[V4, 0/2] media: i2c: Add support for OV02A10 sensor

[V4, 0/2] media: i2c: Add support for OV02A10 sensor

[dongchun.zhu]

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

Hello,

This patch adds driver and bindings for Omnivision's OV02A10 2 megapixel CMOS 1/5" sensor,
which has a single MIPI lane interface and output format of 10-bit Raw.

The driver is implemented wth V4L2 framework.
1. Async registered as a V4L2 I2C sub-device.
2. A media entity that can provide several source pads and sink pads to link with other device like Seninf, ISP one after another
   to create a default overall camera topology, image frame or meta-data from sensor can flow through particular path to output
   preview or capture image or 3A info.

Changes of v4 mainly address the comments from Sakari, Rob, Tomasz.
 - Remove data-lanes property in DT
 - Add link frequencies in DT to match the expect value that driver requires
 - Omit open callback as int_cfg is implemented
 - Use i2c_smbus_write_byte_data/i2c_smbus_read_byte_data instead of customed APIs
 - Use do_div to calculate pixel rate
 - Use usleep_range directly for shoter sleep case
 - Re-adjust sensor power up/off sequence
 - Re-set pd/rst GPIO inverter property according to the datasheet
 - Refine set_exposure/set_gain/set_vblanking/set_test_pattern functions
 - Fix other reviewed issues in v3

Changes of v3 are mainly addressing comments from Rob, Sakari, Bingbu.
 - Fix coding style errors in dt-bindings
 - Use macro flag to describle basic line 1224 when updating v-blanking
 - Remove unnecessary debug log in driver

Mainly changes of v2 are addressing the comments from Nicolas, Bingbu, Sakari, Rob,
including,
 - Put dt binding before driver in series
 - Add MAINTAINERS entries
 - Squash the MAINTAINERS entry and Kconfig to driver patch
 - Add rotation support for driver
 - Fix other reviewed issues in v1

Dongchun Zhu (2):
  media: dt-bindings: media: i2c: Add bindings for OV02A10
  media: i2c: Add Omnivision OV02A10 camera sensor driver

 .../devicetree/bindings/media/i2c/ov02a10.txt      |   54 +
 MAINTAINERS                                        |    8 +
 drivers/media/i2c/Kconfig                          |   11 +
 drivers/media/i2c/Makefile                         |    1 +
 drivers/media/i2c/ov02a10.c                        | 1062 ++++++++++++++++++++
 5 files changed, 1136 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt
 create mode 100644 drivers/media/i2c/ov02a10.c

-- 
2.9.2

[V4, 1/2] media: dt-bindings: media: i2c: Add bindings for OV02A10

[dongchun.zhu]

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

This patch adds device tree bindings documentation for OV02A10 camera sensor.

Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
---
 .../devicetree/bindings/media/i2c/ov02a10.txt      | 54 ++++++++++++++++++++++
 MAINTAINERS                                        |  7 +++
 2 files changed, 61 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/ov02a10.txt b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
new file mode 100644
index 0000000..18acc4f
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
@@ -0,0 +1,54 @@
+* Omnivision OV02A10 MIPI CSI-2 sensor
+
+Required Properties:
+- compatible: shall be "ovti,ov02a10"
+- clocks: reference to the eclk input clock
+- clock-names: shall be "eclk"
+- dovdd-supply: Digital I/O voltage supply, 1.8 volts
+- avdd-supply: Analog voltage supply, 2.8 volts
+- dvdd-supply: Digital core voltage supply, 1.8 volts
+- powerdown-gpios: reference to the GPIO connected to the powerdown pin,
+		   if any. This is an active low signal to the OV02A10.
+- reset-gpios: reference to the GPIO connected to the reset pin, if any.
+	       This is an active high signal to the OV02A10.
+
+Optional Properties:
+- rotation: as defined in
+	    Documentation/devicetree/bindings/media/video-interfaces.txt,
+	    valid values are 0 (sensor mounted upright) and 180 (sensor
+	    mounted upside down).
+
+The device node shall contain one 'port' child node with an
+'endpoint' subnode for its digital output video port,
+in accordance with the video interface bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+Example:
+&i2c4 {
+	ov02a10: camera-sensor@3d {
+		compatible = "ovti,ov02a10";
+		reg = <0x3d>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&camera_pins_cam1_mclk_on>;
+
+		clocks = <&topckgen CLK_TOP_MUX_CAMTG2>,
+			<&topckgen CLK_TOP_UNIVP_192M_D8>;
+		clock-names = "eclk", "freq_mux";
+		clock-frequency = <24000000>;
+
+		dovdd-supply = <&mt6358_vcamio_reg>;
+		avdd-supply = <&mt6358_vcama1_reg>;
+		dvdd-supply = <&mt6358_vcn18_reg>;
+		powerdown-gpios = <&pio 107 GPIO_ACTIVE_LOW>;
+		reset-gpios = <&pio 109 GPIO_ACTIVE_HIGH>;
+		rotation = <180>;
+
+		port {
+			/* MIPI CSI-2 bus endpoint */
+			ov02a10_core: endpoint {
+				remote-endpoint = <&ov02a10_0>;
+				link-frequencies = /bits/ 64 <390000000>;
+			};
+		};
+	};
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 783569e..41734fb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11816,6 +11816,13 @@ T:	git git://linuxtv.org/media_tree.git
 S:	Maintained
 F:	drivers/media/i2c/ov13858.c
 
+OMNIVISION OV02A10 SENSOR DRIVER
+M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
+L:	linux-media@vger.kernel.org
+T:	git git://linuxtv.org/media_tree.git
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/i2c/ov02a10.txt
+
 OMNIVISION OV2680 SENSOR DRIVER
 M:	Rui Miguel Silva <rmfrfs@gmail.com>
 L:	linux-media@vger.kernel.org
-- 
2.9.2

Re: [V4, 1/2] media: dt-bindings: media: i2c: Add bindings for OV02A10

[Sakari Ailus]

Hi Dongchun,

On Sat, Sep 07, 2019 at 05:27:27PM +0800, dongchun.zhu@mediatek.com wrote:
> From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> 
> This patch adds device tree bindings documentation for OV02A10 camera sensor.
> 
> Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>

Please remember to add acks you get.

> ---
>  .../devicetree/bindings/media/i2c/ov02a10.txt      | 54 ++++++++++++++++++++++
>  MAINTAINERS                                        |  7 +++
>  2 files changed, 61 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov02a10.txt b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> new file mode 100644
> index 0000000..18acc4f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> @@ -0,0 +1,54 @@
> +* Omnivision OV02A10 MIPI CSI-2 sensor
> +
> +Required Properties:
> +- compatible: shall be "ovti,ov02a10"
> +- clocks: reference to the eclk input clock
> +- clock-names: shall be "eclk"
> +- dovdd-supply: Digital I/O voltage supply, 1.8 volts
> +- avdd-supply: Analog voltage supply, 2.8 volts
> +- dvdd-supply: Digital core voltage supply, 1.8 volts
> +- powerdown-gpios: reference to the GPIO connected to the powerdown pin,
> +		   if any. This is an active low signal to the OV02A10.
> +- reset-gpios: reference to the GPIO connected to the reset pin, if any.
> +	       This is an active high signal to the OV02A10.
> +
> +Optional Properties:
> +- rotation: as defined in
> +	    Documentation/devicetree/bindings/media/video-interfaces.txt,
> +	    valid values are 0 (sensor mounted upright) and 180 (sensor
> +	    mounted upside down).

This needs to be either mandatory or the default needs to be documented. I
think it could be simply:

	    Documentation/devicetree/bindings/media/video-interfaces.txt,
	    valid values are 0 (sensor mounted upright; the default) and
	    180 (sensor mounted upside down).

> +
> +The device node shall contain one 'port' child node with an
> +'endpoint' subnode for its digital output video port,
> +in accordance with the video interface bindings defined in
> +Documentation/devicetree/bindings/media/video-interfaces.txt.
> +
> +Example:
> +&i2c4 {
> +	ov02a10: camera-sensor@3d {
> +		compatible = "ovti,ov02a10";
> +		reg = <0x3d>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&camera_pins_cam1_mclk_on>;
> +
> +		clocks = <&topckgen CLK_TOP_MUX_CAMTG2>,
> +			<&topckgen CLK_TOP_UNIVP_192M_D8>;
> +		clock-names = "eclk", "freq_mux";
> +		clock-frequency = <24000000>;
> +
> +		dovdd-supply = <&mt6358_vcamio_reg>;
> +		avdd-supply = <&mt6358_vcama1_reg>;
> +		dvdd-supply = <&mt6358_vcn18_reg>;
> +		powerdown-gpios = <&pio 107 GPIO_ACTIVE_LOW>;
> +		reset-gpios = <&pio 109 GPIO_ACTIVE_HIGH>;
> +		rotation = <180>;
> +
> +		port {
> +			/* MIPI CSI-2 bus endpoint */
> +			ov02a10_core: endpoint {
> +				remote-endpoint = <&ov02a10_0>;
> +				link-frequencies = /bits/ 64 <390000000>;
> +			};
> +		};
> +	};
> +};
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 783569e..41734fb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11816,6 +11816,13 @@ T:	git git://linuxtv.org/media_tree.git
>  S:	Maintained
>  F:	drivers/media/i2c/ov13858.c
>  
> +OMNIVISION OV02A10 SENSOR DRIVER
> +M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
> +L:	linux-media@vger.kernel.org
> +T:	git git://linuxtv.org/media_tree.git
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> +
>  OMNIVISION OV2680 SENSOR DRIVER
>  M:	Rui Miguel Silva <rmfrfs@gmail.com>
>  L:	linux-media@vger.kernel.org

-- 
Regards,

Sakari Ailus
sakari.ailus@linux.intel.com

Re: [V4, 1/2] media: dt-bindings: media: i2c: Add bindings for OV02A10

[Andy Shevchenko]

On Sat, Sep 07, 2019 at 05:27:27PM +0800, dongchun.zhu@mediatek.com wrote:
> From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> 
> This patch adds device tree bindings documentation for OV02A10 camera sensor.
> 
> Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> ---
>  .../devicetree/bindings/media/i2c/ov02a10.txt      | 54 ++++++++++++++++++++++

>  MAINTAINERS                                        |  7 +++

This doesn't belong to dt-bindings.

-- 
With Best Regards,
Andy Shevchenko

Re: [V4, 1/2] media: dt-bindings: media: i2c: Add bindings for OV02A10

[Sakari Ailus]

Hi Andy,

On Mon, Sep 09, 2019 at 12:45:01PM +0300, Andy Shevchenko wrote:
> On Sat, Sep 07, 2019 at 05:27:27PM +0800, dongchun.zhu@mediatek.com wrote:
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > 
> > This patch adds device tree bindings documentation for OV02A10 camera sensor.
> > 
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > ---
> >  .../devicetree/bindings/media/i2c/ov02a10.txt      | 54 ++++++++++++++++++++++
> 
> >  MAINTAINERS                                        |  7 +++
> 
> This doesn't belong to dt-bindings.

The practice has been to add the MAINTAINERS entry along with the DT
bindings.

-- 
Sakari Ailus
sakari.ailus@linux.intel.com

Re: [V4, 1/2] media: dt-bindings: media: i2c: Add bindings for OV02A10

[Andy Shevchenko]

On Mon, Sep 09, 2019 at 12:57:15PM +0300, Sakari Ailus wrote:
> Hi Andy,
> 
> On Mon, Sep 09, 2019 at 12:45:01PM +0300, Andy Shevchenko wrote:
> > On Sat, Sep 07, 2019 at 05:27:27PM +0800, dongchun.zhu@mediatek.com wrote:
> > > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > > 
> > > This patch adds device tree bindings documentation for OV02A10 camera sensor.
> > > 
> > > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > > ---
> > >  .../devicetree/bindings/media/i2c/ov02a10.txt      | 54 ++++++++++++++++++++++
> > 
> > >  MAINTAINERS                                        |  7 +++
> > 
> > This doesn't belong to dt-bindings.
> 
> The practice has been to add the MAINTAINERS entry along with the DT
> bindings.

Ah, okay, good to know!

-- 
With Best Regards,
Andy Shevchenko

[V4, 2/2] media: i2c: Add Omnivision OV02A10 camera sensor driver

[dongchun.zhu]

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

This patch adds a V4L2 sub-device driver for OV02A10 image sensor.
The OV02A10 is a 1/5" CMOS sensor from Omnivision,
supporting output format: 10-bit Raw.

The OV02A10 has a single MIPI lane interface and use the I2C bus
for control and the CSI-2 bus for data.

Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
---
 MAINTAINERS                 |    1 +
 drivers/media/i2c/Kconfig   |   11 +
 drivers/media/i2c/Makefile  |    1 +
 drivers/media/i2c/ov02a10.c | 1062 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 1075 insertions(+)
 create mode 100644 drivers/media/i2c/ov02a10.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 41734fb..4b714a2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11821,6 +11821,7 @@ M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
 L:	linux-media@vger.kernel.org
 T:	git git://linuxtv.org/media_tree.git
 S:	Maintained
+F:	drivers/media/i2c/ov02a10.c
 F:	Documentation/devicetree/bindings/media/i2c/ov02a10.txt
 
 OMNIVISION OV2680 SENSOR DRIVER
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 79ce9ec..22e0db4 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -617,6 +617,17 @@ config VIDEO_IMX355
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx355.
 
