Message-Id: <20210115200141.1397785-11-paul.kocialkowski@bootlin.com>
Date:   Fri, 15 Jan 2021 21:01:35 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-sunxi@...glegroups.com
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Jonathan Corbet <corbet@....net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kevin.lhopital@...mail.com,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Subject: [PATCH v5 10/16] media: sunxi: Add support for the A31 MIPI CSI-2 controller

The A31 MIPI CSI-2 controller is a dedicated MIPI CSI-2 bridge
found on Allwinner SoCs such as the A31 and V3/V3s.

It is a standalone block, connected to the CSI controller on one side
and to the MIPI D-PHY block on the other. It has a dedicated address
space, interrupt line and clock.

It is represented as a V4L2 subdev to the CSI controller and takes a
MIPI CSI-2 sensor as its own subdev, all using the fwnode graph and
media controller API.

Only 8-bit and 10-bit Bayer formats are currently supported.
While up to 4 internal channels to the CSI controller exist, only one
is currently supported by this implementation.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Acked-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/media/platform/sunxi/Kconfig          |   1 +
 drivers/media/platform/sunxi/Makefile         |   1 +
 .../platform/sunxi/sun6i-mipi-csi2/Kconfig    |  12 +
 .../platform/sunxi/sun6i-mipi-csi2/Makefile   |   4 +
 .../sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c   | 600 ++++++++++++++++++
 .../sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h   | 117 ++++
 6 files changed, 735 insertions(+)
 create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig
 create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile
 create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
 create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h

diff --git a/drivers/media/platform/sunxi/Kconfig b/drivers/media/platform/sunxi/Kconfig
index 7151cc249afa..9684e07454ad 100644
--- a/drivers/media/platform/sunxi/Kconfig
+++ b/drivers/media/platform/sunxi/Kconfig
@@ -2,3 +2,4 @@
 
 source "drivers/media/platform/sunxi/sun4i-csi/Kconfig"
 source "drivers/media/platform/sunxi/sun6i-csi/Kconfig"
+source "drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig"
diff --git a/drivers/media/platform/sunxi/Makefile b/drivers/media/platform/sunxi/Makefile
index fc537c9f5ca9..887a7cae8fca 100644
--- a/drivers/media/platform/sunxi/Makefile
+++ b/drivers/media/platform/sunxi/Makefile
@@ -2,5 +2,6 @@
 
 obj-y		+= sun4i-csi/
 obj-y		+= sun6i-csi/
+obj-y		+= sun6i-mipi-csi2/
 obj-y		+= sun8i-di/
 obj-y		+= sun8i-rotate/
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig
new file mode 100644
index 000000000000..47f1bb0779a8
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config VIDEO_SUN6I_MIPI_CSI2
+	tristate "Allwinner A31 MIPI CSI-2 Controller Driver"
+	depends on ARCH_SUNXI || COMPILE_TEST
+	depends on PM && COMMON_CLK && VIDEO_V4L2
+	select REGMAP_MMIO
+	select PHY_SUN6I_MIPI_DPHY
+	select MEDIA_CONTROLLER
+	select VIDEO_V4L2_SUBDEV_API
+	select V4L2_FWNODE
+	help
+	   Support for the Allwinner A31 MIPI CSI-2 Controller.
