[v8-rc1 00/20] GMSL: max9286-v8-rc1 + RDAMC20-v8

[v8-rc1 00/20] GMSL: max9286-v8-rc1 + RDAMC20-v8

[Jacopo Mondi]

Hello Kieran,
   please fine here a slight rework of your fixup series to be applied
on top of max9286-v7.

The main changes are:
- overlap window: write registers 0x63 and 0x64 directly. Going through the
                  function breaks RDACM21 operations. To be investigated.
- pixel rate control: Make mandatory for remotes to report pixel rate, and
		     use it calculate max9286 one.
- rebase on latest media-master

On top of that I have added v8 of RDACM20.
The changes compared to v7 are considerable, and reported in the single
patch change log. I have 30+ fixup patches on top of rdacm20-v7 that could
be singularly reviewed, but not to flood the list I squashed them in in
this version. As detailed in the patch change log the changes are available
singularly in a repository in my git tree.

I have tested this version on Salvator-X with 4 RDACM20.

Ideally, there could be a bit more cleanup to do in the max9286 probe routines
as suggested in the review of your series, but I left it out not to take away
all the fun from you :p

After a sanity check, I would propose to squash everything in and move
to linux-media to have this hopefully collected!

Thanks
  j

Jacopo Mondi (5):
  squash!: max9286: Rebase on latest media/master
  squash! max9286: Calculate pixel rate
  squash! max9286: Put of node on error
  dt-bindings: media: i2c: Add bindings for IMI RDACM2x
  media: i2c: Add RDACM20 driver

Kieran Bingham (15):
  media: i2c: Add MAX9286 driver
  fixup! media: i2c: Add MAX9286 driver
  squash! max9286: Update the bound_sources mask on unbind
  squash! max9286: convert probe kzalloc
  squash! max9286: Fix cleanup path from GPIO powerdown
  squash! max9286: cleanup GPIO device registration fail path
  squash! max9286: Convert to use devm_regulator_get()
  squash! max9286: Fit max9286_parse_dt print on one line
  squash! max9286: Move multi-device workarounds out of upstream
  squash! max9286: Remove I2C mod-table
  sqaush! max9286: Lock format changes
  squash! max9286: Implement Pixelrate control
  squash! max9286: Disable overlap window
  sqaush! max9286: Describe pad index usage
  sqaush! max9286: Remove poc_enabled workaround

 .../bindings/media/i2c/imi,rdacm2x-gmsl.yaml  |  161 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |    2 +
 MAINTAINERS                                   |   22 +
 drivers/media/i2c/Kconfig                     |   25 +
 drivers/media/i2c/Makefile                    |    3 +
 drivers/media/i2c/max9271.c                   |  330 ++++
 drivers/media/i2c/max9271.h                   |  224 +++
 drivers/media/i2c/max9286.c                   | 1349 +++++++++++++++++
 drivers/media/i2c/rdacm20.c                   |  668 ++++++++
 9 files changed, 2784 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
 create mode 100644 drivers/media/i2c/max9271.c
 create mode 100644 drivers/media/i2c/max9271.h
 create mode 100644 drivers/media/i2c/max9286.c
 create mode 100644 drivers/media/i2c/rdacm20.c

--
2.26.0

[v8-rc1 01/20] media: i2c: Add MAX9286 driver

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and
CSI-2 output. The device supports multicamera streaming applications,
and features the ability to synchronise the attached cameras.

CSI-2 output can be configured with 1 to 4 lanes, and a control channel
is supported over I2C, which implements an I2C mux to facilitate
communications with connected cameras across the reverse control
channel.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

--
v2:
 - Fix MAINTAINERS entry

This posting is released with the following modifications to work
without Sakari's VC developments:
 - max9286_g_mbus_config() re-instated
 - max9286_get_frame_desc() is not bus/csi aware
 - max9286_{get,set}_routing() removed

v3:
 - Initialise notifier with v4l2_async_notifier_init
 - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY

v4: - Re-introduce required code to function with the VC series.

 - Implement max9286_get_routing, max9286_set_routing
 - Remove max9286_g_mbus_config

v5: (internal release)
 - Fix printk formatting for hex value
 - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |)
 - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE
 - Remove 'device is bound' workaround

v6:
 - v4l2_subdev_krouting instead of v4l2_subdev_routing separated
   to allow integration without the VC/V4L2-Mux series.
 - convert sd_to_max9286 to inline function
 - rename max9286_device to max9286_priv
 - Cleanup the v4l2_async_notifier
 - Extend MODULE_AUTHOR
 - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id
 - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam)
 - Use new YAML file reference in MAINTAINERS
 - Parse new i2c-mux node in max9286_get_i2c_by_id
   (This could/should be refactored to parse these separately first)
 - Spelling and calculation fixes in the FSYNC_LOCKED check comments
 - Identify each enabled i2c-mux channel in a single pass
 - max9286: Improve mux-state readbility [v2]
 - Fix frame sync lock durations
 - Add comment to describe /why/ we must open the mux in s_stream
 - use -EXDEV as return code for failed link synchronisation.
 - Fix reference counting of the dt nodeS
 - Convert to probe_new for I2C
 - Remove redundant max9286_i2c_mux_state
 - Provide optional enable-gpio (max9286-pwdn)

v7:
 [Kieran]
 - Ensure powerdown lines are optional
 - Add a 4ms power-up delay
 - Add max9286_check_config_link() to core
 - Add GPIO chip controller for GPIO0OUT and GPIO1OUT
 - Fix GPIO registration
 - max9286: Split out async registration
   (fixes regulator -EPROBE_DEFERs failures)
 - Collect all V4L2 registrations
 - balance v4l2_async refcnting
 - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_

 [Jacopo]
 - Remove redundanct MAXIM_I2C_SPEED macros
 - Move notifiers operations
 - Add delay after reverse channel reconfiguration
 - Move link setup to completion
 - Fix up max9286_check_config_link() implementation
 - Remove redundant dual configuration of reverse channel
---
 MAINTAINERS                 |   10 +
 drivers/media/i2c/Kconfig   |   11 +
 drivers/media/i2c/Makefile  |    1 +
 drivers/media/i2c/max9286.c | 1278 +++++++++++++++++++++++++++++++++++
 4 files changed, 1300 insertions(+)
 create mode 100644 drivers/media/i2c/max9286.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 297197b05562..242ec17644c3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10268,6 +10268,16 @@ F:	Documentation/hwmon/max6697.rst
 F:	drivers/hwmon/max6697.c
 F:	include/linux/platform_data/max6697.h
 
+MAX9286 QUAD GMSL DESERIALIZER DRIVER
+M:	Jacopo Mondi <jacopo+renesas@jmondi.org>
+M:	Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
+M:	Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
+M:	Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
+F:	drivers/media/i2c/max9286.c
+
 MAX9860 MONO AUDIO VOICE CODEC DRIVER
 M:	Peter Rosin <peda@axentia.se>
 L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 3abc80373ec0..04186787a2f0 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -464,6 +464,17 @@ config VIDEO_VPX3220
 	  To compile this driver as a module, choose M here: the
 	  module will be called vpx3220.
 
+config VIDEO_MAX9286
+	tristate "Maxim MAX9286 GMSL deserializer support"
+	depends on I2C && I2C_MUX
+	depends on VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
+	select V4L2_FWNODE
+	help
+	  This driver supports the Maxim MAX9286 GMSL deserializer.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called max9286.
+
 comment "Video and audio decoders"
 
 config VIDEO_SAA717X
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 77bf7d0b691f..29379008d624 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -118,5 +118,6 @@ obj-$(CONFIG_VIDEO_IMX290)	+= imx290.o
 obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
 obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
 obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
+obj-$(CONFIG_VIDEO_MAX9286)	+= max9286.o
 
 obj-$(CONFIG_SDR_MAX2175) += max2175.o
diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
new file mode 100644
index 000000000000..a20829297ef6
--- /dev/null
+++ b/drivers/media/i2c/max9286.c
@@ -0,0 +1,1278 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Maxim MAX9286 GMSL Deserializer Driver
+ *
+ * Copyright (C) 2017-2019 Jacopo Mondi
+ * Copyright (C) 2017-2019 Kieran Bingham
+ * Copyright (C) 2017-2019 Laurent Pinchart
+ * Copyright (C) 2017-2019 Niklas Söderlund
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ * Copyright (C) 2015 Cogent Embedded, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/fwnode.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/i2c.h>
+#include <linux/i2c-mux.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+/* Register 0x00 */
+#define MAX9286_MSTLINKSEL_AUTO		(7 << 5)
+#define MAX9286_MSTLINKSEL(n)		((n) << 5)
+#define MAX9286_EN_VS_GEN		BIT(4)
+#define MAX9286_LINKEN(n)		(1 << (n))
+/* Register 0x01 */
+#define MAX9286_FSYNCMODE_ECU		(3 << 6)
+#define MAX9286_FSYNCMODE_EXT		(2 << 6)
+#define MAX9286_FSYNCMODE_INT_OUT	(1 << 6)
+#define MAX9286_FSYNCMODE_INT_HIZ	(0 << 6)
+#define MAX9286_GPIEN			BIT(5)
+#define MAX9286_ENLMO_RSTFSYNC		BIT(2)
+#define MAX9286_FSYNCMETH_AUTO		(2 << 0)
+#define MAX9286_FSYNCMETH_SEMI_AUTO	(1 << 0)
+#define MAX9286_FSYNCMETH_MANUAL	(0 << 0)
+#define MAX9286_REG_FSYNC_PERIOD_L	0x06
+#define MAX9286_REG_FSYNC_PERIOD_M	0x07
+#define MAX9286_REG_FSYNC_PERIOD_H	0x08
+/* Register 0x0a */
+#define MAX9286_FWDCCEN(n)		(1 << ((n) + 4))
+#define MAX9286_REVCCEN(n)		(1 << (n))
+/* Register 0x0c */
+#define MAX9286_HVEN			BIT(7)
+#define MAX9286_EDC_6BIT_HAMMING	(2 << 5)
+#define MAX9286_EDC_6BIT_CRC		(1 << 5)
+#define MAX9286_EDC_1BIT_PARITY		(0 << 5)
+#define MAX9286_DESEL			BIT(4)
+#define MAX9286_INVVS			BIT(3)
+#define MAX9286_INVHS			BIT(2)
+#define MAX9286_HVSRC_D0		(2 << 0)
+#define MAX9286_HVSRC_D14		(1 << 0)
+#define MAX9286_HVSRC_D18		(0 << 0)
+/* Register 0x0f */
+#define MAX9286_0X0F_RESERVED		BIT(3)
+/* Register 0x12 */
+#define MAX9286_CSILANECNT(n)		(((n) - 1) << 6)
+#define MAX9286_CSIDBL			BIT(5)
+#define MAX9286_DBL			BIT(4)
+#define MAX9286_DATATYPE_USER_8BIT	(11 << 0)
+#define MAX9286_DATATYPE_USER_YUV_12BIT	(10 << 0)
+#define MAX9286_DATATYPE_USER_24BIT	(9 << 0)
+#define MAX9286_DATATYPE_RAW14		(8 << 0)
+#define MAX9286_DATATYPE_RAW11		(7 << 0)
+#define MAX9286_DATATYPE_RAW10		(6 << 0)
+#define MAX9286_DATATYPE_RAW8		(5 << 0)
+#define MAX9286_DATATYPE_YUV422_10BIT	(4 << 0)
+#define MAX9286_DATATYPE_YUV422_8BIT	(3 << 0)
+#define MAX9286_DATATYPE_RGB555		(2 << 0)
+#define MAX9286_DATATYPE_RGB565		(1 << 0)
+#define MAX9286_DATATYPE_RGB888		(0 << 0)
+/* Register 0x15 */
+#define MAX9286_VC(n)			((n) << 5)
+#define MAX9286_VCTYPE			BIT(4)
+#define MAX9286_CSIOUTEN		BIT(3)
+#define MAX9286_0X15_RESV		(3 << 0)
+/* Register 0x1b */
+#define MAX9286_SWITCHIN(n)		(1 << ((n) + 4))
+#define MAX9286_ENEQ(n)			(1 << (n))
+/* Register 0x27 */
+#define MAX9286_LOCKED			BIT(7)
+/* Register 0x31 */
+#define MAX9286_FSYNC_LOCKED		BIT(6)
+/* Register 0x34 */
+#define MAX9286_I2CLOCACK		BIT(7)
+#define MAX9286_I2CSLVSH_1046NS_469NS	(3 << 5)
+#define MAX9286_I2CSLVSH_938NS_352NS	(2 << 5)
+#define MAX9286_I2CSLVSH_469NS_234NS	(1 << 5)
+#define MAX9286_I2CSLVSH_352NS_117NS	(0 << 5)
+#define MAX9286_I2CMSTBT_837KBPS	(7 << 2)
+#define MAX9286_I2CMSTBT_533KBPS	(6 << 2)
+#define MAX9286_I2CMSTBT_339KBPS	(5 << 2)
+#define MAX9286_I2CMSTBT_173KBPS	(4 << 2)
+#define MAX9286_I2CMSTBT_105KBPS	(3 << 2)
+#define MAX9286_I2CMSTBT_84KBPS		(2 << 2)
+#define MAX9286_I2CMSTBT_28KBPS		(1 << 2)
+#define MAX9286_I2CMSTBT_8KBPS		(0 << 2)
+#define MAX9286_I2CSLVTO_NONE		(3 << 0)
+#define MAX9286_I2CSLVTO_1024US		(2 << 0)
+#define MAX9286_I2CSLVTO_256US		(1 << 0)
+#define MAX9286_I2CSLVTO_64US		(0 << 0)
+/* Register 0x3b */
+#define MAX9286_REV_TRF(n)		((n) << 4)
+#define MAX9286_REV_AMP(n)		((((n) - 30) / 10) << 1) /* in mV */
+#define MAX9286_REV_AMP_X		BIT(0)
+/* Register 0x3f */
+#define MAX9286_EN_REV_CFG		BIT(6)
+#define MAX9286_REV_FLEN(n)		((n) - 20)
+/* Register 0x49 */
+#define MAX9286_VIDEO_DETECT_MASK	0x0f
+/* Register 0x69 */
+#define MAX9286_LFLTBMONMASKED		BIT(7)
+#define MAX9286_LOCKMONMASKED		BIT(6)
+#define MAX9286_AUTOCOMBACKEN		BIT(5)
+#define MAX9286_AUTOMASKEN		BIT(4)
+#define MAX9286_MASKLINK(n)		((n) << 0)
+
+#define MAX9286_NUM_GMSL		4
+#define MAX9286_N_SINKS			4
+#define MAX9286_N_PADS			5
+#define MAX9286_SRC_PAD			4
+
+struct max9286_source {
+	struct v4l2_async_subdev asd;
+	struct v4l2_subdev *sd;
+	struct fwnode_handle *fwnode;
+};
+
+#define asd_to_max9286_source(_asd) \
+	container_of(_asd, struct max9286_source, asd)
+
+struct max9286_priv {
+	struct i2c_client *client;
+	struct gpio_desc *gpiod_pwdn;
+	struct v4l2_subdev sd;
+	struct media_pad pads[MAX9286_N_PADS];
+	struct regulator *regulator;
+	bool poc_enabled;
+
+	struct gpio_chip gpio;
+	u8 gpio_state;
+
+	struct i2c_mux_core *mux;
+	unsigned int mux_channel;
+	bool mux_open;
+
+	struct v4l2_ctrl_handler ctrls;
+
+	struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS];
+
+	unsigned int nsources;
+	unsigned int source_mask;
+	unsigned int route_mask;
+	unsigned int bound_sources;
+	unsigned int csi2_data_lanes;
+	struct max9286_source sources[MAX9286_NUM_GMSL];
+	struct v4l2_async_notifier notifier;
+};
+
+static struct max9286_source *next_source(struct max9286_priv *priv,
+					  struct max9286_source *source)
+{
+	if (!source)
+		source = &priv->sources[0];
+	else
+		source++;
+
+	for (; source < &priv->sources[MAX9286_NUM_GMSL]; source++) {
+		if (source->fwnode)
+			return source;
+	}
+
+	return NULL;
+}
+
+#define for_each_source(priv, source) \
+	for ((source) = NULL; ((source) = next_source((priv), (source))); )
+
+#define to_index(priv, source) ((source) - &(priv)->sources[0])
+
+static inline struct max9286_priv *sd_to_max9286(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct max9286_priv, sd);
+}
+
+/* -----------------------------------------------------------------------------
+ * I2C IO
+ */
+
+static int max9286_read(struct max9286_priv *priv, u8 reg)
+{
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(priv->client, reg);
+	if (ret < 0)
+		dev_err(&priv->client->dev,
+			"%s: register 0x%02x read failed (%d)\n",
+			__func__, reg, ret);
+
+	return ret;
+}
+
+static int max9286_write(struct max9286_priv *priv, u8 reg, u8 val)
+{
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(priv->client, reg, val);
+	if (ret < 0)
+		dev_err(&priv->client->dev,
+			"%s: register 0x%02x write failed (%d)\n",
+			__func__, reg, ret);
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * I2C Multiplexer
+ */
+
+static void max9286_i2c_mux_configure(struct max9286_priv *priv, u8 conf)
+{
+	max9286_write(priv, 0x0a, conf);
+
+	/*
+	 * We must sleep after any change to the forward or reverse channel
+	 * configuration.
+	 */
+	usleep_range(3000, 5000);
+}
+
+static void max9286_i2c_mux_open(struct max9286_priv *priv)
+{
+	/* Open all channels on the MAX9286 */
+	max9286_i2c_mux_configure(priv, 0xff);
+
+	priv->mux_open = true;
+}
+
+static void max9286_i2c_mux_close(struct max9286_priv *priv)
+{
+	/*
+	 * Ensure that both the forward and reverse channel are disabled on the
+	 * mux, and that the channel ID is invalidated to ensure we reconfigure
+	 * on the next max9286_i2c_mux_select() call.
+	 */
+	max9286_i2c_mux_configure(priv, 0x00);
+
+	priv->mux_open = false;
+	priv->mux_channel = -1;
+}
+
+static int max9286_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
+{
+	struct max9286_priv *priv = i2c_mux_priv(muxc);
+
+	/* Channel select is disabled when configured in the opened state. */
+	if (priv->mux_open)
+		return 0;
+
+	if (priv->mux_channel == chan)
+		return 0;
+
+	priv->mux_channel = chan;
+
+	max9286_i2c_mux_configure(priv,
+				  MAX9286_FWDCCEN(chan) |
+				  MAX9286_REVCCEN(chan));
+
+	return 0;
+}
+
+static int max9286_i2c_mux_init(struct max9286_priv *priv)
+{
+	struct max9286_source *source;
+	int ret;
+
+	if (!i2c_check_functionality(priv->client->adapter,
+				     I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+		return -ENODEV;
+
+	priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev,
+				  priv->nsources, 0, I2C_MUX_LOCKED,
+				  max9286_i2c_mux_select, NULL);
+	if (!priv->mux)
+		return -ENOMEM;
+
+	priv->mux->priv = priv;
+
+	for_each_source(priv, source) {
+		unsigned int index = to_index(priv, source);
+
+		ret = i2c_mux_add_adapter(priv->mux, 0, index, 0);
+		if (ret < 0)
+			goto error;
+	}
+
+	return 0;
+
+error:
+	i2c_mux_del_adapters(priv->mux);
+	return ret;
+}
+
+static void max9286_configure_i2c(struct max9286_priv *priv, bool localack)
+{
+	u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US |
+		    MAX9286_I2CMSTBT_105KBPS;
+
+	if (localack)
+		config |= MAX9286_I2CLOCACK;
+
+	max9286_write(priv, 0x34, config);
+	usleep_range(3000, 5000);
+}
+
+/*
+ * max9286_check_video_links() - Make sure video links are detected and locked
+ *
+ * Performs safety checks on video link status. Make sure they are detected
+ * and all enabled links are locked.
+ *
+ * Returns 0 for success, -EIO for errors.
+ */
+static int max9286_check_video_links(struct max9286_priv *priv)
+{
+	unsigned int i;
+	int ret;
+
+	/*
+	 * Make sure valid video links are detected.
+	 * The delay is not characterized in de-serializer manual, wait up
+	 * to 5 ms.
+	 */
+	for (i = 0; i < 10; i++) {
+		ret = max9286_read(priv, 0x49);
+		if (ret < 0)
+			return -EIO;
+
+		if ((ret & MAX9286_VIDEO_DETECT_MASK) == priv->source_mask)
+			break;
+
+		usleep_range(350, 500);
+	}
+
+	if (i == 10) {
+		dev_err(&priv->client->dev,
+			"Unable to detect video links: 0x%02x\n", ret);
+		return -EIO;
+	}
+
+	/* Make sure all enabled links are locked (4ms max). */
+	for (i = 0; i < 10; i++) {
+		ret = max9286_read(priv, 0x27);
+		if (ret < 0)
+			return -EIO;
+
+		if (ret & MAX9286_LOCKED)
+			break;
+
+		usleep_range(350, 450);
+	}
+
+	if (i == 10) {
+		dev_err(&priv->client->dev, "Not all enabled links locked\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/*
+ * max9286_check_config_link() - Detect and wait for configuration links
+ *
+ * Determine if the configuration channel is up and settled for a link.
+ *
+ * Returns 0 for success, -EIO for errors.
+ */
+static int max9286_check_config_link(struct max9286_priv *priv,
+				     unsigned int source_mask)
+{
+	unsigned int conflink_mask = (source_mask & 0x0f) << 4;
+	unsigned int i;
+	int ret;
+
+	/*
+	 * Make sure requested configuration links are detected.
+	 * The delay is not characterized in the chip manual: wait up
+	 * to 5 milliseconds.
+	 */
+	for (i = 0; i < 10; i++) {
+		ret = max9286_read(priv, 0x49) & 0xf0;
+		if (ret < 0)
+			return -EIO;
+
+		if (ret == conflink_mask)
+			break;
+
+		usleep_range(350, 500);
+	}
+
+	if (ret != conflink_mask) {
+		dev_err(&priv->client->dev,
+			"Unable to detect configuration links: 0x%02x expected 0x%02x\n",
+			ret, conflink_mask);
+		return -EIO;
+	}
+
+	dev_info(&priv->client->dev,
+		 "Successfully detected configuration links after %u loops: 0x%02x\n",
+		 i, conflink_mask);
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdev
+ */
+
+static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
+				struct v4l2_subdev *subdev,
+				struct v4l2_async_subdev *asd)
+{
+	struct max9286_priv *priv = sd_to_max9286(notifier->sd);
+	struct max9286_source *source = asd_to_max9286_source(asd);
+	unsigned int index = to_index(priv, source);
+	unsigned int src_pad;
+	int ret;
+
+	ret = media_entity_get_fwnode_pad(&subdev->entity,
+					  source->fwnode,
+					  MEDIA_PAD_FL_SOURCE);
+	if (ret < 0) {
+		dev_err(&priv->client->dev,
+			"Failed to find pad for %s\n", subdev->name);
+		return ret;
+	}
+
+	priv->bound_sources |= BIT(index);
+	source->sd = subdev;
+	src_pad = ret;
+
+	ret = media_create_pad_link(&source->sd->entity, src_pad,
+				    &priv->sd.entity, index,
+				    MEDIA_LNK_FL_ENABLED |
+				    MEDIA_LNK_FL_IMMUTABLE);
+	if (ret) {
+		dev_err(&priv->client->dev,
+			"Unable to link %s:%u -> %s:%u\n",
+			source->sd->name, src_pad, priv->sd.name, index);
+		return ret;
+	}
+
+	dev_dbg(&priv->client->dev, "Bound %s pad: %u on index %u\n",
+		subdev->name, src_pad, index);
+
+	/*
+	 * We can only register v4l2_async_notifiers which do not provide a
+	 * means to register a complete callback. bound_sources allows us to
+	 * identify when all remove serializers have completed their probe.
+	 */
+	if (priv->bound_sources != priv->source_mask)
+		return 0;
+
+	/*
+	 * All enabled sources have probed and enabled their reverse control
+	 * channels:
+	 *
+	 * - Verify all configuration links are properly detected
+	 * - Disable auto-ack as communication on the control channel are now
+	 *   stable.
+	 */
+	max9286_check_config_link(priv, priv->source_mask);
+
+	/*
+	 * Re-configure I2C with local acknowledge disabled after cameras have
+	 * probed.
+	 */
+	max9286_configure_i2c(priv, false);
+
+	return 0;
+}
+
+static void max9286_notify_unbind(struct v4l2_async_notifier *notifier,
+				  struct v4l2_subdev *subdev,
+				  struct v4l2_async_subdev *asd)
+{
+	struct max9286_source *source = asd_to_max9286_source(asd);
+
+	source->sd = NULL;
+}
+
+static const struct v4l2_async_notifier_operations max9286_notify_ops = {
+	.bound = max9286_notify_bound,
+	.unbind = max9286_notify_unbind,
+};
+
+static int max9286_v4l2_notifier_register(struct max9286_priv *priv)
+{
+	struct device *dev = &priv->client->dev;
+	struct max9286_source *source = NULL;
+	int ret;
+
+	if (!priv->nsources)
+		return 0;
+
+	v4l2_async_notifier_init(&priv->notifier);
+
+	for_each_source(priv, source) {
+		unsigned int i = to_index(priv, source);
+
+		source->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
+		source->asd.match.fwnode = source->fwnode;
+
+		ret = v4l2_async_notifier_add_subdev(&priv->notifier,
+						     &source->asd);
+		if (ret) {
+			dev_err(dev, "Failed to add subdev for source %d", i);
+			v4l2_async_notifier_cleanup(&priv->notifier);
+			return ret;
+		}
+
+		/*
+		 * Balance the reference counting handled through
+		 * v4l2_async_notifier_cleanup()
+		 */
+		fwnode_handle_get(source->fwnode);
+	}
+
+	priv->notifier.ops = &max9286_notify_ops;
+
+	ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier);
+	if (ret) {
+		dev_err(dev, "Failed to register subdev_notifier");
+		v4l2_async_notifier_cleanup(&priv->notifier);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void max9286_v4l2_notifier_unregister(struct max9286_priv *priv)
+{
+	if (!priv->nsources)
+		return;
+
+	v4l2_async_notifier_unregister(&priv->notifier);
+	v4l2_async_notifier_cleanup(&priv->notifier);
+}
+
+static int max9286_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct max9286_priv *priv = sd_to_max9286(sd);
+	struct max9286_source *source;
+	unsigned int i;
+	bool sync = false;
+	int ret;
+
+	if (enable) {
+		/*
+		 * The frame sync between cameras is transmitted across the
+		 * reverse channel as GPIO. We must open all channels while
+		 * streaming to allow this synchronisation signal to be shared.
+		 */
+		max9286_i2c_mux_open(priv);
+
+		/* Start all cameras. */
+		for_each_source(priv, source) {
+			ret = v4l2_subdev_call(source->sd, video, s_stream, 1);
+			if (ret)
+				return ret;
+		}
+
+		ret = max9286_check_video_links(priv);
+		if (ret)
+			return ret;
+
+		/*
+		 * Wait until frame synchronization is locked.
+		 *
+		 * Manual says frame sync locking should take ~6 VTS.
+		 * From practical experience at least 8 are required. Give
+		 * 12 complete frames time (~400ms at 30 fps) to achieve frame
+		 * locking before returning error.
+		 */
+		for (i = 0; i < 40; i++) {
+			if (max9286_read(priv, 0x31) & MAX9286_FSYNC_LOCKED) {
+				sync = true;
+				break;
+			}
+			usleep_range(9000, 11000);
+		}
+
+		if (!sync) {
+			dev_err(&priv->client->dev,
+				"Failed to get frame synchronization\n");
+			return -EXDEV; /* Invalid cross-device link */
+		}
+
+		/*
+		 * Enable CSI output, VC set according to link number.
+		 * Bit 7 must be set (chip manual says it's 0 and reserved).
+		 */
+		max9286_write(priv, 0x15, 0x80 | MAX9286_VCTYPE |
+			      MAX9286_CSIOUTEN | MAX9286_0X15_RESV);
+	} else {
+		max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV);
+
+		/* Stop all cameras. */
+		for_each_source(priv, source)
+			v4l2_subdev_call(source->sd, video, s_stream, 0);
+
+		max9286_i2c_mux_close(priv);
+	}
+
+	return 0;
+}
+
+static int max9286_enum_mbus_code(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->pad || code->index > 0)
+		return -EINVAL;
+
+	code->code = MEDIA_BUS_FMT_UYVY8_2X8;
+
+	return 0;
+}
+
+static struct v4l2_mbus_framefmt *
+max9286_get_pad_format(struct max9286_priv *priv,
+		       struct v4l2_subdev_pad_config *cfg,
+		       unsigned int pad, u32 which)
+{
+	switch (which) {
+	case V4L2_SUBDEV_FORMAT_TRY:
+		return v4l2_subdev_get_try_format(&priv->sd, cfg, pad);
+	case V4L2_SUBDEV_FORMAT_ACTIVE:
+		return &priv->fmt[pad];
+	default:
+		return NULL;
+	}
+}
+
+static int max9286_set_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *format)
+{
+	struct max9286_priv *priv = sd_to_max9286(sd);
+	struct v4l2_mbus_framefmt *cfg_fmt;
+
+	if (format->pad >= MAX9286_SRC_PAD)
+		return -EINVAL;
+
+	/* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */
+	switch (format->format.code) {
+	case MEDIA_BUS_FMT_UYVY8_2X8:
+	case MEDIA_BUS_FMT_VYUY8_2X8:
+	case MEDIA_BUS_FMT_YUYV8_2X8:
+	case MEDIA_BUS_FMT_YVYU8_2X8:
+		break;
+	default:
+		format->format.code = MEDIA_BUS_FMT_YUYV8_2X8;
+		break;
+	}
+
+	cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which);
+	if (!cfg_fmt)
+		return -EINVAL;
+
+	*cfg_fmt = format->format;
+
+	return 0;
+}
+
+static int max9286_get_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *format)
+{
+	struct max9286_priv *priv = sd_to_max9286(sd);
+	struct v4l2_mbus_framefmt *cfg_fmt;
+
+	if (format->pad >= MAX9286_SRC_PAD)
+		return -EINVAL;
+
+	cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which);
+	if (!cfg_fmt)
+		return -EINVAL;
+
+	format->format = *cfg_fmt;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops max9286_video_ops = {
+	.s_stream	= max9286_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops max9286_pad_ops = {
+	.enum_mbus_code = max9286_enum_mbus_code,
+	.get_fmt	= max9286_get_fmt,
+	.set_fmt	= max9286_set_fmt,
+};
+
+static const struct v4l2_subdev_ops max9286_subdev_ops = {
+	.video		= &max9286_video_ops,
+	.pad		= &max9286_pad_ops,
+};
+
+static void max9286_init_format(struct v4l2_mbus_framefmt *fmt)
+{
+	fmt->width		= 1280;
+	fmt->height		= 800;
+	fmt->code		= MEDIA_BUS_FMT_UYVY8_2X8;
+	fmt->colorspace		= V4L2_COLORSPACE_SRGB;
+	fmt->field		= V4L2_FIELD_NONE;
+	fmt->ycbcr_enc		= V4L2_YCBCR_ENC_DEFAULT;
+	fmt->quantization	= V4L2_QUANTIZATION_DEFAULT;
+	fmt->xfer_func		= V4L2_XFER_FUNC_DEFAULT;
+}
+
+static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *format;
+	unsigned int i;
+
+	for (i = 0; i < MAX9286_N_SINKS; i++) {
+		format = v4l2_subdev_get_try_format(subdev, fh->pad, i);
+		max9286_init_format(format);
+	}
+
+	return 0;
+}
+
+static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = {
+	.open = max9286_open,
+};
+
+static int max9286_v4l2_register(struct max9286_priv *priv)
+{
+	struct device *dev = &priv->client->dev;
+	struct fwnode_handle *ep;
+	int ret;
+	int i;
+
+	/* Register v4l2 async notifiers for connected Camera subdevices */
+	ret = max9286_v4l2_notifier_register(priv);
+	if (ret) {
+		dev_err(dev, "Unable to register V4L2 async notifiers\n");
+		return ret;
+	}
+
+	/* Configure V4L2 for the MAX9286 itself */
+
+	v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops);
+	priv->sd.internal_ops = &max9286_subdev_internal_ops;
+	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	v4l2_ctrl_handler_init(&priv->ctrls, 1);
+	/*
+	 * FIXME: Compute the real pixel rate. The 50 MP/s value comes from the
+	 * hardcoded frequency in the BSP CSI-2 receiver driver.
+	 */
+	v4l2_ctrl_new_std(&priv->ctrls, NULL, V4L2_CID_PIXEL_RATE,
+			  50000000, 50000000, 1, 50000000);
+	priv->sd.ctrl_handler = &priv->ctrls;
+	ret = priv->ctrls.error;
+	if (ret)
+		goto err_async;
+
+	priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+
+	priv->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE;
+	for (i = 0; i < MAX9286_SRC_PAD; i++)
+		priv->pads[i].flags = MEDIA_PAD_FL_SINK;
+	ret = media_entity_pads_init(&priv->sd.entity, MAX9286_N_PADS,
+				     priv->pads);
+	if (ret)
+		goto err_async;
+
+	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), MAX9286_SRC_PAD,
+					     0, 0);
+	if (!ep) {
+		dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n");
+		ret = -ENOENT;
+		goto err_async;
+	}
+	priv->sd.fwnode = ep;
+
+	ret = v4l2_async_register_subdev(&priv->sd);
+	if (ret < 0) {
+		dev_err(dev, "Unable to register subdevice\n");
+		goto err_put_node;
+	}
+
+	return 0;
+
+err_put_node:
+	fwnode_handle_put(ep);
+err_async:
+	max9286_v4l2_notifier_unregister(priv);
+
+	return ret;
+}
+
+static void max9286_v4l2_unregister(struct max9286_priv *priv)
+{
+	fwnode_handle_put(priv->sd.fwnode);
+	v4l2_async_unregister_subdev(&priv->sd);
+	max9286_v4l2_notifier_unregister(priv);
+}
+
+/* -----------------------------------------------------------------------------
+ * Probe/Remove
+ */
+
+static int max9286_setup(struct max9286_priv *priv)
+{
+	/*
+	 * Link ordering values for all enabled links combinations. Orders must
+	 * be assigned sequentially from 0 to the number of enabled links
+	 * without leaving any hole for disabled links. We thus assign orders to
+	 * enabled links first, and use the remaining order values for disabled
+	 * links are all links must have a different order value;
+	 */
+	static const u8 link_order[] = {
+		(3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */
+		(3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */
+		(3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */
+		(3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */
+		(3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */
+		(3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */
+		(3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */
+		(3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */
+		(0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */
+		(1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */
+		(1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */
+		(2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */
+		(1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */
+		(2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */
+		(2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */
+		(3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */
+	};
+
+	/*
+	 * Set the I2C bus speed.
+	 *
+	 * Enable I2C Local Acknowledge during the probe sequences of the camera
+	 * only. This should be disabled after the mux is initialised.
+	 */
+	max9286_configure_i2c(priv, true);
+
+	/*
+	 * Reverse channel setup.
+	 *
+	 * - Enable custom reverse channel configuration (through register 0x3f)
+	 *   and set the first pulse length to 35 clock cycles.
+	 * - Increase the reverse channel amplitude to 170mV to accommodate the
+	 *   high threshold enabled by the serializer driver.
+	 */
+	max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35));
+	max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) |
+		      MAX9286_REV_AMP_X);
+	usleep_range(2000, 2500);
+
+	/*
+	 * Enable GMSL links, mask unused ones and autodetect link
+	 * used as CSI clock source.
+	 */
+	max9286_write(priv, 0x00, MAX9286_MSTLINKSEL_AUTO | priv->route_mask);
+	max9286_write(priv, 0x0b, link_order[priv->route_mask]);
+	max9286_write(priv, 0x69, (0xf & ~priv->route_mask));
+
+	/*
+	 * Video format setup:
+	 * Disable CSI output, VC is set according to Link number.
+	 */
+	max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV);
+
+	/* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */
+	max9286_write(priv, 0x12, MAX9286_CSIDBL | MAX9286_DBL |
+		      MAX9286_CSILANECNT(priv->csi2_data_lanes) |
+		      MAX9286_DATATYPE_YUV422_8BIT);
+
+	/* Automatic: FRAMESYNC taken from the slowest Link. */
+	max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ |
+		      MAX9286_FSYNCMETH_AUTO);
+
+	/* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */
+	max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
+		      MAX9286_HVSRC_D14);
+
+	/*
+	 * Wait for 2ms to allow the link to resynchronize after the
+	 * configuration change.
+	 */
+	usleep_range(2000, 5000);
+
+	return 0;
+}
+
+static const struct of_device_id max9286_dt_ids[] = {
+	{ .compatible = "maxim,max9286" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, max9286_dt_ids);
+
+static void max9286_gpio_set(struct gpio_chip *chip,
+			     unsigned int offset, int value)
+{
+	struct max9286_priv *priv = gpiochip_get_data(chip);
+
+	if (value)
+		priv->gpio_state |= BIT(offset);
+	else
+		priv->gpio_state &= ~BIT(offset);
+
+	max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state);
+}
+
+static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct max9286_priv *priv = gpiochip_get_data(chip);
+
+	return priv->gpio_state & BIT(offset);
+}
+
+static int max9286_gpio(struct max9286_priv *priv)
+{
+	struct device *dev = &priv->client->dev;
+	struct gpio_chip *gpio = &priv->gpio;
+	int ret;
+
+	static const char * const names[] = {
+		"GPIO0OUT",
+		"GPIO1OUT",
+	};
+
+	/* Configure the GPIO */
+	gpio->label = dev_name(dev);
+	gpio->parent = dev;
+	gpio->owner = THIS_MODULE;
+	gpio->of_node = dev->of_node;
+	gpio->ngpio = 2;
+	gpio->base = -1;
+	gpio->set = max9286_gpio_set;
+	gpio->get = max9286_gpio_get;
+	gpio->can_sleep = true;
+	gpio->names = names;
+
+	/* GPIO values default to high */
+	priv->gpio_state = BIT(0) | BIT(1);
+
+	ret = devm_gpiochip_add_data(dev, gpio, priv);
+	if (ret)
+		dev_err(dev, "Unable to create gpio_chip\n");
+
+	return ret;
+}
+
+static int max9286_init(struct device *dev)
+{
+	struct max9286_priv *priv;
+	struct i2c_client *client;
+	int ret;
+
+	/* Skip non-max9286 devices. */
+	if (!dev->of_node || !of_match_node(max9286_dt_ids, dev->of_node))
+		return 0;
+
+	client = to_i2c_client(dev);
+	priv = i2c_get_clientdata(client);
+
+	/* Enable the bus power. */
+	ret = regulator_enable(priv->regulator);
+	if (ret < 0) {
+		dev_err(&client->dev, "Unable to turn PoC on\n");
+		return ret;
+	}
+
+	priv->poc_enabled = true;
+
+	ret = max9286_setup(priv);
+	if (ret) {
+		dev_err(dev, "Unable to setup max9286\n");
+		goto err_regulator;
+	}
+
+	/*
+	 * Register all V4L2 interactions for the MAX9286 and notifiers for
+	 * any subdevices connected.
+	 */
+	ret = max9286_v4l2_register(priv);
+	if (ret) {
+		dev_err(dev, "Failed to register with V4L2\n");
+		goto err_regulator;
+	}
+
+	ret = max9286_i2c_mux_init(priv);
+	if (ret) {
+		dev_err(dev, "Unable to initialize I2C multiplexer\n");
+		goto err_v4l2_register;
+	}
+
+	/* Leave the mux channels disabled until they are selected. */
+	max9286_i2c_mux_close(priv);
+
+	return 0;
+
+err_v4l2_register:
+	max9286_v4l2_unregister(priv);
+err_regulator:
+	regulator_disable(priv->regulator);
+	priv->poc_enabled = false;
+
+	return ret;
+}
+
+static void max9286_cleanup_dt(struct max9286_priv *priv)
+{
+	struct max9286_source *source;
+
+	for_each_source(priv, source) {
+		fwnode_handle_put(source->fwnode);
+		source->fwnode = NULL;
+	}
+}
+
+static int max9286_parse_dt(struct max9286_priv *priv)
+{
+	struct device *dev = &priv->client->dev;
+	struct device_node *i2c_mux;
+	struct device_node *node = NULL;
+	unsigned int i2c_mux_mask = 0;
+
+	of_node_get(dev->of_node);
+	i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux");
+	if (!i2c_mux) {
+		dev_err(dev, "Failed to find i2c-mux node\n");
+		return -EINVAL;
+	}
+
+	/* Identify which i2c-mux channels are enabled */
+	for_each_child_of_node(i2c_mux, node) {
+		u32 id = 0;
+
+		of_property_read_u32(node, "reg", &id);
+		if (id >= MAX9286_NUM_GMSL)
+			continue;
+
+		if (!of_device_is_available(node)) {
+			dev_dbg(dev, "Skipping disabled I2C bus port %u\n",
+				id);
+			continue;
+		}
+
+		i2c_mux_mask |= BIT(id);
+	}
+	of_node_put(node);
+	of_node_put(i2c_mux);
+
+	/* Parse the endpoints */
+	for_each_endpoint_of_node(dev->of_node, node) {
+		struct max9286_source *source;
+		struct of_endpoint ep;
+
+		of_graph_parse_endpoint(node, &ep);
+		dev_dbg(dev, "Endpoint %pOF on port %d",
+			ep.local_node, ep.port);
+
+		if (ep.port > MAX9286_NUM_GMSL) {
+			dev_err(dev, "Invalid endpoint %s on port %d",
+				of_node_full_name(ep.local_node), ep.port);
+			continue;
+		}
+
+		/* For the source endpoint just parse the bus configuration. */
+		if (ep.port == MAX9286_SRC_PAD) {
+			struct v4l2_fwnode_endpoint vep = {
+				.bus_type = V4L2_MBUS_CSI2_DPHY
+			};
+			int ret;
+
+			ret = v4l2_fwnode_endpoint_parse(
+					of_fwnode_handle(node), &vep);
+			if (ret) {
+				of_node_put(node);
+				return ret;
+			}
+
+			if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) {
+				dev_err(dev,
+					"Media bus %u type not supported\n",
+					vep.bus_type);
+				v4l2_fwnode_endpoint_free(&vep);
+				of_node_put(node);
+				return -EINVAL;
+			}
+
+			priv->csi2_data_lanes =
+				vep.bus.mipi_csi2.num_data_lanes;
+			v4l2_fwnode_endpoint_free(&vep);
+
+			continue;
+		}
+
+		/* Skip if the corresponding GMSL link is unavailable. */
+		if (!(i2c_mux_mask & BIT(ep.port)))
+			continue;
+
+		if (priv->sources[ep.port].fwnode) {
+			dev_err(dev,
+				"Multiple port endpoints are not supported: %d",
+				ep.port);
+
+			continue;
+		}
+
+		source = &priv->sources[ep.port];
+		source->fwnode = fwnode_graph_get_remote_endpoint(
+						of_fwnode_handle(node));
+		if (!source->fwnode) {
+			dev_err(dev,
+				"Endpoint %pOF has no remote endpoint connection\n",
+				ep.local_node);
+
+			continue;
+		}
+
+		priv->source_mask |= BIT(ep.port);
+		priv->nsources++;
+	}
+	of_node_put(node);
+
+	priv->route_mask = priv->source_mask;
+
+	return 0;
+}
+
+static int max9286_probe(struct i2c_client *client)
+{
+	struct max9286_priv *priv;
+	unsigned int i;
+	int ret;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->client = client;
+	i2c_set_clientdata(client, priv);
+
+	for (i = 0; i < MAX9286_N_SINKS; i++)
+		max9286_init_format(&priv->fmt[i]);
+
+	ret = max9286_parse_dt(priv);
+	if (ret)
+		return ret;
+
+	priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable",
+						   GPIOD_OUT_HIGH);
+	if (IS_ERR(priv->gpiod_pwdn))
+		return PTR_ERR(priv->gpiod_pwdn);
+
+	gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn");
+	gpiod_set_value_cansleep(priv->gpiod_pwdn, 1);
+
+	/* Wait at least 4ms before the I2C lines latch to the address */
+	if (priv->gpiod_pwdn)
+		usleep_range(4000, 5000);
+
+	ret = max9286_gpio(priv);
+	if (ret)
+		return ret;
+
+	priv->regulator = regulator_get(&client->dev, "poc");
+	if (IS_ERR(priv->regulator)) {
+		if (PTR_ERR(priv->regulator) != -EPROBE_DEFER)
+			dev_err(&client->dev,
+				"Unable to get PoC regulator (%ld)\n",
+				PTR_ERR(priv->regulator));
+		ret = PTR_ERR(priv->regulator);
+		priv->regulator = NULL;
+		goto err_free;
+	}
+
+	/*
+	 * We can have multiple MAX9286 instances on the same physical I2C
+	 * bus, and I2C children behind ports of separate MAX9286 instances
+	 * having the same I2C address. As the MAX9286 starts by default with
+	 * all ports enabled, we need to disable all ports on all MAX9286
+	 * instances before proceeding to further initialize the devices and
+	 * instantiate children.
+	 *
+	 * Start by just disabling all channels on the current device. Then,
+	 * if all other MAX9286 on the parent bus have been probed, proceed
+	 * to initialize them all, including the current one.
+	 */
+	max9286_i2c_mux_close(priv);
+
+	/*
+	 * The MAX9286 initialises with auto-acknowledge enabled by default.
+	 * This means that if multiple MAX9286 devices are connected to an I2C
+	 * bus, another MAX9286 could ack I2C transfers meant for a device on
+	 * the other side of the GMSL links for this MAX9286 (such as a
+	 * MAX9271). To prevent that disable auto-acknowledge early on; it
+	 * will be enabled later as needed.
+	 */
+	max9286_configure_i2c(priv, false);
+
+	ret = max9286_init(&client->dev);
+	if (ret < 0)
+		goto err_regulator;
+
+	return 0;
+
+err_regulator:
+	regulator_put(priv->regulator);
+	max9286_i2c_mux_close(priv);
+	max9286_configure_i2c(priv, false);
+err_free:
+	max9286_cleanup_dt(priv);
+	kfree(priv);
+
+	return ret;
+}
+
+static int max9286_remove(struct i2c_client *client)
+{
+	struct max9286_priv *priv = i2c_get_clientdata(client);
+
+	i2c_mux_del_adapters(priv->mux);
+
+	max9286_v4l2_unregister(priv);
+
+	if (priv->poc_enabled)
+		regulator_disable(priv->regulator);
+	regulator_put(priv->regulator);
+
+	max9286_cleanup_dt(priv);
+
+	gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
+
+	kfree(priv);
+
+	return 0;
+}
+
+static const struct i2c_device_id max9286_id[] = {
+	{ "max9286", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max9286_id);
+
+static struct i2c_driver max9286_i2c_driver = {
+	.driver	= {
+		.name		= "max9286",
+		.of_match_table	= of_match_ptr(max9286_dt_ids),
+	},
+	.probe_new	= max9286_probe,
+	.remove		= max9286_remove,
+	.id_table	= max9286_id,
+};
+
+module_i2c_driver(max9286_i2c_driver);
+
+MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver");
+MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov");
+MODULE_LICENSE("GPL");
-- 
2.26.0