+config VIDEO_OV02A10
+	tristate "OmniVision OV02A10 sensor support"
+	depends on VIDEO_V4L2 && I2C
+	depends on MEDIA_CAMERA_SUPPORT
+	help
+	  This is a Video4Linux2 sensor driver for the OmniVision
+	  OV02A10 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov02a10.
+
 config VIDEO_OV2640
 	tristate "OmniVision OV2640 sensor support"
 	depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index fd4ea86..d27f4e2 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
 obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
 obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
 obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
+obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
 obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
 obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
 obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
new file mode 100644
index 0000000..fb677d5
--- /dev/null
+++ b/drivers/media/i2c/ov02a10.c
@@ -0,0 +1,1062 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 MediaTek Inc.
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <media/media-entity.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-fwnode.h>
+
+#define CHIP_ID						0x2509
+#define OV02A10_REG_CHIP_ID_H				0x02
+#define OV02A10_REG_CHIP_ID_L				0x03
+#define OV02A10_ID(_msb, _lsb)				((_msb) << 8 | (_lsb))
+
+/* Bit[1] vertical upside down */
+/* Bit[0] horizontal mirror */
+#define REG_MIRROR_FLIP_CONTROL				0x3f
+
+/* Orientation */
+#define REG_MIRROR_FLIP_ENABLE				0x03
+
+#define REG_PAGE_SWITCH					0xfd
+#define REG_GLOBAL_EFFECTIVE				0x01
+#define REG_ENABLE					BIT(0)
+#define OV02A10_MASK_8_BITS				0xff
+
+#define REG_SC_CTRL_MODE				0xac
+#define SC_CTRL_MODE_STANDBY				0x00
+#define SC_CTRL_MODE_STREAMING				0x01
+
+#define OV02A10_EXP_SHIFT				8
+#define OV02A10_REG_EXPOSURE_H				0x03
+#define OV02A10_REG_EXPOSURE_L				0x04
+#define	OV02A10_EXPOSURE_MIN				4
+#define OV02A10_EXPOSURE_MAX_MARGIN			4
+#define	OV02A10_EXPOSURE_STEP				1
+
+#define OV02A10_VTS_SHIFT				8
+#define OV02A10_REG_VTS_H				0x05
+#define OV02A10_REG_VTS_L				0x06
+#define OV02A10_VTS_MAX					0x209f
+#define OV02A10_VTS_MIN					0x04cf
+#define OV02A10_BASIC_LINE				1224
+
+#define OV02A10_REG_GAIN				0x24
+#define OV02A10_GAIN_MIN				0x10
+#define OV02A10_GAIN_MAX				0xf8
+#define OV02A10_GAIN_STEP				0x01
+#define OV02A10_GAIN_DEFAULT				0x40
+
+/* Test pattern control */
+#define OV02A10_REG_TEST_PATTERN			0xb6
+#define OV02A10_TEST_PATTERN_ENABLE			BIT(0)
+
+#define OV02A10_LINK_FREQ_390MHZ			390000000ULL
+#define OV02A10_ECLK_FREQ				24000000
+#define OV02A10_DATA_LANES				1
+#define OV02A10_BITS_PER_SAMPLE				10
+
+static const char * const ov02a10_supply_names[] = {
+	"dovdd",	/* Digital I/O power */
+	"avdd",		/* Analog power */
+	"dvdd",		/* Digital core power */
+};
+
+#define OV02A10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
+
+struct ov02a10_reg {
+	u8 addr;
+	u8 val;
+};
+
+struct ov02a10_reg_list {
+	u32 num_of_regs;
+	const struct ov02a10_reg *regs;
+};
+
+struct ov02a10_mode {
+	u32 width;
+	u32 height;
+	u32 exp_def;
+	u32 hts_def;
+	u32 vts_def;
+	const struct ov02a10_reg_list reg_list;
+};
+
+struct ov02a10 {
+	struct clk		*eclk;
+	u32 eclk_freq;
+
+	struct gpio_desc	*pd_gpio;
+	struct gpio_desc	*n_rst_gpio;
+	struct regulator_bulk_data supplies[OV02A10_NUM_SUPPLIES];
+
+	bool			streaming;
+	bool			upside_down;
+
+	/*
+	 * Serialize control access, get/set format, get selection
+	 * and start streaming.
+	 */
+	struct mutex		mutex;
+	struct v4l2_subdev	subdev;
+	struct media_pad	pad;
+	struct v4l2_ctrl	*anal_gain;
+	struct v4l2_ctrl	*exposure;
+	struct v4l2_ctrl	*hblank;
+	struct v4l2_ctrl	*vblank;
+	struct v4l2_ctrl	*hflip;
+	struct v4l2_ctrl	*vflip;
+	struct v4l2_ctrl	*test_pattern;
+	struct v4l2_mbus_framefmt	fmt;
+	struct v4l2_ctrl_handler ctrl_handler;
+
+	const struct ov02a10_mode *cur_mode;
+};
+
+static inline struct ov02a10 *to_ov02a10(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct ov02a10, subdev);
+}
+
+/*
+ * eclk 24Mhz
+ * pclk 39Mhz
+ * linelength 934(0x3a6)
+ * framelength 1390(0x56E)
+ * grabwindow_width 1600
+ * grabwindow_height 1200
+ * max_framerate 30fps
+ * mipi_datarate per lane 780Mbps
+ */
+static const struct ov02a10_reg ov02a10_1600x1200_regs[] = {
+	{0xfd, 0x01},
+	{0xac, 0x00},
+	{0xfd, 0x00},
+	{0x2f, 0x29},
+	{0x34, 0x00},
+	{0x35, 0x21},
+	{0x30, 0x15},
+	{0x33, 0x01},
+	{0xfd, 0x01},
+	{0x44, 0x00},
+	{0x2a, 0x4c},
+	{0x2b, 0x1e},
+	{0x2c, 0x60},
+	{0x25, 0x11},
+	{0x03, 0x01},
+	{0x04, 0xae},
+	{0x09, 0x00},
+	{0x0a, 0x02},
+	{0x06, 0xa6},
+	{0x31, 0x00},
+	{0x24, 0x40},
+	{0x01, 0x01},
+	{0xfb, 0x73},
+	{0xfd, 0x01},
+	{0x16, 0x04},
+	{0x1c, 0x09},
+	{0x21, 0x42},
+	{0x12, 0x04},
+	{0x13, 0x10},
+	{0x11, 0x40},
+	{0x33, 0x81},
+	{0xd0, 0x00},
+	{0xd1, 0x01},
+	{0xd2, 0x00},
+	{0x50, 0x10},
+	{0x51, 0x23},
+	{0x52, 0x20},
+	{0x53, 0x10},
+	{0x54, 0x02},
+	{0x55, 0x20},
+	{0x56, 0x02},
+	{0x58, 0x48},
+	{0x5d, 0x15},
+	{0x5e, 0x05},
+	{0x66, 0x66},
+	{0x68, 0x68},
+	{0x6b, 0x00},
+	{0x6c, 0x00},
+	{0x6f, 0x40},
+	{0x70, 0x40},
+	{0x71, 0x0a},
+	{0x72, 0xf0},
+	{0x73, 0x10},
+	{0x75, 0x80},
+	{0x76, 0x10},
+	{0x84, 0x00},
+	{0x85, 0x10},
+	{0x86, 0x10},
+	{0x87, 0x00},
+	{0x8a, 0x22},
+	{0x8b, 0x22},
+	{0x19, 0xf1},
+	{0x29, 0x01},
+	{0xfd, 0x01},
+	{0x9d, 0xd6},
+	{0xa0, 0x29},
+	{0xa1, 0x03},
+	{0xad, 0x62},
+	{0xae, 0x00},
+	{0xaf, 0x85},
+	{0xb1, 0x01},
+	{0x8e, 0x06},
+	{0x8f, 0x40},
+	{0x90, 0x04},
+	{0x91, 0xb0},
+	{0x45, 0x01},
+	{0x46, 0x00},
+	{0x47, 0x6c},
+	{0x48, 0x03},
+	{0x49, 0x8b},
+	{0x4a, 0x00},
+	{0x4b, 0x07},
+	{0x4c, 0x04},
+	{0x4d, 0xb7},
+	{0xf0, 0x40},
+	{0xf1, 0x40},
+	{0xf2, 0x40},
+	{0xf3, 0x40},
+	{0x3f, 0x00},
+	{0xfd, 0x01},
+	{0x05, 0x00},
+	{0x06, 0xa6},
+	{0xfd, 0x01},
+};
+
+static const char * const ov02a10_test_pattern_menu[] = {
+	"Disabled",
+	"Color Bar",
+};
+
+static const s64 link_freq_menu_items[] = {
+	OV02A10_LINK_FREQ_390MHZ
+};
+
+static u64 to_pixel_rate(u32 f_index)
+{
+	u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV02A10_DATA_LANES;
+
+	do_div(pixel_rate, OV02A10_BITS_PER_SAMPLE);
+
+	return pixel_rate;
+}
+
+static const struct ov02a10_mode supported_modes[] = {
+	{
+		.width = 1600,
+		.height = 1200,
+		.exp_def = 0x01ae,
+		.hts_def = 0x03a6,
+		.vts_def = 0x056e,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(ov02a10_1600x1200_regs),
+			.regs = ov02a10_1600x1200_regs,
+		},
+	},
+};
+
+static int ov02a10_write_array(struct ov02a10 *ov02a10,
+			       const struct ov02a10_reg_list *r_list)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < r_list->num_of_regs; i++) {
+		ret = i2c_smbus_write_byte_data(client,
+						r_list->regs[i].addr,
+						r_list->regs[i].val);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int ov02a10_read_smbus(struct ov02a10 *ov02a10, unsigned char reg,
+			      unsigned char *val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(client, reg);
+	if (ret >= 0) {
+		*val = (unsigned char)ret;
+		ret = 0;
+	}
+
+	return ret;
+}
+
+static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
+			     struct v4l2_mbus_framefmt *fmt)
+{
+	fmt->width = mode->width;
+	fmt->height = mode->height;
+	fmt->field = V4L2_FIELD_NONE;
+}
+
+static int ov02a10_set_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *fmt)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	mutex_lock(&ov02a10->mutex);
+
+	if (ov02a10->streaming) {
+		mutex_unlock(&ov02a10->mutex);
+		return -EBUSY;
+	}
+
+	/* Only one sensor mode supported */
+	mbus_fmt->code = ov02a10->fmt.code;
+	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
+	ov02a10->fmt = fmt->format;
+
+	mutex_unlock(&ov02a10->mutex);
+
+	return 0;
+}
+
+static int ov02a10_get_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *fmt)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	mutex_lock(&ov02a10->mutex);
+
+	fmt->format = ov02a10->fmt;
+	mbus_fmt->code = ov02a10->fmt.code;
+	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
+
+	mutex_unlock(&ov02a10->mutex);
+
+	return 0;
+}
+
+static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_mbus_code_enum *code)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+
+	if (code->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	code->code = ov02a10->fmt.code;
+
+	return 0;
+}
+
+static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_pad_config *cfg,
+				    struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (fse->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	fse->min_width  = supported_modes[fse->index].width;
+	fse->max_width  = supported_modes[fse->index].width;
+	fse->max_height = supported_modes[fse->index].height;
+	fse->min_height = supported_modes[fse->index].height;
+
+	return 0;
+}
+
+static int __ov02a10_power_on(struct ov02a10 *ov02a10)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	struct device *dev = &client->dev;
+	int ret;
+
+	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, GPIOD_OUT_LOW);
+	gpiod_set_value_cansleep(ov02a10->pd_gpio, GPIOD_OUT_HIGH);
+
+	ret = clk_prepare_enable(ov02a10->eclk);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable eclk\n");
+		return ret;
+	}
+
+	ret = regulator_bulk_enable(OV02A10_NUM_SUPPLIES, ov02a10->supplies);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable regulators\n");
+		goto disable_clk;
+	}
+	usleep_range(5000, 6000);
+
+	gpiod_set_value_cansleep(ov02a10->pd_gpio, GPIOD_OUT_LOW);
+	usleep_range(5000, 6000);
+
+	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, GPIOD_OUT_HIGH);
+	usleep_range(5000, 6000);
+
+	return 0;
+
+disable_clk:
+	clk_disable_unprepare(ov02a10->eclk);
+
+	return ret;
+}
+
+static void __ov02a10_power_off(struct ov02a10 *ov02a10)
+{
+	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, 1);
+	clk_disable_unprepare(ov02a10->eclk);
+	gpiod_set_value_cansleep(ov02a10->pd_gpio, 1);
+	regulator_bulk_disable(OV02A10_NUM_SUPPLIES, ov02a10->supplies);
+}
+
+static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	const struct ov02a10_reg_list *reg_list;
+	int ret;
+
+	/* Apply default values of current mode */
+	reg_list = &ov02a10->cur_mode->reg_list;
+	ret = ov02a10_write_array(ov02a10, reg_list);
+	if (ret)
+		return ret;
+
+	/* Apply customized values from user */
+	ret = __v4l2_ctrl_handler_setup(ov02a10->subdev.ctrl_handler);
+	if (ret)
+		return ret;
+
+	/* Set orientation to 180 degree */
+	if (ov02a10->upside_down) {
+		ret = i2c_smbus_write_byte_data(client, REG_MIRROR_FLIP_CONTROL,
+						REG_MIRROR_FLIP_ENABLE);
+		if (ret) {
+			dev_err(&client->dev, "failed to set orientation\n");
+			return ret;
+		}
+		ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
+						REG_ENABLE);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Set stream on register */
+	return i2c_smbus_write_byte_data(client,
+				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
+}
+
+static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+
+	return i2c_smbus_write_byte_data(client,
+				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
+}
+
+static int ov02a10_entity_init_cfg(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_pad_config *cfg)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct v4l2_subdev_format fmt = { 0 };
+
+	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
+	fmt.format.width = ov02a10->cur_mode->width;
+	fmt.format.height = ov02a10->cur_mode->width;
+
+	ov02a10_set_fmt(sd, cfg, &fmt);
+
+	return 0;
+}
+
+static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	int ret = 0;
+
+	dev_dbg(&client->dev, "ov02a10 s_stream (%d)\n", on);
+	mutex_lock(&ov02a10->mutex);
+
+	if (ov02a10->streaming == on)
+		goto unlock_and_return;
+
+	if (on) {
+		ret = pm_runtime_get_sync(&client->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(&client->dev);
+			goto unlock_and_return;
+		}
+
+		ret = __ov02a10_start_stream(ov02a10);
+		if (ret) {
+			__ov02a10_stop_stream(ov02a10);
+			ov02a10->streaming = !on;
+			goto err_rpm_put;
+		}
+	} else {
+		__ov02a10_stop_stream(ov02a10);
+		pm_runtime_put(&client->dev);
+	}
+
+	ov02a10->streaming = on;
+	mutex_unlock(&ov02a10->mutex);
+
+	return ret;
+
+err_rpm_put:
+	pm_runtime_put(&client->dev);
+unlock_and_return:
