On 11/09/2016 04:44 PM, Ramesh Shanmugasundaram wrote:
> This patch adds Digital Radio Interface (DRIF) support to R-Car Gen3 SoCs.
> The driver exposes each instance of DRIF as a V4L2 SDR device. A DRIF
> device represents a channel and each channel can have one or two
> sub-channels respectively depending on the target board.
>
> DRIF supports only Rx functionality. It receives samples from a RF
> frontend tuner chip it is interfaced with. The combination of DRIF and the
> tuner device, which is registered as a sub-device, determines the receive
> sample rate and format.
>
> In order to be compliant as a V4L2 SDR device, DRIF needs to bind with
> the tuner device, which can be provided by a third party vendor. DRIF acts
> as a slave device and the tuner device acts as a master transmitting the
> samples. The driver allows asynchronous binding of a tuner device that
> is registered as a v4l2 sub-device. The driver can learn about the tuner
> it is interfaced with based on port endpoint properties of the device in
> device tree. The V4L2 SDR device inherits the controls exposed by the
> tuner device.
>
> The device can also be configured to use either one or both of the data
> pins at runtime based on the master (tuner) configuration.
>
> Signed-off-by: Ramesh Shanmugasundaram
> <ramesh.shanmugasunda...@bp.renesas.com>
> ---
> .../devicetree/bindings/media/renesas,drif.txt | 136 ++
> drivers/media/platform/Kconfig | 25 +
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/rcar_drif.c | 1574
> ++++++++++++++++++++
> 4 files changed, 1736 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/renesas,drif.txt
> create mode 100644 drivers/media/platform/rcar_drif.c
>
> diff --git a/Documentation/devicetree/bindings/media/renesas,drif.txt
> b/Documentation/devicetree/bindings/media/renesas,drif.txt
> new file mode 100644
> index 0000000..d65368a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/renesas,drif.txt
> @@ -0,0 +1,136 @@
> +Renesas R-Car Gen3 Digital Radio Interface controller (DRIF)
> +------------------------------------------------------------
> +
> +R-Car Gen3 DRIF is a serial slave device. It interfaces with a master
> +device as shown below
> +
> ++---------------------+ +---------------------+
> +| |-----SCK------->|CLK |
> +| Master |-----SS-------->|SYNC DRIFn (slave) |
> +| |-----SD0------->|D0 |
> +| |-----SD1------->|D1 |
> ++---------------------+ +---------------------+
> +
> +Each DRIF channel (drifn) consists of two sub-channels (drifn0 & drifn1).
> +The sub-channels are like two individual channels in itself that share the
> +common CLK & SYNC. Each sub-channel has it's own dedicated resources like
> +irq, dma channels, address space & clock.
> +
> +The device tree model represents the channel and each of it's sub-channel
> +as a separate node. The parent channel ties the sub-channels together with
> +their phandles.
> +
> +Required properties of a sub-channel:
> +-------------------------------------
> +- compatible: "renesas,r8a7795-drif" if DRIF controller is a part of R8A7795
> SoC.
> + "renesas,rcar-gen3-drif" for a generic R-Car Gen3 compatible
> device.
> + When compatible with the generic version, nodes must list the
> + SoC-specific version corresponding to the platform first
> + followed by the generic version.
> +- reg: offset and length of that sub-channel.
> +- interrupts: associated with that sub-channel.
> +- clocks: phandle and clock specifier of that sub-channel.
> +- clock-names: clock input name string: "fck".
> +- dmas: phandles to the DMA channel of that sub-channel.
> +- dma-names: names of the DMA channel: "rx".
> +
> +Optional properties of a sub-channel:
> +-------------------------------------
> +- power-domains: phandle to the respective power domain.
> +
> +Required properties of a channel:
> +---------------------------------
> +- pinctrl-0: pin control group to be used for this channel.
> +- pinctrl-names: must be "default".
> +- sub-channels : phandles to the two sub-channels.
> +
> +Optional properties of a channel:
> +---------------------------------
> +- port: child port node of a channel that defines the local and remote
> + endpoints. The remote endpoint is assumed to be a tuner subdevice
> + endpoint.