[v8-rc1 02/20] fixup! media: i2c: Add MAX9286 driver

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

---
 drivers/media/i2c/max9286.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index a20829297ef6..cb58782e5143 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -463,9 +463,9 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
 		subdev->name, src_pad, index);
 
 	/*
-	 * We can only register v4l2_async_notifiers which do not provide a
+	 * We can only register v4l2_async_notifiers, which do not provide a
 	 * means to register a complete callback. bound_sources allows us to
-	 * identify when all remove serializers have completed their probe.
+	 * identify when all remote serializers have completed their probe.
 	 */
 	if (priv->bound_sources != priv->source_mask)
 		return 0;
-- 
2.26.0

[v8-rc1 03/20] squash!: max9286: Rebase on latest media/master

[Jacopo Mondi]

Adapt Kconfig to latest upstream changes
Fixes: 32a363d0b0b1 ("media: Kconfig files: use select for V4L2 subdevs and MC")
---
 drivers/media/i2c/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 04186787a2f0..5d810f6f230e 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -467,8 +467,9 @@ config VIDEO_VPX3220
 config VIDEO_MAX9286
 	tristate "Maxim MAX9286 GMSL deserializer support"
 	depends on I2C && I2C_MUX
-	depends on VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
 	select V4L2_FWNODE
+	select VIDEO_V4L2_SUBDEV_API
+	select MEDIA_CONTROLLER
 	help
 	  This driver supports the Maxim MAX9286 GMSL deserializer.
 
-- 
2.26.0

[v8-rc1 04/20] squash! max9286: Update the bound_sources mask on unbind

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

The bound_sources bit mask tracks sources which have been successfully
bound through the v4l2 async notifier system.

Ensure that the mask is updated accordingly when unbinding.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/media/i2c/max9286.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index cb58782e5143..b84d2daa6561 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -493,9 +493,12 @@ static void max9286_notify_unbind(struct v4l2_async_notifier *notifier,
 				  struct v4l2_subdev *subdev,
 				  struct v4l2_async_subdev *asd)
 {
+	struct max9286_priv *priv = sd_to_max9286(notifier->sd);
 	struct max9286_source *source = asd_to_max9286_source(asd);
+	unsigned int index = to_index(priv, source);
 
 	source->sd = NULL;
+	priv->bound_sources &= ~BIT(index);
 }
 
 static const struct v4l2_async_notifier_operations max9286_notify_ops = {
-- 
2.26.0

[v8-rc1 05/20] squash! max9286: convert probe kzalloc

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

v8:
 - Convert probe kzalloc usage to devm_ variant
---
 drivers/media/i2c/max9286.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index b84d2daa6561..0a43137b8112 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -1155,7 +1155,7 @@ static int max9286_probe(struct i2c_client *client)
 	unsigned int i;
 	int ret;
 
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
@@ -1232,7 +1232,6 @@ static int max9286_probe(struct i2c_client *client)
 	max9286_configure_i2c(priv, false);
 err_free:
 	max9286_cleanup_dt(priv);
-	kfree(priv);
 
 	return ret;
 }
@@ -1253,8 +1252,6 @@ static int max9286_remove(struct i2c_client *client)
 
 	gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
 
-	kfree(priv);
-
 	return 0;
 }
 
-- 
2.26.0

[v8-rc1 06/20] squash! max9286: Fix cleanup path from GPIO powerdown

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

 - Fix up cleanup path from GPIO PowerDown registration
---
 drivers/media/i2c/max9286.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 0a43137b8112..cc99740b34c5 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -1171,8 +1171,10 @@ static int max9286_probe(struct i2c_client *client)
 
 	priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable",
 						   GPIOD_OUT_HIGH);
-	if (IS_ERR(priv->gpiod_pwdn))
-		return PTR_ERR(priv->gpiod_pwdn);
+	if (IS_ERR(priv->gpiod_pwdn)) {
+		ret = PTR_ERR(priv->gpiod_pwdn);
+		goto err_cleanup_dt;
+	}
 
 	gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn");
 	gpiod_set_value_cansleep(priv->gpiod_pwdn, 1);
@@ -1193,7 +1195,7 @@ static int max9286_probe(struct i2c_client *client)
 				PTR_ERR(priv->regulator));
 		ret = PTR_ERR(priv->regulator);
 		priv->regulator = NULL;
-		goto err_free;
+		goto err_cleanup_dt;
 	}
 
 	/*
@@ -1230,7 +1232,7 @@ static int max9286_probe(struct i2c_client *client)
 	regulator_put(priv->regulator);
 	max9286_i2c_mux_close(priv);
 	max9286_configure_i2c(priv, false);
-err_free:
+err_cleanup_dt:
 	max9286_cleanup_dt(priv);
 
 	return ret;
@@ -1248,10 +1250,10 @@ static int max9286_remove(struct i2c_client *client)
 		regulator_disable(priv->regulator);
 	regulator_put(priv->regulator);
 
-	max9286_cleanup_dt(priv);
-
 	gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
 
+	max9286_cleanup_dt(priv);
+
 	return 0;
 }
 
-- 
2.26.0

[v8-rc1 07/20] squash! max9286: cleanup GPIO device registration fail path

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

 - cleanup GPIO device registration fail path
---
 drivers/media/i2c/max9286.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index cc99740b34c5..d0749c537152 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -1185,7 +1185,7 @@ static int max9286_probe(struct i2c_client *client)
 
 	ret = max9286_gpio(priv);
 	if (ret)
-		return ret;
+		goto err_powerdown;
 
 	priv->regulator = regulator_get(&client->dev, "poc");
 	if (IS_ERR(priv->regulator)) {
@@ -1194,8 +1194,7 @@ static int max9286_probe(struct i2c_client *client)
 				"Unable to get PoC regulator (%ld)\n",
 				PTR_ERR(priv->regulator));
 		ret = PTR_ERR(priv->regulator);
-		priv->regulator = NULL;
-		goto err_cleanup_dt;
+		goto err_powerdown;
 	}
 
 	/*
@@ -1232,6 +1231,8 @@ static int max9286_probe(struct i2c_client *client)
 	regulator_put(priv->regulator);
 	max9286_i2c_mux_close(priv);
 	max9286_configure_i2c(priv, false);
+err_powerdown:
+	gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
 err_cleanup_dt:
 	max9286_cleanup_dt(priv);
 
-- 
2.26.0

[v8-rc1 08/20] squash! max9286: Convert to use devm_regulator_get()

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

 - Convert to use devm_regulator_get()
---
 drivers/media/i2c/max9286.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index d0749c537152..08fd946c25f0 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -1187,7 +1187,7 @@ static int max9286_probe(struct i2c_client *client)
 	if (ret)
 		goto err_powerdown;
 
-	priv->regulator = regulator_get(&client->dev, "poc");
+	priv->regulator = devm_regulator_get(&client->dev, "poc");
 	if (IS_ERR(priv->regulator)) {
 		if (PTR_ERR(priv->regulator) != -EPROBE_DEFER)
 			dev_err(&client->dev,
@@ -1249,7 +1249,6 @@ static int max9286_remove(struct i2c_client *client)
 
 	if (priv->poc_enabled)
 		regulator_disable(priv->regulator);
-	regulator_put(priv->regulator);
 
 	gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
 
-- 
2.26.0

[v8-rc1 09/20] squash! max9286: Fit max9286_parse_dt print on one line

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

 - Fit max9286_parse_dt print on one line
---
 drivers/media/i2c/max9286.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 08fd946c25f0..8f7e8928af56 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -1061,8 +1061,7 @@ static int max9286_parse_dt(struct max9286_priv *priv)
 			continue;
 
 		if (!of_device_is_available(node)) {
-			dev_dbg(dev, "Skipping disabled I2C bus port %u\n",
-				id);
+			dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id);
 			continue;
 		}
 
-- 
2.26.0

[v8-rc1 10/20] squash! max9286: Move multi-device workarounds out of upstream

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

 - Move multi-device workarounds out of upstream driver
---
 drivers/media/i2c/max9286.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 8f7e8928af56..3fd70ddbcce8 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -911,12 +911,6 @@ static int max9286_setup(struct max9286_priv *priv)
 	return 0;
 }
 
-static const struct of_device_id max9286_dt_ids[] = {
-	{ .compatible = "maxim,max9286" },
-	{},
-};
-MODULE_DEVICE_TABLE(of, max9286_dt_ids);
-
 static void max9286_gpio_set(struct gpio_chip *chip,
 			     unsigned int offset, int value)
 {
@@ -976,10 +970,6 @@ static int max9286_init(struct device *dev)
 	struct i2c_client *client;
 	int ret;
 
-	/* Skip non-max9286 devices. */
-	if (!dev->of_node || !of_match_node(max9286_dt_ids, dev->of_node))
-		return 0;
-
 	client = to_i2c_client(dev);
 	priv = i2c_get_clientdata(client);
 
@@ -1256,6 +1246,12 @@ static int max9286_remove(struct i2c_client *client)
 	return 0;
 }
 
+static const struct of_device_id max9286_dt_ids[] = {
+	{ .compatible = "maxim,max9286" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, max9286_dt_ids);
+
 static const struct i2c_device_id max9286_id[] = {
 	{ "max9286", 0 },
 	{ }
-- 
2.26.0

[v8-rc1 11/20] squash! max9286: Remove I2C mod-table

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

'Technically' this table is still required for module autoloading, until
some solution such as [0] is merged:

[0] [PATCH RFC] modpost: Support I2C Aliases from OF tables

https://lore.kernel.org/lkml/20190710193918.31135-1-kieran.bingham+renesas@ideasonboard.com/

However in practice, I think the only restriction that gets lost is
device instantiation from sysfs, which wouldn't really work for this
driver anyway, because it requires a description of connected endpoints.

