_s_parm        = ti_csi2rx_s_parm,
+	.vidioc_reqbufs       = vb2_ioctl_reqbufs,
+	.vidioc_create_bufs   = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf   = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf      = vb2_ioctl_querybuf,
+	.vidioc_qbuf          = vb2_ioctl_qbuf,
+	.vidioc_dqbuf         = vb2_ioctl_dqbuf,
+	.vidioc_expbuf        = vb2_ioctl_expbuf,
+	.vidioc_streamon      = vb2_ioctl_streamon,
+	.vidioc_streamoff     = vb2_ioctl_streamoff,
+};
+
+static const struct v4l2_file_operations csi_fops = {
+	.owner = THIS_MODULE,
+	.open = v4l2_fh_open,
+	.release = vb2_fop_release,
+	.read = vb2_fop_read,
+	.poll = vb2_fop_poll,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap = vb2_fop_mmap,
+};
+
+static int ti_csi2rx_init_video(struct ti_csi2rx_dev *csi)
+{
+	struct video_device *vdev = &csi->vdev;
+	int ret;
+
+	strscpy(vdev->name, TI_CSI2RX_MODULE_NAME, sizeof(vdev->name));
+	vdev->v4l2_dev = &csi->v4l2_dev;
+	vdev->vfl_dir = VFL_DIR_RX;
+	vdev->fops = &csi_fops;
+	vdev->ioctl_ops = &csi_ioctl_ops;
+	vdev->release = video_device_release_empty;
+	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
+			    V4L2_CAP_STREAMING;
+	vdev->lock = &csi->mutex;
+	video_set_drvdata(vdev, csi);
+
+	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int csi_async_notifier_bound(struct v4l2_async_notifier *notifier,
+				    struct v4l2_subdev *subdev,
+				    struct v4l2_async_subdev *asd)
+{
+	struct ti_csi2rx_dev *csi = dev_get_drvdata(notifier->v4l2_dev->dev);
+
+	csi->subdev = subdev;
+
+	return 0;
+}
+
+static int csi_async_notifier_complete(struct v4l2_async_notifier *notifier)
+{
+	struct ti_csi2rx_dev *csi = dev_get_drvdata(notifier->v4l2_dev->dev);
+	int ret;
+
+	ret = ti_csi2rx_init_formats(csi);
+	if (ret)
+		return ret;
+
+	ret = ti_csi2rx_init_video(csi);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct v4l2_async_notifier_operations csi_async_notifier_ops = {
+	.bound = csi_async_notifier_bound,
+	.complete = csi_async_notifier_complete,
+};
+
+static int ti_csi2rx_init_subdev(struct ti_csi2rx_dev *csi)
+{
+	struct fwnode_handle *fwnode;
+	struct v4l2_async_subdev *asd;
+	struct device_node *node;
+	int ret;
+
+	node = of_get_child_by_name(csi->dev->of_node, "csi-bridge");
+	if (!node)
+		return -EINVAL;
+
+	v4l2_async_notifier_init(&csi->notifier);
+	csi->notifier.ops = &csi_async_notifier_ops;
+
+	fwnode = of_fwnode_handle(node);
+	if (!fwnode)
+		return -EINVAL;
+
+	asd = v4l2_async_notifier_add_fwnode_subdev(&csi->notifier, fwnode,
+						    struct v4l2_async_subdev);
+	if (IS_ERR(asd))
+		return PTR_ERR(asd);
+
+	ret = v4l2_async_notifier_register(&csi->v4l2_dev, &csi->notifier);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void ti_csi2rx_setup_shim(struct ti_csi2rx_dev *csi)
+{
+	const struct ti_csi2rx_fmt *fmt;
+	unsigned int reg;
+
+	fmt = find_format_by_pix(csi, csi->v_fmt.fmt.pix.pixelformat);
+	if (!fmt) {
+		dev_err(csi->dev, "Unknown format\n");
+		return;
+	}
+
+	/* De-assert the pixel interface reset. */
+	reg = SHIM_CNTL_PIX_RST;
+	writel(reg, csi->shim + SHIM_CNTL);
+
+	reg = SHIM_DMACNTX_EN;
+	reg |= FIELD_PREP(SHIM_DMACNTX_FMT, fmt->csi_df);
+
+	/*
+	 * FIXME: Using the values from the documentation gives incorrect
+	 * ordering for the luma and chroma components. In practice, the
+	 * "reverse" format gives the correct image. So for example, if the
+	 * image is in UYVY, the reverse would be YVYU.