> +- renesas,syncmd : sync mode
> + 0 (Frame start sync pulse mode. 1-bit width pulse
> + indicates start of a frame)
> + 1 (L/R sync or I2S mode) (default)
> +- renesas,lsb-first : empty property indicates lsb bit is received first.
> + When not defined msb bit is received first (default)
> +- renesas,syncac-pol-high : empty property indicates sync signal polarity.
> + When defined, active high or high->low sync signal.
> + When not defined, active low or low->high sync signal
> + (default)
> +- renesas,dtdl : delay between sync signal and start of reception.
> + Must contain one of the following values:
> + 0 (no bit delay)
> + 50 (0.5-clock-cycle delay)
> + 100 (1-clock-cycle delay) (default)
> + 150 (1.5-clock-cycle delay)
> + 200 (2-clock-cycle delay)
> +- renesas,syncdl : delay between end of reception and sync signal edge.
> + Must contain one of the following values:
> + 0 (no bit delay) (default)
> + 50 (0.5-clock-cycle delay)
> + 100 (1-clock-cycle delay)
> + 150 (1.5-clock-cycle delay)
> + 200 (2-clock-cycle delay)
> + 300 (3-clock-cycle delay)
> +
> +Example
> +--------
> +
> +SoC common dtsi file
> +
> + drif00: rif@e6f40000 {
> + compatible = "renesas,r8a7795-drif",
> + "renesas,rcar-gen3-drif";
> + reg = <0 0xe6f40000 0 0x64>;
> + interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&cpg CPG_MOD 515>;
> + clock-names = "fck";
> + dmas = <&dmac1 0x20>, <&dmac2 0x20>;
> + dma-names = "rx", "rx";
> + power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> + status = "disabled";
> + };
> +
> + drif01: rif@e6f50000 {
> + compatible = "renesas,r8a7795-drif",
> + "renesas,rcar-gen3-drif";
> + reg = <0 0xe6f50000 0 0x64>;
> + interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&cpg CPG_MOD 514>;
> + clock-names = "fck";
> + dmas = <&dmac1 0x22>, <&dmac2 0x22>;
> + dma-names = "rx", "rx";
> + power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> + status = "disabled";
> + };
> +
> + drif0: rif@0 {
> + compatible = "renesas,r8a7795-drif",
> + "renesas,rcar-gen3-drif";
> + sub-channels = <&drif00>, <&drif01>;
> + status = "disabled";
> + };
> +
> +Board specific dts file
> +
> +&drif00 {
> + status = "okay";
> +};
> +
> +&drif01 {
> + status = "okay";
> +};
> +
> +&drif0 {
> + pinctrl-0 = <&drif0_pins>;
> + pinctrl-names = "default";
> + renesas,syncac-pol-high;
> + status = "okay";
> + port {
> + drif0_ep: endpoint {
> + remote-endpoint = <&tuner_subdev_ep>;
> + };
> + };
> +};
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 754edbf1..0ae83a8 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -393,3 +393,28 @@ menuconfig DVB_PLATFORM_DRIVERS
> if DVB_PLATFORM_DRIVERS
> source "drivers/media/platform/sti/c8sectpfe/Kconfig"
> endif #DVB_PLATFORM_DRIVERS
> +
> +menuconfig SDR_PLATFORM_DRIVERS
> + bool "SDR platform devices"
> + depends on MEDIA_SDR_SUPPORT
> + default n
> + ---help---
> + Say Y here to enable support for platform-specific SDR Drivers.
> +
> +if SDR_PLATFORM_DRIVERS
> +
> +config VIDEO_RCAR_DRIF
> + tristate "Renesas Digitial Radio Interface (DRIF)"
> + depends on VIDEO_V4L2 && HAS_DMA
> + depends on ARCH_RENESAS
> + select VIDEOBUF2_VMALLOC
> + ---help---
> + Say Y if you want to enable R-Car Gen3 DRIF support. DRIF is Digital
> + Radio Interface that interfaces with an RF front end chip. It is a
> + receiver of digital data which uses DMA to transfer received data to
> + a configured location for an application to use.
> +
> + To compile this driver as a module, choose M here; the module
> + will be called rcar_drif.