So - it should be quite safe to drop it.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/media/i2c/max9286.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 3fd70ddbcce8..84173b8c2706 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -1252,12 +1252,6 @@ static const struct of_device_id max9286_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, max9286_dt_ids);
 
-static const struct i2c_device_id max9286_id[] = {
-	{ "max9286", 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, max9286_id);
-
 static struct i2c_driver max9286_i2c_driver = {
 	.driver	= {
 		.name		= "max9286",
@@ -1265,7 +1259,6 @@ static struct i2c_driver max9286_i2c_driver = {
 	},
 	.probe_new	= max9286_probe,
 	.remove		= max9286_remove,
-	.id_table	= max9286_id,
 };
 
 module_i2c_driver(max9286_i2c_driver);
-- 
2.26.0

[v8-rc1 12/20] sqaush! max9286: Lock format changes

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Provide a mutex to protect against format changes on the pads.  The
mutex can also be used to protect against control changes, or other
userspace facing interactions as necessary

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/media/i2c/max9286.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 84173b8c2706..49b4d1830747 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -18,6 +18,7 @@
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/of_graph.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
@@ -157,6 +158,9 @@ struct max9286_priv {
 
 	struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS];
 
+	/* Protects controls and fmt structures */
+	struct mutex mutex;
+
 	unsigned int nsources;
 	unsigned int source_mask;
 	unsigned int route_mask;
@@ -680,7 +684,9 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
 	if (!cfg_fmt)
 		return -EINVAL;
 
+	mutex_lock(&priv->mutex);
 	*cfg_fmt = format->format;
+	mutex_unlock(&priv->mutex);
 
 	return 0;
 }
@@ -699,7 +705,9 @@ static int max9286_get_fmt(struct v4l2_subdev *sd,
 	if (!cfg_fmt)
 		return -EINVAL;
 
+	mutex_lock(&priv->mutex);
 	format->format = *cfg_fmt;
+	mutex_unlock(&priv->mutex);
 
 	return 0;
 }
@@ -1148,6 +1156,8 @@ static int max9286_probe(struct i2c_client *client)
 	if (!priv)
 		return -ENOMEM;
 
+	mutex_init(&priv->mutex);
+
 	priv->client = client;
 	i2c_set_clientdata(client, priv);
 
-- 
2.26.0

[v8-rc1 13/20] squash! max9286: Implement Pixelrate control

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Determine the (CSI2) pixel rate control by providing a control to read,
and checking the rate from the upstream camera sensors, and their
appropriate formats.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/media/i2c/max9286.c | 38 +++++++++++++++++++++++++++++++------
 1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 49b4d1830747..2d71205a1aad 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -155,6 +155,7 @@ struct max9286_priv {
 	bool mux_open;
 
 	struct v4l2_ctrl_handler ctrls;
+	struct v4l2_ctrl *pixelrate;
 
 	struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS];
 
@@ -429,6 +430,11 @@ static int max9286_check_config_link(struct max9286_priv *priv,
  * V4L2 Subdev
  */
 
+static int max9286_set_pixelrate(struct max9286_priv *priv, s64 rate)
+{
+	return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, rate);
+}
+
 static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
 				struct v4l2_subdev *subdev,
 				struct v4l2_async_subdev *asd)
@@ -664,6 +670,7 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
 {
 	struct max9286_priv *priv = sd_to_max9286(sd);
 	struct v4l2_mbus_framefmt *cfg_fmt;
+	s64 pixelrate;
 
 	if (format->pad >= MAX9286_SRC_PAD)
 		return -EINVAL;
@@ -688,6 +695,12 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
 	*cfg_fmt = format->format;
 	mutex_unlock(&priv->mutex);
 
+	/* Update pixel rate for the CSI2 receiver */
+	pixelrate = cfg_fmt->width * cfg_fmt->height
+		  * priv->nsources * 30 /*FPS*/;
+
+	max9286_set_pixelrate(priv, pixelrate);
+
 	return 0;
 }
 
@@ -756,6 +769,20 @@ static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = {
 	.open = max9286_open,
 };
 
+static int max9286_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	switch (ctrl->id) {
+	case V4L2_CID_PIXEL_RATE:
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct v4l2_ctrl_ops max9286_ctrl_ops = {
+	.s_ctrl	= max9286_s_ctrl,
+};
+
 static int max9286_v4l2_register(struct max9286_priv *priv)
 {
 	struct device *dev = &priv->client->dev;
@@ -777,12 +804,11 @@ static int max9286_v4l2_register(struct max9286_priv *priv)
 	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 
 	v4l2_ctrl_handler_init(&priv->ctrls, 1);
-	/*
-	 * FIXME: Compute the real pixel rate. The 50 MP/s value comes from the
-	 * hardcoded frequency in the BSP CSI-2 receiver driver.
-	 */
-	v4l2_ctrl_new_std(&priv->ctrls, NULL, V4L2_CID_PIXEL_RATE,
-			  50000000, 50000000, 1, 50000000);
+	priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls,
+					    &max9286_ctrl_ops,
+					    V4L2_CID_PIXEL_RATE,
+					    1, INT_MAX, 1, 50000000);
+
 	priv->sd.ctrl_handler = &priv->ctrls;
 	ret = priv->ctrls.error;
 	if (ret)
-- 
2.26.0

[v8-rc1 14/20] squash! max9286: Calculate pixel rate

[Jacopo Mondi]

Calculate the CSI-2 transmitter pixel rate using the one reported from
sources.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/media/i2c/max9286.c | 50 +++++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 10 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 2d71205a1aad..3ef74ba10074 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -430,9 +430,46 @@ static int max9286_check_config_link(struct max9286_priv *priv,
  * V4L2 Subdev
  */
 
-static int max9286_set_pixelrate(struct max9286_priv *priv, s64 rate)
+static int max9286_set_pixelrate(struct max9286_priv *priv)
 {
-	return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, rate);
+	struct max9286_source *source = NULL;
+	u64 pixelrate = 0;
+
+	for_each_source(priv, source) {
+		struct v4l2_ctrl *ctrl;
+		u64 source_rate = 0;
+
+		/* Pixel rate is mandatory to be reported by sources. */
+		ctrl = v4l2_ctrl_find(source->sd->ctrl_handler,
+				      V4L2_CID_PIXEL_RATE);
+		if (!ctrl) {
+			pixelrate = 0;
+			break;
+		}
+
+		/* All source must report the same pixel rate. */
+		source_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
+		if (!pixelrate) {
+			pixelrate = source_rate;
+		} else if (pixelrate != source_rate) {
+			dev_err(&priv->client->dev,
+				"Unable to calculate pixel rate\n");
+			return -EINVAL;
+		}
+	}
+
+	if (!pixelrate) {
+		dev_err(&priv->client->dev,
+			"No pixel rate control available in sources\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * The CSI-2 transmitter pixel rate is the single source rate multiplied
+	 * by the number of available sources.
+	 */
+	return v4l2_ctrl_s_ctrl_int64(priv->pixelrate,
+				      pixelrate * priv->nsources);
 }
 
 static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
@@ -496,7 +533,7 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
 	 */
 	max9286_configure_i2c(priv, false);
 
-	return 0;
+	return max9286_set_pixelrate(priv);
 }
 
 static void max9286_notify_unbind(struct v4l2_async_notifier *notifier,
@@ -670,7 +707,6 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
 {
 	struct max9286_priv *priv = sd_to_max9286(sd);
 	struct v4l2_mbus_framefmt *cfg_fmt;
-	s64 pixelrate;
 
 	if (format->pad >= MAX9286_SRC_PAD)
 		return -EINVAL;
@@ -695,12 +731,6 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
 	*cfg_fmt = format->format;
 	mutex_unlock(&priv->mutex);
 
-	/* Update pixel rate for the CSI2 receiver */
-	pixelrate = cfg_fmt->width * cfg_fmt->height
-		  * priv->nsources * 30 /*FPS*/;
-
-	max9286_set_pixelrate(priv, pixelrate);
-
 	return 0;
 }
 
-- 
2.26.0

[v8-rc1 15/20] squash! max9286: Disable overlap window

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

---
v2:
  [Jacopo]
  - Write register 0x63 and 0x64 directly as going through the function
    breaks RDACM21 operations
---
 drivers/media/i2c/max9286.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 3ef74ba10074..e0c637d4a7de 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -966,6 +966,18 @@ static int max9286_setup(struct max9286_priv *priv)
 	max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
 		      MAX9286_HVSRC_D14);
 
+	/*
+	 * The overlap window seems to provide additional validation by tracking
+	 * the delay between vsync and frame sync, generating an error if the
+	 * delay is bigger than the programmed window, though it's not yet clear
+	 * what value should be set.
+	 *
+	 * As it's an optional value and can be disabled, we do so by setting
+	 * a 0 overlap value.
+	 */
+	max9286_write(priv, 0x63, 0);
+	max9286_write(priv, 0x64, 0);
+
 	/*
 	 * Wait for 2ms to allow the link to resynchronize after the
 	 * configuration change.
-- 
2.26.0

[v8-rc1 16/20] sqaush! max9286: Describe pad index usage

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Sakari commented that the sink/source pad indexes are not the same as
the OF port numbers. We define them such that they match, so that they
can be used interchangably - but of course they are not the 'same
thing'. Document this in a comment at the definition of the pad sizings.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/media/i2c/max9286.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index e0c637d4a7de..6d63b4ca0a42 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -125,6 +125,10 @@
 #define MAX9286_AUTOMASKEN		BIT(4)
 #define MAX9286_MASKLINK(n)		((n) << 0)
 
+/*
+ * The sink and source pads are created to match the OF graph port numbers so
+ * that their indexes can be used interchangeably.
+ */
 #define MAX9286_NUM_GMSL		4
 #define MAX9286_N_SINKS			4
 #define MAX9286_N_PADS			5
-- 
2.26.0

[v8-rc1 17/20] sqaush! max9286: Remove poc_enabled workaround

[Jacopo Mondi]

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

This boolean is a flag used to handle the regulator when our
multi-max9286 workaround is in place.  It shouldn't be in the upstream
driver, and is moved out.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/media/i2c/max9286.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 6d63b4ca0a42..69e81b879a9b 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -149,7 +149,6 @@ struct max9286_priv {
 	struct v4l2_subdev sd;
 	struct media_pad pads[MAX9286_N_PADS];
 	struct regulator *regulator;
-	bool poc_enabled;
 
 	struct gpio_chip gpio;
 	u8 gpio_state;
@@ -1060,8 +1059,6 @@ static int max9286_init(struct device *dev)
 		return ret;
 	}
 
-	priv->poc_enabled = true;
-
 	ret = max9286_setup(priv);
 	if (ret) {
 		dev_err(dev, "Unable to setup max9286\n");
@@ -1093,7 +1090,6 @@ static int max9286_init(struct device *dev)
 	max9286_v4l2_unregister(priv);
 err_regulator:
 	regulator_disable(priv->regulator);
-	priv->poc_enabled = false;
 
 	return ret;
 }
@@ -1318,8 +1314,7 @@ static int max9286_remove(struct i2c_client *client)
 
 	max9286_v4l2_unregister(priv);
 
-	if (priv->poc_enabled)
-		regulator_disable(priv->regulator);
+	regulator_disable(priv->regulator);
 
 	gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
 
-- 
2.26.0

[v8-rc1 18/20] squash! max9286: Put of node on error

[Jacopo Mondi]

Put the device of node in case of dt parsing error.

Fixes: 9eed4185c7a0 ("media: i2c: Add MAX9286 driver")
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/media/i2c/max9286.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 69e81b879a9b..ccd9041b25e7 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -1115,6 +1115,7 @@ static int max9286_parse_dt(struct max9286_priv *priv)
 	i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux");
 	if (!i2c_mux) {
 		dev_err(dev, "Failed to find i2c-mux node\n");
+		of_node_put(dev->of_node);
 		return -EINVAL;
 	}
 
@@ -1162,6 +1163,7 @@ static int max9286_parse_dt(struct max9286_priv *priv)
 					of_fwnode_handle(node), &vep);
 			if (ret) {
 				of_node_put(node);
+				of_node_put(dev->of_node);
 				return ret;
 			}
 
@@ -1171,6 +1173,7 @@ static int max9286_parse_dt(struct max9286_priv *priv)
 					vep.bus_type);
 				v4l2_fwnode_endpoint_free(&vep);
 				of_node_put(node);
+				of_node_put(dev->of_node);
 				return -EINVAL;
 			}
 
@@ -1208,6 +1211,7 @@ static int max9286_parse_dt(struct max9286_priv *priv)
 		priv->nsources++;
 	}
 	of_node_put(node);
+	of_node_put(dev->of_node);
 
 	priv->route_mask = priv->source_mask;
 
-- 
2.26.0

[v8-rc1 19/20] dt-bindings: media: i2c: Add bindings for IMI RDACM2x

[Jacopo Mondi]

The IMI RDACM20 and IMI RDACM21 are Gigabit Multimedia Serial Link (GMSL) camera
capable of transmitting video and I2C control messages on a coax cable
physical link for automotive applications.

Document their device tree bindings.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---
v2:
 - Provide imi vendor prefix
 - Fix minor spelling

v3:
 - update binding descriptions

v4:
 - No change

v5:
 - Specify optional third reg address for the MCU

v7:
 [Jacopo]
 - Rename to imi,rdacm2x-gmsl.yaml
 - Exand bindings to describe RDACM21

v8:
 - no changes

---
 .../bindings/media/i2c/imi,rdacm2x-gmsl.yaml  | 161 ++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 2 files changed, 163 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml b/Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
new file mode 100644
index 000000000000..8476e99b46b5
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
@@ -0,0 +1,161 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+# Copyright (C) 2019 Renesas Electronics Corp.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/imi,rdacm2x-gmsl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title:  IMI D&D RDACM20 and RDACM21 Automotive Camera Platforms
+
+maintainers:
+  - Jacopo Mondi <jacopo+renesas@jmondi.org>
+  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
+  - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
+  - Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
+
+description: -|
+  The IMI D&D RDACM20 and RDACM21 are GMSL-compatible camera designed for
+  automotive applications.
+
+  The RDACM20 camera module encloses a Maxim Integrated MAX9271 GMSL serializer,
+  coupled with an OV10635 image sensor and an embedded MCU. Both the MCU and
+  the image sensor are connected to the serializer local I2C bus and are
+  accessible by the host SoC by direct addressing.
+
+  The RDACM21 camera module encloses the same serializer, coupled with an
+  OV10640 image sensor and an OV490 ISP. Only the OV490 ISP is interfaced to
+  the serializer local I2C bus while the image sensor is not accessible from
+  the host SoC.
+
+  They both connect to a remote GMSL endpoint through a coaxial cable.
+
+                                                   IMI RDACM20
+  +---------------+                        +--------------------------------+
+  |      GMSL     |   <- Video Stream      |       <- Video--------\        |
+  |               |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV10635 |
+  | de-serializer |   <- I2C messages ->   |                   \<-->MCU     |
+  +---------------+                        +--------------------------------+
+
+                                                   IMI RDACM21
+  +---------------+                        +--------------------------------+
+  |      GMSL     |   <- Video Stream      |       <- Video--------\        |
+  |               |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV490   |
+  |               |   <- I2C messages ->   |                          |     |
+  | de-serializer |                        |          OV10640 <-------|     |
+  +---------------+                        +--------------------------------+
+
+  Both camera modules serialize video data generated by the embedded camera
+  sensor on the GMSL serial channel to a remote GMSL de-serializer. They also
+  receive and transmit I2C messages encapsulated and transmitted on the GMSL
+  bidirectional control channel.
+
+  All I2C traffic received on the GMSL link not directed to the serializer is
+  propagated on the local I2C bus to the remote device there connected. All the
+  I2C traffic generated on the local I2C bus not directed to the serializer is
+  propagated to the remote de-serializer encapsulated in the GMSL control
+  channel.
+
+  The RDACM20 and RDACM21 DT node should be a direct child of the GMSL
+  deserializer's I2C bus corresponding to the GMSL link that the camera is
+  attached to.
+
+properties:
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  compatible:
+    oneOf:
+      - items:
+        - enum:
+          - imi,rdacm20
+          - imi,rdacm21
+
+  reg:
+    description: -|
+      I2C device addresses, the first to be assigned to the serializer, the
+      following ones to be assigned to the remote devices.
+
+      For RDACM20 the second entry of the property is assigned to the
+      OV10635 image sensor and the optional third one to the embedded MCU.
+
+      For RDACM21 the second entry is assigned to the OV490 ISP and the optional
+      third one ignored.
+
+    minItems: 2
+    maxItems: 3
+
+  port:
+    type: object
+    additionalProperties: false
+    description: -|
+      Connection to the remote GMSL endpoint are modelled using the OF graph
+      bindings in accordance with the video interface bindings defined in
+      Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+      The device node contains a single "port" child node with a single
+      "endpoint" sub-device.
+
+    properties:
+      endpoint:
+        type: object
+        additionalProperties: false
+
+        properties:
+          remote-endpoint:
+            description: -|
+              phandle to the remote GMSL endpoint sub-node in the remote node
+              port.
+            maxItems: 1
+
+        required:
+          - remote-endpoint
+
+    required:
+      - endpoint
+
+required:
+  - compatible
+  - reg
+  - port
+
+examples:
+  - |
+    i2c@e66d8000 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      reg = <0 0xe66d8000 0 0x40>;
+
+      camera@31 {
+        compatible = "imi,rdacm20";
+        reg = <0x31>, <0x41>, <0x51>;
+
+        port {
+          rdacm20_out0: endpoint {
+            remote-endpoint = <&max9286_in0>;
+          };
+        };
+      };
+    };
+
+  - |
+    i2c@e66d8000 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      reg = <0 0xe66d8000 0 0x40>;
+
+      camera@31 {
+        compatible = "imi,rdacm21";
+        reg = <0x31>, <0x41>;
+
+        port {
+          rdacm21_out0: endpoint {
+            remote-endpoint = <&max9286_in0>;
+          };
+        };
+      };
+    };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index d3891386d671..dcbecdc58731 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -453,6 +453,8 @@ patternProperties:
     description: Ingenieurburo Fur Ic-Technologie (I/F/I)
   "^ilitek,.*":
     description: ILI Technology Corporation (ILITEK)
+  "^imi,.*":
+    description: Integrated Micro-Electronics Inc.
   "^img,.*":
     description: Imagination Technologies Ltd.
   "^incircuit,.*":
--
2.26.0

[v8-rc1 20/20] media: i2c: Add RDACM20 driver

[Jacopo Mondi]

The RDACM20 is a GMSL camera supporting 1280x800 resolution images
developed by IMI based on an Omnivision 10635 sensor and a Maxim MAX9271
GMSL serializer.

The GMSL link carries power, control (I2C) and video data over a
single coax cable.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>

---
v2:
 - Fix MAINTAINERS entry

v3:
 - Use new V4L2_MBUS_CSI2_DPHY bus type
 - Remove 'always zero' error print
 - Fix module description

v5:
 - use sleep rather than busy loops for 10 ms delays
 - Return ov10635_set_regs directly
 - Use devm_kzalloc instead of kzalloc in probe()
 - Or in the flags: dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE
 - Ensure v4l2_ctrl_handler_free() is called
 - rdacm20_probe converted to use .probe_new and drop i2c device id
   tables
 - Remove rdacm20_g_mbus_config

v7:
 - Use new i2c_new_dummy_device API
---
 MAINTAINERS                 |  12 +
 drivers/media/i2c/Kconfig   |  13 +
 drivers/media/i2c/Makefile  |   2 +
 drivers/media/i2c/max9271.c | 330 ++++++++++++++++++
 drivers/media/i2c/max9271.h | 224 ++++++++++++
 drivers/media/i2c/rdacm20.c | 668 ++++++++++++++++++++++++++++++++++++
 6 files changed, 1249 insertions(+)
 create mode 100644 drivers/media/i2c/max9271.c
 create mode 100644 drivers/media/i2c/max9271.h
 create mode 100644 drivers/media/i2c/rdacm20.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 242ec17644c3..47930cd43ef3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14197,6 +14197,18 @@ S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
 F:	tools/testing/selftests/rcutorture
 
+RDACM20 Camera Sensor
+M:	Jacopo Mondi <jacopo+renesas@jmondi.org>
+M:	Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
+M:	Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
+M:	Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
+F:	drivers/media/i2c/rdacm20.c
+F:	drivers/media/i2c/max9271.c
+F:	drivers/media/i2c/max9271.h
+
 RDC R-321X SoC
 M:	Florian Fainelli <florian@openwrt.org>
 S:	Maintained
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 5d810f6f230e..e5d6dced20e0 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -1156,6 +1156,19 @@ config VIDEO_NOON010PC30
 
 source "drivers/media/i2c/m5mols/Kconfig"
 
+config VIDEO_RDACM20
+	tristate "IMI RDACM20 camera support"
+	depends on I2C
+	select V4L2_FWNODE
+	select VIDEO_V4L2_SUBDEV_API
+	select MEDIA_CONTROLLER
+	help
+	  This driver supports the IMI RDACM20 GMSL camera, used in
+	  ADAS systems.
+
+	  This camera should be used in conjunction with a GMSL
+	  deserialiser such as the MAX9286.
+
 config VIDEO_RJ54N1
 	tristate "Sharp RJ54N1CB0C sensor support"
 	depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 29379008d624..93baaca8469e 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -119,5 +119,7 @@ obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
 obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
 obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
 obj-$(CONFIG_VIDEO_MAX9286)	+= max9286.o
+rdacm20-camera_module-objs	:= rdacm20.o max9271.o
+obj-$(CONFIG_VIDEO_RDACM20)	+= rdacm20-camera_module.o
 
