Re: [PATCH v6 1/5] media: i2c: Add driver for RDACM21 camera module

From: Laurent Pinchart
Date: Wed Dec 16 2020 - 12:02:10 EST

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Hi Jacopo,

Thank you for the patch.

On Tue, Dec 15, 2020 at 06:09:53PM +0100, Jacopo Mondi wrote:
> The RDACM21 is a GMSL camera supporting 1280x1080 resolution images
> developed by IMI based on an Omnivision OV10640 sensor, an Omnivision
> OV490 ISP and a Maxim MAX9271 GMSL serializer.
>
> The driver uses the max9271 library module, to maximize code reuse with
> other camera module drivers using the same serializer, such as rdacm20.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> ---
> MAINTAINERS | 12 +
> drivers/media/i2c/Kconfig | 13 +
> drivers/media/i2c/Makefile | 2 +
> drivers/media/i2c/rdacm21.c | 595 ++++++++++++++++++++++++++++++++++++
> 4 files changed, 622 insertions(+)
> create mode 100644 drivers/media/i2c/rdacm21.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4be038f0a59d..a011df5a14d7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14809,6 +14809,18 @@ F: drivers/media/i2c/max9271.c
> F: drivers/media/i2c/max9271.h
> F: drivers/media/i2c/rdacm20.c
>
> +RDACM21 Camera Sensor
> +M: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> +M: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> +M: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> +M: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> +L: linux-media@xxxxxxxxxxxxxxx
> +S: Maintained
> +F: Documentation/devicetree/bindings/media/i2c/rdacm2x-gmsl.yaml
> +F: drivers/media/i2c/max9271.c
> +F: drivers/media/i2c/max9271.h
> +F: drivers/media/i2c/rdacm21.c
> +
> RDC R-321X SoC
> M: Florian Fainelli <florian@xxxxxxxxxxx>
> S: Maintained
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 2b9d81e4794a..d500edb8638b 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -1212,6 +1212,19 @@ config VIDEO_RDACM20
> This camera should be used in conjunction with a GMSL
> deserialiser such as the MAX9286.
>
> +config VIDEO_RDACM21
> + tristate "IMI RDACM21 camera support"
> + depends on I2C
> + select V4L2_FWNODE
> + select VIDEO_V4L2_SUBDEV_API
> + select MEDIA_CONTROLLER
> + help
> + This driver supports the IMI RDACM21 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 a3149dce21bb..85b1edc62508 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -124,6 +124,8 @@ obj-$(CONFIG_VIDEO_IMX355) += imx355.o
> obj-$(CONFIG_VIDEO_MAX9286) += max9286.o
> rdacm20-camera_module-objs := rdacm20.o max9271.o
> obj-$(CONFIG_VIDEO_RDACM20) += rdacm20-camera_module.o
> +rdacm21-camera_module-objs := rdacm21.o max9271.o
> +obj-$(CONFIG_VIDEO_RDACM21) += rdacm21-camera_module.o
> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
>
> obj-$(CONFIG_SDR_MAX2175) += max2175.o
> diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c
> new file mode 100644
> index 000000000000..5f9267e26258
> --- /dev/null
> +++ b/drivers/media/i2c/rdacm21.c
> @@ -0,0 +1,595 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * IMI RDACM21 GMSL Camera Driver
> + *
> + * Copyright (C) 2017-2020 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/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 OV10640_ID_LOW 0xa6
> +
> +#define OV490_I2C_ADDRESS 0x24
> +
> +#define OV490_PAGE_HIGH_REG 0xfffd
> +#define OV490_PAGE_LOW_REG 0xfffe
> +
> +#define OV490_DVP_CTRL3 0x80286009
> +
> +#define OV490_ODS_CTRL_FRAME_OUTPUT_EN 0x0c
> +#define OV490_ODS_CTRL 0x8029d000
> +
> +#define OV490_ID_VAL 0x0490
> +#define OV490_ID(_p, _v) ((((_p) & 0xff) << 8) | ((_v) & 0xff))
> +#define OV490_PID 0x8080300a
> +#define OV490_VER 0x8080300b
> +
> +#define OV490_ISP_HSIZE_LOW 0x80820060
> +#define OV490_ISP_HSIZE_HIGH 0x80820061
> +#define OV490_ISP_VSIZE_LOW 0x80820062
> +#define OV490_ISP_VSIZE_HIGH 0x80820063
> +
> +#define OV10640_PIXEL_RATE (55000000)

No need for parentheses.