> +
> +endif # SDR_PLATFORM_DRIVERS
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index f842933..49ce238 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -49,6 +49,7 @@ obj-$(CONFIG_SOC_CAMERA) += soc_camera/
>
> obj-$(CONFIG_VIDEO_RENESAS_FCP) += rcar-fcp.o
> obj-$(CONFIG_VIDEO_RENESAS_JPU) += rcar_jpu.o
> +obj-$(CONFIG_VIDEO_RCAR_DRIF) += rcar_drif.o
> obj-$(CONFIG_VIDEO_RENESAS_VSP1) += vsp1/
>
> obj-y += omap/
> diff --git a/drivers/media/platform/rcar_drif.c
> b/drivers/media/platform/rcar_drif.c
> new file mode 100644
> index 0000000..34dc282
> --- /dev/null
> +++ b/drivers/media/platform/rcar_drif.c
> @@ -0,0 +1,1574 @@
<snip>
+#define for_each_rcar_drif_subdev(sd, tmp, ch) \
+ list_for_each_entry_safe(sd, tmp, &ch->v4l2_dev.subdevs, list)
+
Please don't use this. media/v4l2-device.h has a bunch of similar functions
for this. Use those instead.
<snip>
> +static int rcar_drif_querycap(struct file *file, void *fh,
> + struct v4l2_capability *cap)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> +
> + strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
> + strlcpy(cap->card, ch->vdev.name, sizeof(cap->card));
> + cap->device_caps = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_TUNER |
> + V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;
> + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
Set device_caps in struct video_device and drop it here.
The core will fill in cap->device_caps and cap->capabilities for you.
> + snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> + ch->vdev.name);
> + return 0;
> +}
> +
> +static int rcar_drif_set_default_format(struct rcar_drif_chan *ch)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < NUM_FORMATS; i++) {
> + /* Find any matching fmt and set it as default */
> + if (ch->num_hw_schans == formats[i].num_schans) {
> + ch->fmt_idx = i;
> + ch->cur_schans_mask = ch->hw_schans_mask;
> + ch->num_cur_schans = ch->num_hw_schans;
> + dev_dbg(ch->dev, "default fmt[%u]: mask %lu num %u\n",
> + i, ch->cur_schans_mask, ch->num_cur_schans);
> + return 0;
> + }
> + }
> + dev_err(ch->dev, "no matching sdr fmt found\n");
> + return -EINVAL;
> +}
> +
> +static int rcar_drif_enum_fmt_sdr_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + if (f->index >= NUM_FORMATS)
> + return -EINVAL;
> +
> + strlcpy(f->description, formats[f->index].name, sizeof(f->description));
Drop this. The core fills that in for you.
> + f->pixelformat = formats[f->index].pixelformat;
> + return 0;
> +}
> +
> +static int rcar_drif_g_fmt_sdr_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> +
> + f->fmt.sdr.pixelformat = formats[ch->fmt_idx].pixelformat;
> + f->fmt.sdr.buffersize = formats[ch->fmt_idx].buffersize;
> + memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
> + return 0;
> +}
> +
> +static int rcar_drif_s_fmt_sdr_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> + struct vb2_queue *q = &ch->vb_queue;
> + unsigned int i;
> +
> + if (vb2_is_busy(q))
> + return -EBUSY;
> +
> + memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
> + for (i = 0; i < NUM_FORMATS; i++) {
> + if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
> + ch->fmt_idx = i;
> + f->fmt.sdr.buffersize = formats[i].buffersize;
> +
> + /*
> + * If a format demands one sub-channel only out of two
> + * enabled sub-channels then pick the 0th sub-channel
> + */
> + if (formats[i].num_schans < ch->num_hw_schans) {
> + ch->cur_schans_mask = BIT(0); /* Enable D0 */
> + ch->num_cur_schans = formats[i].num_schans;
> + } else {