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile
new file mode 100644
index 000000000000..14e4e03818b5
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+sun6i-mipi-csi2-y += sun6i_mipi_csi2.o
+
+obj-$(CONFIG_VIDEO_SUN6I_MIPI_CSI2) += sun6i-mipi-csi2.o
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
new file mode 100644
index 000000000000..69186f0c35c2
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
@@ -0,0 +1,600 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+
+#include "sun6i_mipi_csi2.h"
+
+#define MODULE_NAME	"sun6i-mipi-csi2"
+
+static const u32 sun6i_mipi_csi2_mbus_codes[] = {
+	MEDIA_BUS_FMT_SBGGR8_1X8,
+	MEDIA_BUS_FMT_SGBRG8_1X8,
+	MEDIA_BUS_FMT_SGRBG8_1X8,
+	MEDIA_BUS_FMT_SRGGB8_1X8,
+	MEDIA_BUS_FMT_SBGGR10_1X10,
+	MEDIA_BUS_FMT_SGBRG10_1X10,
+	MEDIA_BUS_FMT_SGRBG10_1X10,
+	MEDIA_BUS_FMT_SRGGB10_1X10,
+};
+
+/* Video */
+
+static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on)
+{
+	struct sun6i_mipi_csi2_video *video =
+		sun6i_mipi_csi2_subdev_video(subdev);
+	struct sun6i_mipi_csi2_dev *cdev = sun6i_mipi_csi2_video_dev(video);
+	struct v4l2_subdev *remote_subdev = video->remote_subdev;
+	struct v4l2_fwnode_bus_mipi_csi2 *bus_mipi_csi2 =
+		&video->endpoint.bus.mipi_csi2;
+	union phy_configure_opts dphy_opts = { 0 };
+	struct phy_configure_opts_mipi_dphy *dphy_cfg = &dphy_opts.mipi_dphy;
+	struct regmap *regmap = cdev->regmap;
+	struct v4l2_ctrl *ctrl;
+	unsigned int lanes_count;
+	unsigned int bpp;
+	unsigned long pixel_rate;
+	u8 data_type = 0;
+	u32 version = 0;
+	/* Initialize to 0 to use both in disable label (ret != 0) and off. */
+	int ret = 0;
+
+	if (!remote_subdev)
+		return -ENODEV;
+
+	if (!on) {
+		v4l2_subdev_call(remote_subdev, video, s_stream, 0);
+		goto disable;
+	}
+
+	switch (video->mbus_format.code) {
+	case MEDIA_BUS_FMT_SBGGR8_1X8:
+	case MEDIA_BUS_FMT_SGBRG8_1X8:
+	case MEDIA_BUS_FMT_SGRBG8_1X8:
+	case MEDIA_BUS_FMT_SRGGB8_1X8:
+		data_type = MIPI_CSI2_DATA_TYPE_RAW8;
+		bpp = 8;
+		break;
+	case MEDIA_BUS_FMT_SBGGR10_1X10:
+	case MEDIA_BUS_FMT_SGBRG10_1X10:
+	case MEDIA_BUS_FMT_SGRBG10_1X10:
+	case MEDIA_BUS_FMT_SRGGB10_1X10:
+		data_type = MIPI_CSI2_DATA_TYPE_RAW10;
+		bpp = 10;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Sensor pixel rate */
+
+	ctrl = v4l2_ctrl_find(remote_subdev->ctrl_handler, V4L2_CID_PIXEL_RATE);
+	if (!ctrl) {
+		dev_err(cdev->dev,
+			"%s: no MIPI CSI-2 pixel rate from the sensor\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	pixel_rate = (unsigned long)v4l2_ctrl_g_ctrl_int64(ctrl);
+	if (!pixel_rate) {
+		dev_err(cdev->dev,
+			"%s: zero MIPI CSI-2 pixel rate from the sensor\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	/* Power management */
+
+	ret = pm_runtime_get_sync(cdev->dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(cdev->dev);
+		return ret;
+	}
+
+	/* D-PHY configuration */
+
+	lanes_count = bus_mipi_csi2->num_data_lanes;
+	phy_mipi_dphy_get_default_config(pixel_rate, bpp, lanes_count,
+					 dphy_cfg);
+
+	/*
+	 * Note that our hardware is using DDR, which is not taken in account by
+	 * phy_mipi_dphy_get_default_config when calculating hs_clk_rate from
+	 * the pixel rate, lanes count and bpp.
+	 *
+	 * The resulting clock rate is basically the symbol rate over the whole
+	 * link. The actual clock rate is calculated with division by two since
+	 * DDR samples both on rising and falling edges.
+	 */
+
+	dev_dbg(cdev->dev, "A31 MIPI CSI-2 config:\n");
+	dev_dbg(cdev->dev, "%ld pixels/s, %u bits/pixel, %lu Hz clock\n",
+		pixel_rate, bpp, dphy_cfg->hs_clk_rate / 2);
+
+	ret = phy_reset(cdev->dphy);
+	if (ret) {
+		dev_err(cdev->dev, "failed to reset MIPI D-PHY\n");
+		goto error_pm;
+	}
+
+	ret = phy_set_mode_ext(cdev->dphy, PHY_MODE_MIPI_DPHY,
+			       PHY_MIPI_DPHY_SUBMODE_RX);
+	if (ret) {
+		dev_err(cdev->dev, "failed to set MIPI D-PHY mode\n");
+		goto error_pm;
+	}
+
+	ret = phy_configure(cdev->dphy, &dphy_opts);
+	if (ret) {
+		dev_err(cdev->dev, "failed to configure MIPI D-PHY\n");
+		goto error_pm;
+	}
+
+	ret = phy_power_on(cdev->dphy);
+	if (ret) {
+		dev_err(cdev->dev, "failed to power on MIPI D-PHY\n");
+		goto error_pm;
+	}
+
+	/* MIPI CSI-2 controller setup */
+
+	/*
+	 * The enable flow in the Allwinner BSP is a bit different: the enable
+	 * and reset bits are set together before starting the CSI controller.