+	mutex_unlock(&ov02a10->mutex);
+
+	return ret;
+}
+
+static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+
+	return __ov02a10_power_on(ov02a10);
+}
+
+static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+
+	__ov02a10_power_off(ov02a10);
+
+	return 0;
+}
+
+static const struct dev_pm_ops ov02a10_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
+			   ov02a10_runtime_resume, NULL)
+};
+
+/*
+ * ov02a10_set_exposure - Function called when setting exposure time
+ * @priv: Pointer to device structure
+ * @val: Variable for exposure time, in the unit of micro-second
+ *
+ * Set exposure time based on input value.
+ *
+ * Return: 0 on success
+ */
+static int ov02a10_set_exposure(struct ov02a10 *ov02a10, int val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_H,
+					((val >> OV02A10_EXP_SHIFT) &
+					OV02A10_MASK_8_BITS));
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_L,
+					(val & OV02A10_MASK_8_BITS));
+	if (ret < 0)
+		return ret;
+
+	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
+					 REG_ENABLE);
+}
+
+static int ov02a10_set_gain(struct ov02a10 *ov02a10, int val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_GAIN,
+					(val & OV02A10_MASK_8_BITS));
+	if (ret < 0)
+		return ret;
+
+	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
+					 REG_ENABLE);
+}
+
+static int ov02a10_set_vblank(struct ov02a10 *ov02a10, int val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H,
+					(((val + ov02a10->cur_mode->height -
+					OV02A10_BASIC_LINE) >>
+					OV02A10_VTS_SHIFT) &
+					OV02A10_MASK_8_BITS));
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L,
+					((val + ov02a10->cur_mode->height -
+					OV02A10_BASIC_LINE) &
+					OV02A10_MASK_8_BITS));
+	if (ret < 0)
+		return ret;
+
+	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
+					 REG_ENABLE);
+}
+
+static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, int pattern)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	int ret;
+
+	if (pattern)
+		pattern = OV02A10_TEST_PATTERN_ENABLE;
+
+	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_TEST_PATTERN,
+					pattern);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
+					REG_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
+					 SC_CTRL_MODE_STREAMING);
+}
+
+static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
+					       struct ov02a10, ctrl_handler);
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	s64 max_expo;
+	int ret;
+
+	/* Propagate change of current control to all related controls */
+	if (ctrl->id == V4L2_CID_VBLANK) {
+		/* Update max exposure while meeting expected vblanking */
+		max_expo = ov02a10->cur_mode->height + ctrl->val -
+			   OV02A10_EXPOSURE_MAX_MARGIN;
+		__v4l2_ctrl_modify_range(ov02a10->exposure,
+					 ov02a10->exposure->minimum, max_expo,
+					 ov02a10->exposure->step,
+					 ov02a10->exposure->default_value);
+	}
+
+	/* V4L2 controls values will be applied only when power is already up */
+	if (!pm_runtime_get_if_in_use(&client->dev))
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_EXPOSURE:
+		ret = ov02a10_set_exposure(ov02a10, ctrl->val);
+		break;
+	case V4L2_CID_ANALOGUE_GAIN:
+		ret = ov02a10_set_gain(ov02a10, ctrl->val);
+		break;
+	case V4L2_CID_VBLANK:
+		ret = ov02a10_set_vblank(ov02a10, ctrl->val);
+		break;
+	case V4L2_CID_TEST_PATTERN:
+		ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
+		break;
+	};
+
+	pm_runtime_put(&client->dev);
+
+	return ret;
+}
+
+static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
+	.s_stream = ov02a10_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
+	.init_cfg = ov02a10_entity_init_cfg,
+	.enum_mbus_code = ov02a10_enum_mbus_code,
+	.enum_frame_size = ov02a10_enum_frame_sizes,
+	.get_fmt = ov02a10_get_fmt,
+	.set_fmt = ov02a10_set_fmt,
+};
+
+static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
+	.video	= &ov02a10_video_ops,
+	.pad	= &ov02a10_pad_ops,
+};
+
+static const struct media_entity_operations ov02a10_subdev_entity_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
+	.s_ctrl = ov02a10_set_ctrl,
+};
+
+static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	const struct ov02a10_mode *mode;
+	struct v4l2_ctrl_handler *handler;
+	struct v4l2_ctrl *ctrl;
+	u64 exposure_max;
+	u32 pixel_rate, h_blank;
+	int ret;
+
+	handler = &ov02a10->ctrl_handler;
+	mode = ov02a10->cur_mode;
+	ret = v4l2_ctrl_handler_init(handler, 7);
+	if (ret)
+		return ret;
+
+	handler->lock = &ov02a10->mutex;
+
+	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
+				      0, 0, link_freq_menu_items);
+	if (ctrl)
+		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	pixel_rate = to_pixel_rate(0);
+	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
+			  0, pixel_rate, 1, pixel_rate);
+
+	h_blank = mode->hts_def - mode->width;
+	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
+					    h_blank, h_blank, 1, h_blank);
+	if (ov02a10->hblank)
+		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
+					    V4L2_CID_VBLANK, mode->vts_def -
+					    mode->height,
+					    OV02A10_VTS_MAX - mode->height, 1,
+					    mode->vts_def - mode->height);
+
+	exposure_max = mode->vts_def - 4;
+	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
+					      V4L2_CID_EXPOSURE,
+					      OV02A10_EXPOSURE_MIN,
+					      exposure_max,
+					      OV02A10_EXPOSURE_STEP,
+					      mode->exp_def);
+
+	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
+					       V4L2_CID_ANALOGUE_GAIN,
+					       OV02A10_GAIN_MIN,
+					       OV02A10_GAIN_MAX,
+					       OV02A10_GAIN_STEP,
+					       OV02A10_GAIN_DEFAULT);
+
+	ov02a10->test_pattern =
+		v4l2_ctrl_new_std_menu_items(handler,
+					     &ov02a10_ctrl_ops,
+					     V4L2_CID_TEST_PATTERN,
+					     ARRAY_SIZE(ov02a10_test_pattern_menu) -
+					     1, 0, 0,
+					     ov02a10_test_pattern_menu);
+
+	if (handler->error) {
+		ret = handler->error;
+		dev_err(&client->dev, "failed to init controls(%d)\n", ret);
+		goto err_free_handler;
+	}
+
+	ov02a10->subdev.ctrl_handler = handler;
+
+	return 0;
+
+err_free_handler:
+	v4l2_ctrl_handler_free(handler);
+
+	return ret;
+}
+
+static int ov02a10_check_hwcfg(struct device *dev)
+{
+	struct fwnode_handle *ep;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+	struct v4l2_fwnode_endpoint bus_cfg = {
+		.bus_type = V4L2_MBUS_CSI2_DPHY
+	};
+	unsigned int i, j;
+	int ret;
+
+	if (!fwnode)
+		return -ENXIO;
+
+	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
+	if (!ep)
+		return -ENXIO;
+
+	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
+	fwnode_handle_put(ep);
+	if (ret)
+		return ret;
+
+	if (!bus_cfg.nr_of_link_frequencies) {
+		dev_err(dev, "no link frequencies defined");
+		ret = -EINVAL;
+		goto check_hwcfg_error;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
+		for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
+			if (link_freq_menu_items[i] ==
+				bus_cfg.link_frequencies[j])
+				break;
+		}
+
+		if (j == bus_cfg.nr_of_link_frequencies) {
+			dev_err(dev, "no link frequency %lld supported",
+				link_freq_menu_items[i]);
+			ret = -EINVAL;
+			goto check_hwcfg_error;
+		}
+	}
+
+check_hwcfg_error:
+	v4l2_fwnode_endpoint_free(&bus_cfg);
+
+	return ret;
+}
+
+static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
+	u16 id;
+	u8 pid = 0;
+	u8 ver = 0;
+	int ret;
+
+	/* Check sensor revision */
+	ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_H, &pid);
+	if (ret)
+		return ret;
+
+	ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_L, &ver);
+	if (ret)
+		return ret;
+
+	id = OV02A10_ID(pid, ver);
+	if (id != CHIP_ID) {
+		dev_err(&client->dev, "Unexpected sensor id(%04x)\n", id);
+		return ret;
+	}
+
+	dev_info(&client->dev, "Detected OV%04X sensor\n", id);
+
+	return 0;
+}
+
+static int ov02a10_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct ov02a10 *ov02a10;
+	unsigned int rotation;
+	unsigned int i;
+	int ret;
+
+	dev_info(dev, "ov02a10 probe aaaa++\n");
+
+	ret = ov02a10_check_hwcfg(dev);
+	if (ret) {
+		dev_err(dev, "failed to check HW configuration: %d",
+			ret);
+		return ret;
+	}
+
+	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
+	if (!ov02a10)
+		return -ENOMEM;
+
+	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
+	ov02a10->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
+
+	/* Optional indication of physical rotation of sensor */
+	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
+				       &rotation);
+	if (!ret) {
+		switch (rotation) {
+		case 180:
+			ov02a10->upside_down = true;
+			ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10;
+			break;
+		case 0:
+			break;
+		default:
+			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
+				 rotation);
+		}
+	}
+
+	/* Get system clock (eclk) */
+	ov02a10->eclk = devm_clk_get(dev, "eclk");
+	if (IS_ERR(ov02a10->eclk)) {
+		dev_err(dev, "failed to get eclk\n");
+		return -EINVAL;
+	}
+
+	ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
+				       &ov02a10->eclk_freq);
+	if (ret) {
+		dev_err(dev, "failed to get eclk frequency\n");
+		return ret;
+	}
+
+	ret = clk_set_rate(ov02a10->eclk, ov02a10->eclk_freq);
+	if (ret) {
+		dev_err(dev, "failed to set eclk frequency (24MHz)\n");
+		return ret;
+	}
+
+	if (clk_get_rate(ov02a10->eclk) != OV02A10_ECLK_FREQ) {
+		dev_warn(dev, "wrong eclk frequency %d Hz, expected: %d Hz\n",
+			 ov02a10->eclk_freq, OV02A10_ECLK_FREQ);
+		return -EINVAL;
+	}
+
+	ov02a10->pd_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_HIGH);
+	if (IS_ERR(ov02a10->pd_gpio)) {
+		dev_err(dev, "failed to get powerdown-gpios\n");
+		return -EINVAL;
+	}
+
+	ov02a10->n_rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ov02a10->n_rst_gpio)) {
+		dev_err(dev, "failed to get reset-gpios\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < OV02A10_NUM_SUPPLIES; i++)
+		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
+
+	ret = devm_regulator_bulk_get(dev,
+				      OV02A10_NUM_SUPPLIES,
+				      ov02a10->supplies);
+	if (ret) {
+		dev_err(dev, "failed to get regulators\n");
+		return ret;
+	}
+
+	mutex_init(&ov02a10->mutex);
+	ov02a10->cur_mode = &supported_modes[0];
+	ret = ov02a10_initialize_controls(ov02a10);
+	if (ret) {
+		dev_err(dev, "failed to initialize controls\n");
+		goto err_destroy_mutex;
+	}
+
+	ret = __ov02a10_power_on(ov02a10);
+	if (ret)
+		goto err_free_handler;
+
+	ret = ov02a10_check_sensor_id(ov02a10);
+	if (ret)
+		goto err_power_off;
+
+	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	ov02a10->subdev.entity.ops = &ov02a10_subdev_entity_ops;
+	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
+	if (ret < 0) {
+		dev_err(dev, "failed to init entity pads: %d", ret);
+		goto err_power_off;
+	}
+
+	ret = v4l2_async_register_subdev(&ov02a10->subdev);
+	if (ret) {
+		dev_err(dev, "failed to register V4L2 subdev: %d",
+			ret);
+		goto err_clean_entity;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_idle(dev);
+
+	dev_info(dev, "ov02a10 probe --\n");
+	return 0;
+
+err_clean_entity:
+	media_entity_cleanup(&ov02a10->subdev.entity);
+err_power_off:
+	__ov02a10_power_off(ov02a10);
+err_free_handler:
+	v4l2_ctrl_handler_free(ov02a10->subdev.ctrl_handler);
+err_destroy_mutex:
+	mutex_destroy(&ov02a10->mutex);
+
+	return ret;
+}
+
+static int ov02a10_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+
+	v4l2_async_unregister_subdev(sd);
+	media_entity_cleanup(&sd->entity);
+	v4l2_ctrl_handler_free(sd->ctrl_handler);
+	pm_runtime_disable(&client->dev);
+	if (!pm_runtime_status_suspended(&client->dev))
+		__ov02a10_power_off(ov02a10);
+	pm_runtime_set_suspended(&client->dev);
+	mutex_destroy(&ov02a10->mutex);
+
+	return 0;
+}
+
+static const struct of_device_id ov02a10_of_match[] = {
+	{ .compatible = "ovti,ov02a10" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ov02a10_of_match);
+
+static struct i2c_driver ov02a10_i2c_driver = {
+	.driver = {
+		.name = "ov02a10",
+		.pm = &ov02a10_pm_ops,
+		.of_match_table = ov02a10_of_match,
+	},
+	.probe_new	= &ov02a10_probe,
+	.remove		= &ov02a10_remove,
+};
+
+module_i2c_driver(ov02a10_i2c_driver);
+
+MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
+MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
+MODULE_LICENSE("GPL v2");
+
-- 
2.9.2