> + ch->cur_schans_mask = ch->hw_schans_mask;
> + ch->num_cur_schans = ch->num_hw_schans;
> + }
> +
> + rdrif_dbg(1, ch, "cur: idx %u mask %lu num %u\n",
> + i, ch->cur_schans_mask, ch->num_cur_schans);
> + return 0;
> + }
> + }
> +
> + if (rcar_drif_set_default_format(ch))
> + return -EINVAL;
> +
> + f->fmt.sdr.pixelformat = formats[ch->fmt_idx].pixelformat;
> + f->fmt.sdr.buffersize = formats[ch->fmt_idx].buffersize;
> + return 0;
> +}
> +
> +static int rcar_drif_try_fmt_sdr_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> + unsigned int i;
> +
> + memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
> + for (i = 0; i < NUM_FORMATS; i++) {
> + if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
> + f->fmt.sdr.buffersize = formats[i].buffersize;
> + return 0;
> + }
> + }
> +
> + f->fmt.sdr.pixelformat = formats[ch->fmt_idx].pixelformat;
> + f->fmt.sdr.buffersize = formats[ch->fmt_idx].buffersize;
> + return 0;
> +}
> +
> +/* Tuner subdev ioctls */
> +static int rcar_drif_enum_freq_bands(struct file *file, void *priv,
> + struct v4l2_frequency_band *band)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> + struct v4l2_subdev *sd, *tmp;
> + int ret = 0;
> +
> + for_each_rcar_drif_subdev(sd, tmp, ch) {
> + ret = v4l2_subdev_call(sd, tuner, enum_freq_bands, band);
> + if (ret)
> + break;
> + }
> + return ret;
> +}
> +
> +static int rcar_drif_g_frequency(struct file *file, void *priv,
> + struct v4l2_frequency *f)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> + struct v4l2_subdev *sd, *tmp;
> + int ret = 0;
> +
> + for_each_rcar_drif_subdev(sd, tmp, ch) {
> + ret = v4l2_subdev_call(sd, tuner, g_frequency, f);
> + if (ret)
> + break;
> + }
> + return ret;
> +}
> +
> +static int rcar_drif_s_frequency(struct file *file, void *priv,
> + const struct v4l2_frequency *f)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> + struct v4l2_subdev *sd, *tmp;
> + int ret = 0;
> +
> + for_each_rcar_drif_subdev(sd, tmp, ch) {
> + ret = v4l2_subdev_call(sd, tuner, s_frequency, f);
> + if (ret)
> + break;
> + }
> + return ret;
> +}
> +
> +static int rcar_drif_g_tuner(struct file *file, void *priv,
> + struct v4l2_tuner *vt)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> + struct v4l2_subdev *sd, *tmp;
> + int ret = 0;
> +
> + for_each_rcar_drif_subdev(sd, tmp, ch) {
> + ret = v4l2_subdev_call(sd, tuner, g_tuner, vt);
> + if (ret)
> + break;
> + }
> + return ret;
> +}
> +
> +static int rcar_drif_s_tuner(struct file *file, void *priv,
> + const struct v4l2_tuner *vt)
> +{
> + struct rcar_drif_chan *ch = video_drvdata(file);
> + struct v4l2_subdev *sd, *tmp;
> + int ret = 0;
> +
> + for_each_rcar_drif_subdev(sd, tmp, ch) {
> + ret = v4l2_subdev_call(sd, tuner, s_tuner, vt);
> + if (ret)
> + break;
> + }
> + return ret;
> +}
> +
> +static const struct v4l2_ioctl_ops rcar_drif_ioctl_ops = {
> + .vidioc_querycap = rcar_drif_querycap,
> +
> + .vidioc_enum_fmt_sdr_cap = rcar_drif_enum_fmt_sdr_cap,
> + .vidioc_g_fmt_sdr_cap = rcar_drif_g_fmt_sdr_cap,
> + .vidioc_s_fmt_sdr_cap = rcar_drif_s_fmt_sdr_cap,
> + .vidioc_try_fmt_sdr_cap = rcar_drif_try_fmt_sdr_cap,
> +
> + .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_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_s_frequency = rcar_drif_s_frequency,
> + .vidioc_g_frequency = rcar_drif_g_frequency,
> + .vidioc_s_tuner = rcar_drif_s_tuner,
> + .vidioc_g_tuner = rcar_drif_g_tuner,
> + .vidioc_enum_freq_bands = rcar_drif_enum_freq_bands,
> + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> + .vidioc_log_status = v4l2_ctrl_log_status,