+	 *
+	 * In mainline we enable the CSI controller first (due to subdev logic).
+	 * One reliable way to make this work is to deassert reset, configure
+	 * registers and enable the controller when everything's ready.
+	 *
+	 * However, setting the version enable bit and removing it afterwards
+	 * appears necessary for capture to work reliably, while replacing it
+	 * with a delay doesn't do the trick.
+	 */
+	regmap_write(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+		     SUN6I_MIPI_CSI2_CTL_RESET_N |
+		     SUN6I_MIPI_CSI2_CTL_VERSION_EN |
+		     SUN6I_MIPI_CSI2_CTL_UNPK_EN);
+
+	regmap_read(regmap, SUN6I_MIPI_CSI2_VERSION_REG, &version);
+
+	regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+			   SUN6I_MIPI_CSI2_CTL_VERSION_EN, 0);
+
+	dev_dbg(cdev->dev, "A31 MIPI CSI-2 version: %04x\n", version);
+
+	regmap_write(regmap, SUN6I_MIPI_CSI2_CFG_REG,
+		     SUN6I_MIPI_CSI2_CFG_CHANNEL_MODE(1) |
+		     SUN6I_MIPI_CSI2_CFG_LANE_COUNT(lanes_count));
+
+	/*
+	 * Our MIPI CSI-2 controller has internal channels that can be
+	 * configured to match a specific MIPI CSI-2 virtual channel and/or
+	 * a specific data type. Each internal channel can be piped to an
+	 * internal channel of the CSI controller.
+	 *
+	 * We set virtual channel numbers to all channels to make sure that
+	 * virtual channel 0 goes to CSI channel 0 only.
+	 */
+	regmap_write(regmap, SUN6I_MIPI_CSI2_VCDT_RX_REG,
+		     SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(3, 3) |
+		     SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(2, 2) |
+		     SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(1, 1) |
+		     SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(0, 0) |
+		     SUN6I_MIPI_CSI2_VCDT_RX_CH_DT(0, data_type));
+
+	regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+			   SUN6I_MIPI_CSI2_CTL_EN, SUN6I_MIPI_CSI2_CTL_EN);
+
+	ret = v4l2_subdev_call(remote_subdev, video, s_stream, 1);
+	if (ret)
+		goto disable;
+
+	return 0;
+
+disable:
+	regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+			   SUN6I_MIPI_CSI2_CTL_EN, 0);
+
+	phy_power_off(cdev->dphy);
+
+error_pm:
+	pm_runtime_put(cdev->dev);
+
+	return ret;
+}
+
+static const struct v4l2_subdev_video_ops sun6i_mipi_csi2_subdev_video_ops = {
+	.s_stream	= sun6i_mipi_csi2_s_stream,
+};
+
+/* Pad */
+
+static int
+sun6i_mipi_csi2_enum_mbus_code(struct v4l2_subdev *subdev,
+			       struct v4l2_subdev_pad_config *config,
+			       struct v4l2_subdev_mbus_code_enum *code_enum)
+{
+	if (code_enum->index >= ARRAY_SIZE(sun6i_mipi_csi2_mbus_codes))
+		return -EINVAL;
+
+	code_enum->code = sun6i_mipi_csi2_mbus_codes[code_enum->index];
+
+	return 0;
+}
+
+static int sun6i_mipi_csi2_get_fmt(struct v4l2_subdev *subdev,
+				   struct v4l2_subdev_pad_config *config,
+				   struct v4l2_subdev_format *format)
+{
+	struct sun6i_mipi_csi2_video *video =
+		sun6i_mipi_csi2_subdev_video(subdev);
+	struct v4l2_mbus_framefmt *mbus_format = &format->format;
+
+	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+		*mbus_format = *v4l2_subdev_get_try_format(subdev, config,
+							   format->pad);
+	else
+		*mbus_format = video->mbus_format;
+
+	return 0;
+}
+
+static int sun6i_mipi_csi2_set_fmt(struct v4l2_subdev *subdev,
+				   struct v4l2_subdev_pad_config *config,
+				   struct v4l2_subdev_format *format)