 obj-$(CONFIG_SDR_MAX2175) += max2175.o
diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c
new file mode 100644
index 000000000000..0fde36e9a8c7
--- /dev/null
+++ b/drivers/media/i2c/max9271.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017-2020 Jacopo Mondi
+ * Copyright (C) 2017-2020 Kieran Bingham
+ * Copyright (C) 2017-2020 Laurent Pinchart
+ * Copyright (C) 2017-2020 Niklas Söderlund
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ * Copyright (C) 2015 Cogent Embedded, Inc.
+ *
+ * This file exports functions to control Maxim MAX9271 GMSL serializer
+ * chip. This is not a self-contained driver, as MAX9271 is usually embedded in
+ * camera modules with at least one image sensor and optional additional
+ * components, such as uController units or ISPs/DSPs.
+ *
+ * Drivers for the camera modules (ie rdacm20/21) are expected to use functions
+ * exported from this library driver to maximize code re-use across.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+
+#include "max9271.h"
+
+static int max9271_read(struct max9271_device *dev, u8 reg)
+{
+	int ret;
+
+	dev_dbg(&dev->client->dev, "%s(0x%02x)\n", __func__, reg);
+
+	ret = i2c_smbus_read_byte_data(dev->client, reg);
+	if (ret < 0)
+		dev_dbg(&dev->client->dev,
+			"%s: register 0x%02x read failed (%d)\n",
+			__func__, reg, ret);
+
+	return ret;
+}
+
+static int max9271_write(struct max9271_device *dev, u8 reg, u8 val)
+{
+	int ret;
+
+	dev_dbg(&dev->client->dev, "%s(0x%02x, 0x%02x)\n", __func__, reg, val);
+
+	ret = i2c_smbus_write_byte_data(dev->client, reg, val);
+	if (ret < 0)
+		dev_err(&dev->client->dev,
+			"%s: register 0x%02x write failed (%d)\n",
+			__func__, reg, ret);
+
+	return ret;
+}
+
+/*
+ * max9271_pclk_detect() - Detect valid pixel clock from image sensor
+ *
+ * Wait up to 10ms for a valid pixel clock.
+ *
+ * Returns 0 for success, < 0 for pixel clock not properly detected
+ */
+static int max9271_pclk_detect(struct max9271_device *dev)
+{
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < 100; i++) {
+		ret = max9271_read(dev, 0x15);
+		if (ret < 0)
+			return ret;
+
+		if (ret & MAX9271_PCLKDET)
+			return 0;
+
+		usleep_range(50, 100);
+	}
+
+	dev_err(&dev->client->dev, "Unable to detect valid pixel clock\n");
+	return -EIO;
+}
+
+int max9271_set_serial_link(struct max9271_device *dev, bool enable)
+{
+	int ret;
+	u8 val = MAX9271_REVCCEN | MAX9271_FWDCCEN;
+
+	if (enable) {
+		ret = max9271_pclk_detect(dev);
+		if (ret)
+			return ret;
+
+		val |= MAX9271_SEREN;
+	} else {
+		val |= MAX9271_CLINKEN;
+	}
+
+	/*
+	 * The serializer temporarily disables the reverse control channel for
+	 * 350µs after starting/stopping the forward serial link, but the
+	 * deserializer synchronization time isn't clearly documented.
+	 *
+	 * According to the serializer datasheet we should wait 3ms, while
+	 * according to the deserializer datasheet we should wait 5ms.
+	 *
+	 * Short delays here appear to show bit-errors in the writes following.
+	 * Therefore a conservative delay seems best here.
+	 */
+	max9271_write(dev, 0x04, val);
+	usleep_range(5000, 8000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_set_serial_link);
+
+int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config)
+{
+	int ret;
+
+	ret = max9271_write(dev, 0x0d, i2c_config);
+	if (ret)
+		return ret;
+
+	/* The delay required after an I2C bus configuration change is not
+	 * characterized in the serializer manual. Sleep up to 5msec to
+	 * stay safe.
+	 */
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_configure_i2c);
+
+int max9271_set_high_threshold(struct max9271_device *dev, bool enable)
+{
+	int ret = max9271_read(dev, 0x08);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Enable or disable reverse channel high threshold to increase
+	 * immunity to power supply noise.
+	 */
+	max9271_write(dev, 0x08, enable ? ret | BIT(0) : ret & ~BIT(0));
+	usleep_range(2000, 2500);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_set_high_threshold);
+
+int max9271_configure_gmsl_link(struct max9271_device *dev)
+{
+	/*
+	 * Configure the GMSL link:
+	 *
+	 * - Double input mode, high data rate, 24-bit mode
+	 * - Latch input data on PCLKIN rising edge
+	 * - Enable HS/VS encoding
+	 * - 1-bit parity error detection
+	 *
+	 * TODO: Make the GMSL link configuration parametric.
+	 */
+	max9271_write(dev, 0x07, MAX9271_DBL | MAX9271_HVEN |
+		      MAX9271_EDC_1BIT_PARITY);
+	usleep_range(5000, 8000);
+
+	/*
+	 * Adjust spread spectrum to +4% and auto-detect pixel clock
+	 * and serial link rate.
+	 */
+	max9271_write(dev, 0x02, MAX9271_SPREAD_SPECT_4 | MAX9271_R02_RES |
+		      MAX9271_PCLK_AUTODETECT | MAX9271_SERIAL_AUTODETECT);
+	usleep_range(5000, 8000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_configure_gmsl_link);
+
+int max9271_set_gpios(struct max9271_device *dev, u8 gpio_mask)
+{
+	int ret = max9271_read(dev, 0x0f);
+	if (ret < 0)
+		return 0;
+
+	ret |= gpio_mask;
+	ret = max9271_write(dev, 0x0f, ret);
+	if (ret < 0) {
+		dev_err(&dev->client->dev, "Failed to set gpio (%d)\n", ret);
+		return ret;
+	}
+
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_set_gpios);
+
+int max9271_clear_gpios(struct max9271_device *dev, u8 gpio_mask)
+{
+	int ret = max9271_read(dev, 0x0f);
+	if (ret < 0)
+		return 0;
+
+	ret &= ~gpio_mask;
+	ret = max9271_write(dev, 0x0f, ret);
+	if (ret < 0) {
+		dev_err(&dev->client->dev, "Failed to clear gpio (%d)\n", ret);
+		return ret;
+	}
+
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_clear_gpios);
+
+int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask)
+{
+	int ret = max9271_read(dev, 0x0f);
+	if (ret < 0)
+		return 0;
+
+	/* BIT(0) reserved: GPO is always enabled. */
+	ret |= gpio_mask | BIT(0);
+	ret = max9271_write(dev, 0x0e, ret);
+	if (ret < 0) {
+		dev_err(&dev->client->dev, "Failed to enable gpio (%d)\n", ret);
+		return ret;
+	}
+
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_enable_gpios);
+
+int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask)
+{
+	int ret = max9271_read(dev, 0x0f);
+	if (ret < 0)
+		return 0;
+
+	/* BIT(0) reserved: GPO cannot be disabled */
+	ret &= (~gpio_mask | BIT(0));
+	ret = max9271_write(dev, 0x0e, ret);
+	if (ret < 0) {
+		dev_err(&dev->client->dev, "Failed to disable gpio (%d)\n", ret);
+		return ret;
+	}
+
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_disable_gpios);
+
+int max9271_verify_id(struct max9271_device *dev)
+{
+	int ret;
+
+	ret = max9271_read(dev, 0x1e);
+	if (ret < 0) {
+		dev_err(&dev->client->dev, "MAX9271 ID read failed (%d)\n",
+			ret);
+		return ret;
+	}
+
+	if (ret != MAX9271_ID) {
+		dev_err(&dev->client->dev, "MAX9271 ID mismatch (0x%02x)\n",
+			ret);
+		return -ENXIO;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_verify_id);
+
+int max9271_set_address(struct max9271_device *dev, u8 addr)
+{
+	int ret;
+
+	ret = max9271_write(dev, 0x00, addr << 1);
+	if (ret < 0) {
+		dev_err(&dev->client->dev,
+			"MAX9271 I2C address change failed (%d)\n", ret);
+		return ret;
+	}
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_set_address);
+
+int max9271_set_deserializer_address(struct max9271_device *dev, u8 addr)
+{
+	int ret;
+
+	ret = max9271_write(dev, 0x01, addr << 1);
+	if (ret < 0) {
+		dev_err(&dev->client->dev,
+			"MAX9271 deserializer address set failed (%d)\n", ret);
+		return ret;
+	}
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_set_deserializer_address);
+
+int max9271_set_translation(struct max9271_device *dev, u8 source, u8 dest)
+{
+	int ret;
+
+	ret = max9271_write(dev, 0x09, source << 1);
+	if (ret < 0) {
+		dev_err(&dev->client->dev,
+			"MAX9271 I2C translation setup failed (%d)\n", ret);
+		return ret;
+	}
+	usleep_range(3500, 5000);
+
+	ret = max9271_write(dev, 0x0a, dest << 1);
+	if (ret < 0) {
+		dev_err(&dev->client->dev,
+			"MAX9271 I2C translation setup failed (%d)\n", ret);
+		return ret;
+	}
+	usleep_range(3500, 5000);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max9271_set_translation);
diff --git a/drivers/media/i2c/max9271.h b/drivers/media/i2c/max9271.h
new file mode 100644
index 000000000000..d78fb21441e9
--- /dev/null
+++ b/drivers/media/i2c/max9271.h
@@ -0,0 +1,224 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2017-2020 Jacopo Mondi
+ * Copyright (C) 2017-2020 Kieran Bingham
+ * Copyright (C) 2017-2020 Laurent Pinchart
+ * Copyright (C) 2017-2020 Niklas Söderlund
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ * Copyright (C) 2015 Cogent Embedded, Inc.
+ */
+
+#include <linux/i2c.h>
+
+#define MAX9271_DEFAULT_ADDR	0x40
+
+/* Register 0x02 */
+#define MAX9271_SPREAD_SPECT_0		(0 << 5)
+#define MAX9271_SPREAD_SPECT_05		(1 << 5)
+#define MAX9271_SPREAD_SPECT_15		(2 << 5)
+#define MAX9271_SPREAD_SPECT_1		(5 << 5)
+#define MAX9271_SPREAD_SPECT_2		(3 << 5)
+#define MAX9271_SPREAD_SPECT_3		(6 << 5)
+#define MAX9271_SPREAD_SPECT_4		(7 << 5)
+#define MAX9271_R02_RES			BIT(4)
+#define MAX9271_PCLK_AUTODETECT		(3 << 2)
+#define MAX9271_SERIAL_AUTODETECT	(0x03)
+/* Register 0x04 */
+#define MAX9271_SEREN			BIT(7)
+#define MAX9271_CLINKEN			BIT(6)
+#define MAX9271_PRBSEN			BIT(5)
+#define MAX9271_SLEEP			BIT(4)
+#define MAX9271_INTTYPE_I2C		(0 << 2)
+#define MAX9271_INTTYPE_UART		(1 << 2)
+#define MAX9271_INTTYPE_NONE		(2 << 2)
+#define MAX9271_REVCCEN			BIT(1)
+#define MAX9271_FWDCCEN			BIT(0)
+/* Register 0x07 */
+#define MAX9271_DBL			BIT(7)
+#define MAX9271_DRS			BIT(6)
+#define MAX9271_BWS			BIT(5)
+#define MAX9271_ES			BIT(4)
+#define MAX9271_HVEN			BIT(2)
+#define MAX9271_EDC_1BIT_PARITY		(0 << 0)
+#define MAX9271_EDC_6BIT_CRC		(1 << 0)
+#define MAX9271_EDC_6BIT_HAMMING	(2 << 0)
+/* Register 0x08 */
+#define MAX9271_INVVS			BIT(7)
+#define MAX9271_INVHS			BIT(6)
+#define MAX9271_REV_LOGAIN		BIT(3)
+#define MAX9271_REV_HIVTH		BIT(0)
+/* Register 0x09 */
+#define MAX9271_ID			0x09
+/* Register 0x0d */
+#define MAX9271_I2CLOCACK		BIT(7)
+#define MAX9271_I2CSLVSH_1046NS_469NS	(3 << 5)
+#define MAX9271_I2CSLVSH_938NS_352NS	(2 << 5)
+#define MAX9271_I2CSLVSH_469NS_234NS	(1 << 5)
+#define MAX9271_I2CSLVSH_352NS_117NS	(0 << 5)
+#define MAX9271_I2CMSTBT_837KBPS	(7 << 2)
+#define MAX9271_I2CMSTBT_533KBPS	(6 << 2)
+#define MAX9271_I2CMSTBT_339KBPS	(5 << 2)
+#define MAX9271_I2CMSTBT_173KBPS	(4 << 2)
+#define MAX9271_I2CMSTBT_105KBPS	(3 << 2)
+#define MAX9271_I2CMSTBT_84KBPS		(2 << 2)
+#define MAX9271_I2CMSTBT_28KBPS		(1 << 2)
+#define MAX9271_I2CMSTBT_8KBPS		(0 << 2)
+#define MAX9271_I2CSLVTO_NONE		(3 << 0)
+#define MAX9271_I2CSLVTO_1024US		(2 << 0)
+#define MAX9271_I2CSLVTO_256US		(1 << 0)
+#define MAX9271_I2CSLVTO_64US		(0 << 0)
+/* Register 0x0f */
+#define MAX9271_GPIO5OUT		BIT(5)
+#define MAX9271_GPIO4OUT		BIT(4)
+#define MAX9271_GPIO3OUT		BIT(3)
+#define MAX9271_GPIO2OUT		BIT(2)
+#define MAX9271_GPIO1OUT		BIT(1)
+#define MAX9271_GPO			BIT(0)
+/* Register 0x15 */
+#define MAX9271_PCLKDET			BIT(0)
+
+/**
+ * struct max9271_device - max9271 device
+ * @client: The i2c client for the max9271 instance
+ */
+struct max9271_device {
+	struct i2c_client *client;
+};
+
+/**
+ * max9271_set_serial_link() - Enable/disable serial link
+ * @dev: The max9271 device
+ * @enable: Serial link enable/disable flag
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_set_serial_link(struct max9271_device *dev, bool enable);
+
+/**
+ * max9271_configure_i2c() - Configure I2C bus parameters
+ * @dev: The max9271 device
+ * @i2c_config: The I2C bus configuration bit mask
+ *
+ * Configure MAX9271 I2C interface. The bus configuration provided in the
+ * @i2c_config parameter shall be assembled using bit values defined by the
+ * MAX9271_I2C* macros.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config);
+
+/**
+ * max9271_set_high_threshold() - Enable or disable reverse channel high
+ *				  threshold
+ * @dev: The max9271 device
+ * @enable: High threshold enable/disable flag
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_set_high_threshold(struct max9271_device *dev, bool enable);
+
+/**
+ * max9271_configure_gmsl_link() - Configure the GMSL link
+ * @dev: The max9271 device
+ *
+ * FIXME: the GMSL link configuration is currently hardcoded and performed
+ * by programming registers 0x04, 0x07 and 0x02.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_configure_gmsl_link(struct max9271_device *dev);
+
+/**
+ * max9271_set_gpios() - Set gpio lines to physical high value
+ * @dev: The max9271 device
+ * @gpio_mask: The mask of gpio lines to set to high value
+ *
+ * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]*
+ * bit values.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_set_gpios(struct max9271_device *dev, u8 gpio_mask);
+
+/**
+ * max9271_clear_gpios() - Set gpio lines to physical low value
+ * @dev: The max9271 device
+ * @gpio_mask: The mask of gpio lines to set to low value
+ *
+ * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]*
+ * bit values.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_clear_gpios(struct max9271_device *dev, u8 gpio_mask);
+
+/**
+ * max9271_enable_gpios() - Enable gpio lines
+ * @dev: The max9271 device
+ * @gpio_mask: The mask of gpio lines to enable
+ *
+ * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO*
+ * bit values. GPO line is always enabled by default.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask);
+
+/**
+ * max9271_disable_gpios() - Disable gpio lines
+ * @dev: The max9271 device
+ * @gpio_mask: The mask of gpio lines to disable
+ *
+ * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO*
+ * bit values. GPO line is always enabled by default and cannot be disabled.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask);
+
+/**
+ * max9271_verify_id() - Read and verify MAX9271 id
+ * @dev: The max9271 device
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_verify_id(struct max9271_device *dev);
+
+/**
+ * max9271_set_address() - Program a new I2C address
+ * @dev: The max9271 device
+ * @addr: The new I2C address in 7-bit format
+ *
+ * This function only takes care of programming the new I2C address @addr to
+ * in the MAX9271 chip registers, it is responsiblity of the caller to set
+ * the i2c address client to the @addr value to be able to communicate with
+ * the MAX9271 chip using the I2C framework APIs after this function returns.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_set_address(struct max9271_device *dev, u8 addr);
+
+/**
+ * max9271_set_deserializer_address() - Program the remote deserializer address
+ * @dev: The max9271 device
+ * @addr: The deserializer I2C address in 7-bit format
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_set_deserializer_address(struct max9271_device *dev, u8 addr);
+
+/**
+ * max9271_set_translation() - Program I2C address translation
+ * @dev: The max9271 device
+ * @source: The I2C source address
+ * @dest: The I2C destination address
+ *
+ * Program address translation from @source to @dest. This is required to
+ * communicate with local devices that do not support address reprogramming.
+ *
+ * TODO: The device supports translation of two address, this function currently
+ * supports a single one.
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+int max9271_set_translation(struct max9271_device *dev, u8 source, u8 dest);
diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
new file mode 100644
index 000000000000..37786998878b
--- /dev/null
+++ b/drivers/media/i2c/rdacm20.c
@@ -0,0 +1,668 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * IMI RDACM20 GMSL Camera Driver
+ *
+ * Copyright (C) 2017-2020 Jacopo Mondi
+ * Copyright (C) 2017-2020 Kieran Bingham
+ * Copyright (C) 2017-2019 Laurent Pinchart
+ * Copyright (C) 2017-2019 Niklas Söderlund
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ * Copyright (C) 2015 Cogent Embedded, Inc.
+ */
+
+/*
+ * The camera is made of an Omnivision OV10635 sensor connected to a Maxim
+ * MAX9271 GMSL serializer.
+ */
+
+#include <linux/delay.h>
+#include <linux/fwnode.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-subdev.h>
+
+#include "max9271.h"
+
+#define OV10635_I2C_ADDRESS		0x30
+
+#define OV10635_SOFTWARE_RESET		0x0103
+#define OV10635_PID			0x300a
+#define OV10635_VER			0x300b
+#define OV10635_SC_CMMN_SCCB_ID		0x300c
+#define OV10635_SC_CMMN_SCCB_ID_SELECT	BIT(0)
+#define OV10635_VERSION			0xa635
+
+#define OV10635_WIDTH			1280
+#define OV10635_HEIGHT			800
+#define OV10635_FORMAT			MEDIA_BUS_FMT_UYVY8_2X8
+
+/* VTS = PCLK / FPS / HTS / 2 (= 88MHz / 1572 / 30 / 2) */
+#define OV10635_HTS			1572
+/* FPS = 29,9998 */
+#define OV10635_VTS			933
+
+/*
+ * As the drivers supports a single MEDIA_BUS_FMT_UYVY8_2X8 format we
+ * can harcode the pixel rate.
+ *
+ * PCLK is fed through the system clock, programmed @88MHz.
+ * MEDIA_BUS_FMT_UYVY8_2X8 format = 2 samples per pixel.
+ *
+ * Pixelrate = PCLK / 2
+ * FPS = (OV10635_VTS * OV10635_HTS) / PixelRate
+ *     = 29,9998
+ */
+#define OV10635_PIXEL_RATE		(44000000)
+
+static const struct ov10635_reg {
+	u16	reg;
+	u8	val;
+} ov10635_regs_wizard[] = {
+	{ 0x301b, 0xff }, { 0x301c, 0xff }, { 0x301a, 0xff }, { 0x3011, 0x42 },
+	{ 0x6900, 0x0c }, { 0x6901, 0x19 }, { 0x3503, 0x10 }, { 0x3025, 0x03 },
+	{ 0x3003, 0x16 }, { 0x3004, 0x30 }, { 0x3005, 0x40 }, { 0x3006, 0x91 },
+	{ 0x3600, 0x74 }, { 0x3601, 0x2b }, { 0x3612, 0x00 }, { 0x3611, 0x67 },
+	{ 0x3633, 0xca }, { 0x3602, 0xaf }, { 0x3603, 0x04 }, { 0x3630, 0x28 },
+	{ 0x3631, 0x16 }, { 0x3714, 0x10 }, { 0x371d, 0x01 }, { 0x4300, 0x3a },
+	{ 0x3007, 0x01 }, { 0x3024, 0x03 }, { 0x3020, 0x0a }, { 0x3702, 0x0d },
+	{ 0x3703, 0x20 }, { 0x3704, 0x15 }, { 0x3709, 0xa8 }, { 0x370c, 0xc7 },
+	{ 0x370d, 0x80 }, { 0x3712, 0x00 }, { 0x3713, 0x20 }, { 0x3715, 0x04 },
+	{ 0x381d, 0x40 }, { 0x381c, 0x00 }, { 0x3822, 0x50 }, { 0x3824, 0x10 },
+	{ 0x3815, 0x8c }, { 0x3804, 0x05 }, { 0x3805, 0x1f }, { 0x3800, 0x00 },
+	{ 0x3801, 0x00 }, { 0x3806, 0x03 }, { 0x3807, 0x28 }, { 0x3802, 0x00 },
+	{ 0x3803, 0x07 }, { 0x3808, 0x05 }, { 0x3809, 0x00 }, { 0x380a, 0x03 },
+	{ 0x380b, 0x20 }, { 0x380c, OV10635_HTS >> 8 },
+	{ 0x380d, OV10635_HTS & 0xff }, { 0x380e, OV10635_VTS >> 8 },
+	{ 0x380f, OV10635_VTS & 0xff },	{ 0x3813, 0x02 }, { 0x3811, 0x08 },
+	{ 0x381f, 0x0c }, { 0x3819, 0x04 }, { 0x3804, 0x01 }, { 0x3805, 0x00 },
+	{ 0x3828, 0x03 }, { 0x3829, 0x10 }, { 0x382a, 0x10 }, { 0x3621, 0x63 },
+	{ 0x5005, 0x08 }, { 0x56d5, 0x00 }, { 0x56d6, 0x80 }, { 0x56d7, 0x00 },
+	{ 0x56d8, 0x00 }, { 0x56d9, 0x00 }, { 0x56da, 0x80 }, { 0x56db, 0x00 },
+	{ 0x56dc, 0x00 }, { 0x56e8, 0x00 }, { 0x56e9, 0x7f }, { 0x56ea, 0x00 },
+	{ 0x56eb, 0x7f }, { 0x5100, 0x00 }, { 0x5101, 0x80 }, { 0x5102, 0x00 },
+	{ 0x5103, 0x80 }, { 0x5104, 0x00 }, { 0x5105, 0x80 }, { 0x5106, 0x00 },
+	{ 0x5107, 0x80 }, { 0x5108, 0x00 }, { 0x5109, 0x00 }, { 0x510a, 0x00 },
+	{ 0x510b, 0x00 }, { 0x510c, 0x00 }, { 0x510d, 0x00 }, { 0x510e, 0x00 },
+	{ 0x510f, 0x00 }, { 0x5110, 0x00 }, { 0x5111, 0x80 }, { 0x5112, 0x00 },
+	{ 0x5113, 0x80 }, { 0x5114, 0x00 }, { 0x5115, 0x80 }, { 0x5116, 0x00 },
+	{ 0x5117, 0x80 }, { 0x5118, 0x00 }, { 0x5119, 0x00 }, { 0x511a, 0x00 },
+	{ 0x511b, 0x00 }, { 0x511c, 0x00 }, { 0x511d, 0x00 }, { 0x511e, 0x00 },
+	{ 0x511f, 0x00 }, { 0x56d0, 0x00 }, { 0x5006, 0x04 }, { 0x5608, 0x05 },
+	{ 0x52d7, 0x06 }, { 0x528d, 0x08 }, { 0x5293, 0x12 }, { 0x52d3, 0x12 },
+	{ 0x5288, 0x06 }, { 0x5289, 0x20 }, { 0x52c8, 0x06 }, { 0x52c9, 0x20 },
+	{ 0x52cd, 0x04 }, { 0x5381, 0x00 }, { 0x5382, 0xff }, { 0x5589, 0x76 },
+	{ 0x558a, 0x47 }, { 0x558b, 0xef }, { 0x558c, 0xc9 }, { 0x558d, 0x49 },
+	{ 0x558e, 0x30 }, { 0x558f, 0x67 }, { 0x5590, 0x3f }, { 0x5591, 0xf0 },
+	{ 0x5592, 0x10 }, { 0x55a2, 0x6d }, { 0x55a3, 0x55 }, { 0x55a4, 0xc3 },
+	{ 0x55a5, 0xb5 }, { 0x55a6, 0x43 }, { 0x55a7, 0x38 }, { 0x55a8, 0x5f },
+	{ 0x55a9, 0x4b }, { 0x55aa, 0xf0 }, { 0x55ab, 0x10 }, { 0x5581, 0x52 },
+	{ 0x5300, 0x01 }, { 0x5301, 0x00 }, { 0x5302, 0x00 }, { 0x5303, 0x0e },
+	{ 0x5304, 0x00 }, { 0x5305, 0x0e }, { 0x5306, 0x00 }, { 0x5307, 0x36 },
+	{ 0x5308, 0x00 }, { 0x5309, 0xd9 }, { 0x530a, 0x00 }, { 0x530b, 0x0f },
+	{ 0x530c, 0x00 }, { 0x530d, 0x2c }, { 0x530e, 0x00 }, { 0x530f, 0x59 },
+	{ 0x5310, 0x00 }, { 0x5311, 0x7b }, { 0x5312, 0x00 }, { 0x5313, 0x22 },
+	{ 0x5314, 0x00 }, { 0x5315, 0xd5 }, { 0x5316, 0x00 }, { 0x5317, 0x13 },
+	{ 0x5318, 0x00 }, { 0x5319, 0x18 }, { 0x531a, 0x00 }, { 0x531b, 0x26 },
+	{ 0x531c, 0x00 }, { 0x531d, 0xdc }, { 0x531e, 0x00 }, { 0x531f, 0x02 },
+	{ 0x5320, 0x00 }, { 0x5321, 0x24 }, { 0x5322, 0x00 }, { 0x5323, 0x56 },
+	{ 0x5324, 0x00 }, { 0x5325, 0x85 }, { 0x5326, 0x00 }, { 0x5327, 0x20 },
+	{ 0x5609, 0x01 }, { 0x560a, 0x40 }, { 0x560b, 0x01 }, { 0x560c, 0x40 },
+	{ 0x560d, 0x00 }, { 0x560e, 0xfa }, { 0x560f, 0x00 }, { 0x5610, 0xfa },
+	{ 0x5611, 0x02 }, { 0x5612, 0x80 }, { 0x5613, 0x02 }, { 0x5614, 0x80 },
+	{ 0x5615, 0x01 }, { 0x5616, 0x2c }, { 0x5617, 0x01 }, { 0x5618, 0x2c },
+	{ 0x563b, 0x01 }, { 0x563c, 0x01 }, { 0x563d, 0x01 }, { 0x563e, 0x01 },
+	{ 0x563f, 0x03 }, { 0x5640, 0x03 }, { 0x5641, 0x03 }, { 0x5642, 0x05 },
+	{ 0x5643, 0x09 }, { 0x5644, 0x05 }, { 0x5645, 0x05 }, { 0x5646, 0x05 },
+	{ 0x5647, 0x05 }, { 0x5651, 0x00 }, { 0x5652, 0x80 }, { 0x521a, 0x01 },
+	{ 0x521b, 0x03 }, { 0x521c, 0x06 }, { 0x521d, 0x0a }, { 0x521e, 0x0e },
+	{ 0x521f, 0x12 }, { 0x5220, 0x16 }, { 0x5223, 0x02 }, { 0x5225, 0x04 },
+	{ 0x5227, 0x08 }, { 0x5229, 0x0c }, { 0x522b, 0x12 }, { 0x522d, 0x18 },
+	{ 0x522f, 0x1e }, { 0x5241, 0x04 }, { 0x5242, 0x01 }, { 0x5243, 0x03 },
+	{ 0x5244, 0x06 }, { 0x5245, 0x0a }, { 0x5246, 0x0e }, { 0x5247, 0x12 },
+	{ 0x5248, 0x16 }, { 0x524a, 0x03 }, { 0x524c, 0x04 }, { 0x524e, 0x08 },
+	{ 0x5250, 0x0c }, { 0x5252, 0x12 }, { 0x5254, 0x18 }, { 0x5256, 0x1e },
+	/* fifo_line_length = 2*hts */
+	{ 0x4606, (2 * OV10635_HTS) >> 8 }, { 0x4607, (2 * OV10635_HTS) & 0xff },
+	/* fifo_hsync_start = 2*(hts - xres) */
+	{ 0x460a, (2 * (OV10635_HTS - OV10635_WIDTH)) >> 8 },
+	{ 0x460b, (2 * (OV10635_HTS - OV10635_WIDTH)) & 0xff },
+	{ 0x460c, 0x00 }, { 0x4620, 0x0e },
+	/* BT601: 0x08 is also acceptable as HS/VS mode */
+	{ 0x4700, 0x04 }, { 0x4701, 0x00 }, { 0x4702, 0x01 }, { 0x4004, 0x04 },
+	{ 0x4005, 0x18 }, { 0x4001, 0x06 }, { 0x4050, 0x22 }, { 0x4051, 0x24 },
+	{ 0x4052, 0x02 }, { 0x4057, 0x9c }, { 0x405a, 0x00 }, { 0x4202, 0x02 },
+	{ 0x3023, 0x10 }, { 0x0100, 0x01 }, { 0x0100, 0x01 }, { 0x6f10, 0x07 },
+	{ 0x6f11, 0x82 }, { 0x6f12, 0x04 }, { 0x6f13, 0x00 }, { 0xd000, 0x19 },
+	{ 0xd001, 0xa0 }, { 0xd002, 0x00 }, { 0xd003, 0x01 }, { 0xd004, 0xa9 },
+	{ 0xd005, 0xad }, { 0xd006, 0x10 }, { 0xd007, 0x40 }, { 0xd008, 0x44 },
+	{ 0xd009, 0x00 }, { 0xd00a, 0x68 }, { 0xd00b, 0x00 }, { 0xd00c, 0x15 },
+	{ 0xd00d, 0x00 }, { 0xd00e, 0x00 }, { 0xd00f, 0x00 }, { 0xd040, 0x9c },
+	{ 0xd041, 0x21 }, { 0xd042, 0xff }, { 0xd043, 0xf8 }, { 0xd044, 0xd4 },
+	{ 0xd045, 0x01 }, { 0xd046, 0x48 }, { 0xd047, 0x00 }, { 0xd048, 0xd4 },
+	{ 0xd049, 0x01 }, { 0xd04a, 0x50 }, { 0xd04b, 0x04 }, { 0xd04c, 0x18 },
+	{ 0xd04d, 0x60 }, { 0xd04e, 0x00 }, { 0xd04f, 0x01 }, { 0xd050, 0xa8 },
+	{ 0xd051, 0x63 }, { 0xd052, 0x02 }, { 0xd053, 0xa4 }, { 0xd054, 0x85 },
+	{ 0xd055, 0x43 }, { 0xd056, 0x00 }, { 0xd057, 0x00 }, { 0xd058, 0x18 },
+	{ 0xd059, 0x60 }, { 0xd05a, 0x00 }, { 0xd05b, 0x01 }, { 0xd05c, 0xa8 },
+	{ 0xd05d, 0x63 }, { 0xd05e, 0x03 }, { 0xd05f, 0xf0 }, { 0xd060, 0x98 },
+	{ 0xd061, 0xa3 }, { 0xd062, 0x00 }, { 0xd063, 0x00 }, { 0xd064, 0x8c },
+	{ 0xd065, 0x6a }, { 0xd066, 0x00 }, { 0xd067, 0x6e }, { 0xd068, 0xe5 },
+	{ 0xd069, 0x85 }, { 0xd06a, 0x18 }, { 0xd06b, 0x00 }, { 0xd06c, 0x10 },
+	{ 0xd06d, 0x00 }, { 0xd06e, 0x00 }, { 0xd06f, 0x10 }, { 0xd070, 0x9c },
+	{ 0xd071, 0x80 }, { 0xd072, 0x00 }, { 0xd073, 0x03 }, { 0xd074, 0x18 },
+	{ 0xd075, 0x60 }, { 0xd076, 0x00 }, { 0xd077, 0x01 }, { 0xd078, 0xa8 },
+	{ 0xd079, 0x63 }, { 0xd07a, 0x07 }, { 0xd07b, 0x80 }, { 0xd07c, 0x07 },
+	{ 0xd07d, 0xff }, { 0xd07e, 0xf9 }, { 0xd07f, 0x03 }, { 0xd080, 0x8c },
+	{ 0xd081, 0x63 }, { 0xd082, 0x00 }, { 0xd083, 0x00 }, { 0xd084, 0xa5 },
+	{ 0xd085, 0x6b }, { 0xd086, 0x00 }, { 0xd087, 0xff }, { 0xd088, 0x18 },
+	{ 0xd089, 0x80 }, { 0xd08a, 0x00 }, { 0xd08b, 0x01 }, { 0xd08c, 0xa8 },
+	{ 0xd08d, 0x84 }, { 0xd08e, 0x01 }, { 0xd08f, 0x04 }, { 0xd090, 0xe1 },
+	{ 0xd091, 0x6b }, { 0xd092, 0x58 }, { 0xd093, 0x00 }, { 0xd094, 0x94 },
+	{ 0xd095, 0x6a }, { 0xd096, 0x00 }, { 0xd097, 0x70 }, { 0xd098, 0xe1 },
+	{ 0xd099, 0x6b }, { 0xd09a, 0x20 }, { 0xd09b, 0x00 }, { 0xd09c, 0x95 },
+	{ 0xd09d, 0x6b }, { 0xd09e, 0x00 }, { 0xd09f, 0x00 }, { 0xd0a0, 0xe4 },
+	{ 0xd0a1, 0x8b }, { 0xd0a2, 0x18 }, { 0xd0a3, 0x00 }, { 0xd0a4, 0x0c },
+	{ 0xd0a5, 0x00 }, { 0xd0a6, 0x00 }, { 0xd0a7, 0x23 }, { 0xd0a8, 0x15 },
+	{ 0xd0a9, 0x00 }, { 0xd0aa, 0x00 }, { 0xd0ab, 0x00 }, { 0xd0ac, 0x18 },
+	{ 0xd0ad, 0x60 }, { 0xd0ae, 0x80 }, { 0xd0af, 0x06 }, { 0xd0b0, 0xa8 },
+	{ 0xd0b1, 0x83 }, { 0xd0b2, 0x40 }, { 0xd0b3, 0x08 }, { 0xd0b4, 0xa8 },
+	{ 0xd0b5, 0xe3 }, { 0xd0b6, 0x38 }, { 0xd0b7, 0x2a }, { 0xd0b8, 0xa8 },
+	{ 0xd0b9, 0xc3 }, { 0xd0ba, 0x40 }, { 0xd0bb, 0x09 }, { 0xd0bc, 0xa8 },
+	{ 0xd0bd, 0xa3 }, { 0xd0be, 0x38 }, { 0xd0bf, 0x29 }, { 0xd0c0, 0x8c },
+	{ 0xd0c1, 0x65 }, { 0xd0c2, 0x00 }, { 0xd0c3, 0x00 }, { 0xd0c4, 0xd8 },
+	{ 0xd0c5, 0x04 }, { 0xd0c6, 0x18 }, { 0xd0c7, 0x00 }, { 0xd0c8, 0x8c },
+	{ 0xd0c9, 0x67 }, { 0xd0ca, 0x00 }, { 0xd0cb, 0x00 }, { 0xd0cc, 0xd8 },
+	{ 0xd0cd, 0x06 }, { 0xd0ce, 0x18 }, { 0xd0cf, 0x00 }, { 0xd0d0, 0x18 },
+	{ 0xd0d1, 0x60 }, { 0xd0d2, 0x80 }, { 0xd0d3, 0x06 }, { 0xd0d4, 0xa8 },
+	{ 0xd0d5, 0xe3 }, { 0xd0d6, 0x67 }, { 0xd0d7, 0x02 }, { 0xd0d8, 0xa9 },
+	{ 0xd0d9, 0x03 }, { 0xd0da, 0x67 }, { 0xd0db, 0x03 }, { 0xd0dc, 0xa8 },
+	{ 0xd0dd, 0xc3 }, { 0xd0de, 0x3d }, { 0xd0df, 0x05 }, { 0xd0e0, 0x8c },
+	{ 0xd0e1, 0x66 }, { 0xd0e2, 0x00 }, { 0xd0e3, 0x00 }, { 0xd0e4, 0xb8 },
+	{ 0xd0e5, 0x63 }, { 0xd0e6, 0x00 }, { 0xd0e7, 0x18 }, { 0xd0e8, 0xb8 },
+	{ 0xd0e9, 0x63 }, { 0xd0ea, 0x00 }, { 0xd0eb, 0x98 }, { 0xd0ec, 0xbc },
+	{ 0xd0ed, 0x03 }, { 0xd0ee, 0x00 }, { 0xd0ef, 0x00 }, { 0xd0f0, 0x10 },
+	{ 0xd0f1, 0x00 }, { 0xd0f2, 0x00 }, { 0xd0f3, 0x16 }, { 0xd0f4, 0xb8 },
+	{ 0xd0f5, 0x83 }, { 0xd0f6, 0x00 }, { 0xd0f7, 0x19 }, { 0xd0f8, 0x8c },
+	{ 0xd0f9, 0x67 }, { 0xd0fa, 0x00 }, { 0xd0fb, 0x00 }, { 0xd0fc, 0xb8 },
+	{ 0xd0fd, 0xa4 }, { 0xd0fe, 0x00 }, { 0xd0ff, 0x98 }, { 0xd100, 0xb8 },
+	{ 0xd101, 0x83 }, { 0xd102, 0x00 }, { 0xd103, 0x08 }, { 0xd104, 0x8c },
+	{ 0xd105, 0x68 }, { 0xd106, 0x00 }, { 0xd107, 0x00 }, { 0xd108, 0xe0 },
+	{ 0xd109, 0x63 }, { 0xd10a, 0x20 }, { 0xd10b, 0x04 }, { 0xd10c, 0xe0 },
+	{ 0xd10d, 0x65 }, { 0xd10e, 0x18 }, { 0xd10f, 0x00 }, { 0xd110, 0xa4 },
+	{ 0xd111, 0x83 }, { 0xd112, 0xff }, { 0xd113, 0xff }, { 0xd114, 0xb8 },
+	{ 0xd115, 0x64 }, { 0xd116, 0x00 }, { 0xd117, 0x48 }, { 0xd118, 0xd8 },
+	{ 0xd119, 0x07 }, { 0xd11a, 0x18 }, { 0xd11b, 0x00 }, { 0xd11c, 0xd8 },
+	{ 0xd11d, 0x08 }, { 0xd11e, 0x20 }, { 0xd11f, 0x00 }, { 0xd120, 0x9c },
+	{ 0xd121, 0x60 }, { 0xd122, 0x00 }, { 0xd123, 0x00 }, { 0xd124, 0xd8 },
+	{ 0xd125, 0x06 }, { 0xd126, 0x18 }, { 0xd127, 0x00 }, { 0xd128, 0x00 },
+	{ 0xd129, 0x00 }, { 0xd12a, 0x00 }, { 0xd12b, 0x08 }, { 0xd12c, 0x15 },
+	{ 0xd12d, 0x00 }, { 0xd12e, 0x00 }, { 0xd12f, 0x00 }, { 0xd130, 0x8c },
+	{ 0xd131, 0x6a }, { 0xd132, 0x00 }, { 0xd133, 0x76 }, { 0xd134, 0xbc },
+	{ 0xd135, 0x23 }, { 0xd136, 0x00 }, { 0xd137, 0x00 }, { 0xd138, 0x13 },
+	{ 0xd139, 0xff }, { 0xd13a, 0xff }, { 0xd13b, 0xe6 }, { 0xd13c, 0x18 },
+	{ 0xd13d, 0x60 }, { 0xd13e, 0x80 }, { 0xd13f, 0x06 }, { 0xd140, 0x03 },
+	{ 0xd141, 0xff }, { 0xd142, 0xff }, { 0xd143, 0xdd }, { 0xd144, 0xa8 },
+	{ 0xd145, 0x83 }, { 0xd146, 0x40 }, { 0xd147, 0x08 }, { 0xd148, 0x85 },
+	{ 0xd149, 0x21 }, { 0xd14a, 0x00 }, { 0xd14b, 0x00 }, { 0xd14c, 0x85 },
+	{ 0xd14d, 0x41 }, { 0xd14e, 0x00 }, { 0xd14f, 0x04 }, { 0xd150, 0x44 },
+	{ 0xd151, 0x00 }, { 0xd152, 0x48 }, { 0xd153, 0x00 }, { 0xd154, 0x9c },
+	{ 0xd155, 0x21 }, { 0xd156, 0x00 }, { 0xd157, 0x08 }, { 0x6f0e, 0x03 },
+	{ 0x6f0f, 0x00 }, { 0x460e, 0x08 }, { 0x460f, 0x01 }, { 0x4610, 0x00 },
+	{ 0x4611, 0x01 }, { 0x4612, 0x00 }, { 0x4613, 0x01 },
+	/* 8 bits */
+	{ 0x4605, 0x08 },
+	/* Swap data bits order [9:0] -> [0:9] */
+	{ 0x4709, 0x10 }, { 0x4608, 0x00 }, { 0x4609, 0x08 }, { 0x6804, 0x00 },
+	{ 0x6805, 0x06 }, { 0x6806, 0x00 }, { 0x5120, 0x00 }, { 0x3510, 0x00 },
+	{ 0x3504, 0x00 }, { 0x6800, 0x00 }, { 0x6f0d, 0x01 },
+	/* PCLK falling edge */
+	{ 0x4708, 0x01 }, { 0x5000, 0xff }, { 0x5001, 0xbf }, { 0x5002, 0x7e },
+	{ 0x503d, 0x00 }, { 0xc450, 0x01 }, { 0xc452, 0x04 }, { 0xc453, 0x00 },
+	{ 0xc454, 0x00 }, { 0xc455, 0x01 }, { 0xc456, 0x01 }, { 0xc457, 0x00 },
+	{ 0xc458, 0x00 }, { 0xc459, 0x00 }, { 0xc45b, 0x00 }, { 0xc45c, 0x01 },
+	{ 0xc45d, 0x00 }, { 0xc45e, 0x00 }, { 0xc45f, 0x00 }, { 0xc460, 0x00 },
+	{ 0xc461, 0x01 }, { 0xc462, 0x01 }, { 0xc464, 0x03 }, { 0xc465, 0x00 },
+	{ 0xc466, 0x8a }, { 0xc467, 0x00 }, { 0xc468, 0x86 }, { 0xc469, 0x00 },
+	{ 0xc46a, 0x40 }, { 0xc46b, 0x50 }, { 0xc46c, 0x30 }, { 0xc46d, 0x28 },
+	{ 0xc46e, 0x60 }, { 0xc46f, 0x40 }, { 0xc47c, 0x01 }, { 0xc47d, 0x38 },
+	{ 0xc47e, 0x00 }, { 0xc47f, 0x00 }, { 0xc480, 0x00 }, { 0xc481, 0xff },
+	{ 0xc482, 0x00 }, { 0xc483, 0x40 }, { 0xc484, 0x00 }, { 0xc485, 0x18 },
+	{ 0xc486, 0x00 }, { 0xc487, 0x18 },
+	{ 0xc488, (OV10635_VTS - 8) * 16 >> 8},
+	{ 0xc489, (OV10635_VTS - 8) * 16 & 0xff},
+	{ 0xc48a, (OV10635_VTS - 8) * 16 >> 8},
+	{ 0xc48b, (OV10635_VTS - 8) * 16 & 0xff}, { 0xc48c, 0x00 },
+	{ 0xc48d, 0x04 }, { 0xc48e, 0x00 }, { 0xc48f, 0x04 }, { 0xc490, 0x03 },
+	{ 0xc492, 0x20 }, { 0xc493, 0x08 }, { 0xc498, 0x02 }, { 0xc499, 0x00 },
+	{ 0xc49a, 0x02 }, { 0xc49b, 0x00 }, { 0xc49c, 0x02 }, { 0xc49d, 0x00 },
+	{ 0xc49e, 0x02 }, { 0xc49f, 0x60 }, { 0xc4a0, 0x03 }, { 0xc4a1, 0x00 },
+	{ 0xc4a2, 0x04 }, { 0xc4a3, 0x00 }, { 0xc4a4, 0x00 }, { 0xc4a5, 0x10 },
+	{ 0xc4a6, 0x00 }, { 0xc4a7, 0x40 }, { 0xc4a8, 0x00 }, { 0xc4a9, 0x80 },
+	{ 0xc4aa, 0x0d }, { 0xc4ab, 0x00 }, { 0xc4ac, 0x0f }, { 0xc4ad, 0xc0 },
+	{ 0xc4b4, 0x01 }, { 0xc4b5, 0x01 }, { 0xc4b6, 0x00 }, { 0xc4b7, 0x01 },
+	{ 0xc4b8, 0x00 }, { 0xc4b9, 0x01 }, { 0xc4ba, 0x01 }, { 0xc4bb, 0x00 },
+	{ 0xc4bc, 0x01 }, { 0xc4bd, 0x60 }, { 0xc4be, 0x02 }, { 0xc4bf, 0x33 },
+	{ 0xc4c8, 0x03 }, { 0xc4c9, 0xd0 }, { 0xc4ca, 0x0e }, { 0xc4cb, 0x00 },
+	{ 0xc4cc, 0x0e }, { 0xc4cd, 0x51 }, { 0xc4ce, 0x0e }, { 0xc4cf, 0x51 },
+	{ 0xc4d0, 0x04 }, { 0xc4d1, 0x80 }, { 0xc4e0, 0x04 }, { 0xc4e1, 0x02 },
+	{ 0xc4e2, 0x01 }, { 0xc4e4, 0x10 }, { 0xc4e5, 0x20 }, { 0xc4e6, 0x30 },
+	{ 0xc4e7, 0x40 }, { 0xc4e8, 0x50 }, { 0xc4e9, 0x60 }, { 0xc4ea, 0x70 },
+	{ 0xc4eb, 0x80 }, { 0xc4ec, 0x90 }, { 0xc4ed, 0xa0 }, { 0xc4ee, 0xb0 },
+	{ 0xc4ef, 0xc0 }, { 0xc4f0, 0xd0 }, { 0xc4f1, 0xe0 }, { 0xc4f2, 0xf0 },
+	{ 0xc4f3, 0x80 }, { 0xc4f4, 0x00 }, { 0xc4f5, 0x20 }, { 0xc4f6, 0x02 },
+	{ 0xc4f7, 0x00 }, { 0xc4f8, 0x00 }, { 0xc4f9, 0x00 }, { 0xc4fa, 0x00 },
+	{ 0xc4fb, 0x01 }, { 0xc4fc, 0x01 }, { 0xc4fd, 0x00 }, { 0xc4fe, 0x04 },
+	{ 0xc4ff, 0x02 }, { 0xc500, 0x48 }, { 0xc501, 0x74 }, { 0xc502, 0x58 },
+	{ 0xc503, 0x80 }, { 0xc504, 0x05 }, { 0xc505, 0x80 }, { 0xc506, 0x03 },
+	{ 0xc507, 0x80 }, { 0xc508, 0x01 }, { 0xc509, 0xc0 }, { 0xc50a, 0x01 },
+	{ 0xc50b, 0xa0 }, { 0xc50c, 0x01 }, { 0xc50d, 0x2c }, { 0xc50e, 0x01 },
+	{ 0xc50f, 0x0a }, { 0xc510, 0x00 }, { 0xc511, 0x00 }, { 0xc512, 0xe5 },
+	{ 0xc513, 0x14 }, { 0xc514, 0x04 }, { 0xc515, 0x00 }, { 0xc518, OV10635_VTS >> 8},
+	{ 0xc519, OV10635_VTS & 0xff}, { 0xc51a, OV10635_HTS >> 8},
+	{ 0xc51b, OV10635_HTS & 0xff}, { 0xc2e0, 0x00 }, { 0xc2e1, 0x51 },
+	{ 0xc2e2, 0x00 }, { 0xc2e3, 0xd6 }, { 0xc2e4, 0x01 }, { 0xc2e5, 0x5e },
+	{ 0xc2e9, 0x01 }, { 0xc2ea, 0x7a }, { 0xc2eb, 0x90 }, { 0xc2ed, 0x00 },
+	{ 0xc2ee, 0x7a }, { 0xc2ef, 0x64 }, { 0xc308, 0x00 }, { 0xc309, 0x00 },
+	{ 0xc30a, 0x00 }, { 0xc30c, 0x00 }, { 0xc30d, 0x01 }, { 0xc30e, 0x00 },
+	{ 0xc30f, 0x00 }, { 0xc310, 0x01 }, { 0xc311, 0x60 }, { 0xc312, 0xff },
+	{ 0xc313, 0x08 }, { 0xc314, 0x01 }, { 0xc315, 0x00 }, { 0xc316, 0xff },
+	{ 0xc317, 0x0b }, { 0xc318, 0x00 }, { 0xc319, 0x0c }, { 0xc31a, 0x00 },
+	{ 0xc31b, 0xe0 }, { 0xc31c, 0x00 }, { 0xc31d, 0x14 }, { 0xc31e, 0x00 },
+	{ 0xc31f, 0xc5 }, { 0xc320, 0xff }, { 0xc321, 0x4b }, { 0xc322, 0xff },
+	{ 0xc323, 0xf0 }, { 0xc324, 0xff }, { 0xc325, 0xe8 }, { 0xc326, 0x00 },
+	{ 0xc327, 0x46 }, { 0xc328, 0xff }, { 0xc329, 0xd2 }, { 0xc32a, 0xff },
+	{ 0xc32b, 0xe4 }, { 0xc32c, 0xff }, { 0xc32d, 0xbb }, { 0xc32e, 0x00 },
+	{ 0xc32f, 0x61 }, { 0xc330, 0xff }, { 0xc331, 0xf9 }, { 0xc332, 0x00 },
+	{ 0xc333, 0xd9 }, { 0xc334, 0x00 }, { 0xc335, 0x2e }, { 0xc336, 0x00 },
+	{ 0xc337, 0xb1 }, { 0xc338, 0xff }, { 0xc339, 0x64 }, { 0xc33a, 0xff },
+	{ 0xc33b, 0xeb }, { 0xc33c, 0xff }, { 0xc33d, 0xe8 }, { 0xc33e, 0x00 },
+	{ 0xc33f, 0x48 }, { 0xc340, 0xff }, { 0xc341, 0xd0 }, { 0xc342, 0xff },
+	{ 0xc343, 0xed }, { 0xc344, 0xff }, { 0xc345, 0xad }, { 0xc346, 0x00 },
+	{ 0xc347, 0x66 }, { 0xc348, 0x01 }, { 0xc349, 0x00 }, { 0x6700, 0x04 },
+	{ 0x6701, 0x7b }, { 0x6702, 0xfd }, { 0x6703, 0xf9 }, { 0x6704, 0x3d },
+	{ 0x6705, 0x71 }, { 0x6706, 0x78 }, { 0x6708, 0x05 }, { 0x6f06, 0x6f },
+	{ 0x6f07, 0x00 }, { 0x6f0a, 0x6f }, { 0x6f0b, 0x00 }, { 0x6f00, 0x03 },
+	{ 0xc34c, 0x01 }, { 0xc34d, 0x00 }, { 0xc34e, 0x46 }, { 0xc34f, 0x55 },
+	{ 0xc350, 0x00 }, { 0xc351, 0x40 }, { 0xc352, 0x00 }, { 0xc353, 0xff },
+	{ 0xc354, 0x04 }, { 0xc355, 0x08 }, { 0xc356, 0x01 }, { 0xc357, 0xef },
+	{ 0xc358, 0x30 }, { 0xc359, 0x01 }, { 0xc35a, 0x64 }, { 0xc35b, 0x46 },
+	{ 0xc35c, 0x00 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
+	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
+	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
+	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
+	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
+	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
+	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0xc261, 0x01 },
+	{ 0x301b, 0xf0 }, { 0x301c, 0xf0 }, { 0x301a, 0xf0 }, { 0x6f00, 0xc3 },
+	{ 0xc46a, 0x30 }, { 0xc46d, 0x20 }, { 0xc464, 0x84 }, { 0xc465, 0x00 },
+	{ 0x6f00, 0x03 }, { 0x6f00, 0x43 }, { 0x381c, 0x00 }, { 0x381d, 0x40 },
+	{ 0xc454, 0x01 }, { 0x6f00, 0xc3 }, { 0xc454, 0x00 }, { 0xc4b1, 0x02 },
+	{ 0xc4b2, 0x01 }, { 0xc4b3, 0x03 }, { 0x6f00, 0x03 }, { 0x6f00, 0x43 },
+	/* enable FSIN (FRAMESYNC input) functionality */
+	{ 0x3832, (0x0d + 2 * 0x20 + 0x15 + 38) >> 8 },
+	{ 0x3833, (0x0d + 2 * 0x20 + 0x15 + 38) & 0xff },
+	{ 0x3834, OV10635_VTS >> 8 }, { 0x3835, OV10635_VTS & 0xff },
+	{ 0x302e, 0x01 },
+};
+
+struct rdacm20_device {
+	struct device			*dev;
+	struct max9271_device		*serializer;
+	struct i2c_client		*sensor;
+	struct v4l2_subdev		sd;
+	struct media_pad		pad;
+	struct v4l2_ctrl_handler	ctrls;
+	u32				addrs[2];
+};
+
+static inline struct rdacm20_device *sd_to_rdacm20(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct rdacm20_device, sd);
+}
+
+static inline struct rdacm20_device *i2c_to_rdacm20(struct i2c_client *client)
+{
+	return sd_to_rdacm20(i2c_get_clientdata(client));
+}
+
+static int ov10635_read16(struct rdacm20_device *dev, u16 reg)
+{
+	u8 buf[2] = { reg >> 8, reg & 0xff };
+	int ret;
+
+	ret = i2c_master_send(dev->sensor, buf, 2);
+	if (ret != 2) {
+		dev_dbg(dev->dev, "%s: register 0x%04x write failed (%d)\n",
+			__func__, reg, ret);
+		return ret;
+	}
+
+	ret = i2c_master_recv(dev->sensor, buf, 2);
+	if (ret < 0) {
+		dev_dbg(dev->dev, "%s: register 0x%04x read failed (%d)\n",
+			__func__, reg, ret);
+		return ret;
+	}
+
+	return (buf[0] << 8) | buf[1];
+}
+
+static int __ov10635_write(struct rdacm20_device *dev, u16 reg, u8 val)
+{
+	u8 buf[3] = { reg >> 8, reg & 0xff, val };
+	int ret;
+
+	dev_dbg(dev->dev, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
+
+	ret = i2c_master_send(dev->sensor, buf, 3);
+	return ret < 0 ? ret : 0;
+}
+
+static int ov10635_write(struct rdacm20_device *dev, u16 reg, u8 val)
+{
+	int ret;
+
+	ret = __ov10635_write(dev, reg, val);
+	if (ret < 0)
+		dev_err(dev->dev, "%s: register 0x%04x write failed (%d)\n",
+			__func__, reg, ret);
+
+	return ret;
+}
+
+static int ov10635_set_regs(struct rdacm20_device *dev,
+			    const struct ov10635_reg *regs,
+			    unsigned int nr_regs)
+{
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < nr_regs; i++) {
+		ret = __ov10635_write(dev, regs[i].reg, regs[i].val);
+		if (ret) {
+			dev_err(dev->dev,
+				"%s: register %u (0x%04x) write failed (%d)\n",
+				__func__, i, regs[i].reg, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int rdacm20_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct rdacm20_device *dev = sd_to_rdacm20(sd);
+
+	return max9271_set_serial_link(dev->serializer, enable);
+}
+
+static int rdacm20_enum_mbus_code(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->pad || code->index > 0)
+		return -EINVAL;
+
+	code->code = OV10635_FORMAT;
+
+	return 0;
+}
+
+static int rdacm20_get_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *format)
+{
+	struct v4l2_mbus_framefmt *mf = &format->format;
+
+	if (format->pad)
+		return -EINVAL;
+
+	mf->width		= OV10635_WIDTH;
+	mf->height		= OV10635_HEIGHT;
+	mf->code		= OV10635_FORMAT;
+	mf->colorspace		= V4L2_COLORSPACE_RAW;
+	mf->field		= V4L2_FIELD_NONE;
+	mf->ycbcr_enc		= V4L2_YCBCR_ENC_601;
+	mf->quantization	= V4L2_QUANTIZATION_FULL_RANGE;
+	mf->xfer_func		= V4L2_XFER_FUNC_NONE;
+
+	return 0;
+}
+
+static struct v4l2_subdev_video_ops rdacm20_video_ops = {
+	.s_stream	= rdacm20_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops rdacm20_subdev_pad_ops = {
+	.enum_mbus_code = rdacm20_enum_mbus_code,
+	.get_fmt	= rdacm20_get_fmt,
+	.set_fmt	= rdacm20_get_fmt,
+};
+
+static struct v4l2_subdev_ops rdacm20_subdev_ops = {
+	.video		= &rdacm20_video_ops,
+	.pad		= &rdacm20_subdev_pad_ops,
+};
+
+static int rdacm20_initialize(struct rdacm20_device *dev)
+{
+	unsigned int retry = 3;
+	int ret;
+
+	/* Verify communication with the MAX9271: ping to wakeup. */
+	dev->serializer->client->addr = MAX9271_DEFAULT_ADDR;
+	i2c_smbus_read_byte(dev->serializer->client);
+
+	/* Serial link disabled during config as it needs a valid pixel clock. */
+	ret = max9271_set_serial_link(dev->serializer, false);
+	if (ret)
+		return ret;
+
+	/*
+	 *  Ensure that we have a good link configuration before attempting to
+	 *  identify the device.
+	 */
+	max9271_configure_i2c(dev->serializer, MAX9271_I2CSLVSH_469NS_234NS |
+					       MAX9271_I2CSLVTO_1024US |
+					       MAX9271_I2CMSTBT_105KBPS);
+
+	max9271_configure_gmsl_link(dev->serializer);
+
+	ret = max9271_verify_id(dev->serializer);
+	if (ret < 0)
+		return ret;
+
+	ret = max9271_set_address(dev->serializer, dev->addrs[0]);
+	if (ret < 0)
+		return ret;
+	dev->serializer->client->addr = dev->addrs[0];
+
+	/*
+	 * Reset the sensor by cycling the OV10635 reset signal connected to the
+	 * MAX9271 GPIO1 and verify communication with the OV10635.
+	 */
+	max9271_clear_gpios(dev->serializer, MAX9271_GPIO1OUT);
+	mdelay(10);
+	max9271_set_gpios(dev->serializer, MAX9271_GPIO1OUT);
+	mdelay(10);
+
+again:
+	ret = ov10635_read16(dev, OV10635_PID);
+	if (ret < 0) {
+		if (retry--)
+			goto again;
+
+		dev_err(dev->dev, "OV10635 ID read failed (%d)\n",
+			ret);
+		return -ENXIO;
+	}
+
+	if (ret != OV10635_VERSION) {
+		if (retry--)
+			goto again;
+
+		dev_err(dev->dev, "OV10635 ID mismatch (0x%04x)\n",
+			ret);
+		return -ENXIO;
+	}
+
+	/* Change the sensor I2C address. */
+	ret = ov10635_write(dev, OV10635_SC_CMMN_SCCB_ID,
+			    (dev->addrs[1] << 1) |
+			    OV10635_SC_CMMN_SCCB_ID_SELECT);
+	if (ret < 0) {
+		dev_err(dev->dev,
+			"OV10635 I2C address change failed (%d)\n", ret);
+		return ret;
+	}
+	dev->sensor->addr = dev->addrs[1];
+	usleep_range(3500, 5000);
+
+	/* Program the 0V10635 initial configuration. */
+	ret = ov10635_set_regs(dev, ov10635_regs_wizard,
+			       ARRAY_SIZE(ov10635_regs_wizard));
+	if (ret)
+		return ret;
+
+	dev_info(dev->dev, "Identified MAX9271 + OV10635 device\n");
+
+	return 0;
+}
+
+static int rdacm20_probe(struct i2c_client *client)
+{
+	struct rdacm20_device *dev;
+	struct fwnode_handle *ep;
+	int ret;
+
+	dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+	dev->dev = &client->dev;
+
+	dev->serializer = devm_kzalloc(&client->dev, sizeof(*dev->serializer),
+				       GFP_KERNEL);
+	if (!dev->serializer)
+		return -ENOMEM;
+
+	dev->serializer->client = client;
+
+	ret = of_property_read_u32_array(client->dev.of_node, "reg",
+					 dev->addrs, 2);
+	if (ret < 0) {
+		dev_err(dev->dev, "Invalid DT reg property: %d\n", ret);
+		return -EINVAL;
+	}
+
+	/* Create the dummy I2C client for the sensor. */
+	dev->sensor = i2c_new_dummy_device(client->adapter,
+					   OV10635_I2C_ADDRESS);
+	if (IS_ERR(dev->sensor)) {
+		ret = PTR_ERR(dev->sensor);
+		goto error;
+	}
+
+	/* Initialize the hardware. */
+	ret = rdacm20_initialize(dev);
+	if (ret < 0)
+		goto error;
+
+	/* Initialize and register the subdevice. */
+	v4l2_i2c_subdev_init(&dev->sd, client, &rdacm20_subdev_ops);
+	dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	v4l2_ctrl_handler_init(&dev->ctrls, 1);
+	v4l2_ctrl_new_std(&dev->ctrls, NULL, V4L2_CID_PIXEL_RATE,
+			  OV10635_PIXEL_RATE, OV10635_PIXEL_RATE, 1,
+			  OV10635_PIXEL_RATE);
+	dev->sd.ctrl_handler = &dev->ctrls;
+
+	ret = dev->ctrls.error;
+	if (ret)
+		goto error_free_ctrls;
+
+	dev->pad.flags = MEDIA_PAD_FL_SOURCE;
+	dev->sd.entity.flags |= MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
+	if (ret < 0)
+		goto error_free_ctrls;
+
+	ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev), NULL);
+	if (!ep) {
+		dev_err(&client->dev,
+			"Unable to get endpoint in node %pOF\n",
+			client->dev.of_node);
+		ret = -ENOENT;
+		goto error_free_ctrls;
+	}
+	dev->sd.fwnode = ep;
+
+	ret = v4l2_async_register_subdev(&dev->sd);
+	if (ret)
+		goto error_put_node;
+
+	return 0;
+
+error_put_node:
+	fwnode_handle_put(ep);
+error_free_ctrls:
+	v4l2_ctrl_handler_free(&dev->ctrls);
+error:
+	media_entity_cleanup(&dev->sd.entity);
+	if (dev->sensor)
+		i2c_unregister_device(dev->sensor);
+
+	dev_err(&client->dev, "probe failed\n");
+
+	return ret;
+}
+
+static int rdacm20_remove(struct i2c_client *client)
+{
+	struct rdacm20_device *dev = i2c_to_rdacm20(client);
+
+	fwnode_handle_put(dev->sd.fwnode);
+	v4l2_async_unregister_subdev(&dev->sd);
+	v4l2_ctrl_handler_free(&dev->ctrls);
+	media_entity_cleanup(&dev->sd.entity);
+	i2c_unregister_device(dev->sensor);
+
+	return 0;
+}
+
+static void rdacm20_shutdown(struct i2c_client *client)
+{
+	struct rdacm20_device *dev = i2c_to_rdacm20(client);
+
+	/* make sure stream off during shutdown (reset/reboot) */
+	rdacm20_s_stream(&dev->sd, 0);
+}
+
+static const struct of_device_id rdacm20_of_ids[] = {
+	{ .compatible = "imi,rdacm20", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rdacm20_of_ids);
+
+static struct i2c_driver rdacm20_i2c_driver = {
+	.driver	= {
+		.name	= "rdacm20",
+		.of_match_table = rdacm20_of_ids,
+	},
+	.probe_new	= rdacm20_probe,
+	.remove		= rdacm20_remove,
+	.shutdown	= rdacm20_shutdown,
+};
+
+module_i2c_driver(rdacm20_i2c_driver);
+
+MODULE_DESCRIPTION("GMSL Camera driver for RDACM20");
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_LICENSE("GPL");
-- 
2.26.0