> +};
> +
> +static const struct v4l2_file_operations rcar_drif_fops = {
> + .owner = THIS_MODULE,
> + .open = v4l2_fh_open,
> + .release = vb2_fop_release,
> + .read = vb2_fop_read,
> + .poll = vb2_fop_poll,
> + .mmap = vb2_fop_mmap,
> + .unlocked_ioctl = video_ioctl2,
> +};
> +
> +static struct video_device rcar_drif_vdev = {
> + .name = "R-Car DRIF",
> + .release = video_device_release_empty,
> + .fops = &rcar_drif_fops,
> + .ioctl_ops = &rcar_drif_ioctl_ops,
> +};
> +
> +static int rcar_drif_notify_bound(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd)
> +{
> + struct rcar_drif_chan *ch =
> + container_of(notifier, struct rcar_drif_chan, notifier);
> +
> + /* Nothing to do at this point */
> + rdrif_dbg(2, ch, "bound asd: %s\n", asd->match.of.node->name);
> + return 0;
> +}
> +
> +/* Sub-device registered notification callback */
> +static int rcar_drif_notify_complete(struct v4l2_async_notifier *notifier)
> +{
> + struct rcar_drif_chan *ch =
> + container_of(notifier, struct rcar_drif_chan, notifier);
> + struct v4l2_subdev *sd, *tmp;
> + int ret;
> +
> + v4l2_ctrl_handler_init(&ch->ctrl_hdl, 10);
> + ch->v4l2_dev.ctrl_handler = &ch->ctrl_hdl;
> +
> + ret = v4l2_device_register_subdev_nodes(&ch->v4l2_dev);
> + if (ret) {
> + rdrif_err(ch, "failed register subdev nodes ret %d\n", ret);
> + return ret;
> + }
> +
> + for_each_rcar_drif_subdev(sd, tmp, ch) {
> + ret = v4l2_ctrl_add_handler(ch->v4l2_dev.ctrl_handler,
> + sd->ctrl_handler, NULL);
> + if (ret) {
> + rdrif_err(ch, "failed ctrl add hdlr ret %d\n", ret);
> + return ret;
> + }
> + }
> + rdrif_dbg(2, ch, "notify complete\n");
> + return 0;
> +}
> +
> +/* Parse sub-devs (tuner) to find a matching device */
> +static int rcar_drif_parse_subdevs(struct device *dev,
> + struct v4l2_async_notifier *notifier)
> +{
> + struct device_node *node = NULL;
> +
> + notifier->subdevs = devm_kzalloc(dev, sizeof(*notifier->subdevs),
> + GFP_KERNEL);
> + if (!notifier->subdevs)
> + return -ENOMEM;
> +
> + node = of_graph_get_next_endpoint(dev->of_node, node);
Do:
if (!node)
return 0;
And the remainder can be shifted one tab to the left.
> + if (node) {
> + struct rcar_drif_async_subdev *rsd;
> +
> + rsd = devm_kzalloc(dev, sizeof(*rsd), GFP_KERNEL);
> + if (!rsd) {
> + of_node_put(node);
> + return -ENOMEM;
> + }
> +
> + notifier->subdevs[notifier->num_subdevs] = &rsd->asd;
> + rsd->asd.match.of.node = of_graph_get_remote_port_parent(node);
> + of_node_put(node);
> + if (!rsd->asd.match.of.node) {
> + dev_warn(dev, "bad remote port parent\n");
> + return -EINVAL;
> + }
> +
> + rsd->asd.match_type = V4L2_ASYNC_MATCH_OF;
> + notifier->num_subdevs++;
> + }
> + return 0;
> +}
> +
> +/* SIRMDR1 configuration */
> +static int rcar_drif_validate_syncmd(struct rcar_drif_chan *ch, u32 val)
> +{
> + if (val > 1) {
> + dev_err(ch->dev, "invalid syncmd %u using L/R mode\n", val);
> + return -EINVAL;
> + }
> +
> + ch->mdr1 &= ~(3 << 28); /* Clear current settings */
> + if (val == 0)
> + ch->mdr1 |= RCAR_DRIF_SIRMDR1_SYNCMD_FRAME;
> + else
> + ch->mdr1 |= RCAR_DRIF_SIRMDR1_SYNCMD_LR;
> + return 0;
> +}
> +
> +/* Get the dtdl or syncdl bits as in MSIOF */
> +static u32 rcar_drif_get_dtdl_or_syncdl_bits(u32 dtdl_or_syncdl)
> +{
> + /*
> + * DTDL/SYNCDL bit : dtdl/syncdl
> + * b'000 : 0
> + * b'001 : 100
> + * b'010 : 200
> + * b'011 (SYNCDL only) : 300
> + * b'101 : 50
> + * b'110 : 150
> + */
> + if (dtdl_or_syncdl % 100)
> + return dtdl_or_syncdl / 100 + 5;
> + else
Line can be dropped.