Re: [V4, 2/2] media: i2c: Add Omnivision OV02A10 camera sensor driver

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 2822 bytes --]

Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linuxtv-media/master]
[cannot apply to v5.3-rc7 next-20190904]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/dongchun-zhu-mediatek-com/media-i2c-Add-support-for-OV02A10-sensor/20190908-065643
base:   git://linuxtv.org/media_tree.git master
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-11) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/media/i2c/ov02a10.c: In function 'ov02a10_set_ctrl':
>> drivers/media/i2c/ov02a10.c:699:9: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return ret;
            ^~~

vim +/ret +699 drivers/media/i2c/ov02a10.c

   658	
   659	static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
   660	{
   661		struct ov02a10 *ov02a10 = container_of(ctrl->handler,
   662						       struct ov02a10, ctrl_handler);
   663		struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
   664		s64 max_expo;
   665		int ret;
   666	
   667		/* Propagate change of current control to all related controls */
   668		if (ctrl->id == V4L2_CID_VBLANK) {
   669			/* Update max exposure while meeting expected vblanking */
   670			max_expo = ov02a10->cur_mode->height + ctrl->val -
   671				   OV02A10_EXPOSURE_MAX_MARGIN;
   672			__v4l2_ctrl_modify_range(ov02a10->exposure,
   673						 ov02a10->exposure->minimum, max_expo,
   674						 ov02a10->exposure->step,
   675						 ov02a10->exposure->default_value);
   676		}
   677	
   678		/* V4L2 controls values will be applied only when power is already up */
   679		if (!pm_runtime_get_if_in_use(&client->dev))
   680			return 0;
   681	
   682		switch (ctrl->id) {
   683		case V4L2_CID_EXPOSURE:
   684			ret = ov02a10_set_exposure(ov02a10, ctrl->val);
   685			break;
   686		case V4L2_CID_ANALOGUE_GAIN:
   687			ret = ov02a10_set_gain(ov02a10, ctrl->val);
   688			break;
   689		case V4L2_CID_VBLANK:
   690			ret = ov02a10_set_vblank(ov02a10, ctrl->val);
   691			break;
   692		case V4L2_CID_TEST_PATTERN:
   693			ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
   694			break;
   695		};
   696	
   697		pm_runtime_put(&client->dev);
   698	
 > 699		return ret;
   700	}
   701	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 69517 bytes --]

Re: [V4, 2/2] media: i2c: Add Omnivision OV02A10 camera sensor driver

[kbuild test robot]

Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linuxtv-media/master]
[cannot apply to v5.3-rc7 next-20190904]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/dongchun-zhu-mediatek-com/media-i2c-Add-support-for-OV02A10-sensor/20190908-065643
base:   git://linuxtv.org/media_tree.git master

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


coccinelle warnings: (new ones prefixed by >>)

>> drivers/media/i2c/ov02a10.c:695:2-3: Unneeded semicolon

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[PATCH] media: i2c: fix semicolon.cocci warnings

[kbuild test robot]

From: kbuild test robot <lkp@intel.com>

drivers/media/i2c/ov02a10.c:695:2-3: Unneeded semicolon


 Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

Fixes: 2bca4b808db1 ("media: i2c: Add Omnivision OV02A10 camera sensor driver")
CC: Dongchun Zhu <dongchun.zhu@mediatek.com>
Signed-off-by: kbuild test robot <lkp@intel.com>
---

url:    https://github.com/0day-ci/linux/commits/dongchun-zhu-mediatek-com/media-i2c-Add-support-for-OV02A10-sensor/20190908-065643
base:   git://linuxtv.org/media_tree.git master

 ov02a10.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/i2c/ov02a10.c
+++ b/drivers/media/i2c/ov02a10.c
@@ -692,7 +692,7 @@ static int ov02a10_set_ctrl(struct v4l2_
 	case V4L2_CID_TEST_PATTERN:
 		ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
 		break;
-	};
+	}
 
 	pm_runtime_put(&client->dev);
 

Re: [V4, 2/2] media: i2c: Add Omnivision OV02A10 camera sensor driver

[Sakari Ailus]

Hi Dongchun,

Thanks for the update. A few more comments below.

On Sat, Sep 07, 2019 at 05:27:28PM +0800, dongchun.zhu@mediatek.com wrote:
> From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> 
> This patch adds a V4L2 sub-device driver for OV02A10 image sensor.
> The OV02A10 is a 1/5" CMOS sensor from Omnivision,
> supporting output format: 10-bit Raw.
> 
> The OV02A10 has a single MIPI lane interface and use the I2C bus
> for control and the CSI-2 bus for data.
> 
> Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> ---
>  MAINTAINERS                 |    1 +
>  drivers/media/i2c/Kconfig   |   11 +
>  drivers/media/i2c/Makefile  |    1 +
>  drivers/media/i2c/ov02a10.c | 1062 +++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 1075 insertions(+)
>  create mode 100644 drivers/media/i2c/ov02a10.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 41734fb..4b714a2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11821,6 +11821,7 @@ M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
>  L:	linux-media@vger.kernel.org
>  T:	git git://linuxtv.org/media_tree.git
>  S:	Maintained
> +F:	drivers/media/i2c/ov02a10.c
>  F:	Documentation/devicetree/bindings/media/i2c/ov02a10.txt
>  
>  OMNIVISION OV2680 SENSOR DRIVER
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 79ce9ec..22e0db4 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -617,6 +617,17 @@ config VIDEO_IMX355
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called imx355.
>  
> +config VIDEO_OV02A10
> +	tristate "OmniVision OV02A10 sensor support"
> +	depends on VIDEO_V4L2 && I2C
> +	depends on MEDIA_CAMERA_SUPPORT

Please add VIDEO_V4L2_SUBDEV_API

> +	help
> +	  This is a Video4Linux2 sensor driver for the OmniVision
> +	  OV02A10 camera.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called ov02a10.
> +
>  config VIDEO_OV2640
>  	tristate "OmniVision OV2640 sensor support"
>  	depends on VIDEO_V4L2 && I2C
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index fd4ea86..d27f4e2 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
>  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
>  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
>  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
>  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
>  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
>  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> new file mode 100644
> index 0000000..fb677d5
> --- /dev/null
> +++ b/drivers/media/i2c/ov02a10.c
> @@ -0,0 +1,1062 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2019 MediaTek Inc.
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/v4l2-fwnode.h>
> +
> +#define CHIP_ID						0x2509
> +#define OV02A10_REG_CHIP_ID_H				0x02
> +#define OV02A10_REG_CHIP_ID_L				0x03
> +#define OV02A10_ID(_msb, _lsb)				((_msb) << 8 | (_lsb))
> +
> +/* Bit[1] vertical upside down */
> +/* Bit[0] horizontal mirror */
> +#define REG_MIRROR_FLIP_CONTROL				0x3f
> +
> +/* Orientation */
> +#define REG_MIRROR_FLIP_ENABLE				0x03
> +
> +#define REG_PAGE_SWITCH					0xfd
> +#define REG_GLOBAL_EFFECTIVE				0x01
> +#define REG_ENABLE					BIT(0)
> +#define OV02A10_MASK_8_BITS				0xff
> +
> +#define REG_SC_CTRL_MODE				0xac
> +#define SC_CTRL_MODE_STANDBY				0x00
> +#define SC_CTRL_MODE_STREAMING				0x01
> +
> +#define OV02A10_EXP_SHIFT				8
> +#define OV02A10_REG_EXPOSURE_H				0x03
> +#define OV02A10_REG_EXPOSURE_L				0x04
> +#define	OV02A10_EXPOSURE_MIN				4
> +#define OV02A10_EXPOSURE_MAX_MARGIN			4
> +#define	OV02A10_EXPOSURE_STEP				1
> +
> +#define OV02A10_VTS_SHIFT				8
> +#define OV02A10_REG_VTS_H				0x05
> +#define OV02A10_REG_VTS_L				0x06
> +#define OV02A10_VTS_MAX					0x209f
> +#define OV02A10_VTS_MIN					0x04cf
> +#define OV02A10_BASIC_LINE				1224
> +
> +#define OV02A10_REG_GAIN				0x24
> +#define OV02A10_GAIN_MIN				0x10
> +#define OV02A10_GAIN_MAX				0xf8
> +#define OV02A10_GAIN_STEP				0x01
> +#define OV02A10_GAIN_DEFAULT				0x40
> +
> +/* Test pattern control */
> +#define OV02A10_REG_TEST_PATTERN			0xb6
> +#define OV02A10_TEST_PATTERN_ENABLE			BIT(0)
> +
> +#define OV02A10_LINK_FREQ_390MHZ			390000000ULL
> +#define OV02A10_ECLK_FREQ				24000000
> +#define OV02A10_DATA_LANES				1
> +#define OV02A10_BITS_PER_SAMPLE				10
> +
> +static const char * const ov02a10_supply_names[] = {
> +	"dovdd",	/* Digital I/O power */
> +	"avdd",		/* Analog power */
> +	"dvdd",		/* Digital core power */
> +};
> +
> +#define OV02A10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> +
> +struct ov02a10_reg {
> +	u8 addr;
> +	u8 val;
> +};
> +
> +struct ov02a10_reg_list {
> +	u32 num_of_regs;
> +	const struct ov02a10_reg *regs;
> +};
> +
> +struct ov02a10_mode {
> +	u32 width;
> +	u32 height;
> +	u32 exp_def;
> +	u32 hts_def;
> +	u32 vts_def;
> +	const struct ov02a10_reg_list reg_list;
> +};
> +
> +struct ov02a10 {
> +	struct clk		*eclk;
> +	u32 eclk_freq;
> +
> +	struct gpio_desc	*pd_gpio;
> +	struct gpio_desc	*n_rst_gpio;
> +	struct regulator_bulk_data supplies[OV02A10_NUM_SUPPLIES];
> +
> +	bool			streaming;
> +	bool			upside_down;
> +
> +	/*
> +	 * Serialize control access, get/set format, get selection
> +	 * and start streaming.
> +	 */
> +	struct mutex		mutex;
> +	struct v4l2_subdev	subdev;
> +	struct media_pad	pad;
> +	struct v4l2_ctrl	*anal_gain;
> +	struct v4l2_ctrl	*exposure;
> +	struct v4l2_ctrl	*hblank;
> +	struct v4l2_ctrl	*vblank;
> +	struct v4l2_ctrl	*hflip;
> +	struct v4l2_ctrl	*vflip;
> +	struct v4l2_ctrl	*test_pattern;

Of the above references to controls, only exposure appears to be actually
used. Please drop the others.