Re: [v8-rc1 14/20] squash! max9286: Calculate pixel rate

[Kieran Bingham]

Hi Jacopo,

There we go - looks like a viable solution to me.

I wonder/suspect if this is the issue the BSP team were having some
weeks ago too?

Anyway, I'm certainly happy with this.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>


On 16/04/2020 11:40, Jacopo Mondi wrote:
> Calculate the CSI-2 transmitter pixel rate using the one reported from
> sources.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  drivers/media/i2c/max9286.c | 50 +++++++++++++++++++++++++++++--------
>  1 file changed, 40 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
> index 2d71205a1aad..3ef74ba10074 100644
> --- a/drivers/media/i2c/max9286.c
> +++ b/drivers/media/i2c/max9286.c
> @@ -430,9 +430,46 @@ static int max9286_check_config_link(struct max9286_priv *priv,
>   * V4L2 Subdev
>   */
>  
> -static int max9286_set_pixelrate(struct max9286_priv *priv, s64 rate)
> +static int max9286_set_pixelrate(struct max9286_priv *priv)
>  {
> -	return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, rate);
> +	struct max9286_source *source = NULL;
> +	u64 pixelrate = 0;
> +
> +	for_each_source(priv, source) {
> +		struct v4l2_ctrl *ctrl;
> +		u64 source_rate = 0;
> +
> +		/* Pixel rate is mandatory to be reported by sources. */
> +		ctrl = v4l2_ctrl_find(source->sd->ctrl_handler,
> +				      V4L2_CID_PIXEL_RATE);
> +		if (!ctrl) {
> +			pixelrate = 0;
> +			break;
> +		}
> +
> +		/* All source must report the same pixel rate. */
> +		source_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
> +		if (!pixelrate) {
> +			pixelrate = source_rate;
> +		} else if (pixelrate != source_rate) {
> +			dev_err(&priv->client->dev,
> +				"Unable to calculate pixel rate\n");

Hrm ... I would report "Source pixel rates are different\n"
 ... but I don't think that's a big deal.