> + return dtdl_or_syncdl / 100;
> +}
> +
> +static int rcar_drif_validate_dtdl_syncdl(struct rcar_drif_chan *ch)
> +{
> + struct device_node *np = ch->dev->of_node;
> + u32 dtdl = 100, syncdl = 0;
> +
> + ch->mdr1 |= RCAR_DRIF_SIRMDR1_DTDL_1 | RCAR_DRIF_SIRMDR1_SYNCDL_0;
> + of_property_read_u32(np, "renesas,dtdl", &dtdl);
> + of_property_read_u32(np, "renesas,syncdl", &syncdl);
> +
> + /* Sanity checks */
> + if (dtdl > 200 || syncdl > 300) {
> + dev_err(ch->dev, "invalid dtdl %u/syncdl %u\n", dtdl, syncdl);
> + return -EINVAL;
> + }
> + if ((dtdl + syncdl) % 100) {
> + dev_err(ch->dev, "sum of dtdl %u & syncdl %u not OK\n",
> + dtdl, syncdl);
> + return -EINVAL;
> + }
> + ch->mdr1 &= ~(7 << 20) & ~(7 << 16); /* Clear current settings */
> + ch->mdr1 |= rcar_drif_get_dtdl_or_syncdl_bits(dtdl) << 20;
> + ch->mdr1 |= rcar_drif_get_dtdl_or_syncdl_bits(syncdl) << 16;
> + return 0;
> +}
> +
> +static int rcar_drif_parse_properties(struct rcar_drif_chan *ch)
> +{
> + struct device_node *np = ch->dev->of_node;
> + u32 syncmd;
> + int ret;
> +
> + /* Set the defaults and check for overrides */
> + ch->mdr1 = RCAR_DRIF_SIRMDR1_SYNCMD_LR;
> + if (!of_property_read_u32(np, "renesas,syncmd", &syncmd)) {
> + ret = rcar_drif_validate_syncmd(ch, syncmd);
> + if (ret)
> + return ret;
> + }
> +
> + if (of_find_property(np, "renesas,lsb-first", NULL))
> + ch->mdr1 |= RCAR_DRIF_SIRMDR1_LSB_FIRST;
> + else
> + ch->mdr1 |= RCAR_DRIF_SIRMDR1_MSB_FIRST;
> +
> + if (of_find_property(np, "renesas,syncac-pol-high", NULL))
> + ch->mdr1 |= RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH;
> + else
> + ch->mdr1 |= RCAR_DRIF_SIRMDR1_SYNCAC_POL_LOW;
> +
> + return rcar_drif_validate_dtdl_syncdl(ch);
> +}
> +
> +static u32 rcar_drif_enum_sub_channels(struct platform_device *pdev,
> + struct platform_device *s_pdev[])
> +{
> + struct device_node *s_np;
> + u32 hw_schans_mask = 0;
> + unsigned int i;
> +
> + for (i = 0; i < RCAR_DRIF_MAX_SUBCHANS; i++) {
> + s_np = of_parse_phandle(pdev->dev.of_node, "sub-channels", i);
> + if (s_np && of_device_is_available(s_np)) {
> + s_pdev[i] = of_find_device_by_node(s_np);
> + if (s_pdev[i]) {
> + hw_schans_mask |= BIT(i);
> + dev_dbg(&s_pdev[i]->dev, "schan%u ok\n", i);
> + }
> + }
> + }
> + return hw_schans_mask;
> +}
> +
> +static int rcar_drif_probe(struct platform_device *pdev)
> +{
> + struct platform_device *s_pdev[RCAR_DRIF_MAX_SUBCHANS];
> + unsigned long hw_schans_mask;
> + struct rcar_drif_chan *ch;
> + unsigned int i;
> + int ret;
> +
> + /*
> + * Sub-channel resources are managed by the parent channel instance.