> +	struct v4l2_mbus_framefmt	fmt;
> +	struct v4l2_ctrl_handler ctrl_handler;
> +
> +	const struct ov02a10_mode *cur_mode;
> +};
> +
> +static inline struct ov02a10 *to_ov02a10(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct ov02a10, subdev);
> +}
> +
> +/*
> + * eclk 24Mhz
> + * pclk 39Mhz
> + * linelength 934(0x3a6)
> + * framelength 1390(0x56E)
> + * grabwindow_width 1600
> + * grabwindow_height 1200
> + * max_framerate 30fps
> + * mipi_datarate per lane 780Mbps
> + */
> +static const struct ov02a10_reg ov02a10_1600x1200_regs[] = {
> +	{0xfd, 0x01},
> +	{0xac, 0x00},
> +	{0xfd, 0x00},
> +	{0x2f, 0x29},
> +	{0x34, 0x00},
> +	{0x35, 0x21},
> +	{0x30, 0x15},
> +	{0x33, 0x01},
> +	{0xfd, 0x01},
> +	{0x44, 0x00},
> +	{0x2a, 0x4c},
> +	{0x2b, 0x1e},
> +	{0x2c, 0x60},
> +	{0x25, 0x11},
> +	{0x03, 0x01},
> +	{0x04, 0xae},
> +	{0x09, 0x00},
> +	{0x0a, 0x02},
> +	{0x06, 0xa6},
> +	{0x31, 0x00},
> +	{0x24, 0x40},
> +	{0x01, 0x01},
> +	{0xfb, 0x73},
> +	{0xfd, 0x01},
> +	{0x16, 0x04},
> +	{0x1c, 0x09},
> +	{0x21, 0x42},
> +	{0x12, 0x04},
> +	{0x13, 0x10},
> +	{0x11, 0x40},
> +	{0x33, 0x81},
> +	{0xd0, 0x00},
> +	{0xd1, 0x01},
> +	{0xd2, 0x00},
> +	{0x50, 0x10},
> +	{0x51, 0x23},
> +	{0x52, 0x20},
> +	{0x53, 0x10},
> +	{0x54, 0x02},
> +	{0x55, 0x20},
> +	{0x56, 0x02},
> +	{0x58, 0x48},
> +	{0x5d, 0x15},
> +	{0x5e, 0x05},
> +	{0x66, 0x66},
> +	{0x68, 0x68},
> +	{0x6b, 0x00},
> +	{0x6c, 0x00},
> +	{0x6f, 0x40},
> +	{0x70, 0x40},
> +	{0x71, 0x0a},
> +	{0x72, 0xf0},
> +	{0x73, 0x10},
> +	{0x75, 0x80},
> +	{0x76, 0x10},
> +	{0x84, 0x00},
> +	{0x85, 0x10},
> +	{0x86, 0x10},
> +	{0x87, 0x00},
> +	{0x8a, 0x22},
> +	{0x8b, 0x22},
> +	{0x19, 0xf1},
> +	{0x29, 0x01},
> +	{0xfd, 0x01},
> +	{0x9d, 0xd6},
> +	{0xa0, 0x29},
> +	{0xa1, 0x03},
> +	{0xad, 0x62},
> +	{0xae, 0x00},
> +	{0xaf, 0x85},
> +	{0xb1, 0x01},
> +	{0x8e, 0x06},
> +	{0x8f, 0x40},
> +	{0x90, 0x04},
> +	{0x91, 0xb0},
> +	{0x45, 0x01},
> +	{0x46, 0x00},
> +	{0x47, 0x6c},
> +	{0x48, 0x03},
> +	{0x49, 0x8b},
> +	{0x4a, 0x00},
> +	{0x4b, 0x07},
> +	{0x4c, 0x04},
> +	{0x4d, 0xb7},
> +	{0xf0, 0x40},
> +	{0xf1, 0x40},
> +	{0xf2, 0x40},
> +	{0xf3, 0x40},
> +	{0x3f, 0x00},
> +	{0xfd, 0x01},
> +	{0x05, 0x00},
> +	{0x06, 0xa6},
> +	{0xfd, 0x01},
> +};
> +
> +static const char * const ov02a10_test_pattern_menu[] = {
> +	"Disabled",
> +	"Color Bar",
> +};
> +
> +static const s64 link_freq_menu_items[] = {
> +	OV02A10_LINK_FREQ_390MHZ
> +};
> +
> +static u64 to_pixel_rate(u32 f_index)
> +{
> +	u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV02A10_DATA_LANES;
> +
> +	do_div(pixel_rate, OV02A10_BITS_PER_SAMPLE);
> +
> +	return pixel_rate;
> +}
> +
> +static const struct ov02a10_mode supported_modes[] = {
> +	{
> +		.width = 1600,
> +		.height = 1200,
> +		.exp_def = 0x01ae,
> +		.hts_def = 0x03a6,
> +		.vts_def = 0x056e,
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(ov02a10_1600x1200_regs),
> +			.regs = ov02a10_1600x1200_regs,
> +		},
> +	},
> +};
> +
> +static int ov02a10_write_array(struct ov02a10 *ov02a10,
> +			       const struct ov02a10_reg_list *r_list)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < r_list->num_of_regs; i++) {
> +		ret = i2c_smbus_write_byte_data(client,
> +						r_list->regs[i].addr,
> +						r_list->regs[i].val);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ov02a10_read_smbus(struct ov02a10 *ov02a10, unsigned char reg,
> +			      unsigned char *val)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	int ret;
> +
> +	ret = i2c_smbus_read_byte_data(client, reg);
> +	if (ret >= 0) {
> +		*val = (unsigned char)ret;
> +		ret = 0;
> +	}
> +
> +	return ret;
> +}
> +
> +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> +			     struct v4l2_mbus_framefmt *fmt)
> +{
> +	fmt->width = mode->width;
> +	fmt->height = mode->height;
> +	fmt->field = V4L2_FIELD_NONE;
> +}
> +
> +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_format *fmt)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +	mutex_lock(&ov02a10->mutex);
> +
> +	if (ov02a10->streaming) {
> +		mutex_unlock(&ov02a10->mutex);
> +		return -EBUSY;
> +	}
> +
> +	/* Only one sensor mode supported */
> +	mbus_fmt->code = ov02a10->fmt.code;
> +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +	ov02a10->fmt = fmt->format;
> +
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_format *fmt)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +	mutex_lock(&ov02a10->mutex);
> +
> +	fmt->format = ov02a10->fmt;
> +	mbus_fmt->code = ov02a10->fmt.code;
> +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	if (code->index >= ARRAY_SIZE(supported_modes))
> +		return -EINVAL;
> +
> +	code->code = ov02a10->fmt.code;
> +
> +	return 0;
> +}
> +
> +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> +				    struct v4l2_subdev_pad_config *cfg,
> +				    struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	if (fse->index >= ARRAY_SIZE(supported_modes))
> +		return -EINVAL;
> +
> +	fse->min_width  = supported_modes[fse->index].width;
> +	fse->max_width  = supported_modes[fse->index].width;
> +	fse->max_height = supported_modes[fse->index].height;
> +	fse->min_height = supported_modes[fse->index].height;
> +
> +	return 0;
> +}
> +
> +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	struct device *dev = &client->dev;
> +	int ret;
> +
> +	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, GPIOD_OUT_LOW);
> +	gpiod_set_value_cansleep(ov02a10->pd_gpio, GPIOD_OUT_HIGH);
> +
> +	ret = clk_prepare_enable(ov02a10->eclk);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to enable eclk\n");
> +		return ret;
> +	}
> +
> +	ret = regulator_bulk_enable(OV02A10_NUM_SUPPLIES, ov02a10->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to enable regulators\n");
> +		goto disable_clk;
> +	}
> +	usleep_range(5000, 6000);
> +
> +	gpiod_set_value_cansleep(ov02a10->pd_gpio, GPIOD_OUT_LOW);
> +	usleep_range(5000, 6000);
> +
> +	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, GPIOD_OUT_HIGH);
> +	usleep_range(5000, 6000);
> +
> +	return 0;
> +
> +disable_clk:
> +	clk_disable_unprepare(ov02a10->eclk);
> +
> +	return ret;
> +}
> +
> +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> +{
> +	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, 1);
> +	clk_disable_unprepare(ov02a10->eclk);
> +	gpiod_set_value_cansleep(ov02a10->pd_gpio, 1);
> +	regulator_bulk_disable(OV02A10_NUM_SUPPLIES, ov02a10->supplies);
> +}
> +
> +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	const struct ov02a10_reg_list *reg_list;
> +	int ret;
> +
> +	/* Apply default values of current mode */
> +	reg_list = &ov02a10->cur_mode->reg_list;
> +	ret = ov02a10_write_array(ov02a10, reg_list);
> +	if (ret)
> +		return ret;
> +
> +	/* Apply customized values from user */
> +	ret = __v4l2_ctrl_handler_setup(ov02a10->subdev.ctrl_handler);
> +	if (ret)
> +		return ret;
> +
> +	/* Set orientation to 180 degree */
> +	if (ov02a10->upside_down) {
> +		ret = i2c_smbus_write_byte_data(client, REG_MIRROR_FLIP_CONTROL,
> +						REG_MIRROR_FLIP_ENABLE);
> +		if (ret) {
> +			dev_err(&client->dev, "failed to set orientation\n");
> +			return ret;
> +		}
> +		ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> +						REG_ENABLE);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	/* Set stream on register */
> +	return i2c_smbus_write_byte_data(client,
> +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> +}
> +
> +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +
> +	return i2c_smbus_write_byte_data(client,
> +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);

Indentation.

> +}
> +
> +static int ov02a10_entity_init_cfg(struct v4l2_subdev *sd,
> +				   struct v4l2_subdev_pad_config *cfg)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_subdev_format fmt = { 0 };
> +
> +	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
> +	fmt.format.width = ov02a10->cur_mode->width;
> +	fmt.format.height = ov02a10->cur_mode->width;
> +
> +	ov02a10_set_fmt(sd, cfg, &fmt);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	int ret = 0;
> +
> +	dev_dbg(&client->dev, "ov02a10 s_stream (%d)\n", on);
> +	mutex_lock(&ov02a10->mutex);
> +
> +	if (ov02a10->streaming == on)
> +		goto unlock_and_return;
> +
> +	if (on) {
> +		ret = pm_runtime_get_sync(&client->dev);
> +		if (ret < 0) {
> +			pm_runtime_put_noidle(&client->dev);
> +			goto unlock_and_return;
> +		}
> +
> +		ret = __ov02a10_start_stream(ov02a10);
> +		if (ret) {
> +			__ov02a10_stop_stream(ov02a10);
> +			ov02a10->streaming = !on;
> +			goto err_rpm_put;
> +		}
> +	} else {
> +		__ov02a10_stop_stream(ov02a10);
> +		pm_runtime_put(&client->dev);
> +	}
> +
> +	ov02a10->streaming = on;
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return ret;
> +
> +err_rpm_put:
> +	pm_runtime_put(&client->dev);
> +unlock_and_return:
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return ret;
> +}
> +
> +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	return __ov02a10_power_on(ov02a10);
> +}
> +
> +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	__ov02a10_power_off(ov02a10);
> +
> +	return 0;
> +}

Please move the content of the both functions here; you don't need another
pair with just different arguments.

> +
> +static const struct dev_pm_ops ov02a10_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +				pm_runtime_force_resume)
> +	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> +			   ov02a10_runtime_resume, NULL)
> +};
> +
> +/*
> + * ov02a10_set_exposure - Function called when setting exposure time
> + * @priv: Pointer to device structure
> + * @val: Variable for exposure time, in the unit of micro-second
> + *
> + * Set exposure time based on input value.
> + *
> + * Return: 0 on success
> + */
> +static int ov02a10_set_exposure(struct ov02a10 *ov02a10, int val)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	int ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_H,
> +					((val >> OV02A10_EXP_SHIFT) &
> +					OV02A10_MASK_8_BITS));
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_L,
> +					(val & OV02A10_MASK_8_BITS));
> +	if (ret < 0)
> +		return ret;
> +
> +	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> +					 REG_ENABLE);
> +}
> +
> +static int ov02a10_set_gain(struct ov02a10 *ov02a10, int val)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	int ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_GAIN,
> +					(val & OV02A10_MASK_8_BITS));
> +	if (ret < 0)
> +		return ret;
> +
> +	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> +					 REG_ENABLE);
> +}
> +
> +static int ov02a10_set_vblank(struct ov02a10 *ov02a10, int val)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	int ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H,
> +					(((val + ov02a10->cur_mode->height -
> +					OV02A10_BASIC_LINE) >>
> +					OV02A10_VTS_SHIFT) &
> +					OV02A10_MASK_8_BITS));
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L,
> +					((val + ov02a10->cur_mode->height -
> +					OV02A10_BASIC_LINE) &
> +					OV02A10_MASK_8_BITS));
> +	if (ret < 0)
> +		return ret;
> +
> +	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> +					 REG_ENABLE);
> +}
> +
> +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, int pattern)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	int ret;
> +
> +	if (pattern)
> +		pattern = OV02A10_TEST_PATTERN_ENABLE;
> +
> +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_TEST_PATTERN,
> +					pattern);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> +					REG_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
> +					 SC_CTRL_MODE_STREAMING);
> +}
> +
> +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> +					       struct ov02a10, ctrl_handler);
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	s64 max_expo;
> +	int ret;
> +
> +	/* Propagate change of current control to all related controls */
> +	if (ctrl->id == V4L2_CID_VBLANK) {
> +		/* Update max exposure while meeting expected vblanking */
> +		max_expo = ov02a10->cur_mode->height + ctrl->val -
> +			   OV02A10_EXPOSURE_MAX_MARGIN;
> +		__v4l2_ctrl_modify_range(ov02a10->exposure,
> +					 ov02a10->exposure->minimum, max_expo,
> +					 ov02a10->exposure->step,
> +					 ov02a10->exposure->default_value);
> +	}
> +
> +	/* V4L2 controls values will be applied only when power is already up */
> +	if (!pm_runtime_get_if_in_use(&client->dev))
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_EXPOSURE:
> +		ret = ov02a10_set_exposure(ov02a10, ctrl->val);
> +		break;
> +	case V4L2_CID_ANALOGUE_GAIN:
> +		ret = ov02a10_set_gain(ov02a10, ctrl->val);
> +		break;
> +	case V4L2_CID_VBLANK:
> +		ret = ov02a10_set_vblank(ov02a10, ctrl->val);
> +		break;
> +	case V4L2_CID_TEST_PATTERN:
> +		ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
> +		break;
> +	};
> +
> +	pm_runtime_put(&client->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> +	.s_stream = ov02a10_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> +	.init_cfg = ov02a10_entity_init_cfg,
> +	.enum_mbus_code = ov02a10_enum_mbus_code,
> +	.enum_frame_size = ov02a10_enum_frame_sizes,
> +	.get_fmt = ov02a10_get_fmt,
> +	.set_fmt = ov02a10_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> +	.video	= &ov02a10_video_ops,
> +	.pad	= &ov02a10_pad_ops,
> +};
> +
> +static const struct media_entity_operations ov02a10_subdev_entity_ops = {
> +	.link_validate = v4l2_subdev_link_validate,
> +};
> +
> +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> +	.s_ctrl = ov02a10_set_ctrl,
> +};
> +
> +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	const struct ov02a10_mode *mode;
> +	struct v4l2_ctrl_handler *handler;
> +	struct v4l2_ctrl *ctrl;
> +	u64 exposure_max;
> +	u32 pixel_rate, h_blank;
> +	int ret;
> +
> +	handler = &ov02a10->ctrl_handler;
> +	mode = ov02a10->cur_mode;
> +	ret = v4l2_ctrl_handler_init(handler, 7);
> +	if (ret)
> +		return ret;
> +
> +	handler->lock = &ov02a10->mutex;
> +
> +	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> +				      0, 0, link_freq_menu_items);
> +	if (ctrl)
> +		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	pixel_rate = to_pixel_rate(0);
> +	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> +			  0, pixel_rate, 1, pixel_rate);
> +
> +	h_blank = mode->hts_def - mode->width;
> +	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> +					    h_blank, h_blank, 1, h_blank);
> +	if (ov02a10->hblank)
> +		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					    V4L2_CID_VBLANK, mode->vts_def -
> +					    mode->height,
> +					    OV02A10_VTS_MAX - mode->height, 1,
> +					    mode->vts_def - mode->height);
> +
> +	exposure_max = mode->vts_def - 4;
> +	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					      V4L2_CID_EXPOSURE,
> +					      OV02A10_EXPOSURE_MIN,
> +					      exposure_max,
> +					      OV02A10_EXPOSURE_STEP,
> +					      mode->exp_def);
> +
> +	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					       V4L2_CID_ANALOGUE_GAIN,
> +					       OV02A10_GAIN_MIN,
> +					       OV02A10_GAIN_MAX,
> +					       OV02A10_GAIN_STEP,
> +					       OV02A10_GAIN_DEFAULT);
> +
> +	ov02a10->test_pattern =
> +		v4l2_ctrl_new_std_menu_items(handler,
> +					     &ov02a10_ctrl_ops,
> +					     V4L2_CID_TEST_PATTERN,
> +					     ARRAY_SIZE(ov02a10_test_pattern_menu) -
> +					     1, 0, 0,
> +					     ov02a10_test_pattern_menu);
> +
> +	if (handler->error) {
> +		ret = handler->error;
> +		dev_err(&client->dev, "failed to init controls(%d)\n", ret);
> +		goto err_free_handler;
> +	}
> +
> +	ov02a10->subdev.ctrl_handler = handler;
> +
> +	return 0;
> +
> +err_free_handler:
> +	v4l2_ctrl_handler_free(handler);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_check_hwcfg(struct device *dev)
> +{
> +	struct fwnode_handle *ep;
> +	struct fwnode_handle *fwnode = dev_fwnode(dev);
> +	struct v4l2_fwnode_endpoint bus_cfg = {
> +		.bus_type = V4L2_MBUS_CSI2_DPHY
> +	};
> +	unsigned int i, j;
> +	int ret;
> +
> +	if (!fwnode)
> +		return -ENXIO;
> +
> +	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
> +	if (!ep)
> +		return -ENXIO;
> +
> +	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> +	fwnode_handle_put(ep);
> +	if (ret)
> +		return ret;
> +
> +	if (!bus_cfg.nr_of_link_frequencies) {
> +		dev_err(dev, "no link frequencies defined");
> +		ret = -EINVAL;
> +		goto check_hwcfg_error;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
> +		for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
> +			if (link_freq_menu_items[i] ==
> +				bus_cfg.link_frequencies[j])
> +				break;
> +		}
> +
> +		if (j == bus_cfg.nr_of_link_frequencies) {
> +			dev_err(dev, "no link frequency %lld supported",
> +				link_freq_menu_items[i]);
> +			ret = -EINVAL;
> +			goto check_hwcfg_error;
> +		}
> +	}
> +
> +check_hwcfg_error:
> +	v4l2_fwnode_endpoint_free(&bus_cfg);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +	u16 id;
> +	u8 pid = 0;
> +	u8 ver = 0;
> +	int ret;
> +
> +	/* Check sensor revision */
> +	ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_H, &pid);
> +	if (ret)
> +		return ret;
> +
> +	ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_L, &ver);
> +	if (ret)
> +		return ret;
> +
> +	id = OV02A10_ID(pid, ver);
> +	if (id != CHIP_ID) {
> +		dev_err(&client->dev, "Unexpected sensor id(%04x)\n", id);
> +		return ret;
> +	}
> +
> +	dev_info(&client->dev, "Detected OV%04X sensor\n", id);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct ov02a10 *ov02a10;
> +	unsigned int rotation;
> +	unsigned int i;
> +	int ret;
> +
> +	dev_info(dev, "ov02a10 probe aaaa++\n");

Please remove.