> +			return -EINVAL;
> +		}
> +	}
> +
> +	if (!pixelrate) {
> +		dev_err(&priv->client->dev,
> +			"No pixel rate control available in sources\n");
> +		return -EINVAL;
> +	}
> +
> +	/*
> +	 * The CSI-2 transmitter pixel rate is the single source rate multiplied
> +	 * by the number of available sources.
> +	 */
> +	return v4l2_ctrl_s_ctrl_int64(priv->pixelrate,
> +				      pixelrate * priv->nsources);
>  }
>  
>  static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
> @@ -496,7 +533,7 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
>  	 */
>  	max9286_configure_i2c(priv, false);
>  
> -	return 0;
> +	return max9286_set_pixelrate(priv);

Aha - at first I thought this would call for every bind event, but we
already filter so this tail end of the function only executes on the
last bind :-)



>  }
>  
>  static void max9286_notify_unbind(struct v4l2_async_notifier *notifier,
> @@ -670,7 +707,6 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
>  {
>  	struct max9286_priv *priv = sd_to_max9286(sd);
>  	struct v4l2_mbus_framefmt *cfg_fmt;
> -	s64 pixelrate;
>  
>  	if (format->pad >= MAX9286_SRC_PAD)
>  		return -EINVAL;
> @@ -695,12 +731,6 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
>  	*cfg_fmt = format->format;
>  	mutex_unlock(&priv->mutex);
>  
> -	/* Update pixel rate for the CSI2 receiver */
> -	pixelrate = cfg_fmt->width * cfg_fmt->height
> -		  * priv->nsources * 30 /*FPS*/;
> -
> -	max9286_set_pixelrate(priv, pixelrate);
> -
>  	return 0;
>  }
>  
> 

Re: [v8-rc1 15/20] squash! max9286: Disable overlap window

[Kieran Bingham]

Hi Jacopo,

On 16/04/2020 11:40, Jacopo Mondi wrote:
> From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> 
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> 
> ---
> v2:
>   [Jacopo]
>   - Write register 0x63 and 0x64 directly as going through the function
>     breaks RDACM21 operations
> ---
>  drivers/media/i2c/max9286.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
> index 3ef74ba10074..e0c637d4a7de 100644
> --- a/drivers/media/i2c/max9286.c
> +++ b/drivers/media/i2c/max9286.c
> @@ -966,6 +966,18 @@ static int max9286_setup(struct max9286_priv *priv)
>  	max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
>  		      MAX9286_HVSRC_D14);
>  
> +	/*
> +	 * The overlap window seems to provide additional validation by tracking
> +	 * the delay between vsync and frame sync, generating an error if the
> +	 * delay is bigger than the programmed window, though it's not yet clear
> +	 * what value should be set.
> +	 *
> +	 * As it's an optional value and can be disabled, we do so by setting
> +	 * a 0 overlap value.

Are you happy to add the following as part of the removal of the function?

	 *
	 * The overlap window is a 13 bit value, and register 0x64 is
	 * shared with ENFSINLAST in BIT(5) which is also set zero.
	 *

> +	 */
> +	max9286_write(priv, 0x63, 0);
> +	max9286_write(priv, 0x64, 0);
> +
>  	/*
>  	 * Wait for 2ms to allow the link to resynchronize after the
>  	 * configuration change.
> 

Re: [v8-rc1 03/20] squash!: max9286: Rebase on latest media/master

[Kieran Bingham]

Hi Jacopo,

On 16/04/2020 11:40, Jacopo Mondi wrote:
> Adapt Kconfig to latest upstream changes
> Fixes: 32a363d0b0b1 ("media: Kconfig files: use select for V4L2 subdevs and MC")

Aha, I hadn't hit this yet, I guess this is part of the move to the
/next/ linux-media/master :-D

Thanks.

Oh - I see - it's just a change in 'policy'.

Well - it matches the tree so ...

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>


> ---
>  drivers/media/i2c/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 04186787a2f0..5d810f6f230e 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -467,8 +467,9 @@ config VIDEO_VPX3220
>  config VIDEO_MAX9286
>  	tristate "Maxim MAX9286 GMSL deserializer support"
>  	depends on I2C && I2C_MUX
> -	depends on VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
>  	select V4L2_FWNODE
> +	select VIDEO_V4L2_SUBDEV_API
> +	select MEDIA_CONTROLLER
>  	help
>  	  This driver supports the Maxim MAX9286 GMSL deserializer.
>  
> 

Re: [v8-rc1 20/20] media: i2c: Add RDACM20 driver

[Jacopo Mondi]

Hello again,
   forgot to copy&paste the patch changelog.

On Thu, Apr 16, 2020 at 12:40:52PM +0200, Jacopo Mondi wrote:
> The RDACM20 is a GMSL camera supporting 1280x800 resolution images
> developed by IMI based on an Omnivision 10635 sensor and a Maxim MAX9271
> GMSL serializer.
>
> The GMSL link carries power, control (I2C) and video data over a
> single coax cable.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
>
> ---
> v2:
>  - Fix MAINTAINERS entry
>
> v3:
>  - Use new V4L2_MBUS_CSI2_DPHY bus type
>  - Remove 'always zero' error print
>  - Fix module description
>
> v5:
>  - use sleep rather than busy loops for 10 ms delays
>  - Return ov10635_set_regs directly
>  - Use devm_kzalloc instead of kzalloc in probe()
>  - Or in the flags: dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE
>  - Ensure v4l2_ctrl_handler_free() is called
>  - rdacm20_probe converted to use .probe_new and drop i2c device id
>    tables
>  - Remove rdacm20_g_mbus_config
>
> v7:
>  - Use new i2c_new_dummy_device API

   v8:
     - Almost a new version, main changes are:
       - Split max9271 out
       - Rework bindings to yaml format and include forthcoming RDACM21
       - Remove unecessary header file
       - Add pixel rate calculation
       - Drop unused fields and dead code
       - Rebase on media-master v5.7-rc1
       - A detailed list of changes provided as fixup patches is avilable at
         git://jmondi.org/linux #gmsl/jmondi/media-master/max9286-v8+old-rdacm20+split