> + * The sub-channel instance helps only in registering with power domain
> + * to aid in run-time pm support
> + */
> + if (!of_find_property(pdev->dev.of_node, "sub-channels", NULL))
> + return 0;
> +
> + /* Parent channel instance */
> + hw_schans_mask = rcar_drif_enum_sub_channels(pdev, s_pdev);
> + if (!hw_schans_mask) {
> + dev_err(&pdev->dev, "no sub-channels enabled\n");
> + return -ENODEV;
> + }
> +
> +
> + /* Reserve memory for driver structure */
> + ch = devm_kzalloc(&pdev->dev, sizeof(*ch), GFP_KERNEL);
> + if (!ch) {
> + ret = PTR_ERR(ch);
> + dev_err(&pdev->dev, "failed alloc drif context\n");
> + return ret;
> + }
> + ch->dev = &pdev->dev;
> +
> + /* Parse device tree optional properties */
> + ret = rcar_drif_parse_properties(ch);
> + if (ret)
> + return ret;
> +
> + dev_dbg(ch->dev, "parsed mdr1 0x%08x\n", ch->mdr1);
> +
> + /* Setup enabled sub-channels */
> + for_each_rcar_drif_subchannel(i, &hw_schans_mask) {
> + struct clk *clkp;
> + struct resource *res;
> + void __iomem *base;
> +
> + /* Peripheral clock */
> + clkp = devm_clk_get(&s_pdev[i]->dev, "fck");
> + if (IS_ERR(clkp)) {
> + ret = PTR_ERR(clkp);
> + dev_err(&s_pdev[i]->dev, "clk get failed (%d)\n", ret);
> + return ret;
> + }
> +
> + /* Register map */
> + res = platform_get_resource(s_pdev[i], IORESOURCE_MEM, 0);
> + base = devm_ioremap_resource(&s_pdev[i]->dev, res);
> + if (IS_ERR(base)) {
> + ret = PTR_ERR(base);
> + dev_err(&s_pdev[i]->dev, "ioremap failed (%d)\n", ret);
> + return ret;
> + }
> +
> + /* Reserve memory for enabled sub-channel */
> + ch->sch[i] = devm_kzalloc(&pdev->dev, sizeof(*ch->sch[i]),
> + GFP_KERNEL);
> + if (!ch->sch[i]) {
> + ret = PTR_ERR(ch);
> + dev_err(&s_pdev[i]->dev, "failed alloc sub-channel\n");
> + return ret;
> + }
> + ch->sch[i]->pdev = s_pdev[i];
> + ch->sch[i]->clkp = clkp;
> + ch->sch[i]->base = base;
> + ch->sch[i]->num = i;
> + ch->sch[i]->start = res->start;
> + ch->sch[i]->parent = ch;
> + ch->num_hw_schans++;
> + }
> + ch->hw_schans_mask = hw_schans_mask;
> +
> + /* Validate any supported format for enabled sub-channels */
> + ret = rcar_drif_set_default_format(ch);
> + if (ret)
> + return ret;
> +
> + /* Set defaults */
> + ch->num_hwbufs = RCAR_DRIF_DEFAULT_NUM_HWBUFS;
> + ch->hwbuf_size = RCAR_DRIF_DEFAULT_HWBUF_SIZE;
> +
> + mutex_init(&ch->v4l2_mutex);
> + mutex_init(&ch->vb_queue_mutex);
> + spin_lock_init(&ch->queued_bufs_lock);
> + INIT_LIST_HEAD(&ch->queued_bufs);
> +
> + /* Init videobuf2 queue structure */
> + ch->vb_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
> + ch->vb_queue.io_modes = VB2_READ | VB2_MMAP | VB2_DMABUF;
> + ch->vb_queue.drv_priv = ch;
> + ch->vb_queue.buf_struct_size = sizeof(struct rcar_drif_frame_buf);
> + ch->vb_queue.ops = &rcar_drif_vb2_ops;
> + ch->vb_queue.mem_ops = &vb2_vmalloc_memops;
> + ch->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> +
> + /* Init videobuf2 queue */
> + ret = vb2_queue_init(&ch->vb_queue);
> + if (ret) {
> + dev_err(ch->dev, "could not initialize vb2 queue\n");
> + return ret;
> + }
> +
> + /* Init video_device structure */
> + ch->vdev = rcar_drif_vdev;
Don't embed video_device, use video_device_alloc instead. A lot of drivers
embed this, but it turns out not to be a good idea. So new drivers should
use video_device_alloc.