> +
> +	ret = ov02a10_check_hwcfg(dev);
> +	if (ret) {
> +		dev_err(dev, "failed to check HW configuration: %d",
> +			ret);
> +		return ret;
> +	}
> +
> +	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> +	if (!ov02a10)
> +		return -ENOMEM;
> +
> +	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> +	ov02a10->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> +	/* Optional indication of physical rotation of sensor */
> +	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> +				       &rotation);
> +	if (!ret) {
> +		switch (rotation) {
> +		case 180:
> +			ov02a10->upside_down = true;
> +			ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10;
> +			break;
> +		case 0:
> +			break;
> +		default:
> +			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> +				 rotation);
> +		}
> +	}
> +
> +	/* Get system clock (eclk) */
> +	ov02a10->eclk = devm_clk_get(dev, "eclk");
> +	if (IS_ERR(ov02a10->eclk)) {
> +		dev_err(dev, "failed to get eclk\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
> +				       &ov02a10->eclk_freq);
> +	if (ret) {
> +		dev_err(dev, "failed to get eclk frequency\n");
> +		return ret;
> +	}
> +
> +	ret = clk_set_rate(ov02a10->eclk, ov02a10->eclk_freq);
> +	if (ret) {
> +		dev_err(dev, "failed to set eclk frequency (24MHz)\n");
> +		return ret;
> +	}
> +
> +	if (clk_get_rate(ov02a10->eclk) != OV02A10_ECLK_FREQ) {
> +		dev_warn(dev, "wrong eclk frequency %d Hz, expected: %d Hz\n",
> +			 ov02a10->eclk_freq, OV02A10_ECLK_FREQ);
> +		return -EINVAL;
> +	}
> +
> +	ov02a10->pd_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ov02a10->pd_gpio)) {
> +		dev_err(dev, "failed to get powerdown-gpios\n");
> +		return -EINVAL;
> +	}
> +
> +	ov02a10->n_rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ov02a10->n_rst_gpio)) {
> +		dev_err(dev, "failed to get reset-gpios\n");
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < OV02A10_NUM_SUPPLIES; i++)
> +		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> +
> +	ret = devm_regulator_bulk_get(dev,
> +				      OV02A10_NUM_SUPPLIES,

Fits on a single line.

> +				      ov02a10->supplies);
> +	if (ret) {
> +		dev_err(dev, "failed to get regulators\n");
> +		return ret;
> +	}
> +
> +	mutex_init(&ov02a10->mutex);
> +	ov02a10->cur_mode = &supported_modes[0];
> +	ret = ov02a10_initialize_controls(ov02a10);
> +	if (ret) {
> +		dev_err(dev, "failed to initialize controls\n");
> +		goto err_destroy_mutex;
> +	}
> +
> +	ret = __ov02a10_power_on(ov02a10);
> +	if (ret)
> +		goto err_free_handler;
> +
> +	ret = ov02a10_check_sensor_id(ov02a10);
> +	if (ret)
> +		goto err_power_off;
> +
> +	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	ov02a10->subdev.entity.ops = &ov02a10_subdev_entity_ops;
> +	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to init entity pads: %d", ret);
> +		goto err_power_off;
> +	}
> +
> +	ret = v4l2_async_register_subdev(&ov02a10->subdev);
> +	if (ret) {
> +		dev_err(dev, "failed to register V4L2 subdev: %d",
> +			ret);
> +		goto err_clean_entity;
> +	}
> +
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +	pm_runtime_idle(dev);
> +
> +	dev_info(dev, "ov02a10 probe --\n");

Ditto.

> +	return 0;
> +
> +err_clean_entity:
> +	media_entity_cleanup(&ov02a10->subdev.entity);
> +err_power_off:
> +	__ov02a10_power_off(ov02a10);
> +err_free_handler:
> +	v4l2_ctrl_handler_free(ov02a10->subdev.ctrl_handler);
> +err_destroy_mutex:
> +	mutex_destroy(&ov02a10->mutex);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	v4l2_async_unregister_subdev(sd);
> +	media_entity_cleanup(&sd->entity);
> +	v4l2_ctrl_handler_free(sd->ctrl_handler);
> +	pm_runtime_disable(&client->dev);
> +	if (!pm_runtime_status_suspended(&client->dev))
> +		__ov02a10_power_off(ov02a10);
> +	pm_runtime_set_suspended(&client->dev);
> +	mutex_destroy(&ov02a10->mutex);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id ov02a10_of_match[] = {
> +	{ .compatible = "ovti,ov02a10" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> +
> +static struct i2c_driver ov02a10_i2c_driver = {
> +	.driver = {
> +		.name = "ov02a10",
> +		.pm = &ov02a10_pm_ops,
> +		.of_match_table = ov02a10_of_match,
> +	},
> +	.probe_new	= &ov02a10_probe,
> +	.remove		= &ov02a10_remove,
> +};
> +
> +module_i2c_driver(ov02a10_i2c_driver);
> +
> +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> +MODULE_LICENSE("GPL v2");
> +

-- 
Sakari Ailus
sakari.ailus@linux.intel.com

Re: [V4, 2/2] media: i2c: Add Omnivision OV02A10 camera sensor driver

[Dongchun Zhu]

Hello Sakari,

On Mon, 2019-09-09 at 09:55 +0300, Sakari Ailus wrote:
> Hi Dongchun,
> 
> Thanks for the update. A few more comments below.
> 
> On Sat, Sep 07, 2019 at 05:27:28PM +0800, dongchun.zhu@mediatek.com wrote:
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > 
> > This patch adds a V4L2 sub-device driver for OV02A10 image sensor.
> > The OV02A10 is a 1/5" CMOS sensor from Omnivision,
> > supporting output format: 10-bit Raw.
> > 
> > The OV02A10 has a single MIPI lane interface and use the I2C bus
> > for control and the CSI-2 bus for data.
> > 
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > ---
> >  MAINTAINERS                 |    1 +
> >  drivers/media/i2c/Kconfig   |   11 +
> >  drivers/media/i2c/Makefile  |    1 +
> >  drivers/media/i2c/ov02a10.c | 1062 +++++++++++++++++++++++++++++++++++++++++++
> >  4 files changed, 1075 insertions(+)
> >  create mode 100644 drivers/media/i2c/ov02a10.c
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 41734fb..4b714a2 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -11821,6 +11821,7 @@ M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
> >  L:	linux-media@vger.kernel.org
> >  T:	git git://linuxtv.org/media_tree.git
> >  S:	Maintained
> > +F:	drivers/media/i2c/ov02a10.c
> >  F:	Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> >  
> >  OMNIVISION OV2680 SENSOR DRIVER
> > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > index 79ce9ec..22e0db4 100644
> > --- a/drivers/media/i2c/Kconfig
> > +++ b/drivers/media/i2c/Kconfig
> > @@ -617,6 +617,17 @@ config VIDEO_IMX355
> >  	  To compile this driver as a module, choose M here: the
> >  	  module will be called imx355.
> >  
> > +config VIDEO_OV02A10
> > +	tristate "OmniVision OV02A10 sensor support"
> > +	depends on VIDEO_V4L2 && I2C
> > +	depends on MEDIA_CAMERA_SUPPORT
> 
> Please add VIDEO_V4L2_SUBDEV_API
> 

Fixed in next release.

> > +	help
> > +	  This is a Video4Linux2 sensor driver for the OmniVision
> > +	  OV02A10 camera.
> > +
> > +	  To compile this driver as a module, choose M here: the
> > +	  module will be called ov02a10.
> > +
> >  config VIDEO_OV2640
> >  	tristate "OmniVision OV2640 sensor support"
> >  	depends on VIDEO_V4L2 && I2C
> > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > index fd4ea86..d27f4e2 100644
> > --- a/drivers/media/i2c/Makefile
> > +++ b/drivers/media/i2c/Makefile
> > @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
> >  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
> >  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
> >  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> > +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
> >  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
> >  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
> >  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> > diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> > new file mode 100644
> > index 0000000..fb677d5
> > --- /dev/null
> > +++ b/drivers/media/i2c/ov02a10.c
> > @@ -0,0 +1,1062 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +// Copyright (c) 2019 MediaTek Inc.
> > +
> > +#include <linux/clk.h>
> > +#include <linux/device.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <media/media-entity.h>
> > +#include <media/v4l2-async.h>
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-subdev.h>
> > +#include <media/v4l2-fwnode.h>
> > +
> > +#define CHIP_ID						0x2509
> > +#define OV02A10_REG_CHIP_ID_H				0x02
> > +#define OV02A10_REG_CHIP_ID_L				0x03
> > +#define OV02A10_ID(_msb, _lsb)				((_msb) << 8 | (_lsb))
> > +
> > +/* Bit[1] vertical upside down */
> > +/* Bit[0] horizontal mirror */
> > +#define REG_MIRROR_FLIP_CONTROL				0x3f
> > +
> > +/* Orientation */
> > +#define REG_MIRROR_FLIP_ENABLE				0x03
> > +
> > +#define REG_PAGE_SWITCH					0xfd
> > +#define REG_GLOBAL_EFFECTIVE				0x01
> > +#define REG_ENABLE					BIT(0)
> > +#define OV02A10_MASK_8_BITS				0xff
> > +
> > +#define REG_SC_CTRL_MODE				0xac
> > +#define SC_CTRL_MODE_STANDBY				0x00
> > +#define SC_CTRL_MODE_STREAMING				0x01
> > +
> > +#define OV02A10_EXP_SHIFT				8
> > +#define OV02A10_REG_EXPOSURE_H				0x03
> > +#define OV02A10_REG_EXPOSURE_L				0x04
> > +#define	OV02A10_EXPOSURE_MIN				4
> > +#define OV02A10_EXPOSURE_MAX_MARGIN			4
> > +#define	OV02A10_EXPOSURE_STEP				1
> > +
> > +#define OV02A10_VTS_SHIFT				8
> > +#define OV02A10_REG_VTS_H				0x05
> > +#define OV02A10_REG_VTS_L				0x06
> > +#define OV02A10_VTS_MAX					0x209f
> > +#define OV02A10_VTS_MIN					0x04cf
> > +#define OV02A10_BASIC_LINE				1224
> > +
> > +#define OV02A10_REG_GAIN				0x24
> > +#define OV02A10_GAIN_MIN				0x10
> > +#define OV02A10_GAIN_MAX				0xf8
> > +#define OV02A10_GAIN_STEP				0x01
> > +#define OV02A10_GAIN_DEFAULT				0x40
> > +
> > +/* Test pattern control */
> > +#define OV02A10_REG_TEST_PATTERN			0xb6
> > +#define OV02A10_TEST_PATTERN_ENABLE			BIT(0)
> > +
> > +#define OV02A10_LINK_FREQ_390MHZ			390000000ULL
> > +#define OV02A10_ECLK_FREQ				24000000
> > +#define OV02A10_DATA_LANES				1
> > +#define OV02A10_BITS_PER_SAMPLE				10
> > +
> > +static const char * const ov02a10_supply_names[] = {
> > +	"dovdd",	/* Digital I/O power */
> > +	"avdd",		/* Analog power */
> > +	"dvdd",		/* Digital core power */
> > +};
> > +
> > +#define OV02A10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> > +
> > +struct ov02a10_reg {
> > +	u8 addr;
> > +	u8 val;
> > +};
> > +
> > +struct ov02a10_reg_list {
> > +	u32 num_of_regs;
> > +	const struct ov02a10_reg *regs;
> > +};
> > +
> > +struct ov02a10_mode {
> > +	u32 width;
> > +	u32 height;
> > +	u32 exp_def;
> > +	u32 hts_def;
> > +	u32 vts_def;
> > +	const struct ov02a10_reg_list reg_list;
> > +};
> > +
> > +struct ov02a10 {
> > +	struct clk		*eclk;
> > +	u32 eclk_freq;
> > +
> > +	struct gpio_desc	*pd_gpio;
> > +	struct gpio_desc	*n_rst_gpio;
> > +	struct regulator_bulk_data supplies[OV02A10_NUM_SUPPLIES];
> > +
> > +	bool			streaming;
> > +	bool			upside_down;
> > +
> > +	/*
> > +	 * Serialize control access, get/set format, get selection
> > +	 * and start streaming.
> > +	 */
> > +	struct mutex		mutex;
> > +	struct v4l2_subdev	subdev;
> > +	struct media_pad	pad;
> > +	struct v4l2_ctrl	*anal_gain;
> > +	struct v4l2_ctrl	*exposure;
> > +	struct v4l2_ctrl	*hblank;
> > +	struct v4l2_ctrl	*vblank;
> > +	struct v4l2_ctrl	*hflip;
> > +	struct v4l2_ctrl	*vflip;
> > +	struct v4l2_ctrl	*test_pattern;
> 
> Of the above references to controls, only exposure appears to be actually
> used. Please drop the others.
> 

Thanks for reminder.
We found that hblank, vblank, test_pattern are also used in
ov02a10_initialize_controls.
And hflip and vflip would be dropped in next release.