+{
+	struct sun6i_mipi_csi2_video *video =
+		sun6i_mipi_csi2_subdev_video(subdev);
+	struct v4l2_mbus_framefmt *mbus_format = &format->format;
+
+	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+		*v4l2_subdev_get_try_format(subdev, config, format->pad) =
+			*mbus_format;
+	else
+		video->mbus_format = *mbus_format;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_pad_ops sun6i_mipi_csi2_subdev_pad_ops = {
+	.enum_mbus_code	= sun6i_mipi_csi2_enum_mbus_code,
+	.get_fmt	= sun6i_mipi_csi2_get_fmt,
+	.set_fmt	= sun6i_mipi_csi2_set_fmt,
+};
+
+/* Subdev */
+
+static const struct v4l2_subdev_ops sun6i_mipi_csi2_subdev_ops = {
+	.video		= &sun6i_mipi_csi2_subdev_video_ops,
+	.pad		= &sun6i_mipi_csi2_subdev_pad_ops,
+};
+
+/* Notifier */
+
+static int
+sun6i_mipi_csi2_notifier_bound(struct v4l2_async_notifier *notifier,
+			       struct v4l2_subdev *remote_subdev,
+			       struct v4l2_async_subdev *remote_subdev_async)
+{
+	struct v4l2_subdev *subdev = notifier->sd;
+	struct sun6i_mipi_csi2_video *video =
+		sun6i_mipi_csi2_subdev_video(subdev);
+	struct sun6i_mipi_csi2_dev *cdev = sun6i_mipi_csi2_video_dev(video);
+	int source_pad;
+	int ret;
+
+	source_pad = media_entity_get_fwnode_pad(&remote_subdev->entity,
+						 remote_subdev->fwnode,
+						 MEDIA_PAD_FL_SOURCE);
+	if (source_pad < 0)
+		return source_pad;
+
+	ret = media_create_pad_link(&remote_subdev->entity, source_pad,
+				    &subdev->entity, 0,
+				    MEDIA_LNK_FL_ENABLED |
+				    MEDIA_LNK_FL_IMMUTABLE);
+	if (ret) {
+		dev_err(cdev->dev, "failed to create %s:%u -> %s:%u link\n",
+			remote_subdev->entity.name, source_pad,
+			subdev->entity.name, 0);
+		return ret;
+	}
+
+	video->remote_subdev = remote_subdev;
+
+	return 0;
+}
+
+static const
+struct v4l2_async_notifier_operations sun6i_mipi_csi2_notifier_ops = {
+	.bound		= sun6i_mipi_csi2_notifier_bound,
+};
+
+/* Media Entity */
+
+static const struct media_entity_operations sun6i_mipi_csi2_entity_ops = {
+	.link_validate	= v4l2_subdev_link_validate,
+};
+
+/* Base Driver */
+
+static int sun6i_mipi_csi2_suspend(struct device *dev)
+{
+	struct sun6i_mipi_csi2_dev *cdev = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(cdev->clk_mod);
+	clk_disable_unprepare(cdev->clk_bus);
+	reset_control_assert(cdev->reset);
+
+	return 0;
+}
+
+static int sun6i_mipi_csi2_resume(struct device *dev)
+{
+	struct sun6i_mipi_csi2_dev *cdev = dev_get_drvdata(dev);
+	int ret;
+
+	ret = reset_control_deassert(cdev->reset);
+	if (ret) {
+		dev_err(cdev->dev, "failed to deassert reset\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(cdev->clk_bus);
+	if (ret) {
+		dev_err(cdev->dev, "failed to enable bus clock\n");
+		goto error_reset;
+	}
+
+	ret = clk_prepare_enable(cdev->clk_mod);
+	if (ret) {
+		dev_err(cdev->dev, "failed to enable module clock\n");
+		goto error_clk_bus;
+	}
+
+	return 0;
+
+error_clk_bus:
+	clk_disable_unprepare(cdev->clk_bus);
+
+error_reset:
+	reset_control_assert(cdev->reset);
+
+	return ret;
+}
+
+static int sun6i_mipi_csi2_v4l2_setup(struct sun6i_mipi_csi2_dev *cdev)
+{
+	struct sun6i_mipi_csi2_video *video = &cdev->video;
+	struct v4l2_subdev *subdev = &video->subdev;
+	struct v4l2_async_notifier *notifier = &video->notifier;
+	struct fwnode_handle *handle = NULL;
+	struct v4l2_fwnode_endpoint *endpoint;