+	 */
+	switch (fmt->fourcc) {
+	case V4L2_PIX_FMT_UYVY:
+		reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
+					SHIM_DMACNTX_YVYU);
+		break;
+	case V4L2_PIX_FMT_VYUY:
+		reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
+					SHIM_DMACNTX_YUYV);
+		break;
+	case V4L2_PIX_FMT_YUYV:
+		reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
+					SHIM_DMACNTX_VYUY);
+		break;
+	case V4L2_PIX_FMT_YVYU:
+		reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
+					SHIM_DMACNTX_UYVY);
+		break;
+	default:
+		/* Ignore if not YUV 4:2:2 */
+		break;
+	}
+
+	writel(reg, csi->shim + SHIM_DMACNTX);
+
+	reg = FIELD_PREP(SHIM_PSI_CFG0_SRC_TAG, 0) |
+	      FIELD_PREP(SHIM_PSI_CFG0_DST_TAG, 1);
+	writel(reg, csi->shim + SHIM_PSI_CFG0);
+}
+
+static void ti_csi2rx_dma_callback(void *param)
+{
+	struct ti_csi2rx_dev *csi = param;
+	struct ti_csi2rx_buffer *buf;
+	struct ti_csi2rx_dmaq *dmaq = &csi->dmaq;
+
+	buf = list_entry(dmaq->list.next, struct ti_csi2rx_buffer, list);
+	list_del(&buf->list);
+
+	buf->vb.vb2_buf.timestamp = ktime_get_ns();
+	buf->vb.sequence = csi->sequence++;
+
+	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+
+	/* If there are more buffers to process then start their transfer. */
+	if (list_empty(&dmaq->list))
+		return;
+
+	buf = list_entry(dmaq->list.next, struct ti_csi2rx_buffer, list);
+
+	if (ti_csi2rx_start_dma(csi, buf))
+		dev_err(csi->dev, "Failed to queue the next buffer for DMA\n");
+}
+
+static int ti_csi2rx_start_dma(struct ti_csi2rx_dev *csi,
+			       struct ti_csi2rx_buffer *buf)
+{
+	unsigned long addr;
+	struct dma_async_tx_descriptor *desc;
+	size_t len = csi->v_fmt.fmt.pix.sizeimage;
+	dma_cookie_t cookie;
+	int ret = 0;
+
+	addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
+	desc = dmaengine_prep_slave_single(csi->dma, addr, len, DMA_DEV_TO_MEM,
+					   DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!desc)
+		return -EIO;
+
+	desc->callback = ti_csi2rx_dma_callback;
+	desc->callback_param = csi;
+
+	cookie = dmaengine_submit(desc);
+	ret = dma_submit_error(cookie);
+	if (ret)
+		return ret;
+
+	dma_async_issue_pending(csi->dma);
+
+	return 0;
+}
+
+static int ti_csi2rx_queue_setup(struct vb2_queue *q, unsigned int *nbuffers,
+				 unsigned int *nplanes, unsigned int sizes[],
+				 struct device *alloc_devs[])
+{
+	struct ti_csi2rx_dev *csi = vb2_get_drv_priv(q);
+	unsigned int size = csi->v_fmt.fmt.pix.sizeimage;
+
+	if (*nplanes) {
+		if (sizes[0] < size)
+			return -EINVAL;
+		size = sizes[0];
+	}
+
+	*nplanes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+static int ti_csi2rx_buffer_prepare(struct vb2_buffer *vb)
+{
+	struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vb->vb2_queue);
+	unsigned long size = csi->v_fmt.fmt.pix.sizeimage;
+
+	if (vb2_plane_size(vb, 0) < size) {