> > +	struct v4l2_mbus_framefmt	fmt;
> > +	struct v4l2_ctrl_handler ctrl_handler;
> > +
> > +	const struct ov02a10_mode *cur_mode;
> > +};
> > +
> > +static inline struct ov02a10 *to_ov02a10(struct v4l2_subdev *sd)
> > +{
> > +	return container_of(sd, struct ov02a10, subdev);
> > +}
> > +
> > +/*
> > + * eclk 24Mhz
> > + * pclk 39Mhz
> > + * linelength 934(0x3a6)
> > + * framelength 1390(0x56E)
> > + * grabwindow_width 1600
> > + * grabwindow_height 1200
> > + * max_framerate 30fps
> > + * mipi_datarate per lane 780Mbps
> > + */
> > +static const struct ov02a10_reg ov02a10_1600x1200_regs[] = {
> > +	{0xfd, 0x01},
> > +	{0xac, 0x00},
> > +	{0xfd, 0x00},
> > +	{0x2f, 0x29},
> > +	{0x34, 0x00},
> > +	{0x35, 0x21},
> > +	{0x30, 0x15},
> > +	{0x33, 0x01},
> > +	{0xfd, 0x01},
> > +	{0x44, 0x00},
> > +	{0x2a, 0x4c},
> > +	{0x2b, 0x1e},
> > +	{0x2c, 0x60},
> > +	{0x25, 0x11},
> > +	{0x03, 0x01},
> > +	{0x04, 0xae},
> > +	{0x09, 0x00},
> > +	{0x0a, 0x02},
> > +	{0x06, 0xa6},
> > +	{0x31, 0x00},
> > +	{0x24, 0x40},
> > +	{0x01, 0x01},
> > +	{0xfb, 0x73},
> > +	{0xfd, 0x01},
> > +	{0x16, 0x04},
> > +	{0x1c, 0x09},
> > +	{0x21, 0x42},
> > +	{0x12, 0x04},
> > +	{0x13, 0x10},
> > +	{0x11, 0x40},
> > +	{0x33, 0x81},
> > +	{0xd0, 0x00},
> > +	{0xd1, 0x01},
> > +	{0xd2, 0x00},
> > +	{0x50, 0x10},
> > +	{0x51, 0x23},
> > +	{0x52, 0x20},
> > +	{0x53, 0x10},
> > +	{0x54, 0x02},
> > +	{0x55, 0x20},
> > +	{0x56, 0x02},
> > +	{0x58, 0x48},
> > +	{0x5d, 0x15},
> > +	{0x5e, 0x05},
> > +	{0x66, 0x66},
> > +	{0x68, 0x68},
> > +	{0x6b, 0x00},
> > +	{0x6c, 0x00},
> > +	{0x6f, 0x40},
> > +	{0x70, 0x40},
> > +	{0x71, 0x0a},
> > +	{0x72, 0xf0},
> > +	{0x73, 0x10},
> > +	{0x75, 0x80},
> > +	{0x76, 0x10},
> > +	{0x84, 0x00},
> > +	{0x85, 0x10},
> > +	{0x86, 0x10},
> > +	{0x87, 0x00},
> > +	{0x8a, 0x22},
> > +	{0x8b, 0x22},
> > +	{0x19, 0xf1},
> > +	{0x29, 0x01},
> > +	{0xfd, 0x01},
> > +	{0x9d, 0xd6},
> > +	{0xa0, 0x29},
> > +	{0xa1, 0x03},
> > +	{0xad, 0x62},
> > +	{0xae, 0x00},
> > +	{0xaf, 0x85},
> > +	{0xb1, 0x01},
> > +	{0x8e, 0x06},
> > +	{0x8f, 0x40},
> > +	{0x90, 0x04},
> > +	{0x91, 0xb0},
> > +	{0x45, 0x01},
> > +	{0x46, 0x00},
> > +	{0x47, 0x6c},
> > +	{0x48, 0x03},
> > +	{0x49, 0x8b},
> > +	{0x4a, 0x00},
> > +	{0x4b, 0x07},
> > +	{0x4c, 0x04},
> > +	{0x4d, 0xb7},
> > +	{0xf0, 0x40},
> > +	{0xf1, 0x40},
> > +	{0xf2, 0x40},
> > +	{0xf3, 0x40},
> > +	{0x3f, 0x00},
> > +	{0xfd, 0x01},
> > +	{0x05, 0x00},
> > +	{0x06, 0xa6},
> > +	{0xfd, 0x01},
> > +};
> > +
> > +static const char * const ov02a10_test_pattern_menu[] = {
> > +	"Disabled",
> > +	"Color Bar",
> > +};
> > +
> > +static const s64 link_freq_menu_items[] = {
> > +	OV02A10_LINK_FREQ_390MHZ
> > +};
> > +
> > +static u64 to_pixel_rate(u32 f_index)
> > +{
> > +	u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV02A10_DATA_LANES;
> > +
> > +	do_div(pixel_rate, OV02A10_BITS_PER_SAMPLE);
> > +
> > +	return pixel_rate;
> > +}
> > +
> > +static const struct ov02a10_mode supported_modes[] = {
> > +	{
> > +		.width = 1600,
> > +		.height = 1200,
> > +		.exp_def = 0x01ae,
> > +		.hts_def = 0x03a6,
> > +		.vts_def = 0x056e,
> > +		.reg_list = {
> > +			.num_of_regs = ARRAY_SIZE(ov02a10_1600x1200_regs),
> > +			.regs = ov02a10_1600x1200_regs,
> > +		},
> > +	},
> > +};
> > +
> > +static int ov02a10_write_array(struct ov02a10 *ov02a10,
> > +			       const struct ov02a10_reg_list *r_list)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	for (i = 0; i < r_list->num_of_regs; i++) {
> > +		ret = i2c_smbus_write_byte_data(client,
> > +						r_list->regs[i].addr,
> > +						r_list->regs[i].val);
> > +		if (ret < 0)
> > +			return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_read_smbus(struct ov02a10 *ov02a10, unsigned char reg,
> > +			      unsigned char *val)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	int ret;
> > +
> > +	ret = i2c_smbus_read_byte_data(client, reg);
> > +	if (ret >= 0) {
> > +		*val = (unsigned char)ret;
> > +		ret = 0;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> > +			     struct v4l2_mbus_framefmt *fmt)
> > +{
> > +	fmt->width = mode->width;
> > +	fmt->height = mode->height;
> > +	fmt->field = V4L2_FIELD_NONE;
> > +}
> > +
> > +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> > +			   struct v4l2_subdev_pad_config *cfg,
> > +			   struct v4l2_subdev_format *fmt)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +	mutex_lock(&ov02a10->mutex);
> > +
> > +	if (ov02a10->streaming) {
> > +		mutex_unlock(&ov02a10->mutex);
> > +		return -EBUSY;
> > +	}
> > +
> > +	/* Only one sensor mode supported */
> > +	mbus_fmt->code = ov02a10->fmt.code;
> > +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +	ov02a10->fmt = fmt->format;
> > +
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> > +			   struct v4l2_subdev_pad_config *cfg,
> > +			   struct v4l2_subdev_format *fmt)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +	mutex_lock(&ov02a10->mutex);
> > +
> > +	fmt->format = ov02a10->fmt;
> > +	mbus_fmt->code = ov02a10->fmt.code;
> > +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> > +				  struct v4l2_subdev_pad_config *cfg,
> > +				  struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	if (code->index >= ARRAY_SIZE(supported_modes))
> > +		return -EINVAL;
> > +
> > +	code->code = ov02a10->fmt.code;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> > +				    struct v4l2_subdev_pad_config *cfg,
> > +				    struct v4l2_subdev_frame_size_enum *fse)
> > +{
> > +	if (fse->index >= ARRAY_SIZE(supported_modes))
> > +		return -EINVAL;
> > +
> > +	fse->min_width  = supported_modes[fse->index].width;
> > +	fse->max_width  = supported_modes[fse->index].width;
> > +	fse->max_height = supported_modes[fse->index].height;
> > +	fse->min_height = supported_modes[fse->index].height;
> > +
> > +	return 0;
> > +}
> > +
> > +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	struct device *dev = &client->dev;
> > +	int ret;
> > +
> > +	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, GPIOD_OUT_LOW);
> > +	gpiod_set_value_cansleep(ov02a10->pd_gpio, GPIOD_OUT_HIGH);
> > +
> > +	ret = clk_prepare_enable(ov02a10->eclk);
> > +	if (ret < 0) {
> > +		dev_err(dev, "failed to enable eclk\n");
> > +		return ret;
> > +	}
> > +
> > +	ret = regulator_bulk_enable(OV02A10_NUM_SUPPLIES, ov02a10->supplies);
> > +	if (ret < 0) {
> > +		dev_err(dev, "failed to enable regulators\n");
> > +		goto disable_clk;
> > +	}
> > +	usleep_range(5000, 6000);
> > +
> > +	gpiod_set_value_cansleep(ov02a10->pd_gpio, GPIOD_OUT_LOW);
> > +	usleep_range(5000, 6000);
> > +
> > +	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, GPIOD_OUT_HIGH);
> > +	usleep_range(5000, 6000);
> > +
> > +	return 0;
> > +
> > +disable_clk:
> > +	clk_disable_unprepare(ov02a10->eclk);
> > +
> > +	return ret;
> > +}
> > +
> > +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> > +{
> > +	gpiod_set_value_cansleep(ov02a10->n_rst_gpio, 1);
> > +	clk_disable_unprepare(ov02a10->eclk);
> > +	gpiod_set_value_cansleep(ov02a10->pd_gpio, 1);
> > +	regulator_bulk_disable(OV02A10_NUM_SUPPLIES, ov02a10->supplies);
> > +}
> > +
> > +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	const struct ov02a10_reg_list *reg_list;
> > +	int ret;
> > +
> > +	/* Apply default values of current mode */
> > +	reg_list = &ov02a10->cur_mode->reg_list;
> > +	ret = ov02a10_write_array(ov02a10, reg_list);
> > +	if (ret)
> > +		return ret;
> > +
> > +	/* Apply customized values from user */
> > +	ret = __v4l2_ctrl_handler_setup(ov02a10->subdev.ctrl_handler);
> > +	if (ret)
> > +		return ret;
> > +
> > +	/* Set orientation to 180 degree */
> > +	if (ov02a10->upside_down) {
> > +		ret = i2c_smbus_write_byte_data(client, REG_MIRROR_FLIP_CONTROL,
> > +						REG_MIRROR_FLIP_ENABLE);
> > +		if (ret) {
> > +			dev_err(&client->dev, "failed to set orientation\n");
> > +			return ret;
> > +		}
> > +		ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> > +						REG_ENABLE);
> > +		if (ret < 0)
> > +			return ret;
> > +	}
> > +
> > +	/* Set stream on register */
> > +	return i2c_smbus_write_byte_data(client,
> > +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> > +}
> > +
> > +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +
> > +	return i2c_smbus_write_byte_data(client,
> > +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
> 
> Indentation.
> 

Fixed in next release.

> > +}
> > +
> > +static int ov02a10_entity_init_cfg(struct v4l2_subdev *sd,
> > +				   struct v4l2_subdev_pad_config *cfg)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_subdev_format fmt = { 0 };
> > +
> > +	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
> > +	fmt.format.width = ov02a10->cur_mode->width;
> > +	fmt.format.height = ov02a10->cur_mode->width;
> > +
> > +	ov02a10_set_fmt(sd, cfg, &fmt);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	int ret = 0;
> > +
> > +	dev_dbg(&client->dev, "ov02a10 s_stream (%d)\n", on);
> > +	mutex_lock(&ov02a10->mutex);
> > +
> > +	if (ov02a10->streaming == on)
> > +		goto unlock_and_return;
> > +
> > +	if (on) {
> > +		ret = pm_runtime_get_sync(&client->dev);
> > +		if (ret < 0) {
> > +			pm_runtime_put_noidle(&client->dev);
> > +			goto unlock_and_return;
> > +		}
> > +
> > +		ret = __ov02a10_start_stream(ov02a10);
> > +		if (ret) {
> > +			__ov02a10_stop_stream(ov02a10);
> > +			ov02a10->streaming = !on;
> > +			goto err_rpm_put;
> > +		}
> > +	} else {
> > +		__ov02a10_stop_stream(ov02a10);
> > +		pm_runtime_put(&client->dev);
> > +	}
> > +
> > +	ov02a10->streaming = on;
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return ret;
> > +
> > +err_rpm_put:
> > +	pm_runtime_put(&client->dev);
> > +unlock_and_return:
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	return __ov02a10_power_on(ov02a10);
> > +}
> > +
> > +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	__ov02a10_power_off(ov02a10);
> > +
> > +	return 0;
> > +}
> 
> Please move the content of the both functions here; you don't need another
> pair with just different arguments.
> 

Good idea.
We would move the code of power on and off directly to the resume and
suspend callbacks in next release.