At some point we should move the sensor and ISP-related code to a
separate driver, but that can wait.

> +
> +struct rdacm21_device {
> + struct device *dev;
> + struct max9271_device *serializer;
> + struct i2c_client *isp;
> + struct v4l2_subdev sd;
> + struct media_pad pad;
> + struct v4l2_mbus_framefmt fmt;
> + struct v4l2_ctrl_handler ctrls;
> + u32 addrs[32];

Do we need 32 addresses ? 2 seem enough.

> + u16 last_page;
> +};
> +
> +static inline struct rdacm21_device *sd_to_rdacm21(struct v4l2_subdev *sd)
> +{
> + return container_of(sd, struct rdacm21_device, sd);
> +}
> +
> +static inline struct rdacm21_device *i2c_to_rdacm21(struct i2c_client *client)
> +{
> + return sd_to_rdacm21(i2c_get_clientdata(client));
> +}

As this is used in the remove handler only you could inline it there, up
to you.

> +
> +static const struct ov490_reg {
> + u16 reg;
> + u8 val;
> +} ov490_regs_wizard[] = {
> + {0xfffd, 0x80},
> + {0xfffe, 0x82},
> + {0x0071, 0x11},
> + {0x0075, 0x11},
> + {0xfffe, 0x29},
> + {0x6010, 0x01},
> + /*
> + * OV490 EMB line disable in YUV and RAW data,
> + * NOTE: EMB line is still used in ISP and sensor
> + */
> + {0xe000, 0x14},
> + {0xfffe, 0x28},
> + {0x6000, 0x04},
> + {0x6004, 0x00},
> + /*
> + * PCLK polarity - useless due to silicon bug.
> + * Use 0x808000bb register instead.
> + */
> + {0x6008, 0x00},
> + {0xfffe, 0x80},
> + {0x0091, 0x00},
> + /* bit[3]=0 - PCLK polarity workaround. */
> + {0x00bb, 0x1d},
> + /* Ov490 FSIN: app_fsin_from_fsync */
> + {0xfffe, 0x85},
> + {0x0008, 0x00},
> + {0x0009, 0x01},
> + /* FSIN0 source. */
> + {0x000A, 0x05},
> + {0x000B, 0x00},
> + /* FSIN0 delay. */
> + {0x0030, 0x02},
> + {0x0031, 0x00},
> + {0x0032, 0x00},
> + {0x0033, 0x00},
> + /* FSIN1 delay. */
> + {0x0038, 0x02},
> + {0x0039, 0x00},
> + {0x003A, 0x00},
> + {0x003B, 0x00},
> + /* FSIN0 length. */
> + {0x0070, 0x2C},
> + {0x0071, 0x01},
> + {0x0072, 0x00},
> + {0x0073, 0x00},
> + /* FSIN1 length. */
> + {0x0074, 0x64},
> + {0x0075, 0x00},
> + {0x0076, 0x00},
> + {0x0077, 0x00},
> + {0x0000, 0x14},
> + {0x0001, 0x00},
> + {0x0002, 0x00},
> + {0x0003, 0x00},
> + /*
> + * Load fsin0,load fsin1,load other,
> + * It will be cleared automatically.
> + */
> + {0x0004, 0x32},
> + {0x0005, 0x00},
> + {0x0006, 0x00},
> + {0x0007, 0x00},
> + {0xfffe, 0x80},
> + /* Sensor FSIN. */
> + {0x0081, 0x00},
> + /* ov10640 FSIN enable */
> + {0xfffe, 0x19},
> + {0x5000, 0x00},
> + {0x5001, 0x30},
> + {0x5002, 0x8c},
> + {0x5003, 0xb2},
> + {0xfffe, 0x80},
> + {0x00c0, 0xc1},
> + /* ov10640 HFLIP=1 by default */
> + {0xfffe, 0x19},
> + {0x5000, 0x01},
> + {0x5001, 0x00},
> + {0xfffe, 0x80},
> + {0x00c0, 0xdc},
> +};
> +
> +static int ov490_read(struct rdacm21_device *dev, u16 reg, u8 *val)
> +{
> + u8 buf[2] = { reg >> 8, reg };
> + int ret;
> +
> + ret = i2c_master_send(dev->isp, buf, 2);
> + if (ret == 2)
> + ret = i2c_master_recv(dev->isp, val, 1);
> +
> + if (ret < 0) {
> + dev_dbg(dev->dev, "%s: register 0x%04x read failed (%d)\n",
> + __func__, reg, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ov490_write(struct rdacm21_device *dev, u16 reg, u8 val)
> +{
> + u8 buf[3] = { reg >> 8, reg, val };
> + int ret;
> +
> + ret = i2c_master_send(dev->isp, buf, 3);
> + if (ret < 0) {
> + dev_err(dev->dev, "%s: register 0x%04x write failed (%d)\n",
> + __func__, reg, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ov490_set_page(struct rdacm21_device *dev, u16 reg)