+	struct v4l2_async_subdev *subdev_async;
+	int ret;
+
+	/* Subdev */
+
+	v4l2_subdev_init(subdev, &sun6i_mipi_csi2_subdev_ops);
+	subdev->dev = cdev->dev;
+	subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	strscpy(subdev->name, MODULE_NAME, sizeof(subdev->name));
+	v4l2_set_subdevdata(subdev, cdev);
+
+	/* Entity */
+
+	subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+	subdev->entity.ops = &sun6i_mipi_csi2_entity_ops;
+
+	/* Pads */
+
+	video->pads[0].flags = MEDIA_PAD_FL_SINK;
+	video->pads[1].flags = MEDIA_PAD_FL_SOURCE;
+
+	ret = media_entity_pads_init(&subdev->entity, 2, video->pads);
+	if (ret)
+		return ret;
+
+	/* Endpoint */
+
+	handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(cdev->dev), 0, 0,
+						 FWNODE_GRAPH_ENDPOINT_NEXT);
+	if (!handle) {
+		ret = -ENODEV;
+		goto error_media_entity;
+	}
+
+	endpoint = &video->endpoint;
+	endpoint->bus_type = V4L2_MBUS_CSI2_DPHY;
+
+	ret = v4l2_fwnode_endpoint_parse(handle, endpoint);
+	fwnode_handle_put(handle);
+	if (ret)
+		goto error_media_entity;
+
+	/* Notifier */
+
+	v4l2_async_notifier_init(notifier);
+
+	subdev_async = &video->subdev_async;
+	ret = v4l2_async_notifier_add_fwnode_remote_subdev(notifier, handle,
+							   subdev_async);
+	if (ret)
+		goto error_media_entity;
+
+	fwnode_handle_put(handle);
+	handle = NULL;
+
+	video->notifier.ops = &sun6i_mipi_csi2_notifier_ops;
+
+	ret = v4l2_async_subdev_notifier_register(subdev, notifier);
+	if (ret < 0)
+		goto error_notifier;
+
+	/* Runtime PM */
+
+	pm_runtime_enable(cdev->dev);
+	pm_runtime_set_suspended(cdev->dev);
+
+	/* Subdev */
+
+	ret = v4l2_async_register_subdev(subdev);
+	if (ret < 0)
+		goto error_pm;
+
+	return 0;
+
+error_pm:
+	pm_runtime_disable(cdev->dev);
+	v4l2_async_notifier_unregister(notifier);
+
+error_notifier:
+	v4l2_async_notifier_cleanup(notifier);
+
+error_media_entity:
+	if (handle)
+		fwnode_handle_put(handle);
+
+	media_entity_cleanup(&subdev->entity);
+
+	return ret;
+}
+
+static int sun6i_mipi_csi2_v4l2_teardown(struct sun6i_mipi_csi2_dev *cdev)
+{
+	struct sun6i_mipi_csi2_video *video = &cdev->video;
+	struct v4l2_subdev *subdev = &video->subdev;
+	struct v4l2_async_notifier *notifier = &video->notifier;
+
+	v4l2_async_unregister_subdev(subdev);
+	pm_runtime_disable(cdev->dev);
+	v4l2_async_notifier_unregister(notifier);
+	v4l2_async_notifier_cleanup(notifier);
+	media_entity_cleanup(&subdev->entity);
+	v4l2_device_unregister_subdev(subdev);
+
+	return 0;
+}
+
+static const struct regmap_config sun6i_mipi_csi2_regmap_config = {
+	.reg_bits       = 32,
+	.reg_stride     = 4,
+	.val_bits       = 32,
+	.max_register	= 0x400,
+};
+
+static int sun6i_mipi_csi2_probe(struct platform_device *pdev)
+{
+	struct sun6i_mipi_csi2_dev *cdev;
+	struct resource *res;
+	void __iomem *io_base;
+	int ret;
+
+	cdev = devm_kzalloc(&pdev->dev, sizeof(*cdev), GFP_KERNEL);
+	if (!cdev)
+		return -ENOMEM;
+
+	cdev->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	io_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(io_base))
+		return PTR_ERR(io_base);
+
+	cdev->regmap = devm_regmap_init_mmio(&pdev->dev, io_base,
+					     &sun6i_mipi_csi2_regmap_config);
+	if (IS_ERR(cdev->regmap)) {
+		dev_err(&pdev->dev, "failed to init register map\n");
+		return PTR_ERR(cdev->regmap);
+	}
+