+		dev_err(csi->dev, "Data will not fit into plane\n");
+		return -EINVAL;
+	}
+
+	vb2_set_plane_payload(vb, 0, size);
+	return 0;
+}
+
+static void ti_csi2rx_buffer_queue(struct vb2_buffer *vb)
+{
+	struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vb->vb2_queue);
+	struct ti_csi2rx_buffer *buf;
+	struct ti_csi2rx_dmaq *dmaq = &csi->dmaq;
+
+	buf = container_of(vb, struct ti_csi2rx_buffer, vb.vb2_buf);
+
+	list_add_tail(&buf->list, &dmaq->list);
+}
+
+static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vq);
+	struct ti_csi2rx_dmaq *dmaq = &csi->dmaq;
+	struct ti_csi2rx_buffer *buf, *tmp;
+	int ret;
+
+	if (list_empty(&dmaq->list))
+		return -EIO;
+
+	ti_csi2rx_setup_shim(csi);
+
+	ret = v4l2_subdev_call(csi->subdev, video, s_stream, 1);
+	if (ret)
+		goto err;
+
+	csi->sequence = 0;
+
+	buf = list_entry(dmaq->list.next, struct ti_csi2rx_buffer, list);
+	ret = ti_csi2rx_start_dma(csi, buf);
+	if (ret) {
+		dev_err(csi->dev, "Failed to start DMA: %d\n", ret);
+		goto err;
+	}
+
+	return 0;
+
+err:
+	v4l2_subdev_call(csi->subdev, video, s_stream, 0);
+	list_for_each_entry_safe(buf, tmp, &dmaq->list, list) {
+		list_del(&buf->list);
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
+	}
+
+	return ret;
+}
+
+static void ti_csi2rx_stop_streaming(struct vb2_queue *vq)
+{
+	struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vq);
+	struct ti_csi2rx_buffer *buf = NULL, *tmp;
+	int ret;
+
+	ret = v4l2_subdev_call(csi->subdev, video, s_stream, 0);
+	if (ret)
+		dev_err(csi->dev, "Failed to stop subdev stream\n");
+
+	writel(0, csi->shim + SHIM_CNTL);
+
+	ret = dmaengine_terminate_sync(csi->dma);
+	if (ret)
+		dev_err(csi->dev, "Failed to stop DMA\n");
+
+	writel(0, csi->shim + SHIM_DMACNTX);
+
+	list_for_each_entry_safe(buf, tmp, &csi->dmaq.list, list) {
+		list_del(&buf->list);
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+	}
+}
+
+static const struct vb2_ops csi_vb2_qops = {
+	.queue_setup = ti_csi2rx_queue_setup,
+	.buf_prepare = ti_csi2rx_buffer_prepare,
+	.buf_queue = ti_csi2rx_buffer_queue,
+	.start_streaming = ti_csi2rx_start_streaming,
+	.stop_streaming = ti_csi2rx_stop_streaming,
+	.wait_prepare = vb2_ops_wait_prepare,
+	.wait_finish = vb2_ops_wait_finish,
+};
+
+static int ti_csi2rx_init_vb2q(struct ti_csi2rx_dev *csi)
+{
+	struct vb2_queue *q = &csi->vidq;
+	int ret;
+
+	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;
+	q->drv_priv = csi;
+	q->buf_struct_size = sizeof(struct ti_csi2rx_buffer);
+	q->ops = &csi_vb2_qops;
+	q->mem_ops = &vb2_dma_contig_memops;
+	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	q->dev = csi->dma->device->dev;
+	q->lock = &csi->mutex;
+
+	ret = vb2_queue_init(q);
+	if (ret)
+		return ret;
+
+	csi->vdev.queue = q;
+
+	return 0;
+}
+
+static int ti_csi2rx_init_dma(struct ti_csi2rx_dev *csi)