         which includes the following list of patches:
             squash!: rdacm20: Report pixel rate
             squash!: rdacm20: Force sensor ID re-read
             squash!: rdamc20: Check register programming result
             squash!: rdacm20: Update to use the new max9271 APIs
             squash!: rdacm20: Start with serial link disabled
             squash!: rdacm20: Hard reset the sensor
             squash!: rdacm20: Cache i2c addresses
             squash!: rdacm20: Adjust to use new max9271 API
             squash!: rdacm20: Drop unused format definition
             squash!: rdacm20: Refresh file header
             squash!: max9271: Add two functions to control addresses
             squash!: max9271: Do not rewrite i2c address
             squash!: max9271: Improve gpio handling
             squash!: max9271: Rework core functions
             squash!: max9271 refresh
             squash!: rdacm20: Update maintainers file
             squash!: rdacm20: Remove unsued/duplicated defines
             squash!: rdacm20: Remove header file
             squash!: rdacm20: Move content of  header into C file
             squash!: rdacm20: Reorganize register table
             squash!: rdacm20: Fix subdevice flag creation
             squash!: rdacm20: Drop i2c id table
             squash!: rdacm20: Release control handler
             squash!: rdacm20: Better handle i2c dummy error
             squash!: rdacm20: Use devm_kzalloc
             squash!: rdacm20: Use probe_new()
             squash!: rdacm20: Drop deprecated g_mbus_config
             media: i2c: rdacm20: Break max9271 out from rdacm20
             squash!: rdacm20: Rebase on latest media/maste
             media: i2c: Add RDACM20 driver
             dt-bindings: media: i2c: Add bindings for IMI RDACM2x
> ---
>  MAINTAINERS                 |  12 +
>  drivers/media/i2c/Kconfig   |  13 +
>  drivers/media/i2c/Makefile  |   2 +
>  drivers/media/i2c/max9271.c | 330 ++++++++++++++++++
>  drivers/media/i2c/max9271.h | 224 ++++++++++++
>  drivers/media/i2c/rdacm20.c | 668 ++++++++++++++++++++++++++++++++++++
>  6 files changed, 1249 insertions(+)
>  create mode 100644 drivers/media/i2c/max9271.c
>  create mode 100644 drivers/media/i2c/max9271.h
>  create mode 100644 drivers/media/i2c/rdacm20.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 242ec17644c3..47930cd43ef3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14197,6 +14197,18 @@ S:	Supported
>  T:	git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
>  F:	tools/testing/selftests/rcutorture
>
> +RDACM20 Camera Sensor
> +M:	Jacopo Mondi <jacopo+renesas@jmondi.org>
> +M:	Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> +M:	Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> +M:	Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> +L:	linux-media@vger.kernel.org
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
> +F:	drivers/media/i2c/rdacm20.c
> +F:	drivers/media/i2c/max9271.c
> +F:	drivers/media/i2c/max9271.h
> +
>  RDC R-321X SoC
>  M:	Florian Fainelli <florian@openwrt.org>
>  S:	Maintained
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 5d810f6f230e..e5d6dced20e0 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -1156,6 +1156,19 @@ config VIDEO_NOON010PC30
>
>  source "drivers/media/i2c/m5mols/Kconfig"
>
> +config VIDEO_RDACM20
> +	tristate "IMI RDACM20 camera support"
> +	depends on I2C
> +	select V4L2_FWNODE
> +	select VIDEO_V4L2_SUBDEV_API
> +	select MEDIA_CONTROLLER
> +	help
> +	  This driver supports the IMI RDACM20 GMSL camera, used in
> +	  ADAS systems.
> +
> +	  This camera should be used in conjunction with a GMSL
> +	  deserialiser such as the MAX9286.
> +
>  config VIDEO_RJ54N1
>  	tristate "Sharp RJ54N1CB0C sensor support"
>  	depends on I2C && VIDEO_V4L2
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index 29379008d624..93baaca8469e 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -119,5 +119,7 @@ obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
>  obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
>  obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
>  obj-$(CONFIG_VIDEO_MAX9286)	+= max9286.o
> +rdacm20-camera_module-objs	:= rdacm20.o max9271.o
> +obj-$(CONFIG_VIDEO_RDACM20)	+= rdacm20-camera_module.o
>
>  obj-$(CONFIG_SDR_MAX2175) += max2175.o
> diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c
> new file mode 100644
> index 000000000000..0fde36e9a8c7
> --- /dev/null
> +++ b/drivers/media/i2c/max9271.c
> @@ -0,0 +1,330 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2017-2020 Jacopo Mondi
> + * Copyright (C) 2017-2020 Kieran Bingham
> + * Copyright (C) 2017-2020 Laurent Pinchart
> + * Copyright (C) 2017-2020 Niklas Söderlund
> + * Copyright (C) 2016 Renesas Electronics Corporation
> + * Copyright (C) 2015 Cogent Embedded, Inc.
> + *
> + * This file exports functions to control Maxim MAX9271 GMSL serializer
> + * chip. This is not a self-contained driver, as MAX9271 is usually embedded in
> + * camera modules with at least one image sensor and optional additional
> + * components, such as uController units or ISPs/DSPs.
> + *
> + * Drivers for the camera modules (ie rdacm20/21) are expected to use functions
> + * exported from this library driver to maximize code re-use across.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +
> +#include "max9271.h"
> +
> +static int max9271_read(struct max9271_device *dev, u8 reg)
> +{
> +	int ret;
> +
> +	dev_dbg(&dev->client->dev, "%s(0x%02x)\n", __func__, reg);
> +
> +	ret = i2c_smbus_read_byte_data(dev->client, reg);
> +	if (ret < 0)
> +		dev_dbg(&dev->client->dev,
> +			"%s: register 0x%02x read failed (%d)\n",
> +			__func__, reg, ret);
> +
> +	return ret;
> +}
> +
> +static int max9271_write(struct max9271_device *dev, u8 reg, u8 val)
> +{
> +	int ret;
> +
> +	dev_dbg(&dev->client->dev, "%s(0x%02x, 0x%02x)\n", __func__, reg, val);
> +
> +	ret = i2c_smbus_write_byte_data(dev->client, reg, val);
> +	if (ret < 0)
> +		dev_err(&dev->client->dev,
> +			"%s: register 0x%02x write failed (%d)\n",
> +			__func__, reg, ret);
> +
> +	return ret;
> +}
> +
> +/*
> + * max9271_pclk_detect() - Detect valid pixel clock from image sensor
> + *
> + * Wait up to 10ms for a valid pixel clock.
> + *
> + * Returns 0 for success, < 0 for pixel clock not properly detected
> + */
> +static int max9271_pclk_detect(struct max9271_device *dev)
> +{
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < 100; i++) {
> +		ret = max9271_read(dev, 0x15);
> +		if (ret < 0)
> +			return ret;
> +
> +		if (ret & MAX9271_PCLKDET)
> +			return 0;
> +
> +		usleep_range(50, 100);
> +	}
> +
> +	dev_err(&dev->client->dev, "Unable to detect valid pixel clock\n");
> +	return -EIO;
> +}
> +
> +int max9271_set_serial_link(struct max9271_device *dev, bool enable)
> +{
> +	int ret;
> +	u8 val = MAX9271_REVCCEN | MAX9271_FWDCCEN;
> +
> +	if (enable) {
> +		ret = max9271_pclk_detect(dev);
> +		if (ret)
> +			return ret;
> +
> +		val |= MAX9271_SEREN;
> +	} else {
> +		val |= MAX9271_CLINKEN;
> +	}
> +
> +	/*
> +	 * The serializer temporarily disables the reverse control channel for
> +	 * 350µs after starting/stopping the forward serial link, but the
> +	 * deserializer synchronization time isn't clearly documented.
> +	 *
> +	 * According to the serializer datasheet we should wait 3ms, while
> +	 * according to the deserializer datasheet we should wait 5ms.
> +	 *
> +	 * Short delays here appear to show bit-errors in the writes following.
> +	 * Therefore a conservative delay seems best here.
> +	 */
> +	max9271_write(dev, 0x04, val);
> +	usleep_range(5000, 8000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_set_serial_link);
> +
> +int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config)
> +{
> +	int ret;
> +
> +	ret = max9271_write(dev, 0x0d, i2c_config);
> +	if (ret)
> +		return ret;
> +
> +	/* The delay required after an I2C bus configuration change is not
> +	 * characterized in the serializer manual. Sleep up to 5msec to
> +	 * stay safe.
> +	 */
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_configure_i2c);
> +
> +int max9271_set_high_threshold(struct max9271_device *dev, bool enable)
> +{
> +	int ret = max9271_read(dev, 0x08);
> +	if (ret < 0)
> +		return ret;
> +
> +	/*
> +	 * Enable or disable reverse channel high threshold to increase
> +	 * immunity to power supply noise.
> +	 */
> +	max9271_write(dev, 0x08, enable ? ret | BIT(0) : ret & ~BIT(0));
> +	usleep_range(2000, 2500);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_set_high_threshold);
> +
> +int max9271_configure_gmsl_link(struct max9271_device *dev)
> +{
> +	/*
> +	 * Configure the GMSL link:
> +	 *
> +	 * - Double input mode, high data rate, 24-bit mode
> +	 * - Latch input data on PCLKIN rising edge
> +	 * - Enable HS/VS encoding
> +	 * - 1-bit parity error detection
> +	 *
> +	 * TODO: Make the GMSL link configuration parametric.
> +	 */
> +	max9271_write(dev, 0x07, MAX9271_DBL | MAX9271_HVEN |
> +		      MAX9271_EDC_1BIT_PARITY);
> +	usleep_range(5000, 8000);
> +
> +	/*
> +	 * Adjust spread spectrum to +4% and auto-detect pixel clock
> +	 * and serial link rate.
> +	 */
> +	max9271_write(dev, 0x02, MAX9271_SPREAD_SPECT_4 | MAX9271_R02_RES |
> +		      MAX9271_PCLK_AUTODETECT | MAX9271_SERIAL_AUTODETECT);
> +	usleep_range(5000, 8000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_configure_gmsl_link);
> +
> +int max9271_set_gpios(struct max9271_device *dev, u8 gpio_mask)
> +{
> +	int ret = max9271_read(dev, 0x0f);
> +	if (ret < 0)
> +		return 0;
> +
> +	ret |= gpio_mask;
> +	ret = max9271_write(dev, 0x0f, ret);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev, "Failed to set gpio (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_set_gpios);
> +
> +int max9271_clear_gpios(struct max9271_device *dev, u8 gpio_mask)
> +{
> +	int ret = max9271_read(dev, 0x0f);
> +	if (ret < 0)
> +		return 0;
> +
> +	ret &= ~gpio_mask;
> +	ret = max9271_write(dev, 0x0f, ret);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev, "Failed to clear gpio (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_clear_gpios);
> +
> +int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask)
> +{
> +	int ret = max9271_read(dev, 0x0f);
> +	if (ret < 0)
> +		return 0;
> +
> +	/* BIT(0) reserved: GPO is always enabled. */
> +	ret |= gpio_mask | BIT(0);
> +	ret = max9271_write(dev, 0x0e, ret);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev, "Failed to enable gpio (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_enable_gpios);
> +
> +int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask)
> +{
> +	int ret = max9271_read(dev, 0x0f);
> +	if (ret < 0)
> +		return 0;
> +
> +	/* BIT(0) reserved: GPO cannot be disabled */
> +	ret &= (~gpio_mask | BIT(0));
> +	ret = max9271_write(dev, 0x0e, ret);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev, "Failed to disable gpio (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_disable_gpios);
> +
> +int max9271_verify_id(struct max9271_device *dev)
> +{
> +	int ret;
> +
> +	ret = max9271_read(dev, 0x1e);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev, "MAX9271 ID read failed (%d)\n",
> +			ret);
> +		return ret;
> +	}
> +
> +	if (ret != MAX9271_ID) {
> +		dev_err(&dev->client->dev, "MAX9271 ID mismatch (0x%02x)\n",
> +			ret);
> +		return -ENXIO;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_verify_id);
> +
> +int max9271_set_address(struct max9271_device *dev, u8 addr)
> +{
> +	int ret;
> +
> +	ret = max9271_write(dev, 0x00, addr << 1);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev,
> +			"MAX9271 I2C address change failed (%d)\n", ret);
> +		return ret;
> +	}
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_set_address);
> +
> +int max9271_set_deserializer_address(struct max9271_device *dev, u8 addr)
> +{
> +	int ret;
> +
> +	ret = max9271_write(dev, 0x01, addr << 1);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev,
> +			"MAX9271 deserializer address set failed (%d)\n", ret);
> +		return ret;
> +	}
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_set_deserializer_address);
> +
> +int max9271_set_translation(struct max9271_device *dev, u8 source, u8 dest)
> +{
> +	int ret;
> +
> +	ret = max9271_write(dev, 0x09, source << 1);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev,
> +			"MAX9271 I2C translation setup failed (%d)\n", ret);
> +		return ret;
> +	}
> +	usleep_range(3500, 5000);
> +
> +	ret = max9271_write(dev, 0x0a, dest << 1);
> +	if (ret < 0) {
> +		dev_err(&dev->client->dev,
> +			"MAX9271 I2C translation setup failed (%d)\n", ret);
> +		return ret;
> +	}
> +	usleep_range(3500, 5000);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(max9271_set_translation);
> diff --git a/drivers/media/i2c/max9271.h b/drivers/media/i2c/max9271.h
> new file mode 100644
> index 000000000000..d78fb21441e9
> --- /dev/null
> +++ b/drivers/media/i2c/max9271.h
> @@ -0,0 +1,224 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2017-2020 Jacopo Mondi
> + * Copyright (C) 2017-2020 Kieran Bingham
> + * Copyright (C) 2017-2020 Laurent Pinchart
> + * Copyright (C) 2017-2020 Niklas Söderlund
> + * Copyright (C) 2016 Renesas Electronics Corporation
> + * Copyright (C) 2015 Cogent Embedded, Inc.
> + */
> +
> +#include <linux/i2c.h>
> +
> +#define MAX9271_DEFAULT_ADDR	0x40
> +
> +/* Register 0x02 */
> +#define MAX9271_SPREAD_SPECT_0		(0 << 5)
> +#define MAX9271_SPREAD_SPECT_05		(1 << 5)
> +#define MAX9271_SPREAD_SPECT_15		(2 << 5)
> +#define MAX9271_SPREAD_SPECT_1		(5 << 5)
> +#define MAX9271_SPREAD_SPECT_2		(3 << 5)
> +#define MAX9271_SPREAD_SPECT_3		(6 << 5)
> +#define MAX9271_SPREAD_SPECT_4		(7 << 5)
> +#define MAX9271_R02_RES			BIT(4)
> +#define MAX9271_PCLK_AUTODETECT		(3 << 2)
> +#define MAX9271_SERIAL_AUTODETECT	(0x03)
> +/* Register 0x04 */
> +#define MAX9271_SEREN			BIT(7)
> +#define MAX9271_CLINKEN			BIT(6)
> +#define MAX9271_PRBSEN			BIT(5)
> +#define MAX9271_SLEEP			BIT(4)
> +#define MAX9271_INTTYPE_I2C		(0 << 2)
> +#define MAX9271_INTTYPE_UART		(1 << 2)
> +#define MAX9271_INTTYPE_NONE		(2 << 2)
> +#define MAX9271_REVCCEN			BIT(1)
> +#define MAX9271_FWDCCEN			BIT(0)
> +/* Register 0x07 */
> +#define MAX9271_DBL			BIT(7)
> +#define MAX9271_DRS			BIT(6)
> +#define MAX9271_BWS			BIT(5)
> +#define MAX9271_ES			BIT(4)
> +#define MAX9271_HVEN			BIT(2)
> +#define MAX9271_EDC_1BIT_PARITY		(0 << 0)
> +#define MAX9271_EDC_6BIT_CRC		(1 << 0)
> +#define MAX9271_EDC_6BIT_HAMMING	(2 << 0)
> +/* Register 0x08 */
> +#define MAX9271_INVVS			BIT(7)
> +#define MAX9271_INVHS			BIT(6)
> +#define MAX9271_REV_LOGAIN		BIT(3)
> +#define MAX9271_REV_HIVTH		BIT(0)
> +/* Register 0x09 */
> +#define MAX9271_ID			0x09
> +/* Register 0x0d */
> +#define MAX9271_I2CLOCACK		BIT(7)
> +#define MAX9271_I2CSLVSH_1046NS_469NS	(3 << 5)
> +#define MAX9271_I2CSLVSH_938NS_352NS	(2 << 5)
> +#define MAX9271_I2CSLVSH_469NS_234NS	(1 << 5)
> +#define MAX9271_I2CSLVSH_352NS_117NS	(0 << 5)
> +#define MAX9271_I2CMSTBT_837KBPS	(7 << 2)
> +#define MAX9271_I2CMSTBT_533KBPS	(6 << 2)
> +#define MAX9271_I2CMSTBT_339KBPS	(5 << 2)
> +#define MAX9271_I2CMSTBT_173KBPS	(4 << 2)
> +#define MAX9271_I2CMSTBT_105KBPS	(3 << 2)
> +#define MAX9271_I2CMSTBT_84KBPS		(2 << 2)
> +#define MAX9271_I2CMSTBT_28KBPS		(1 << 2)
> +#define MAX9271_I2CMSTBT_8KBPS		(0 << 2)
> +#define MAX9271_I2CSLVTO_NONE		(3 << 0)
> +#define MAX9271_I2CSLVTO_1024US		(2 << 0)
> +#define MAX9271_I2CSLVTO_256US		(1 << 0)
> +#define MAX9271_I2CSLVTO_64US		(0 << 0)
> +/* Register 0x0f */
> +#define MAX9271_GPIO5OUT		BIT(5)
> +#define MAX9271_GPIO4OUT		BIT(4)
> +#define MAX9271_GPIO3OUT		BIT(3)
> +#define MAX9271_GPIO2OUT		BIT(2)
> +#define MAX9271_GPIO1OUT		BIT(1)
> +#define MAX9271_GPO			BIT(0)
> +/* Register 0x15 */
> +#define MAX9271_PCLKDET			BIT(0)
> +
> +/**
> + * struct max9271_device - max9271 device
> + * @client: The i2c client for the max9271 instance
> + */
> +struct max9271_device {
> +	struct i2c_client *client;
> +};
> +
> +/**
> + * max9271_set_serial_link() - Enable/disable serial link
> + * @dev: The max9271 device
> + * @enable: Serial link enable/disable flag
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_set_serial_link(struct max9271_device *dev, bool enable);
> +
> +/**
> + * max9271_configure_i2c() - Configure I2C bus parameters
> + * @dev: The max9271 device
> + * @i2c_config: The I2C bus configuration bit mask
> + *
> + * Configure MAX9271 I2C interface. The bus configuration provided in the
> + * @i2c_config parameter shall be assembled using bit values defined by the
> + * MAX9271_I2C* macros.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config);
> +
> +/**
> + * max9271_set_high_threshold() - Enable or disable reverse channel high
> + *				  threshold
> + * @dev: The max9271 device
> + * @enable: High threshold enable/disable flag
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_set_high_threshold(struct max9271_device *dev, bool enable);
> +
> +/**
> + * max9271_configure_gmsl_link() - Configure the GMSL link
> + * @dev: The max9271 device
> + *
> + * FIXME: the GMSL link configuration is currently hardcoded and performed
> + * by programming registers 0x04, 0x07 and 0x02.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_configure_gmsl_link(struct max9271_device *dev);
> +
> +/**
> + * max9271_set_gpios() - Set gpio lines to physical high value
> + * @dev: The max9271 device
> + * @gpio_mask: The mask of gpio lines to set to high value
> + *
> + * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]*
> + * bit values.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_set_gpios(struct max9271_device *dev, u8 gpio_mask);
> +
> +/**
> + * max9271_clear_gpios() - Set gpio lines to physical low value
> + * @dev: The max9271 device
> + * @gpio_mask: The mask of gpio lines to set to low value
> + *
> + * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]*
> + * bit values.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_clear_gpios(struct max9271_device *dev, u8 gpio_mask);
> +
> +/**
> + * max9271_enable_gpios() - Enable gpio lines
> + * @dev: The max9271 device
> + * @gpio_mask: The mask of gpio lines to enable
> + *
> + * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO*
> + * bit values. GPO line is always enabled by default.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask);
> +
> +/**
> + * max9271_disable_gpios() - Disable gpio lines
> + * @dev: The max9271 device
> + * @gpio_mask: The mask of gpio lines to disable
> + *
> + * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO*
> + * bit values. GPO line is always enabled by default and cannot be disabled.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask);
> +
> +/**
> + * max9271_verify_id() - Read and verify MAX9271 id
> + * @dev: The max9271 device
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_verify_id(struct max9271_device *dev);
> +
> +/**
> + * max9271_set_address() - Program a new I2C address
> + * @dev: The max9271 device
> + * @addr: The new I2C address in 7-bit format
> + *
> + * This function only takes care of programming the new I2C address @addr to
> + * in the MAX9271 chip registers, it is responsiblity of the caller to set
> + * the i2c address client to the @addr value to be able to communicate with
> + * the MAX9271 chip using the I2C framework APIs after this function returns.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_set_address(struct max9271_device *dev, u8 addr);
> +
> +/**
> + * max9271_set_deserializer_address() - Program the remote deserializer address
> + * @dev: The max9271 device
> + * @addr: The deserializer I2C address in 7-bit format
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_set_deserializer_address(struct max9271_device *dev, u8 addr);
> +
> +/**
> + * max9271_set_translation() - Program I2C address translation
> + * @dev: The max9271 device
> + * @source: The I2C source address
> + * @dest: The I2C destination address
> + *
> + * Program address translation from @source to @dest. This is required to
> + * communicate with local devices that do not support address reprogramming.
> + *
> + * TODO: The device supports translation of two address, this function currently
> + * supports a single one.
> + *
> + * Return 0 on success or a negative error code on failure
> + */
> +int max9271_set_translation(struct max9271_device *dev, u8 source, u8 dest);
> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> new file mode 100644
> index 000000000000..37786998878b
> --- /dev/null
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -0,0 +1,668 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * IMI RDACM20 GMSL Camera Driver
> + *
> + * Copyright (C) 2017-2020 Jacopo Mondi
> + * Copyright (C) 2017-2020 Kieran Bingham
> + * Copyright (C) 2017-2019 Laurent Pinchart
> + * Copyright (C) 2017-2019 Niklas Söderlund
> + * Copyright (C) 2016 Renesas Electronics Corporation
> + * Copyright (C) 2015 Cogent Embedded, Inc.
> + */
> +
> +/*
> + * The camera is made of an Omnivision OV10635 sensor connected to a Maxim
> + * MAX9271 GMSL serializer.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/fwnode.h>
> +#include <linux/init.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-subdev.h>
> +
> +#include "max9271.h"
> +
> +#define OV10635_I2C_ADDRESS		0x30
> +
> +#define OV10635_SOFTWARE_RESET		0x0103
> +#define OV10635_PID			0x300a
> +#define OV10635_VER			0x300b
> +#define OV10635_SC_CMMN_SCCB_ID		0x300c
> +#define OV10635_SC_CMMN_SCCB_ID_SELECT	BIT(0)
> +#define OV10635_VERSION			0xa635
> +
> +#define OV10635_WIDTH			1280
> +#define OV10635_HEIGHT			800
> +#define OV10635_FORMAT			MEDIA_BUS_FMT_UYVY8_2X8
> +
> +/* VTS = PCLK / FPS / HTS / 2 (= 88MHz / 1572 / 30 / 2) */
> +#define OV10635_HTS			1572
> +/* FPS = 29,9998 */
> +#define OV10635_VTS			933
> +
> +/*
> + * As the drivers supports a single MEDIA_BUS_FMT_UYVY8_2X8 format we
> + * can harcode the pixel rate.
> + *
> + * PCLK is fed through the system clock, programmed @88MHz.
> + * MEDIA_BUS_FMT_UYVY8_2X8 format = 2 samples per pixel.
> + *
> + * Pixelrate = PCLK / 2
> + * FPS = (OV10635_VTS * OV10635_HTS) / PixelRate
> + *     = 29,9998
> + */
> +#define OV10635_PIXEL_RATE		(44000000)
> +
> +static const struct ov10635_reg {
> +	u16	reg;
> +	u8	val;
> +} ov10635_regs_wizard[] = {
> +	{ 0x301b, 0xff }, { 0x301c, 0xff }, { 0x301a, 0xff }, { 0x3011, 0x42 },
> +	{ 0x6900, 0x0c }, { 0x6901, 0x19 }, { 0x3503, 0x10 }, { 0x3025, 0x03 },
> +	{ 0x3003, 0x16 }, { 0x3004, 0x30 }, { 0x3005, 0x40 }, { 0x3006, 0x91 },
> +	{ 0x3600, 0x74 }, { 0x3601, 0x2b }, { 0x3612, 0x00 }, { 0x3611, 0x67 },
> +	{ 0x3633, 0xca }, { 0x3602, 0xaf }, { 0x3603, 0x04 }, { 0x3630, 0x28 },
> +	{ 0x3631, 0x16 }, { 0x3714, 0x10 }, { 0x371d, 0x01 }, { 0x4300, 0x3a },
> +	{ 0x3007, 0x01 }, { 0x3024, 0x03 }, { 0x3020, 0x0a }, { 0x3702, 0x0d },
> +	{ 0x3703, 0x20 }, { 0x3704, 0x15 }, { 0x3709, 0xa8 }, { 0x370c, 0xc7 },
> +	{ 0x370d, 0x80 }, { 0x3712, 0x00 }, { 0x3713, 0x20 }, { 0x3715, 0x04 },
> +	{ 0x381d, 0x40 }, { 0x381c, 0x00 }, { 0x3822, 0x50 }, { 0x3824, 0x10 },
> +	{ 0x3815, 0x8c }, { 0x3804, 0x05 }, { 0x3805, 0x1f }, { 0x3800, 0x00 },
> +	{ 0x3801, 0x00 }, { 0x3806, 0x03 }, { 0x3807, 0x28 }, { 0x3802, 0x00 },
> +	{ 0x3803, 0x07 }, { 0x3808, 0x05 }, { 0x3809, 0x00 }, { 0x380a, 0x03 },
> +	{ 0x380b, 0x20 }, { 0x380c, OV10635_HTS >> 8 },
> +	{ 0x380d, OV10635_HTS & 0xff }, { 0x380e, OV10635_VTS >> 8 },
> +	{ 0x380f, OV10635_VTS & 0xff },	{ 0x3813, 0x02 }, { 0x3811, 0x08 },
> +	{ 0x381f, 0x0c }, { 0x3819, 0x04 }, { 0x3804, 0x01 }, { 0x3805, 0x00 },
> +	{ 0x3828, 0x03 }, { 0x3829, 0x10 }, { 0x382a, 0x10 }, { 0x3621, 0x63 },
> +	{ 0x5005, 0x08 }, { 0x56d5, 0x00 }, { 0x56d6, 0x80 }, { 0x56d7, 0x00 },
> +	{ 0x56d8, 0x00 }, { 0x56d9, 0x00 }, { 0x56da, 0x80 }, { 0x56db, 0x00 },
> +	{ 0x56dc, 0x00 }, { 0x56e8, 0x00 }, { 0x56e9, 0x7f }, { 0x56ea, 0x00 },
> +	{ 0x56eb, 0x7f }, { 0x5100, 0x00 }, { 0x5101, 0x80 }, { 0x5102, 0x00 },
> +	{ 0x5103, 0x80 }, { 0x5104, 0x00 }, { 0x5105, 0x80 }, { 0x5106, 0x00 },
> +	{ 0x5107, 0x80 }, { 0x5108, 0x00 }, { 0x5109, 0x00 }, { 0x510a, 0x00 },
> +	{ 0x510b, 0x00 }, { 0x510c, 0x00 }, { 0x510d, 0x00 }, { 0x510e, 0x00 },
> +	{ 0x510f, 0x00 }, { 0x5110, 0x00 }, { 0x5111, 0x80 }, { 0x5112, 0x00 },
> +	{ 0x5113, 0x80 }, { 0x5114, 0x00 }, { 0x5115, 0x80 }, { 0x5116, 0x00 },
> +	{ 0x5117, 0x80 }, { 0x5118, 0x00 }, { 0x5119, 0x00 }, { 0x511a, 0x00 },
> +	{ 0x511b, 0x00 }, { 0x511c, 0x00 }, { 0x511d, 0x00 }, { 0x511e, 0x00 },
> +	{ 0x511f, 0x00 }, { 0x56d0, 0x00 }, { 0x5006, 0x04 }, { 0x5608, 0x05 },
> +	{ 0x52d7, 0x06 }, { 0x528d, 0x08 }, { 0x5293, 0x12 }, { 0x52d3, 0x12 },
> +	{ 0x5288, 0x06 }, { 0x5289, 0x20 }, { 0x52c8, 0x06 }, { 0x52c9, 0x20 },
> +	{ 0x52cd, 0x04 }, { 0x5381, 0x00 }, { 0x5382, 0xff }, { 0x5589, 0x76 },
> +	{ 0x558a, 0x47 }, { 0x558b, 0xef }, { 0x558c, 0xc9 }, { 0x558d, 0x49 },
> +	{ 0x558e, 0x30 }, { 0x558f, 0x67 }, { 0x5590, 0x3f }, { 0x5591, 0xf0 },
> +	{ 0x5592, 0x10 }, { 0x55a2, 0x6d }, { 0x55a3, 0x55 }, { 0x55a4, 0xc3 },
> +	{ 0x55a5, 0xb5 }, { 0x55a6, 0x43 }, { 0x55a7, 0x38 }, { 0x55a8, 0x5f },
> +	{ 0x55a9, 0x4b }, { 0x55aa, 0xf0 }, { 0x55ab, 0x10 }, { 0x5581, 0x52 },
> +	{ 0x5300, 0x01 }, { 0x5301, 0x00 }, { 0x5302, 0x00 }, { 0x5303, 0x0e },
> +	{ 0x5304, 0x00 }, { 0x5305, 0x0e }, { 0x5306, 0x00 }, { 0x5307, 0x36 },
> +	{ 0x5308, 0x00 }, { 0x5309, 0xd9 }, { 0x530a, 0x00 }, { 0x530b, 0x0f },
> +	{ 0x530c, 0x00 }, { 0x530d, 0x2c }, { 0x530e, 0x00 }, { 0x530f, 0x59 },
> +	{ 0x5310, 0x00 }, { 0x5311, 0x7b }, { 0x5312, 0x00 }, { 0x5313, 0x22 },
> +	{ 0x5314, 0x00 }, { 0x5315, 0xd5 }, { 0x5316, 0x00 }, { 0x5317, 0x13 },
> +	{ 0x5318, 0x00 }, { 0x5319, 0x18 }, { 0x531a, 0x00 }, { 0x531b, 0x26 },
> +	{ 0x531c, 0x00 }, { 0x531d, 0xdc }, { 0x531e, 0x00 }, { 0x531f, 0x02 },
> +	{ 0x5320, 0x00 }, { 0x5321, 0x24 }, { 0x5322, 0x00 }, { 0x5323, 0x56 },
> +	{ 0x5324, 0x00 }, { 0x5325, 0x85 }, { 0x5326, 0x00 }, { 0x5327, 0x20 },
> +	{ 0x5609, 0x01 }, { 0x560a, 0x40 }, { 0x560b, 0x01 }, { 0x560c, 0x40 },
> +	{ 0x560d, 0x00 }, { 0x560e, 0xfa }, { 0x560f, 0x00 }, { 0x5610, 0xfa },
> +	{ 0x5611, 0x02 }, { 0x5612, 0x80 }, { 0x5613, 0x02 }, { 0x5614, 0x80 },
> +	{ 0x5615, 0x01 }, { 0x5616, 0x2c }, { 0x5617, 0x01 }, { 0x5618, 0x2c },
> +	{ 0x563b, 0x01 }, { 0x563c, 0x01 }, { 0x563d, 0x01 }, { 0x563e, 0x01 },
> +	{ 0x563f, 0x03 }, { 0x5640, 0x03 }, { 0x5641, 0x03 }, { 0x5642, 0x05 },
> +	{ 0x5643, 0x09 }, { 0x5644, 0x05 }, { 0x5645, 0x05 }, { 0x5646, 0x05 },
> +	{ 0x5647, 0x05 }, { 0x5651, 0x00 }, { 0x5652, 0x80 }, { 0x521a, 0x01 },
> +	{ 0x521b, 0x03 }, { 0x521c, 0x06 }, { 0x521d, 0x0a }, { 0x521e, 0x0e },
> +	{ 0x521f, 0x12 }, { 0x5220, 0x16 }, { 0x5223, 0x02 }, { 0x5225, 0x04 },
> +	{ 0x5227, 0x08 }, { 0x5229, 0x0c }, { 0x522b, 0x12 }, { 0x522d, 0x18 },
> +	{ 0x522f, 0x1e }, { 0x5241, 0x04 }, { 0x5242, 0x01 }, { 0x5243, 0x03 },
> +	{ 0x5244, 0x06 }, { 0x5245, 0x0a }, { 0x5246, 0x0e }, { 0x5247, 0x12 },
> +	{ 0x5248, 0x16 }, { 0x524a, 0x03 }, { 0x524c, 0x04 }, { 0x524e, 0x08 },
> +	{ 0x5250, 0x0c }, { 0x5252, 0x12 }, { 0x5254, 0x18 }, { 0x5256, 0x1e },
> +	/* fifo_line_length = 2*hts */
> +	{ 0x4606, (2 * OV10635_HTS) >> 8 }, { 0x4607, (2 * OV10635_HTS) & 0xff },
> +	/* fifo_hsync_start = 2*(hts - xres) */
> +	{ 0x460a, (2 * (OV10635_HTS - OV10635_WIDTH)) >> 8 },
> +	{ 0x460b, (2 * (OV10635_HTS - OV10635_WIDTH)) & 0xff },
> +	{ 0x460c, 0x00 }, { 0x4620, 0x0e },
> +	/* BT601: 0x08 is also acceptable as HS/VS mode */
> +	{ 0x4700, 0x04 }, { 0x4701, 0x00 }, { 0x4702, 0x01 }, { 0x4004, 0x04 },
> +	{ 0x4005, 0x18 }, { 0x4001, 0x06 }, { 0x4050, 0x22 }, { 0x4051, 0x24 },
> +	{ 0x4052, 0x02 }, { 0x4057, 0x9c }, { 0x405a, 0x00 }, { 0x4202, 0x02 },
> +	{ 0x3023, 0x10 }, { 0x0100, 0x01 }, { 0x0100, 0x01 }, { 0x6f10, 0x07 },
> +	{ 0x6f11, 0x82 }, { 0x6f12, 0x04 }, { 0x6f13, 0x00 }, { 0xd000, 0x19 },
> +	{ 0xd001, 0xa0 }, { 0xd002, 0x00 }, { 0xd003, 0x01 }, { 0xd004, 0xa9 },
> +	{ 0xd005, 0xad }, { 0xd006, 0x10 }, { 0xd007, 0x40 }, { 0xd008, 0x44 },
> +	{ 0xd009, 0x00 }, { 0xd00a, 0x68 }, { 0xd00b, 0x00 }, { 0xd00c, 0x15 },
> +	{ 0xd00d, 0x00 }, { 0xd00e, 0x00 }, { 0xd00f, 0x00 }, { 0xd040, 0x9c },
> +	{ 0xd041, 0x21 }, { 0xd042, 0xff }, { 0xd043, 0xf8 }, { 0xd044, 0xd4 },
> +	{ 0xd045, 0x01 }, { 0xd046, 0x48 }, { 0xd047, 0x00 }, { 0xd048, 0xd4 },
> +	{ 0xd049, 0x01 }, { 0xd04a, 0x50 }, { 0xd04b, 0x04 }, { 0xd04c, 0x18 },
> +	{ 0xd04d, 0x60 }, { 0xd04e, 0x00 }, { 0xd04f, 0x01 }, { 0xd050, 0xa8 },
> +	{ 0xd051, 0x63 }, { 0xd052, 0x02 }, { 0xd053, 0xa4 }, { 0xd054, 0x85 },
> +	{ 0xd055, 0x43 }, { 0xd056, 0x00 }, { 0xd057, 0x00 }, { 0xd058, 0x18 },
> +	{ 0xd059, 0x60 }, { 0xd05a, 0x00 }, { 0xd05b, 0x01 }, { 0xd05c, 0xa8 },
> +	{ 0xd05d, 0x63 }, { 0xd05e, 0x03 }, { 0xd05f, 0xf0 }, { 0xd060, 0x98 },
> +	{ 0xd061, 0xa3 }, { 0xd062, 0x00 }, { 0xd063, 0x00 }, { 0xd064, 0x8c },
> +	{ 0xd065, 0x6a }, { 0xd066, 0x00 }, { 0xd067, 0x6e }, { 0xd068, 0xe5 },
> +	{ 0xd069, 0x85 }, { 0xd06a, 0x18 }, { 0xd06b, 0x00 }, { 0xd06c, 0x10 },
> +	{ 0xd06d, 0x00 }, { 0xd06e, 0x00 }, { 0xd06f, 0x10 }, { 0xd070, 0x9c },
> +	{ 0xd071, 0x80 }, { 0xd072, 0x00 }, { 0xd073, 0x03 }, { 0xd074, 0x18 },
> +	{ 0xd075, 0x60 }, { 0xd076, 0x00 }, { 0xd077, 0x01 }, { 0xd078, 0xa8 },
> +	{ 0xd079, 0x63 }, { 0xd07a, 0x07 }, { 0xd07b, 0x80 }, { 0xd07c, 0x07 },
> +	{ 0xd07d, 0xff }, { 0xd07e, 0xf9 }, { 0xd07f, 0x03 }, { 0xd080, 0x8c },
> +	{ 0xd081, 0x63 }, { 0xd082, 0x00 }, { 0xd083, 0x00 }, { 0xd084, 0xa5 },
> +	{ 0xd085, 0x6b }, { 0xd086, 0x00 }, { 0xd087, 0xff }, { 0xd088, 0x18 },
> +	{ 0xd089, 0x80 }, { 0xd08a, 0x00 }, { 0xd08b, 0x01 }, { 0xd08c, 0xa8 },
> +	{ 0xd08d, 0x84 }, { 0xd08e, 0x01 }, { 0xd08f, 0x04 }, { 0xd090, 0xe1 },
> +	{ 0xd091, 0x6b }, { 0xd092, 0x58 }, { 0xd093, 0x00 }, { 0xd094, 0x94 },
> +	{ 0xd095, 0x6a }, { 0xd096, 0x00 }, { 0xd097, 0x70 }, { 0xd098, 0xe1 },
> +	{ 0xd099, 0x6b }, { 0xd09a, 0x20 }, { 0xd09b, 0x00 }, { 0xd09c, 0x95 },
> +	{ 0xd09d, 0x6b }, { 0xd09e, 0x00 }, { 0xd09f, 0x00 }, { 0xd0a0, 0xe4 },
> +	{ 0xd0a1, 0x8b }, { 0xd0a2, 0x18 }, { 0xd0a3, 0x00 }, { 0xd0a4, 0x0c },
> +	{ 0xd0a5, 0x00 }, { 0xd0a6, 0x00 }, { 0xd0a7, 0x23 }, { 0xd0a8, 0x15 },
> +	{ 0xd0a9, 0x00 }, { 0xd0aa, 0x00 }, { 0xd0ab, 0x00 }, { 0xd0ac, 0x18 },
> +	{ 0xd0ad, 0x60 }, { 0xd0ae, 0x80 }, { 0xd0af, 0x06 }, { 0xd0b0, 0xa8 },
> +	{ 0xd0b1, 0x83 }, { 0xd0b2, 0x40 }, { 0xd0b3, 0x08 }, { 0xd0b4, 0xa8 },
> +	{ 0xd0b5, 0xe3 }, { 0xd0b6, 0x38 }, { 0xd0b7, 0x2a }, { 0xd0b8, 0xa8 },
> +	{ 0xd0b9, 0xc3 }, { 0xd0ba, 0x40 }, { 0xd0bb, 0x09 }, { 0xd0bc, 0xa8 },
> +	{ 0xd0bd, 0xa3 }, { 0xd0be, 0x38 }, { 0xd0bf, 0x29 }, { 0xd0c0, 0x8c },
> +	{ 0xd0c1, 0x65 }, { 0xd0c2, 0x00 }, { 0xd0c3, 0x00 }, { 0xd0c4, 0xd8 },
> +	{ 0xd0c5, 0x04 }, { 0xd0c6, 0x18 }, { 0xd0c7, 0x00 }, { 0xd0c8, 0x8c },
> +	{ 0xd0c9, 0x67 }, { 0xd0ca, 0x00 }, { 0xd0cb, 0x00 }, { 0xd0cc, 0xd8 },
> +	{ 0xd0cd, 0x06 }, { 0xd0ce, 0x18 }, { 0xd0cf, 0x00 }, { 0xd0d0, 0x18 },
> +	{ 0xd0d1, 0x60 }, { 0xd0d2, 0x80 }, { 0xd0d3, 0x06 }, { 0xd0d4, 0xa8 },
> +	{ 0xd0d5, 0xe3 }, { 0xd0d6, 0x67 }, { 0xd0d7, 0x02 }, { 0xd0d8, 0xa9 },
> +	{ 0xd0d9, 0x03 }, { 0xd0da, 0x67 }, { 0xd0db, 0x03 }, { 0xd0dc, 0xa8 },
> +	{ 0xd0dd, 0xc3 }, { 0xd0de, 0x3d }, { 0xd0df, 0x05 }, { 0xd0e0, 0x8c },
> +	{ 0xd0e1, 0x66 }, { 0xd0e2, 0x00 }, { 0xd0e3, 0x00 }, { 0xd0e4, 0xb8 },
> +	{ 0xd0e5, 0x63 }, { 0xd0e6, 0x00 }, { 0xd0e7, 0x18 }, { 0xd0e8, 0xb8 },
> +	{ 0xd0e9, 0x63 }, { 0xd0ea, 0x00 }, { 0xd0eb, 0x98 }, { 0xd0ec, 0xbc },
> +	{ 0xd0ed, 0x03 }, { 0xd0ee, 0x00 }, { 0xd0ef, 0x00 }, { 0xd0f0, 0x10 },
> +	{ 0xd0f1, 0x00 }, { 0xd0f2, 0x00 }, { 0xd0f3, 0x16 }, { 0xd0f4, 0xb8 },
> +	{ 0xd0f5, 0x83 }, { 0xd0f6, 0x00 }, { 0xd0f7, 0x19 }, { 0xd0f8, 0x8c },
> +	{ 0xd0f9, 0x67 }, { 0xd0fa, 0x00 }, { 0xd0fb, 0x00 }, { 0xd0fc, 0xb8 },
> +	{ 0xd0fd, 0xa4 }, { 0xd0fe, 0x00 }, { 0xd0ff, 0x98 }, { 0xd100, 0xb8 },
> +	{ 0xd101, 0x83 }, { 0xd102, 0x00 }, { 0xd103, 0x08 }, { 0xd104, 0x8c },
> +	{ 0xd105, 0x68 }, { 0xd106, 0x00 }, { 0xd107, 0x00 }, { 0xd108, 0xe0 },
> +	{ 0xd109, 0x63 }, { 0xd10a, 0x20 }, { 0xd10b, 0x04 }, { 0xd10c, 0xe0 },
> +	{ 0xd10d, 0x65 }, { 0xd10e, 0x18 }, { 0xd10f, 0x00 }, { 0xd110, 0xa4 },
> +	{ 0xd111, 0x83 }, { 0xd112, 0xff }, { 0xd113, 0xff }, { 0xd114, 0xb8 },
> +	{ 0xd115, 0x64 }, { 0xd116, 0x00 }, { 0xd117, 0x48 }, { 0xd118, 0xd8 },
> +	{ 0xd119, 0x07 }, { 0xd11a, 0x18 }, { 0xd11b, 0x00 }, { 0xd11c, 0xd8 },
> +	{ 0xd11d, 0x08 }, { 0xd11e, 0x20 }, { 0xd11f, 0x00 }, { 0xd120, 0x9c },
> +	{ 0xd121, 0x60 }, { 0xd122, 0x00 }, { 0xd123, 0x00 }, { 0xd124, 0xd8 },
> +	{ 0xd125, 0x06 }, { 0xd126, 0x18 }, { 0xd127, 0x00 }, { 0xd128, 0x00 },
> +	{ 0xd129, 0x00 }, { 0xd12a, 0x00 }, { 0xd12b, 0x08 }, { 0xd12c, 0x15 },
> +	{ 0xd12d, 0x00 }, { 0xd12e, 0x00 }, { 0xd12f, 0x00 }, { 0xd130, 0x8c },
> +	{ 0xd131, 0x6a }, { 0xd132, 0x00 }, { 0xd133, 0x76 }, { 0xd134, 0xbc },
> +	{ 0xd135, 0x23 }, { 0xd136, 0x00 }, { 0xd137, 0x00 }, { 0xd138, 0x13 },
> +	{ 0xd139, 0xff }, { 0xd13a, 0xff }, { 0xd13b, 0xe6 }, { 0xd13c, 0x18 },
> +	{ 0xd13d, 0x60 }, { 0xd13e, 0x80 }, { 0xd13f, 0x06 }, { 0xd140, 0x03 },
> +	{ 0xd141, 0xff }, { 0xd142, 0xff }, { 0xd143, 0xdd }, { 0xd144, 0xa8 },
> +	{ 0xd145, 0x83 }, { 0xd146, 0x40 }, { 0xd147, 0x08 }, { 0xd148, 0x85 },
> +	{ 0xd149, 0x21 }, { 0xd14a, 0x00 }, { 0xd14b, 0x00 }, { 0xd14c, 0x85 },
> +	{ 0xd14d, 0x41 }, { 0xd14e, 0x00 }, { 0xd14f, 0x04 }, { 0xd150, 0x44 },
> +	{ 0xd151, 0x00 }, { 0xd152, 0x48 }, { 0xd153, 0x00 }, { 0xd154, 0x9c },
> +	{ 0xd155, 0x21 }, { 0xd156, 0x00 }, { 0xd157, 0x08 }, { 0x6f0e, 0x03 },
> +	{ 0x6f0f, 0x00 }, { 0x460e, 0x08 }, { 0x460f, 0x01 }, { 0x4610, 0x00 },
> +	{ 0x4611, 0x01 }, { 0x4612, 0x00 }, { 0x4613, 0x01 },
> +	/* 8 bits */
> +	{ 0x4605, 0x08 },
> +	/* Swap data bits order [9:0] -> [0:9] */
> +	{ 0x4709, 0x10 }, { 0x4608, 0x00 }, { 0x4609, 0x08 }, { 0x6804, 0x00 },
> +	{ 0x6805, 0x06 }, { 0x6806, 0x00 }, { 0x5120, 0x00 }, { 0x3510, 0x00 },
> +	{ 0x3504, 0x00 }, { 0x6800, 0x00 }, { 0x6f0d, 0x01 },
> +	/* PCLK falling edge */
> +	{ 0x4708, 0x01 }, { 0x5000, 0xff }, { 0x5001, 0xbf }, { 0x5002, 0x7e },
> +	{ 0x503d, 0x00 }, { 0xc450, 0x01 }, { 0xc452, 0x04 }, { 0xc453, 0x00 },
> +	{ 0xc454, 0x00 }, { 0xc455, 0x01 }, { 0xc456, 0x01 }, { 0xc457, 0x00 },
> +	{ 0xc458, 0x00 }, { 0xc459, 0x00 }, { 0xc45b, 0x00 }, { 0xc45c, 0x01 },
> +	{ 0xc45d, 0x00 }, { 0xc45e, 0x00 }, { 0xc45f, 0x00 }, { 0xc460, 0x00 },
> +	{ 0xc461, 0x01 }, { 0xc462, 0x01 }, { 0xc464, 0x03 }, { 0xc465, 0x00 },
> +	{ 0xc466, 0x8a }, { 0xc467, 0x00 }, { 0xc468, 0x86 }, { 0xc469, 0x00 },
> +	{ 0xc46a, 0x40 }, { 0xc46b, 0x50 }, { 0xc46c, 0x30 }, { 0xc46d, 0x28 },
> +	{ 0xc46e, 0x60 }, { 0xc46f, 0x40 }, { 0xc47c, 0x01 }, { 0xc47d, 0x38 },
> +	{ 0xc47e, 0x00 }, { 0xc47f, 0x00 }, { 0xc480, 0x00 }, { 0xc481, 0xff },
> +	{ 0xc482, 0x00 }, { 0xc483, 0x40 }, { 0xc484, 0x00 }, { 0xc485, 0x18 },
> +	{ 0xc486, 0x00 }, { 0xc487, 0x18 },
> +	{ 0xc488, (OV10635_VTS - 8) * 16 >> 8},
> +	{ 0xc489, (OV10635_VTS - 8) * 16 & 0xff},
> +	{ 0xc48a, (OV10635_VTS - 8) * 16 >> 8},
> +	{ 0xc48b, (OV10635_VTS - 8) * 16 & 0xff}, { 0xc48c, 0x00 },
> +	{ 0xc48d, 0x04 }, { 0xc48e, 0x00 }, { 0xc48f, 0x04 }, { 0xc490, 0x03 },
> +	{ 0xc492, 0x20 }, { 0xc493, 0x08 }, { 0xc498, 0x02 }, { 0xc499, 0x00 },
> +	{ 0xc49a, 0x02 }, { 0xc49b, 0x00 }, { 0xc49c, 0x02 }, { 0xc49d, 0x00 },
> +	{ 0xc49e, 0x02 }, { 0xc49f, 0x60 }, { 0xc4a0, 0x03 }, { 0xc4a1, 0x00 },
> +	{ 0xc4a2, 0x04 }, { 0xc4a3, 0x00 }, { 0xc4a4, 0x00 }, { 0xc4a5, 0x10 },
> +	{ 0xc4a6, 0x00 }, { 0xc4a7, 0x40 }, { 0xc4a8, 0x00 }, { 0xc4a9, 0x80 },
> +	{ 0xc4aa, 0x0d }, { 0xc4ab, 0x00 }, { 0xc4ac, 0x0f }, { 0xc4ad, 0xc0 },
> +	{ 0xc4b4, 0x01 }, { 0xc4b5, 0x01 }, { 0xc4b6, 0x00 }, { 0xc4b7, 0x01 },
> +	{ 0xc4b8, 0x00 }, { 0xc4b9, 0x01 }, { 0xc4ba, 0x01 }, { 0xc4bb, 0x00 },
> +	{ 0xc4bc, 0x01 }, { 0xc4bd, 0x60 }, { 0xc4be, 0x02 }, { 0xc4bf, 0x33 },
> +	{ 0xc4c8, 0x03 }, { 0xc4c9, 0xd0 }, { 0xc4ca, 0x0e }, { 0xc4cb, 0x00 },
> +	{ 0xc4cc, 0x0e }, { 0xc4cd, 0x51 }, { 0xc4ce, 0x0e }, { 0xc4cf, 0x51 },
> +	{ 0xc4d0, 0x04 }, { 0xc4d1, 0x80 }, { 0xc4e0, 0x04 }, { 0xc4e1, 0x02 },
> +	{ 0xc4e2, 0x01 }, { 0xc4e4, 0x10 }, { 0xc4e5, 0x20 }, { 0xc4e6, 0x30 },
> +	{ 0xc4e7, 0x40 }, { 0xc4e8, 0x50 }, { 0xc4e9, 0x60 }, { 0xc4ea, 0x70 },
> +	{ 0xc4eb, 0x80 }, { 0xc4ec, 0x90 }, { 0xc4ed, 0xa0 }, { 0xc4ee, 0xb0 },
> +	{ 0xc4ef, 0xc0 }, { 0xc4f0, 0xd0 }, { 0xc4f1, 0xe0 }, { 0xc4f2, 0xf0 },
> +	{ 0xc4f3, 0x80 }, { 0xc4f4, 0x00 }, { 0xc4f5, 0x20 }, { 0xc4f6, 0x02 },
> +	{ 0xc4f7, 0x00 }, { 0xc4f8, 0x00 }, { 0xc4f9, 0x00 }, { 0xc4fa, 0x00 },
> +	{ 0xc4fb, 0x01 }, { 0xc4fc, 0x01 }, { 0xc4fd, 0x00 }, { 0xc4fe, 0x04 },
> +	{ 0xc4ff, 0x02 }, { 0xc500, 0x48 }, { 0xc501, 0x74 }, { 0xc502, 0x58 },
> +	{ 0xc503, 0x80 }, { 0xc504, 0x05 }, { 0xc505, 0x80 }, { 0xc506, 0x03 },
> +	{ 0xc507, 0x80 }, { 0xc508, 0x01 }, { 0xc509, 0xc0 }, { 0xc50a, 0x01 },
> +	{ 0xc50b, 0xa0 }, { 0xc50c, 0x01 }, { 0xc50d, 0x2c }, { 0xc50e, 0x01 },
> +	{ 0xc50f, 0x0a }, { 0xc510, 0x00 }, { 0xc511, 0x00 }, { 0xc512, 0xe5 },
> +	{ 0xc513, 0x14 }, { 0xc514, 0x04 }, { 0xc515, 0x00 }, { 0xc518, OV10635_VTS >> 8},
> +	{ 0xc519, OV10635_VTS & 0xff}, { 0xc51a, OV10635_HTS >> 8},
> +	{ 0xc51b, OV10635_HTS & 0xff}, { 0xc2e0, 0x00 }, { 0xc2e1, 0x51 },
> +	{ 0xc2e2, 0x00 }, { 0xc2e3, 0xd6 }, { 0xc2e4, 0x01 }, { 0xc2e5, 0x5e },
> +	{ 0xc2e9, 0x01 }, { 0xc2ea, 0x7a }, { 0xc2eb, 0x90 }, { 0xc2ed, 0x00 },
> +	{ 0xc2ee, 0x7a }, { 0xc2ef, 0x64 }, { 0xc308, 0x00 }, { 0xc309, 0x00 },
> +	{ 0xc30a, 0x00 }, { 0xc30c, 0x00 }, { 0xc30d, 0x01 }, { 0xc30e, 0x00 },
> +	{ 0xc30f, 0x00 }, { 0xc310, 0x01 }, { 0xc311, 0x60 }, { 0xc312, 0xff },
> +	{ 0xc313, 0x08 }, { 0xc314, 0x01 }, { 0xc315, 0x00 }, { 0xc316, 0xff },
> +	{ 0xc317, 0x0b }, { 0xc318, 0x00 }, { 0xc319, 0x0c }, { 0xc31a, 0x00 },
> +	{ 0xc31b, 0xe0 }, { 0xc31c, 0x00 }, { 0xc31d, 0x14 }, { 0xc31e, 0x00 },
> +	{ 0xc31f, 0xc5 }, { 0xc320, 0xff }, { 0xc321, 0x4b }, { 0xc322, 0xff },
> +	{ 0xc323, 0xf0 }, { 0xc324, 0xff }, { 0xc325, 0xe8 }, { 0xc326, 0x00 },
> +	{ 0xc327, 0x46 }, { 0xc328, 0xff }, { 0xc329, 0xd2 }, { 0xc32a, 0xff },
> +	{ 0xc32b, 0xe4 }, { 0xc32c, 0xff }, { 0xc32d, 0xbb }, { 0xc32e, 0x00 },
> +	{ 0xc32f, 0x61 }, { 0xc330, 0xff }, { 0xc331, 0xf9 }, { 0xc332, 0x00 },
> +	{ 0xc333, 0xd9 }, { 0xc334, 0x00 }, { 0xc335, 0x2e }, { 0xc336, 0x00 },
> +	{ 0xc337, 0xb1 }, { 0xc338, 0xff }, { 0xc339, 0x64 }, { 0xc33a, 0xff },
> +	{ 0xc33b, 0xeb }, { 0xc33c, 0xff }, { 0xc33d, 0xe8 }, { 0xc33e, 0x00 },
> +	{ 0xc33f, 0x48 }, { 0xc340, 0xff }, { 0xc341, 0xd0 }, { 0xc342, 0xff },
> +	{ 0xc343, 0xed }, { 0xc344, 0xff }, { 0xc345, 0xad }, { 0xc346, 0x00 },
> +	{ 0xc347, 0x66 }, { 0xc348, 0x01 }, { 0xc349, 0x00 }, { 0x6700, 0x04 },
> +	{ 0x6701, 0x7b }, { 0x6702, 0xfd }, { 0x6703, 0xf9 }, { 0x6704, 0x3d },
> +	{ 0x6705, 0x71 }, { 0x6706, 0x78 }, { 0x6708, 0x05 }, { 0x6f06, 0x6f },
> +	{ 0x6f07, 0x00 }, { 0x6f0a, 0x6f }, { 0x6f0b, 0x00 }, { 0x6f00, 0x03 },
> +	{ 0xc34c, 0x01 }, { 0xc34d, 0x00 }, { 0xc34e, 0x46 }, { 0xc34f, 0x55 },
> +	{ 0xc350, 0x00 }, { 0xc351, 0x40 }, { 0xc352, 0x00 }, { 0xc353, 0xff },
> +	{ 0xc354, 0x04 }, { 0xc355, 0x08 }, { 0xc356, 0x01 }, { 0xc357, 0xef },
> +	{ 0xc358, 0x30 }, { 0xc359, 0x01 }, { 0xc35a, 0x64 }, { 0xc35b, 0x46 },
> +	{ 0xc35c, 0x00 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
> +	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
> +	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
> +	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
> +	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
> +	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 },
> +	{ 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0x3042, 0xf0 }, { 0xc261, 0x01 },
> +	{ 0x301b, 0xf0 }, { 0x301c, 0xf0 }, { 0x301a, 0xf0 }, { 0x6f00, 0xc3 },
> +	{ 0xc46a, 0x30 }, { 0xc46d, 0x20 }, { 0xc464, 0x84 }, { 0xc465, 0x00 },
> +	{ 0x6f00, 0x03 }, { 0x6f00, 0x43 }, { 0x381c, 0x00 }, { 0x381d, 0x40 },
> +	{ 0xc454, 0x01 }, { 0x6f00, 0xc3 }, { 0xc454, 0x00 }, { 0xc4b1, 0x02 },
> +	{ 0xc4b2, 0x01 }, { 0xc4b3, 0x03 }, { 0x6f00, 0x03 }, { 0x6f00, 0x43 },
> +	/* enable FSIN (FRAMESYNC input) functionality */
> +	{ 0x3832, (0x0d + 2 * 0x20 + 0x15 + 38) >> 8 },
> +	{ 0x3833, (0x0d + 2 * 0x20 + 0x15 + 38) & 0xff },
> +	{ 0x3834, OV10635_VTS >> 8 }, { 0x3835, OV10635_VTS & 0xff },
> +	{ 0x302e, 0x01 },
> +};
> +
> +struct rdacm20_device {
> +	struct device			*dev;
> +	struct max9271_device		*serializer;
> +	struct i2c_client		*sensor;
> +	struct v4l2_subdev		sd;
> +	struct media_pad		pad;
> +	struct v4l2_ctrl_handler	ctrls;
> +	u32				addrs[2];
> +};
> +
> +static inline struct rdacm20_device *sd_to_rdacm20(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct rdacm20_device, sd);
> +}
> +
> +static inline struct rdacm20_device *i2c_to_rdacm20(struct i2c_client *client)
> +{
> +	return sd_to_rdacm20(i2c_get_clientdata(client));
> +}
> +
> +static int ov10635_read16(struct rdacm20_device *dev, u16 reg)
> +{
> +	u8 buf[2] = { reg >> 8, reg & 0xff };
> +	int ret;
> +
> +	ret = i2c_master_send(dev->sensor, buf, 2);
> +	if (ret != 2) {
> +		dev_dbg(dev->dev, "%s: register 0x%04x write failed (%d)\n",
> +			__func__, reg, ret);
> +		return ret;
> +	}
> +
> +	ret = i2c_master_recv(dev->sensor, buf, 2);
> +	if (ret < 0) {
> +		dev_dbg(dev->dev, "%s: register 0x%04x read failed (%d)\n",
> +			__func__, reg, ret);
> +		return ret;
> +	}
> +
> +	return (buf[0] << 8) | buf[1];
> +}
> +
> +static int __ov10635_write(struct rdacm20_device *dev, u16 reg, u8 val)
> +{
> +	u8 buf[3] = { reg >> 8, reg & 0xff, val };
> +	int ret;
> +
> +	dev_dbg(dev->dev, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
> +
> +	ret = i2c_master_send(dev->sensor, buf, 3);
> +	return ret < 0 ? ret : 0;
> +}
> +
> +static int ov10635_write(struct rdacm20_device *dev, u16 reg, u8 val)
> +{
> +	int ret;
> +
> +	ret = __ov10635_write(dev, reg, val);
> +	if (ret < 0)
> +		dev_err(dev->dev, "%s: register 0x%04x write failed (%d)\n",
> +			__func__, reg, ret);
> +
> +	return ret;
> +}
> +
> +static int ov10635_set_regs(struct rdacm20_device *dev,
> +			    const struct ov10635_reg *regs,
> +			    unsigned int nr_regs)
> +{
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < nr_regs; i++) {
> +		ret = __ov10635_write(dev, regs[i].reg, regs[i].val);
> +		if (ret) {
> +			dev_err(dev->dev,
> +				"%s: register %u (0x%04x) write failed (%d)\n",
> +				__func__, i, regs[i].reg, ret);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int rdacm20_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> +	struct rdacm20_device *dev = sd_to_rdacm20(sd);
> +
> +	return max9271_set_serial_link(dev->serializer, enable);
> +}
> +
> +static int rdacm20_enum_mbus_code(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->pad || code->index > 0)
> +		return -EINVAL;
> +
> +	code->code = OV10635_FORMAT;
> +
> +	return 0;
> +}
> +
> +static int rdacm20_get_fmt(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_format *format)
> +{
> +	struct v4l2_mbus_framefmt *mf = &format->format;
> +
> +	if (format->pad)
> +		return -EINVAL;
> +
> +	mf->width		= OV10635_WIDTH;
> +	mf->height		= OV10635_HEIGHT;
> +	mf->code		= OV10635_FORMAT;
> +	mf->colorspace		= V4L2_COLORSPACE_RAW;
> +	mf->field		= V4L2_FIELD_NONE;
> +	mf->ycbcr_enc		= V4L2_YCBCR_ENC_601;
> +	mf->quantization	= V4L2_QUANTIZATION_FULL_RANGE;
> +	mf->xfer_func		= V4L2_XFER_FUNC_NONE;
> +
> +	return 0;
> +}
> +
> +static struct v4l2_subdev_video_ops rdacm20_video_ops = {
> +	.s_stream	= rdacm20_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops rdacm20_subdev_pad_ops = {
> +	.enum_mbus_code = rdacm20_enum_mbus_code,
> +	.get_fmt	= rdacm20_get_fmt,
> +	.set_fmt	= rdacm20_get_fmt,
> +};
> +
> +static struct v4l2_subdev_ops rdacm20_subdev_ops = {
> +	.video		= &rdacm20_video_ops,
> +	.pad		= &rdacm20_subdev_pad_ops,
> +};
> +
> +static int rdacm20_initialize(struct rdacm20_device *dev)
> +{
> +	unsigned int retry = 3;
> +	int ret;
> +
> +	/* Verify communication with the MAX9271: ping to wakeup. */
> +	dev->serializer->client->addr = MAX9271_DEFAULT_ADDR;
> +	i2c_smbus_read_byte(dev->serializer->client);
> +
> +	/* Serial link disabled during config as it needs a valid pixel clock. */
> +	ret = max9271_set_serial_link(dev->serializer, false);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 *  Ensure that we have a good link configuration before attempting to
> +	 *  identify the device.
> +	 */
> +	max9271_configure_i2c(dev->serializer, MAX9271_I2CSLVSH_469NS_234NS |
> +					       MAX9271_I2CSLVTO_1024US |
> +					       MAX9271_I2CMSTBT_105KBPS);
> +
> +	max9271_configure_gmsl_link(dev->serializer);
> +
> +	ret = max9271_verify_id(dev->serializer);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = max9271_set_address(dev->serializer, dev->addrs[0]);
> +	if (ret < 0)
> +		return ret;
> +	dev->serializer->client->addr = dev->addrs[0];
> +
> +	/*
> +	 * Reset the sensor by cycling the OV10635 reset signal connected to the
> +	 * MAX9271 GPIO1 and verify communication with the OV10635.
> +	 */
> +	max9271_clear_gpios(dev->serializer, MAX9271_GPIO1OUT);
> +	mdelay(10);
> +	max9271_set_gpios(dev->serializer, MAX9271_GPIO1OUT);
> +	mdelay(10);
> +
> +again:
> +	ret = ov10635_read16(dev, OV10635_PID);
> +	if (ret < 0) {
> +		if (retry--)
> +			goto again;
> +
> +		dev_err(dev->dev, "OV10635 ID read failed (%d)\n",
> +			ret);
> +		return -ENXIO;
> +	}
> +
> +	if (ret != OV10635_VERSION) {
> +		if (retry--)
> +			goto again;
> +
> +		dev_err(dev->dev, "OV10635 ID mismatch (0x%04x)\n",
> +			ret);
> +		return -ENXIO;
> +	}
> +
> +	/* Change the sensor I2C address. */
> +	ret = ov10635_write(dev, OV10635_SC_CMMN_SCCB_ID,
> +			    (dev->addrs[1] << 1) |
> +			    OV10635_SC_CMMN_SCCB_ID_SELECT);
> +	if (ret < 0) {
> +		dev_err(dev->dev,
> +			"OV10635 I2C address change failed (%d)\n", ret);
> +		return ret;
> +	}
> +	dev->sensor->addr = dev->addrs[1];
> +	usleep_range(3500, 5000);
> +
> +	/* Program the 0V10635 initial configuration. */
> +	ret = ov10635_set_regs(dev, ov10635_regs_wizard,
> +			       ARRAY_SIZE(ov10635_regs_wizard));
> +	if (ret)
> +		return ret;
> +
> +	dev_info(dev->dev, "Identified MAX9271 + OV10635 device\n");
> +
> +	return 0;
> +}
> +
> +static int rdacm20_probe(struct i2c_client *client)
> +{
> +	struct rdacm20_device *dev;
> +	struct fwnode_handle *ep;
> +	int ret;
> +
> +	dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +	dev->dev = &client->dev;
> +
> +	dev->serializer = devm_kzalloc(&client->dev, sizeof(*dev->serializer),
> +				       GFP_KERNEL);
> +	if (!dev->serializer)
> +		return -ENOMEM;
> +
> +	dev->serializer->client = client;
> +
> +	ret = of_property_read_u32_array(client->dev.of_node, "reg",
> +					 dev->addrs, 2);
> +	if (ret < 0) {
> +		dev_err(dev->dev, "Invalid DT reg property: %d\n", ret);
> +		return -EINVAL;
> +	}
> +
> +	/* Create the dummy I2C client for the sensor. */
> +	dev->sensor = i2c_new_dummy_device(client->adapter,
> +					   OV10635_I2C_ADDRESS);
> +	if (IS_ERR(dev->sensor)) {
> +		ret = PTR_ERR(dev->sensor);
> +		goto error;
> +	}
> +
> +	/* Initialize the hardware. */
> +	ret = rdacm20_initialize(dev);
> +	if (ret < 0)
> +		goto error;
> +
> +	/* Initialize and register the subdevice. */
> +	v4l2_i2c_subdev_init(&dev->sd, client, &rdacm20_subdev_ops);
> +	dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +
> +	v4l2_ctrl_handler_init(&dev->ctrls, 1);
> +	v4l2_ctrl_new_std(&dev->ctrls, NULL, V4L2_CID_PIXEL_RATE,
> +			  OV10635_PIXEL_RATE, OV10635_PIXEL_RATE, 1,
> +			  OV10635_PIXEL_RATE);
> +	dev->sd.ctrl_handler = &dev->ctrls;
> +
> +	ret = dev->ctrls.error;
> +	if (ret)
> +		goto error_free_ctrls;
> +
> +	dev->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	dev->sd.entity.flags |= MEDIA_ENT_F_CAM_SENSOR;
> +	ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
> +	if (ret < 0)
> +		goto error_free_ctrls;
> +
> +	ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev), NULL);
> +	if (!ep) {
> +		dev_err(&client->dev,
> +			"Unable to get endpoint in node %pOF\n",
> +			client->dev.of_node);
> +		ret = -ENOENT;
> +		goto error_free_ctrls;
> +	}
> +	dev->sd.fwnode = ep;
> +
> +	ret = v4l2_async_register_subdev(&dev->sd);
> +	if (ret)
> +		goto error_put_node;
> +
> +	return 0;
> +
> +error_put_node:
> +	fwnode_handle_put(ep);
> +error_free_ctrls:
> +	v4l2_ctrl_handler_free(&dev->ctrls);
> +error:
> +	media_entity_cleanup(&dev->sd.entity);
> +	if (dev->sensor)
> +		i2c_unregister_device(dev->sensor);
> +
> +	dev_err(&client->dev, "probe failed\n");
> +
> +	return ret;
> +}
> +
> +static int rdacm20_remove(struct i2c_client *client)
> +{
> +	struct rdacm20_device *dev = i2c_to_rdacm20(client);
> +
> +	fwnode_handle_put(dev->sd.fwnode);
> +	v4l2_async_unregister_subdev(&dev->sd);
> +	v4l2_ctrl_handler_free(&dev->ctrls);
> +	media_entity_cleanup(&dev->sd.entity);
> +	i2c_unregister_device(dev->sensor);
> +
> +	return 0;
> +}
> +
> +static void rdacm20_shutdown(struct i2c_client *client)
> +{
> +	struct rdacm20_device *dev = i2c_to_rdacm20(client);
> +
> +	/* make sure stream off during shutdown (reset/reboot) */
> +	rdacm20_s_stream(&dev->sd, 0);
> +}
> +
> +static const struct of_device_id rdacm20_of_ids[] = {
> +	{ .compatible = "imi,rdacm20", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, rdacm20_of_ids);
> +
> +static struct i2c_driver rdacm20_i2c_driver = {
> +	.driver	= {
> +		.name	= "rdacm20",
> +		.of_match_table = rdacm20_of_ids,
> +	},
> +	.probe_new	= rdacm20_probe,
> +	.remove		= rdacm20_remove,
> +	.shutdown	= rdacm20_shutdown,
> +};
> +
> +module_i2c_driver(rdacm20_i2c_driver);
> +
> +MODULE_DESCRIPTION("GMSL Camera driver for RDACM20");
> +MODULE_AUTHOR("Vladimir Barinov");
> +MODULE_LICENSE("GPL");
> --
> 2.26.0
>