+	cdev->clk_bus = devm_clk_get(&pdev->dev, "bus");
+	if (IS_ERR(cdev->clk_bus)) {
+		dev_err(&pdev->dev, "failed to acquire bus clock\n");
+		return PTR_ERR(cdev->clk_bus);
+	}
+
+	cdev->clk_mod = devm_clk_get(&pdev->dev, "mod");
+	if (IS_ERR(cdev->clk_mod)) {
+		dev_err(&pdev->dev, "failed to acquire mod clock\n");
+		return PTR_ERR(cdev->clk_mod);
+	}
+
+	cdev->reset = devm_reset_control_get_shared(&pdev->dev, NULL);
+	if (IS_ERR(cdev->reset)) {
+		dev_err(&pdev->dev, "failed to get reset controller\n");
+		return PTR_ERR(cdev->reset);
+	}
+
+	cdev->dphy = devm_phy_get(&pdev->dev, "dphy");
+	if (IS_ERR(cdev->dphy)) {
+		dev_err(&pdev->dev, "failed to get the MIPI D-PHY\n");
+		return PTR_ERR(cdev->dphy);
+	}
+
+	ret = phy_init(cdev->dphy);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize the MIPI D-PHY\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, cdev);
+
+	ret = sun6i_mipi_csi2_v4l2_setup(cdev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int sun6i_mipi_csi2_remove(struct platform_device *pdev)
+{
+	struct sun6i_mipi_csi2_dev *cdev = platform_get_drvdata(pdev);
+
+	phy_exit(cdev->dphy);
+
+	return sun6i_mipi_csi2_v4l2_teardown(cdev);
+}
+
+static const struct dev_pm_ops sun6i_mipi_csi2_pm_ops = {
+	SET_RUNTIME_PM_OPS(sun6i_mipi_csi2_suspend, sun6i_mipi_csi2_resume,
+			   NULL)
+};
+
+static const struct of_device_id sun6i_mipi_csi2_of_match[] = {
+	{ .compatible = "allwinner,sun6i-a31-mipi-csi2" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sun6i_mipi_csi2_of_match);
+
+static struct platform_driver sun6i_mipi_csi2_platform_driver = {
+	.probe = sun6i_mipi_csi2_probe,
+	.remove = sun6i_mipi_csi2_remove,
+	.driver = {
+		.name = MODULE_NAME,
+		.of_match_table = of_match_ptr(sun6i_mipi_csi2_of_match),
+		.pm = &sun6i_mipi_csi2_pm_ops,
+	},
+};
+module_platform_driver(sun6i_mipi_csi2_platform_driver);
+
+MODULE_DESCRIPTION("Allwinner A31 MIPI CSI-2 Controller Driver");
+MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@...tlin.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h
new file mode 100644
index 000000000000..0869dc7db3b5
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
+ */
+
+#ifndef __SUN6I_MIPI_CSI2_H__
+#define __SUN6I_MIPI_CSI2_H__
+
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+
+#define SUN6I_MIPI_CSI2_CTL_REG				0x0
+#define SUN6I_MIPI_CSI2_CTL_RESET_N			BIT(31)
+#define SUN6I_MIPI_CSI2_CTL_VERSION_EN			BIT(30)
+#define SUN6I_MIPI_CSI2_CTL_UNPK_EN			BIT(1)
+#define SUN6I_MIPI_CSI2_CTL_EN				BIT(0)
+#define SUN6I_MIPI_CSI2_CFG_REG				0x4
+#define SUN6I_MIPI_CSI2_CFG_CHANNEL_MODE(v)		((((v) - 1) << 8) & \
+							 GENMASK(9, 8))
+#define SUN6I_MIPI_CSI2_CFG_LANE_COUNT(v)		(((v) - 1) & GENMASK(1, 0))
+#define SUN6I_MIPI_CSI2_VCDT_RX_REG			0x8
+#define SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(ch, vc)		(((vc) & GENMASK(1, 0)) << \
+							 ((ch) * 8 + 6))
+#define SUN6I_MIPI_CSI2_VCDT_RX_CH_DT(ch, t)		(((t) & GENMASK(5, 0)) << \
+							 ((ch) * 8))
+#define SUN6I_MIPI_CSI2_RX_PKT_NUM_REG			0xc
+
+#define SUN6I_MIPI_CSI2_VERSION_REG			0x3c
+
+#define SUN6I_MIPI_CSI2_CH_BASE				0x1000
+#define SUN6I_MIPI_CSI2_CH_OFFSET			0x100
+
+#define SUN6I_MIPI_CSI2_CH_CFG_REG			0x40
+#define SUN6I_MIPI_CSI2_CH_INT_EN_REG			0x50