s/reg/page/

> +{
> + bool page_new = false;
> + u8 page_high = reg >> 8;
> + u8 page_low = reg;
> + int ret;
> +

If you add

if (page == dev->last_page)
return 0;

here, you can drop the page_new variable.

> + if (page_high != (dev->last_page >> 8)) {
> + ret = ov490_write(dev, OV490_PAGE_HIGH_REG, page_high);
> + if (ret)
> + return ret;
> + page_new = true;
> + }
> +
> + if (page_low != (u8)dev->last_page) {
> + ret = ov490_write(dev, OV490_PAGE_LOW_REG, page_low);
> + if (ret)
> + return ret;
> + page_new = true;
> + }
> +
> + if (page_new) {
> + dev->last_page = reg;
> + usleep_range(100, 150);
> + }
> +
> + return 0;
> +}
> +
> +static int ov490_read_reg(struct rdacm21_device *dev, u32 reg, u8 *val)
> +{
> + int ret;
> +
> + ret = ov490_set_page(dev, reg >> 16);
> + if (ret)
> + return ret;
> +
> + ret = ov490_read(dev, (u16)reg, val);
> + if (ret)
> + return ret;
> +
> + dev_dbg(dev->dev, "%s: 0x%08x = 0x%02x\n", __func__, reg, *val);
> +
> + return 0;
> +}
> +
> +static int ov490_write_reg(struct rdacm21_device *dev, u32 reg, u8 val)
> +{
> + int ret;
> +
> + ret = ov490_set_page(dev, reg >> 16);
> + if (ret)
> + return ret;
> +
> + ret = ov490_write(dev, (u16)reg, val);
> + if (ret)
> + return ret;
> +
> + dev_dbg(dev->dev, "%s: 0x%08x = 0x%02x\n", __func__, reg, val);
> +
> + return 0;
> +}
> +
> +static int rdacm21_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> + struct rdacm21_device *dev = sd_to_rdacm21(sd);
> +
> + /*
> + * Enable serial link now that the ISP provides a valid pixel clock
> + * to start serializing video data on the GMSL link.
> + */
> + return max9271_set_serial_link(dev->serializer, enable);
> +}
> +
> +static int rdacm21_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_YUYV8_1X16;
> +
> + return 0;
> +}
> +
> +static int rdacm21_get_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *format)
> +{
> + struct v4l2_mbus_framefmt *mf = &format->format;
> + struct rdacm21_device *dev = sd_to_rdacm21(sd);
> +
> + if (format->pad)
> + return -EINVAL;
> +
> + mf->width = dev->fmt.width;
> + mf->height = dev->fmt.height;
> + mf->code = MEDIA_BUS_FMT_YUYV8_1X16;
> + mf->colorspace = V4L2_COLORSPACE_SRGB;
> + 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 rdacm21_video_ops = {

static const

> + .s_stream = rdacm21_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops rdacm21_subdev_pad_ops = {
> + .enum_mbus_code = rdacm21_enum_mbus_code,
> + .get_fmt = rdacm21_get_fmt,
> + .set_fmt = rdacm21_get_fmt,
> +};
> +
> +static struct v4l2_subdev_ops rdacm21_subdev_ops = {

static const

> + .video = &rdacm21_video_ops,
> + .pad = &rdacm21_subdev_pad_ops,
> +};
> +
> +static int ov490_initialize(struct rdacm21_device *dev)
> +{
> + unsigned int ov490_pid_retry = 20;
> + unsigned int timeout;
> + u8 pid, ver, val;
> + unsigned int i;
> + int ret;
> +
> + /* Read OV490 Id to test communications. */
> +pid_retry:

Could we use a for or while loop instead of a goto ?

