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Message-ID: <aWpil6jI1Ad0DcEI@lizhi-Precision-Tower-5810>
Date: Fri, 16 Jan 2026 11:08:55 -0500
From: Frank Li <Frank.li@....com>
To: Michael Riesch <michael.riesch@...labora.com>
Cc: Chaoyi Chen <chaoyi.chen@...k-chips.com>,
Kever Yang <kever.yang@...k-chips.com>,
Mehdi Djait <mehdi.djait@...ux.intel.com>,
Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Hans Verkuil <hverkuil@...nel.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Heiko Stuebner <heiko@...ech.de>,
Philipp Zabel <p.zabel@...gutronix.de>,
Sebastian Reichel <sebastian.reichel@...labora.com>,
Nicolas Dufresne <nicolas.dufresne@...labora.com>,
Collabora Kernel Team <kernel@...labora.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] media: synopsys: add driver for the designware
mipi csi-2 receiver
On Fri, Jan 16, 2026 at 02:02:47PM +0100, Michael Riesch wrote:
> The Synopsys DesignWare MIPI CSI-2 Receiver is a CSI-2 bridge with
> one input port and one output port. It receives the data with the
> help of an external MIPI PHY (C-PHY or D-PHY) and passes it to e.g.,
> the Rockchip Video Capture (VICAP) block on recent Rockchip SoCs.
>
> Add a V4L2 subdevice driver for this unit.
>
> Signed-off-by: Michael Riesch <michael.riesch@...fvision.net>
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Reviewed-by: Mehdi Djait <mehdi.djait@...ux.intel.com>
> Signed-off-by: Michael Riesch <michael.riesch@...labora.com>
> ---
...
> +
> +static inline struct dw_mipi_csi2_device *to_csi2(struct v4l2_subdev *sd)
> +{
> + return container_of(sd, struct dw_mipi_csi2_device, sd);
> +}
> +
> +static inline __maybe_unused void
why need '__maybe_unused', needn't inline. compiler can auto decide and
report unused function if no 'inline'.
> +dw_mipi_csi2_write(struct dw_mipi_csi2_device *csi2, unsigned int addr, u32 val)
> +{
> + writel(val, csi2->base_addr + addr);
> +}
> +
> +static inline __maybe_unused u32
> +dw_mipi_csi2_read(struct dw_mipi_csi2_device *csi2, unsigned int addr)
> +{
> + return readl(csi2->base_addr + addr);
> +}
> +
> +static const struct dw_mipi_csi2_format *
> +dw_mipi_csi2_find_format(struct dw_mipi_csi2_device *csi2, u32 mbus_code)
> +{
> + WARN_ON(csi2->formats_num == 0);
> +
> + for (unsigned int i = 0; i < csi2->formats_num; i++) {
> + const struct dw_mipi_csi2_format *format = &csi2->formats[i];
> +
> + if (format->code == mbus_code)
> + return format;
> + }
> +
> + return NULL;
> +}
> +
> +static int dw_mipi_csi2_start(struct dw_mipi_csi2_device *csi2)
> +{
> + struct media_pad *source_pad;
> + union phy_configure_opts opts;
> + s64 link_freq;
> + u32 control = 0;
> + u32 lanes = csi2->lanes_num;
> + int ret;
try keep reverise christmas tree order.
> +
> + if (lanes < 1 || lanes > 4)
> + return -EINVAL;
> +
...
> +
> +static int dw_mipi_csi2_register_notifier(struct dw_mipi_csi2_device *csi2)
> +{
> + struct v4l2_async_connection *asd;
> + struct v4l2_async_notifier *ntf = &csi2->notifier;
> + struct v4l2_fwnode_endpoint vep;
> + struct v4l2_subdev *sd = &csi2->sd;
> + struct device *dev = csi2->dev;
> + struct fwnode_handle *ep;
> + int ret;
> +
> + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
use struct fwnode_handle *ep __free(fwnode_handle) can simplify err
handler.
> + if (!ep)
> + return dev_err_probe(dev, -ENODEV, "failed to get endpoint\n");
> +
...