> > +
> > +static const struct dev_pm_ops ov02a10_pm_ops = {
> > +	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> > +				pm_runtime_force_resume)
> > +	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> > +			   ov02a10_runtime_resume, NULL)
> > +};
> > +
> > +/*
> > + * ov02a10_set_exposure - Function called when setting exposure time
> > + * @priv: Pointer to device structure
> > + * @val: Variable for exposure time, in the unit of micro-second
> > + *
> > + * Set exposure time based on input value.
> > + *
> > + * Return: 0 on success
> > + */
> > +static int ov02a10_set_exposure(struct ov02a10 *ov02a10, int val)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	int ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_H,
> > +					((val >> OV02A10_EXP_SHIFT) &
> > +					OV02A10_MASK_8_BITS));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_L,
> > +					(val & OV02A10_MASK_8_BITS));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> > +					 REG_ENABLE);
> > +}
> > +
> > +static int ov02a10_set_gain(struct ov02a10 *ov02a10, int val)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	int ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_GAIN,
> > +					(val & OV02A10_MASK_8_BITS));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> > +					 REG_ENABLE);
> > +}
> > +
> > +static int ov02a10_set_vblank(struct ov02a10 *ov02a10, int val)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	int ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H,
> > +					(((val + ov02a10->cur_mode->height -
> > +					OV02A10_BASIC_LINE) >>
> > +					OV02A10_VTS_SHIFT) &
> > +					OV02A10_MASK_8_BITS));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L,
> > +					((val + ov02a10->cur_mode->height -
> > +					OV02A10_BASIC_LINE) &
> > +					OV02A10_MASK_8_BITS));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> > +					 REG_ENABLE);
> > +}
> > +
> > +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, int pattern)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	int ret;
> > +
> > +	if (pattern)
> > +		pattern = OV02A10_TEST_PATTERN_ENABLE;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, OV02A10_REG_TEST_PATTERN,
> > +					pattern);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> > +					REG_ENABLE);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
> > +					 SC_CTRL_MODE_STREAMING);
> > +}
> > +
> > +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> > +					       struct ov02a10, ctrl_handler);
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	s64 max_expo;
> > +	int ret;
> > +
> > +	/* Propagate change of current control to all related controls */
> > +	if (ctrl->id == V4L2_CID_VBLANK) {
> > +		/* Update max exposure while meeting expected vblanking */
> > +		max_expo = ov02a10->cur_mode->height + ctrl->val -
> > +			   OV02A10_EXPOSURE_MAX_MARGIN;
> > +		__v4l2_ctrl_modify_range(ov02a10->exposure,
> > +					 ov02a10->exposure->minimum, max_expo,
> > +					 ov02a10->exposure->step,
> > +					 ov02a10->exposure->default_value);
> > +	}
> > +
> > +	/* V4L2 controls values will be applied only when power is already up */
> > +	if (!pm_runtime_get_if_in_use(&client->dev))
> > +		return 0;
> > +
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_EXPOSURE:
> > +		ret = ov02a10_set_exposure(ov02a10, ctrl->val);
> > +		break;
> > +	case V4L2_CID_ANALOGUE_GAIN:
> > +		ret = ov02a10_set_gain(ov02a10, ctrl->val);
> > +		break;
> > +	case V4L2_CID_VBLANK:
> > +		ret = ov02a10_set_vblank(ov02a10, ctrl->val);
> > +		break;
> > +	case V4L2_CID_TEST_PATTERN:
> > +		ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
> > +		break;
> > +	};
> > +
> > +	pm_runtime_put(&client->dev);
> > +
> > +	return ret;
> > +}
> > +
> > +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> > +	.s_stream = ov02a10_s_stream,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> > +	.init_cfg = ov02a10_entity_init_cfg,
> > +	.enum_mbus_code = ov02a10_enum_mbus_code,
> > +	.enum_frame_size = ov02a10_enum_frame_sizes,
> > +	.get_fmt = ov02a10_get_fmt,
> > +	.set_fmt = ov02a10_set_fmt,
> > +};
> > +
> > +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> > +	.video	= &ov02a10_video_ops,
> > +	.pad	= &ov02a10_pad_ops,
> > +};
> > +
> > +static const struct media_entity_operations ov02a10_subdev_entity_ops = {
> > +	.link_validate = v4l2_subdev_link_validate,
> > +};
> > +
> > +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> > +	.s_ctrl = ov02a10_set_ctrl,
> > +};
> > +
> > +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	const struct ov02a10_mode *mode;
> > +	struct v4l2_ctrl_handler *handler;
> > +	struct v4l2_ctrl *ctrl;
> > +	u64 exposure_max;
> > +	u32 pixel_rate, h_blank;
> > +	int ret;
> > +
> > +	handler = &ov02a10->ctrl_handler;
> > +	mode = ov02a10->cur_mode;
> > +	ret = v4l2_ctrl_handler_init(handler, 7);
> > +	if (ret)
> > +		return ret;
> > +
> > +	handler->lock = &ov02a10->mutex;
> > +
> > +	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> > +				      0, 0, link_freq_menu_items);
> > +	if (ctrl)
> > +		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	pixel_rate = to_pixel_rate(0);
> > +	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> > +			  0, pixel_rate, 1, pixel_rate);
> > +
> > +	h_blank = mode->hts_def - mode->width;
> > +	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> > +					    h_blank, h_blank, 1, h_blank);
> > +	if (ov02a10->hblank)
> > +		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					    V4L2_CID_VBLANK, mode->vts_def -
> > +					    mode->height,
> > +					    OV02A10_VTS_MAX - mode->height, 1,
> > +					    mode->vts_def - mode->height);
> > +
> > +	exposure_max = mode->vts_def - 4;
> > +	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					      V4L2_CID_EXPOSURE,
> > +					      OV02A10_EXPOSURE_MIN,
> > +					      exposure_max,
> > +					      OV02A10_EXPOSURE_STEP,
> > +					      mode->exp_def);
> > +
> > +	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					       V4L2_CID_ANALOGUE_GAIN,
> > +					       OV02A10_GAIN_MIN,
> > +					       OV02A10_GAIN_MAX,
> > +					       OV02A10_GAIN_STEP,
> > +					       OV02A10_GAIN_DEFAULT);
> > +
> > +	ov02a10->test_pattern =
> > +		v4l2_ctrl_new_std_menu_items(handler,
> > +					     &ov02a10_ctrl_ops,
> > +					     V4L2_CID_TEST_PATTERN,
> > +					     ARRAY_SIZE(ov02a10_test_pattern_menu) -
> > +					     1, 0, 0,
> > +					     ov02a10_test_pattern_menu);
> > +
> > +	if (handler->error) {
> > +		ret = handler->error;
> > +		dev_err(&client->dev, "failed to init controls(%d)\n", ret);
> > +		goto err_free_handler;
> > +	}
> > +
> > +	ov02a10->subdev.ctrl_handler = handler;
> > +
> > +	return 0;
> > +
> > +err_free_handler:
> > +	v4l2_ctrl_handler_free(handler);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_check_hwcfg(struct device *dev)
> > +{
> > +	struct fwnode_handle *ep;
> > +	struct fwnode_handle *fwnode = dev_fwnode(dev);
> > +	struct v4l2_fwnode_endpoint bus_cfg = {
> > +		.bus_type = V4L2_MBUS_CSI2_DPHY
> > +	};
> > +	unsigned int i, j;
> > +	int ret;
> > +
> > +	if (!fwnode)
> > +		return -ENXIO;
> > +
> > +	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
> > +	if (!ep)
> > +		return -ENXIO;
> > +
> > +	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> > +	fwnode_handle_put(ep);
> > +	if (ret)
> > +		return ret;
> > +
> > +	if (!bus_cfg.nr_of_link_frequencies) {
> > +		dev_err(dev, "no link frequencies defined");
> > +		ret = -EINVAL;
> > +		goto check_hwcfg_error;
> > +	}
> > +
> > +	for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
> > +		for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
> > +			if (link_freq_menu_items[i] ==
> > +				bus_cfg.link_frequencies[j])
> > +				break;
> > +		}
> > +
> > +		if (j == bus_cfg.nr_of_link_frequencies) {
> > +			dev_err(dev, "no link frequency %lld supported",
> > +				link_freq_menu_items[i]);
> > +			ret = -EINVAL;
> > +			goto check_hwcfg_error;
> > +		}
> > +	}
> > +
> > +check_hwcfg_error:
> > +	v4l2_fwnode_endpoint_free(&bus_cfg);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +	u16 id;
> > +	u8 pid = 0;
> > +	u8 ver = 0;
> > +	int ret;
> > +
> > +	/* Check sensor revision */
> > +	ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_H, &pid);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_L, &ver);
> > +	if (ret)
> > +		return ret;
> > +
> > +	id = OV02A10_ID(pid, ver);
> > +	if (id != CHIP_ID) {
> > +		dev_err(&client->dev, "Unexpected sensor id(%04x)\n", id);
> > +		return ret;
> > +	}
> > +
> > +	dev_info(&client->dev, "Detected OV%04X sensor\n", id);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_probe(struct i2c_client *client)
> > +{
> > +	struct device *dev = &client->dev;
> > +	struct ov02a10 *ov02a10;
> > +	unsigned int rotation;
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	dev_info(dev, "ov02a10 probe aaaa++\n");
> 
> Please remove.
> 

Fixed in next release.

> > +
> > +	ret = ov02a10_check_hwcfg(dev);
> > +	if (ret) {
> > +		dev_err(dev, "failed to check HW configuration: %d",
> > +			ret);
> > +		return ret;
> > +	}
> > +
> > +	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> > +	if (!ov02a10)
> > +		return -ENOMEM;
> > +
> > +	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> > +	ov02a10->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +
> > +	/* Optional indication of physical rotation of sensor */
> > +	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> > +				       &rotation);
> > +	if (!ret) {
> > +		switch (rotation) {
> > +		case 180:
> > +			ov02a10->upside_down = true;
> > +			ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10;
> > +			break;
> > +		case 0:
> > +			break;
> > +		default:
> > +			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> > +				 rotation);
> > +		}
> > +	}
> > +
> > +	/* Get system clock (eclk) */
> > +	ov02a10->eclk = devm_clk_get(dev, "eclk");
> > +	if (IS_ERR(ov02a10->eclk)) {
> > +		dev_err(dev, "failed to get eclk\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
> > +				       &ov02a10->eclk_freq);
> > +	if (ret) {
> > +		dev_err(dev, "failed to get eclk frequency\n");
> > +		return ret;
> > +	}
> > +
> > +	ret = clk_set_rate(ov02a10->eclk, ov02a10->eclk_freq);
> > +	if (ret) {
> > +		dev_err(dev, "failed to set eclk frequency (24MHz)\n");
> > +		return ret;
> > +	}
> > +
> > +	if (clk_get_rate(ov02a10->eclk) != OV02A10_ECLK_FREQ) {
> > +		dev_warn(dev, "wrong eclk frequency %d Hz, expected: %d Hz\n",
> > +			 ov02a10->eclk_freq, OV02A10_ECLK_FREQ);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ov02a10->pd_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_HIGH);
> > +	if (IS_ERR(ov02a10->pd_gpio)) {
> > +		dev_err(dev, "failed to get powerdown-gpios\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ov02a10->n_rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> > +	if (IS_ERR(ov02a10->n_rst_gpio)) {
> > +		dev_err(dev, "failed to get reset-gpios\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	for (i = 0; i < OV02A10_NUM_SUPPLIES; i++)
> > +		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> > +
> > +	ret = devm_regulator_bulk_get(dev,
> > +				      OV02A10_NUM_SUPPLIES,
> 
> Fits on a single line.
> 

Fixed in next release.

> > +				      ov02a10->supplies);
> > +	if (ret) {
> > +		dev_err(dev, "failed to get regulators\n");
> > +		return ret;
> > +	}
> > +
> > +	mutex_init(&ov02a10->mutex);
> > +	ov02a10->cur_mode = &supported_modes[0];
> > +	ret = ov02a10_initialize_controls(ov02a10);
> > +	if (ret) {
> > +		dev_err(dev, "failed to initialize controls\n");
> > +		goto err_destroy_mutex;
> > +	}
> > +
> > +	ret = __ov02a10_power_on(ov02a10);
> > +	if (ret)
> > +		goto err_free_handler;
> > +
> > +	ret = ov02a10_check_sensor_id(ov02a10);
> > +	if (ret)
> > +		goto err_power_off;
> > +
> > +	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +	ov02a10->subdev.entity.ops = &ov02a10_subdev_entity_ops;
> > +	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> > +	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> > +	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> > +	if (ret < 0) {
> > +		dev_err(dev, "failed to init entity pads: %d", ret);
> > +		goto err_power_off;
> > +	}
> > +
> > +	ret = v4l2_async_register_subdev(&ov02a10->subdev);
> > +	if (ret) {
> > +		dev_err(dev, "failed to register V4L2 subdev: %d",
> > +			ret);
> > +		goto err_clean_entity;
> > +	}
> > +
> > +	pm_runtime_set_active(dev);
> > +	pm_runtime_enable(dev);
> > +	pm_runtime_idle(dev);
> > +
> > +	dev_info(dev, "ov02a10 probe --\n");
> 
> Ditto.
> 

Fixed in next release.

> > +	return 0;
> > +
> > +err_clean_entity:
> > +	media_entity_cleanup(&ov02a10->subdev.entity);
> > +err_power_off:
> > +	__ov02a10_power_off(ov02a10);
> > +err_free_handler:
> > +	v4l2_ctrl_handler_free(ov02a10->subdev.ctrl_handler);
> > +err_destroy_mutex:
> > +	mutex_destroy(&ov02a10->mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_remove(struct i2c_client *client)
> > +{
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	v4l2_async_unregister_subdev(sd);
> > +	media_entity_cleanup(&sd->entity);
> > +	v4l2_ctrl_handler_free(sd->ctrl_handler);
> > +	pm_runtime_disable(&client->dev);
> > +	if (!pm_runtime_status_suspended(&client->dev))
> > +		__ov02a10_power_off(ov02a10);
> > +	pm_runtime_set_suspended(&client->dev);
> > +	mutex_destroy(&ov02a10->mutex);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id ov02a10_of_match[] = {
> > +	{ .compatible = "ovti,ov02a10" },
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> > +
> > +static struct i2c_driver ov02a10_i2c_driver = {
> > +	.driver = {
> > +		.name = "ov02a10",
> > +		.pm = &ov02a10_pm_ops,
> > +		.of_match_table = ov02a10_of_match,
> > +	},
> > +	.probe_new	= &ov02a10_probe,
> > +	.remove		= &ov02a10_remove,
> > +};
> > +
> > +module_i2c_driver(ov02a10_i2c_driver);
> > +
> > +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> > +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> > +MODULE_LICENSE("GPL v2");
> > +
>