+#define SUN6I_MIPI_CSI2_CH_INT_EN_EOT_ERR		BIT(29)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_CHKSUM_ERR		BIT(28)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_ECC_WRN		BIT(27)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_ECC_ERR		BIT(26)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_LINE_SYNC_ERR		BIT(25)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FRAME_SYNC_ERR	BIT(24)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_EMB_DATA		BIT(18)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_PF			BIT(17)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_PH_UPDATE		BIT(16)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_LINE_START_SYNC	BIT(11)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_LINE_END_SYNC	BIT(10)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FRAME_START_SYNC	BIT(9)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FRAME_END_SYNC	BIT(8)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FIFO_OVER		BIT(0)
+
+#define SUN6I_MIPI_CSI2_CH_INT_PD_REG			0x58
+#define SUN6I_MIPI_CSI2_CH_INT_PD_EOT_ERR		BIT(29)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_CHKSUM_ERR		BIT(28)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_ECC_WRN		BIT(27)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_ECC_ERR		BIT(26)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_LINE_SYNC_ERR		BIT(25)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FRAME_SYNC_ERR	BIT(24)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_EMB_DATA		BIT(18)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_PF			BIT(17)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_PH_UPDATE		BIT(16)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_LINE_START_SYNC	BIT(11)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_LINE_END_SYNC		BIT(10)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FRAME_START_SYNC	BIT(9)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FRAME_END_SYNC	BIT(8)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FIFO_OVER		BIT(0)
+
+#define SUN6I_MIPI_CSI2_CH_DT_TRIGGER_REG		0x60
+#define SUN6I_MIPI_CSI2_CH_CUR_PH_REG			0x70
+#define SUN6I_MIPI_CSI2_CH_ECC_REG			0x74
+#define SUN6I_MIPI_CSI2_CH_CKS_REG			0x78
+#define SUN6I_MIPI_CSI2_CH_FRAME_NUM_REG		0x7c
+#define SUN6I_MIPI_CSI2_CH_LINE_NUM_REG			0x80
+
+#define SUN6I_MIPI_CSI2_CH_REG(reg, ch) \
+	(SUN6I_MIPI_CSI2_CH_BASE + SUN6I_MIPI_CSI2_CH_OFFSET * (ch) + (reg))
+
+enum mipi_csi2_data_type {
+	MIPI_CSI2_DATA_TYPE_RAW8	= 0x2a,
+	MIPI_CSI2_DATA_TYPE_RAW10	= 0x2b,
+	MIPI_CSI2_DATA_TYPE_RAW12	= 0x2c,
+};
+
+struct sun6i_mipi_csi2_video {
+	struct v4l2_fwnode_endpoint endpoint;
+	struct v4l2_subdev subdev;
+	struct media_pad pads[2];
+
+	struct v4l2_async_subdev subdev_async;
+	struct v4l2_async_notifier notifier;
+
+	struct v4l2_subdev *remote_subdev;
+
+	struct v4l2_mbus_framefmt mbus_format;
+};
+
+struct sun6i_mipi_csi2_dev {
+	struct device *dev;
+
+	struct regmap *regmap;
+	struct clk *clk_bus;
+	struct clk *clk_mod;
+	struct reset_control *reset;
+	struct phy *dphy;
+
+	struct sun6i_mipi_csi2_video video;
+};
+
+#define sun6i_mipi_csi2_subdev_video(s) \
+	container_of(s, struct sun6i_mipi_csi2_video, subdev)
+
+#define sun6i_mipi_csi2_video_dev(v) \
+	container_of(v, struct sun6i_mipi_csi2_dev, video)
+
+#endif /* __SUN6I_MIPI_CSI2_H__ */
-- 
2.30.0

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