> +{
> + struct media_pad *pads = csi2->pads;
> + struct v4l2_subdev *sd = &csi2->sd;
> + int ret;
> +
> + ret = dw_mipi_csi2_register_notifier(csi2);
> + if (ret)
> + goto err;
> +
> + v4l2_subdev_init(sd, &dw_mipi_csi2_ops);
> + sd->dev = csi2->dev;
> + sd->entity.ops = &dw_mipi_csi2_media_ops;
> + sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> + sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
> + sd->internal_ops = &dw_mipi_csi2_internal_ops;
> + sd->owner = THIS_MODULE;
I remeber needn't set owner, v4l2_async_register_subdev() do it for you.
> + snprintf(sd->name, sizeof(sd->name), "dw-mipi-csi2 %s",
> + dev_name(csi2->dev));
> +
...
> +
> +static int dw_mipi_csi2_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct dw_mipi_csi2_device *csi2;
> + int ret;
> +
> + csi2 = devm_kzalloc(dev, sizeof(*csi2), GFP_KERNEL);
> + if (!csi2)
> + return -ENOMEM;
> + csi2->dev = dev;
> + dev_set_drvdata(dev, csi2);
> +
> + csi2->base_addr = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(csi2->base_addr))
> + return PTR_ERR(csi2->base_addr);
> +
> + ret = devm_clk_bulk_get_all(dev, &csi2->clks);
> + if (ret != DW_MIPI_CSI2_CLKS_MAX)
> + return dev_err_probe(dev, -ENODEV, "failed to get clocks\n");
> + csi2->clks_num = ret;
> +
> + csi2->phy = devm_phy_get(dev, NULL);
> + if (IS_ERR(csi2->phy))
> + return dev_err_probe(dev, PTR_ERR(csi2->phy),
> + "failed to get MIPI CSI-2 PHY\n");
> +
> + csi2->reset = devm_reset_control_get_exclusive(dev, NULL);
> + if (IS_ERR(csi2->reset))
> + return dev_err_probe(dev, PTR_ERR(csi2->reset),
> + "failed to get reset\n");
> +
> + csi2->formats = formats;
> + csi2->formats_num = ARRAY_SIZE(formats);
> +
> + pm_runtime_enable(dev);
devm_pm_runtime_enable() will simple error handle.
> +
> + ret = phy_init(csi2->phy);
> + if (ret) {
> + ret = dev_err_probe(dev, ret,
> + "failed to initialize MIPI CSI-2 PHY\n");
> + goto err_pm_runtime_disable;
> + }
> +
...
> +
> +static int dw_mipi_csi2_runtime_resume(struct device *dev)
> +{
> + struct dw_mipi_csi2_device *csi2 = dev_get_drvdata(dev);
> + int ret;
> +
> + reset_control_assert(csi2->reset);
> + udelay(5);
Now prefer use fsleep(), which auto choose difference sleep function
according to delay number.
> + reset_control_deassert(csi2->reset);
> +
> + ret = clk_bulk_prepare_enable(csi2->clks_num, csi2->clks);
> + if (ret) {
> + dev_err(dev, "failed to enable clocks\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static DEFINE_RUNTIME_DEV_PM_OPS(dw_mipi_csi2_pm_ops,
> + dw_mipi_csi2_runtime_suspend,
> + dw_mipi_csi2_runtime_resume, NULL);
> +
> +static struct platform_driver dw_mipi_csi2_drv = {
> + .driver = {
> + .name = "dw-mipi-csi2",
> + .of_match_table = dw_mipi_csi2_of_match,
> + .pm = &dw_mipi_csi2_pm_ops,
pm_ptr( &dw_mipi_csi2_pm_ops)
Frank
> + },
> + .probe = dw_mipi_csi2_probe,
> + .remove = dw_mipi_csi2_remove,
> +};
> +module_platform_driver(dw_mipi_csi2_drv);
> +
> +MODULE_DESCRIPTION("Synopsys DesignWare MIPI CSI-2 Receiver platform driver");
> +MODULE_LICENSE("GPL");
>
> --
> 2.39.5
>
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