> + ret = ov490_read_reg(dev, OV490_PID, &pid);
> + if (ret < 0) {
> + /* Give OV490 a few more cycles to exit from reset. */
> + if (ov490_pid_retry--) {
> + usleep_range(1000, 2000);
> + goto pid_retry;
> + }
> +
> + dev_err(dev->dev, "OV490 PID read failed (%d)\n", ret);
> + return ret;
> + }
> +
> + ret = ov490_read_reg(dev, OV490_VER, &ver);
> + if (ret < 0) {
> + dev_err(dev->dev, "OV490 VERSION read failed (%d)\n", ret);

There's already an error message printed in the read function, you can
drop this one.

> + return ret;
> + }
> +
> + if (OV490_ID(pid, ver) != OV490_ID_VAL) {
> + dev_err(dev->dev, "OV490 ID mismatch: (0x%04x)\n",

s/://

> + OV490_ID(pid, ver));
> + return -ENODEV;
> + }
> +
> + /* Wait for firmware boot by reading streamon status. */
> + for (timeout = 300; timeout > 0; timeout--) {
> + ov490_read_reg(dev, OV490_ODS_CTRL, &val);
> + if (val == OV490_ODS_CTRL_FRAME_OUTPUT_EN)
> + break;
> + mdelay(1);

A sleep is better than a delay.

> + }
> + if (!timeout) {
> + dev_err(dev->dev, "Timeout firmware boot wait\n");
> + return -ENODEV;
> + }
> + dev_dbg(dev->dev, "Firmware booted in %u msec\n", 300 - timeout);

That won't be a very accurate time measurement.

> +
> + /* Read OV10640 Id to test communications. */
> + ov490_write(dev, 0xfffd, 0x80);
> + ov490_write(dev, 0xfffe, 0x19);

The page is handled in ov490_write_reg(), can't we write

ov490_write_reg(dev, 0x80195000, 0x01);
ov490_write_reg(dev, 0x80195001, 0x30);
ov490_write_reg(dev, 0x80195002, 0x0a);

to simplify the code ? Same below.