+{
+	struct dma_slave_config cfg;
+	int ret;
+
+	INIT_LIST_HEAD(&csi->dmaq.list);
+
+	csi->dma = NULL;
+
+	csi->dma = dma_request_chan(csi->dev, "rx0");
+	if (IS_ERR(csi->dma))
+		return PTR_ERR(csi->dma);
+
+	memset(&cfg, 0, sizeof(cfg));
+
+	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_16_BYTES;
+	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_16_BYTES;
+
+	ret = dmaengine_slave_config(csi->dma, &cfg);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int ti_csi2rx_media_init(struct ti_csi2rx_dev *csi)
+{
+	struct media_device *mdev = &csi->mdev;
+
+	mdev->dev = csi->dev;
+	strscpy(mdev->model, "TI-CSI2RX", sizeof(mdev->model));
+	snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
+		 dev_name(mdev->dev));
+
+	media_device_init(mdev);
+
+	return 0;
+}
+
+static int ti_csi2rx_probe(struct platform_device *pdev)
+{
+	struct ti_csi2rx_dev *csi;
+	struct resource *res;
+	int ret;
+
+	csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
+	if (!csi)
+		return -ENOMEM;
+
+	csi->dev = &pdev->dev;
+	platform_set_drvdata(pdev, csi);
+
+	mutex_init(&csi->mutex);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	csi->shim = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(csi->shim))
+		return PTR_ERR(csi->shim);
+
+	ret = ti_csi2rx_media_init(csi);
+	if (ret)
+		return ret;
+
+	csi->v4l2_dev.mdev = &csi->mdev;
+
+	ret = v4l2_device_register(csi->dev, &csi->v4l2_dev);
+	if (ret)
+		return ret;
+
+	ret = ti_csi2rx_init_dma(csi);
+	if (ret)
+		return ret;
+
+	ret = ti_csi2rx_init_vb2q(csi);
+	if (ret)
+		return ret;
+
+	ret = ti_csi2rx_init_subdev(csi);
+	if (ret)
+		return ret;
+
+	ret = of_platform_populate(csi->dev->of_node, NULL, NULL, csi->dev);
+	if (ret) {
+		dev_err(csi->dev, "Failed to create children: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ti_csi2rx_remove(struct platform_device *pdev)
+{
+	struct ti_csi2rx_dev *csi = platform_get_drvdata(pdev);
+
+	if (vb2_is_busy(&csi->vidq))
+		return -EBUSY;
+
+	vb2_queue_release(&csi->vidq);
+	v4l2_async_notifier_unregister(&csi->notifier);
+	v4l2_async_notifier_cleanup(&csi->notifier);
+	v4l2_device_unregister(&csi->v4l2_dev);
+	video_unregister_device(&csi->vdev);
+	dma_release_channel(csi->dma);
+
+	return 0;
+}
+
+static const struct of_device_id ti_csi2rx_of_match[] = {
+	{
+		.compatible = "ti,csi2rx",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ti_csi2rx_of_match);
+
+static struct platform_driver ti_csi2rx_pdrv = {
+	.probe = ti_csi2rx_probe,
+	.remove = ti_csi2rx_remove,
+	.driver = {
+		.name = TI_CSI2RX_MODULE_NAME,
+		.of_match_table = ti_csi2rx_of_match,
+	},
+};
+
+module_platform_driver(ti_csi2rx_pdrv);
+
+MODULE_DESCRIPTION("TI CSI2 RX Driver");
+MODULE_AUTHOR("Pratyush Yadav <p.yadav@ti.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("1.0");