> + ch->vdev.lock = &ch->v4l2_mutex;
> + ch->vdev.queue = &ch->vb_queue;
> + ch->vdev.queue->lock = &ch->vb_queue_mutex;
> + ch->vdev.ctrl_handler = &ch->ctrl_hdl;
> + video_set_drvdata(&ch->vdev, ch);
> +
> + /* Register the v4l2_device */
> + ret = v4l2_device_register(&pdev->dev, &ch->v4l2_dev);
> + if (ret) {
> + dev_err(ch->dev, "failed v4l2_device_register. ret %d\n", ret);
> + return ret;
> + }
> +
> + ch->vdev.v4l2_dev = &ch->v4l2_dev;
> +
> + /*
> + * Parse subdevs after v4l2_device_register because if the subdev
> + * is already probed, bound and complete will be called immediately
> + */
> + ret = rcar_drif_parse_subdevs(&pdev->dev, &ch->notifier);
> + if (ret)
> + goto err_unreg_v4l2;
> +
> + ch->notifier.bound = rcar_drif_notify_bound;
> + ch->notifier.complete = rcar_drif_notify_complete;
> +
> + /* Register notifier */
> + ret = v4l2_async_notifier_register(&ch->v4l2_dev, &ch->notifier);
> + if (ret < 0) {
> + dev_err(ch->dev, "notifier registration failed\n");
> + goto err_unreg_v4l2;
> + }
> +
> + /* Register SDR device */
> + ret = video_register_device(&ch->vdev, VFL_TYPE_SDR, -1);
> + if (ret) {
> + dev_err(ch->dev, "failed video_register_device. ret %d\n", ret);
> + goto err_unreg_notif;
> + }
> +
> + platform_set_drvdata(pdev, ch);
> + dev_notice(ch->dev, "probed\n");
> + return 0;
> +
> +err_unreg_notif:
> + v4l2_async_notifier_unregister(&ch->notifier);
> +err_unreg_v4l2:
> + v4l2_device_unregister(&ch->v4l2_dev);
> + return ret;
> +}
> +
> +static int rcar_drif_remove(struct platform_device *pdev)
> +{
> + struct rcar_drif_chan *ch = platform_get_drvdata(pdev);
> +
> + if (!ch)
> + return 0;
> +
> + /* Parent channel instance */
> + ch = platform_get_drvdata(pdev);
> + v4l2_ctrl_handler_free(ch->v4l2_dev.ctrl_handler);
> + v4l2_async_notifier_unregister(&ch->notifier);
> + v4l2_device_unregister(&ch->v4l2_dev);
> + video_unregister_device(&ch->vdev);
> + dev_notice(ch->dev, "removed\n");
> + return 0;
> +}
> +
> +static int __maybe_unused rcar_drif_suspend(struct device *dev)
> +{
> + return 0;
> +}
> +
> +static int __maybe_unused rcar_drif_resume(struct device *dev)
> +{
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(rcar_drif_pm_ops, rcar_drif_suspend,
> + rcar_drif_resume);
> +
> +static const struct of_device_id rcar_drif_of_table[] = {
> + { .compatible = "renesas,rcar-gen3-drif" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, rcar_drif_of_table);
> +
> +#define RCAR_DRIF_DRV_NAME "rcar_drif"
> +static struct platform_driver rcar_drif_driver = {
> + .driver = {
> + .name = RCAR_DRIF_DRV_NAME,
> + .of_match_table = of_match_ptr(rcar_drif_of_table),
> + .pm = &rcar_drif_pm_ops,
> + },
> + .probe = rcar_drif_probe,
> + .remove = rcar_drif_remove,
> +};
> +
> +module_platform_driver(rcar_drif_driver);
> +
> +MODULE_DESCRIPTION("Renesas R-Car Gen3 DRIF driver");
> +MODULE_ALIAS("platform:" RCAR_DRIF_DRV_NAME);
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("Ramesh Shanmugasundaram
> <ramesh.shanmugasunda...@bp.renesas.com>");
>
Regards,
Hans
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