> + usleep_range(100, 150);
> +
> + ov490_write(dev, 0x5000, 0x01);
> + ov490_write(dev, 0x5001, 0x30);
> + ov490_write(dev, 0x5002, 0x0a);
> +
> + ov490_write(dev, 0xfffe, 0x80);
> + usleep_range(100, 150);
> + ov490_write(dev, 0xc0, 0xc1);
> + ov490_write(dev, 0xfffe, 0x19);
> + usleep_range(1000, 1500);
> + ov490_read(dev, 0x5000, &val);
> + if (val != OV10640_ID_LOW) {
> + dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val);
> + return -ENODEV;
> + }
> +
> + dev_dbg(dev->dev, "OV10640 ID = 0x%2x\n", val);
> +
> + for (i = 0; i < ARRAY_SIZE(ov490_regs_wizard); ++i) {
> + ret = ov490_write(dev, ov490_regs_wizard[i].reg,
> + ov490_regs_wizard[i].val);
> + if (ret < 0) {
> + dev_err(dev->dev,
> + "%s: register %u (0x%04x) write failed (%d)\n",
> + __func__, i, ov490_regs_wizard[i].reg, ret);
> +
> + return -EIO;
> + }
> +
> + usleep_range(100, 150);
> + }
> +
> + /*
> + * The ISP is programmed with the content of a serial flash memory.
> + * Read the firmware configuration to reflect it through the V4L2 APIs.
> + */
> + ov490_read_reg(dev, OV490_ISP_HSIZE_HIGH, &val);
> + dev->fmt.width = (val & 0xf) << 8;
> + ov490_read_reg(dev, OV490_ISP_HSIZE_LOW, &val);
> + dev->fmt.width |= (val & 0xff);
> +
> + ov490_read_reg(dev, OV490_ISP_VSIZE_HIGH, &val);
> + dev->fmt.height = (val & 0xf) << 8;
> + ov490_read_reg(dev, OV490_ISP_VSIZE_LOW, &val);
> + dev->fmt.height |= val & 0xff;
> +
> + /* Set bus width to 12 bits with [0:11] ordering. */
> + ov490_write_reg(dev, OV490_DVP_CTRL3, 0x10);
> +
> + dev_info(dev->dev, "Identified RDACM21 camera module\n");
> +
> + return 0;
> +}
> +
> +static int rdacm21_initialize(struct rdacm21_device *dev)
> +{
> + 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;
> +
> + /* Set GPO high to hold OV490 in reset during max9271 configuration. */
> + ret = max9271_set_gpios(dev->serializer, MAX9271_GPO);
> + if (ret)
> + return ret;
> +
> + /* Configure I2C bus at 105Kbps speed and configure GMSL link. */
> + ret = max9271_configure_i2c(dev->serializer,
> + MAX9271_I2CSLVSH_469NS_234NS |
> + MAX9271_I2CSLVTO_1024US |
> + MAX9271_I2CMSTBT_105KBPS);
> + if (ret)
> + return ret;
> +
> + ret = max9271_configure_gmsl_link(dev->serializer);
> + if (ret)
> + return ret;
> +
> + ret = max9271_set_address(dev->serializer, dev->addrs[0]);
> + if (ret)
> + return ret;
> + dev->serializer->client->addr = dev->addrs[0];
> +
> + /*
> + * Release OV490 from reset and program address translation
> + * before performing OV490 configuration.
> + */
> + ret = max9271_clear_gpios(dev->serializer, MAX9271_GPO);
> + if (ret)
> + return ret;
> +
> + ret = max9271_set_translation(dev->serializer, dev->addrs[1],
> + OV490_I2C_ADDRESS);
> + if (ret)
> + return ret;
> + dev->isp->addr = dev->addrs[1];
> +
> + ret = ov490_initialize(dev);
> + if (ret)
> + return ret;
> +
> + /*
> + * Set reverse channel high threshold to increase noise immunity.
> + *
> + * This should be compensated by increasing the reverse channel
> + * amplitude on the remote deserializer side.
> + */
> + ret = max9271_set_high_threshold(dev->serializer, true);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int rdacm21_probe(struct i2c_client *client)
> +{
> + struct rdacm21_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);

Does this need to be allocated dynamically, can't the serializer field
be embedded ?

> + 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->isp = i2c_new_dummy_device(client->adapter, OV490_I2C_ADDRESS);
> + if (IS_ERR(dev->isp))
> + return PTR_ERR(dev->isp);
> +
> + ret = rdacm21_initialize(dev);
> + if (ret < 0)
> + goto error;
> +
> + /* Initialize and register the subdevice. */
> + v4l2_i2c_subdev_init(&dev->sd, client, &rdacm21_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,
> + OV10640_PIXEL_RATE, OV10640_PIXEL_RATE, 1,
> + OV10640_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(dev->sd.fwnode);
> +error_free_ctrls:
> + v4l2_ctrl_handler_free(&dev->ctrls);
> +error:
> + i2c_unregister_device(dev->isp);
> +
> + return ret;
> +}
> +
> +static int rdacm21_remove(struct i2c_client *client)
> +{
> + struct rdacm21_device *dev = i2c_to_rdacm21(client);
> +
> + fwnode_handle_put(dev->sd.fwnode);

Maybe this should go after unregistration of the subdev, to avoid a
use-after-free ? I'd move it to the end.

> + v4l2_async_unregister_subdev(&dev->sd);
> + v4l2_ctrl_handler_free(&dev->ctrls);
> + i2c_unregister_device(dev->isp);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id rdacm21_of_ids[] = {
> + { .compatible = "imi,rdacm21" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, rdacm21_of_ids);
> +
> +static struct i2c_driver rdacm21_i2c_driver = {
> + .driver = {
> + .name = "rdacm21",
> + .of_match_table = rdacm21_of_ids,
> + },
> + .probe_new = rdacm21_probe,
> + .remove = rdacm21_remove,
> +};
> +
> +module_i2c_driver(rdacm21_i2c_driver);
> +
> +MODULE_DESCRIPTION("GMSL Camera driver for RDACM21");
> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov");

Did I author any code in this driver ?

> +MODULE_LICENSE("GPL v2");

--
Regards,

Laurent Pinchart

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