Re: [v8-rc1 15/20] squash! max9286: Disable overlap window

[Jacopo Mondi]

Hi Kieran,

On Thu, Apr 16, 2020 at 11:50:07AM +0100, Kieran Bingham wrote:
> Hi Jacopo,
>
> On 16/04/2020 11:40, Jacopo Mondi wrote:
> > From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> >
> > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> >
> > ---
> > v2:
> >   [Jacopo]
> >   - Write register 0x63 and 0x64 directly as going through the function
> >     breaks RDACM21 operations
> > ---
> >  drivers/media/i2c/max9286.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
> > index 3ef74ba10074..e0c637d4a7de 100644
> > --- a/drivers/media/i2c/max9286.c
> > +++ b/drivers/media/i2c/max9286.c
> > @@ -966,6 +966,18 @@ static int max9286_setup(struct max9286_priv *priv)
> >  	max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
> >  		      MAX9286_HVSRC_D14);
> >
> > +	/*
> > +	 * The overlap window seems to provide additional validation by tracking
> > +	 * the delay between vsync and frame sync, generating an error if the
> > +	 * delay is bigger than the programmed window, though it's not yet clear
> > +	 * what value should be set.
> > +	 *
> > +	 * As it's an optional value and can be disabled, we do so by setting
> > +	 * a 0 overlap value.
>
> Are you happy to add the following as part of the removal of the function?
>
> 	 *
> 	 * The overlap window is a 13 bit value, and register 0x64 is
> 	 * shared with ENFSINLAST in BIT(5) which is also set zero.
> 	 *

Not sure, as I noticed failres for RDACM21 when not writing the
supposidely reserved bits.

As we blindly write the full registers I would leave details out until
we figure out what's happening.

>
> > +	 */
> > +	max9286_write(priv, 0x63, 0);
> > +	max9286_write(priv, 0x64, 0);
> > +
> >  	/*
> >  	 * Wait for 2ms to allow the link to resynchronize after the
> >  	 * configuration change.
> >
>

Re: [v8-rc1 15/20] squash! max9286: Disable overlap window

[Kieran Bingham]

On 16/04/2020 12:31, Jacopo Mondi wrote:
> Hi Kieran,
> 
> On Thu, Apr 16, 2020 at 11:50:07AM +0100, Kieran Bingham wrote:
>> Hi Jacopo,
>>
>> On 16/04/2020 11:40, Jacopo Mondi wrote:
>>> From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
>>>
>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
>>>
>>> ---
>>> v2:
>>>   [Jacopo]
>>>   - Write register 0x63 and 0x64 directly as going through the function
>>>     breaks RDACM21 operations
>>> ---
>>>  drivers/media/i2c/max9286.c | 12 ++++++++++++
>>>  1 file changed, 12 insertions(+)
>>>
>>> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
>>> index 3ef74ba10074..e0c637d4a7de 100644
>>> --- a/drivers/media/i2c/max9286.c
>>> +++ b/drivers/media/i2c/max9286.c
>>> @@ -966,6 +966,18 @@ static int max9286_setup(struct max9286_priv *priv)
>>>  	max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
>>>  		      MAX9286_HVSRC_D14);
>>>
>>> +	/*
>>> +	 * The overlap window seems to provide additional validation by tracking
>>> +	 * the delay between vsync and frame sync, generating an error if the
>>> +	 * delay is bigger than the programmed window, though it's not yet clear
>>> +	 * what value should be set.
>>> +	 *
>>> +	 * As it's an optional value and can be disabled, we do so by setting
>>> +	 * a 0 overlap value.
>>
>> Are you happy to add the following as part of the removal of the function?
>>
>> 	 *
>> 	 * The overlap window is a 13 bit value, and register 0x64 is
>> 	 * shared with ENFSINLAST in BIT(5) which is also set zero.
>> 	 *
> 
> Not sure, as I noticed failres for RDACM21 when not writing the
> supposidely reserved bits.
> 
> As we blindly write the full registers I would leave details out until
> we figure out what's happening.

But that's precisely why I think we should document it :-) Otherwise -
some other person could hit this issue in a different way...

> 
>>
>>> +	 */
>>> +	max9286_write(priv, 0x63, 0);
>>> +	max9286_write(priv, 0x64, 0);
>>> +
>>>  	/*
>>>  	 * Wait for 2ms to allow the link to resynchronize after the
>>>  	 * configuration change.
>>>
>>

Re: [v8-rc1 14/20] squash! max9286: Calculate pixel rate

[Jacopo Mondi]

Hi Kieran,

On Thu, Apr 16, 2020 at 11:45:27AM +0100, Kieran Bingham wrote:
> Hi Jacopo,
>
> There we go - looks like a viable solution to me.
>
> I wonder/suspect if this is the issue the BSP team were having some
> weeks ago too?

Could be. Let's revive the thread once we get this sent to linux-media

>
> Anyway, I'm certainly happy with this.
>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
>
>
> On 16/04/2020 11:40, Jacopo Mondi wrote:
> > Calculate the CSI-2 transmitter pixel rate using the one reported from
> > sources.
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> > ---
> >  drivers/media/i2c/max9286.c | 50 +++++++++++++++++++++++++++++--------
> >  1 file changed, 40 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
> > index 2d71205a1aad..3ef74ba10074 100644
> > --- a/drivers/media/i2c/max9286.c
> > +++ b/drivers/media/i2c/max9286.c
> > @@ -430,9 +430,46 @@ static int max9286_check_config_link(struct max9286_priv *priv,
> >   * V4L2 Subdev
> >   */
> >
> > -static int max9286_set_pixelrate(struct max9286_priv *priv, s64 rate)
> > +static int max9286_set_pixelrate(struct max9286_priv *priv)
> >  {
> > -	return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, rate);
> > +	struct max9286_source *source = NULL;
> > +	u64 pixelrate = 0;
> > +
> > +	for_each_source(priv, source) {
> > +		struct v4l2_ctrl *ctrl;
> > +		u64 source_rate = 0;
> > +
> > +		/* Pixel rate is mandatory to be reported by sources. */
> > +		ctrl = v4l2_ctrl_find(source->sd->ctrl_handler,
> > +				      V4L2_CID_PIXEL_RATE);
> > +		if (!ctrl) {
> > +			pixelrate = 0;
> > +			break;
> > +		}
> > +
> > +		/* All source must report the same pixel rate. */
> > +		source_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
> > +		if (!pixelrate) {
> > +			pixelrate = source_rate;
> > +		} else if (pixelrate != source_rate) {
> > +			dev_err(&priv->client->dev,
> > +				"Unable to calculate pixel rate\n");
>
> Hrm ... I would report "Source pixel rates are different\n"
>  ... but I don't think that's a big deal.

That's fine, as you wish :)

>
>
> > +			return -EINVAL;
> > +		}
> > +	}
> > +
> > +	if (!pixelrate) {
> > +		dev_err(&priv->client->dev,
> > +			"No pixel rate control available in sources\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	/*
> > +	 * The CSI-2 transmitter pixel rate is the single source rate multiplied
> > +	 * by the number of available sources.
> > +	 */
> > +	return v4l2_ctrl_s_ctrl_int64(priv->pixelrate,
> > +				      pixelrate * priv->nsources);
> >  }
> >
> >  static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
> > @@ -496,7 +533,7 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
> >  	 */
> >  	max9286_configure_i2c(priv, false);
> >
> > -	return 0;
> > +	return max9286_set_pixelrate(priv);
>
> Aha - at first I thought this would call for every bind event, but we
> already filter so this tail end of the function only executes on the
> last bind :-)

Yes, we get there only when all remotes have been bound.
I wonder what happens though if something goes wrong and we end up returning
an error from _bound(). I assume the media graph won't complete and
that's desirable, so this should be enough


>
>
>
> >  }
> >
> >  static void max9286_notify_unbind(struct v4l2_async_notifier *notifier,
> > @@ -670,7 +707,6 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
> >  {
> >  	struct max9286_priv *priv = sd_to_max9286(sd);
> >  	struct v4l2_mbus_framefmt *cfg_fmt;
> > -	s64 pixelrate;
> >
> >  	if (format->pad >= MAX9286_SRC_PAD)
> >  		return -EINVAL;
> > @@ -695,12 +731,6 @@ static int max9286_set_fmt(struct v4l2_subdev *sd,
> >  	*cfg_fmt = format->format;
> >  	mutex_unlock(&priv->mutex);
> >
> > -	/* Update pixel rate for the CSI2 receiver */
> > -	pixelrate = cfg_fmt->width * cfg_fmt->height
> > -		  * priv->nsources * 30 /*FPS*/;
> > -
> > -	max9286_set_pixelrate(priv, pixelrate);
> > -
> >  	return 0;
> >  }
> >
> >
>

Re: [v8-rc1 15/20] squash! max9286: Disable overlap window

[Jacopo Mondi]

Hi Kieran,

On Thu, Apr 16, 2020 at 12:31:32PM +0100, Kieran Bingham wrote:
> On 16/04/2020 12:31, Jacopo Mondi wrote:
> > Hi Kieran,
> >
> > On Thu, Apr 16, 2020 at 11:50:07AM +0100, Kieran Bingham wrote:
> >> Hi Jacopo,
> >>
> >> On 16/04/2020 11:40, Jacopo Mondi wrote:
> >>> From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> >>>
> >>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> >>>
> >>> ---
> >>> v2:
> >>>   [Jacopo]
> >>>   - Write register 0x63 and 0x64 directly as going through the function
> >>>     breaks RDACM21 operations
> >>> ---
> >>>  drivers/media/i2c/max9286.c | 12 ++++++++++++
> >>>  1 file changed, 12 insertions(+)
> >>>
> >>> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
> >>> index 3ef74ba10074..e0c637d4a7de 100644
> >>> --- a/drivers/media/i2c/max9286.c
> >>> +++ b/drivers/media/i2c/max9286.c
> >>> @@ -966,6 +966,18 @@ static int max9286_setup(struct max9286_priv *priv)
> >>>  	max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
> >>>  		      MAX9286_HVSRC_D14);
> >>>
> >>> +	/*
> >>> +	 * The overlap window seems to provide additional validation by tracking
> >>> +	 * the delay between vsync and frame sync, generating an error if the
> >>> +	 * delay is bigger than the programmed window, though it's not yet clear
> >>> +	 * what value should be set.
> >>> +	 *
> >>> +	 * As it's an optional value and can be disabled, we do so by setting
> >>> +	 * a 0 overlap value.
> >>
> >> Are you happy to add the following as part of the removal of the function?
> >>
> >> 	 *
> >> 	 * The overlap window is a 13 bit value, and register 0x64 is
> >> 	 * shared with ENFSINLAST in BIT(5) which is also set zero.
> >> 	 *
> >
> > Not sure, as I noticed failres for RDACM21 when not writing the
> > supposidely reserved bits.
> >
> > As we blindly write the full registers I would leave details out until
> > we figure out what's happening.
>
> But that's precisely why I think we should document it :-) Otherwise -
> some other person could hit this issue in a different way...

In that case yes, I was concerned about the "reserved bits", but
please go ahead and add that comment.

>
> >
> >>
> >>> +	 */
> >>> +	max9286_write(priv, 0x63, 0);
> >>> +	max9286_write(priv, 0x64, 0);
> >>> +
> >>>  	/*
> >>>  	 * Wait for 2ms to allow the link to resynchronize after the
> >>>  	 * configuration change.
> >>>
> >>
>