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Date:   Tue, 7 Nov 2023 09:25:33 +0100
From:   Alain Volmat <alain.volmat@foss.st.com>
To:     Sebastian Reichel <sre@kernel.org>
CC:     Sakari Ailus <sakari.ailus@linux.intel.com>,
        Jacopo Mondi <jacopo.mondi@ideasonboard.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        <linux-media@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 4/4] media: i2c: gc0308: new driver
Message-ID: <20231107082533.GA3172159@gnbcxd0016.gnb.st.com>
Mail-Followup-To: Sebastian Reichel <sre@kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Jacopo Mondi <jacopo.mondi@ideasonboard.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>, linux-media@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20231027011417.2174658-1-sre@kernel.org>
 <20231027011417.2174658-5-sre@kernel.org>
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In-Reply-To: <20231027011417.2174658-5-sre@kernel.org>
Precedence: bulk

Hi Sebastian,

On Fri, Oct 27, 2023 at 03:12:04AM +0200, Sebastian Reichel wrote:
> Introduce new driver for GalaxyCore GC0308, which is a cheap
> 640x480 with an on-chip ISP sensor sold since 2010. Data is
> provided via parallel bus.
> 
> Signed-off-by: Sebastian Reichel <sre@kernel.org>
> ---
>  MAINTAINERS                |    7 +
>  drivers/media/i2c/Kconfig  |   10 +
>  drivers/media/i2c/Makefile |    1 +
>  drivers/media/i2c/gc0308.c | 1437 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 1455 insertions(+)
>  create mode 100644 drivers/media/i2c/gc0308.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 5f64cd42ff37..f03fd34067d0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8627,6 +8627,13 @@ F:	drivers/mfd/gateworks-gsc.c
>  F:	include/linux/mfd/gsc.h
>  F:	include/linux/platform_data/gsc_hwmon.h
>  
> +GC0308 GALAXYCORE CAMERA SENSOR DRIVER
> +M:	Sebastian Reichel <sre@kernel.org>
> +L:	linux-media@vger.kernel.org
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/media/i2c/galaxycore,gc0308.yaml
> +F:	drivers/media/i2c/gc0308.c
> +
>  GCC PLUGINS
>  M:	Kees Cook <keescook@chromium.org>
>  L:	linux-hardening@vger.kernel.org
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 74ff833ff48c..d7e52a9d3dd2 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -50,6 +50,16 @@ config VIDEO_AR0521
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called ar0521.
>  
> +config VIDEO_GC0308
> +	tristate "GalaxyCore GC0308 sensor support"
> +	select V4L2_CCI_I2C
> +	help
> +	  This is a Video4Linux2 sensor driver for the GalaxyCore
> +	  GC0308 camera.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called gc0308.
> +
>  config VIDEO_HI556
>  	tristate "Hynix Hi-556 sensor support"
>  	help
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index 80b00d39b48f..f03a21f2962a 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_VIDEO_DW9719) += dw9719.o
>  obj-$(CONFIG_VIDEO_DW9768) += dw9768.o
>  obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
>  obj-$(CONFIG_VIDEO_ET8EK8) += et8ek8/
> +obj-$(CONFIG_VIDEO_GC0308) += gc0308.o
>  obj-$(CONFIG_VIDEO_HI556) += hi556.o
>  obj-$(CONFIG_VIDEO_HI846) += hi846.o
>  obj-$(CONFIG_VIDEO_HI847) += hi847.o
> diff --git a/drivers/media/i2c/gc0308.c b/drivers/media/i2c/gc0308.c
> new file mode 100644
> index 000000000000..3f117ece64ea
> --- /dev/null
> +++ b/drivers/media/i2c/gc0308.c
> @@ -0,0 +1,1437 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for the GalaxyCore GC0308 camera sensor.
> + *
> + * Copyright (c) 2023 Sebastian Reichel <sre@kernel.org>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <media/v4l2-cci.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +/* Analog & CISCTL*/
> +#define GC0308_CHIP_ID			CCI_REG8(0x000)
> +#define GC0308_HBLANK			CCI_REG8(0x001)
> +#define GC0308_VBLANK			CCI_REG8(0x002)
> +#define GC0308_EXP			CCI_REG16(0x003)
> +#define GC0308_ROW_START		CCI_REG16(0x005)
> +#define GC0308_COL_START		CCI_REG16(0x007)
> +#define GC0308_WIN_HEIGHT		CCI_REG16(0x009)
> +#define GC0308_WIN_WIDTH		CCI_REG16(0x00b)
> +#define GC0308_VS_START_TIME		CCI_REG8(0x00d) /* in rows */
> +#define GC0308_VS_END_TIME		CCI_REG8(0x00e) /* in rows */
> +#define GC0308_VB_HB			CCI_REG8(0x00f)
> +#define GC0308_RSH_WIDTH		CCI_REG8(0x010)
> +#define GC0308_TSP_WIDTH		CCI_REG8(0x011)
> +#define GC0308_SAMPLE_HOLD_DELAY	CCI_REG8(0x012)
> +#define GC0308_ROW_TAIL_WIDTH		CCI_REG8(0x013)
> +#define GC0308_CISCTL_MODE1		CCI_REG8(0x014)
> +#define GC0308_CISCTL_MODE2		CCI_REG8(0x015)
> +#define GC0308_CISCTL_MODE3		CCI_REG8(0x016)
> +#define GC0308_CISCTL_MODE4		CCI_REG8(0x017)
> +#define GC0308_ANALOG_MODE1		CCI_REG8(0x01a)
> +#define GC0308_ANALOG_MODE2		CCI_REG8(0x01b)
> +#define GC0308_HRST_RSG_V18		CCI_REG8(0x01c)
> +#define GC0308_VREF_V25			CCI_REG8(0x01d)
> +#define GC0308_ADC_R			CCI_REG8(0x01e)
> +#define GC0308_PAD_DRV			CCI_REG8(0x01f)
> +#define GC0308_SOFT_RESET		CCI_REG8(0x0fe)
> +
> +/* ISP */
> +#define GC0308_BLOCK_EN1		CCI_REG8(0x020)
> +#define GC0308_BLOCK_EN2		CCI_REG8(0x021)
> +#define GC0308_AAAA_EN			CCI_REG8(0x022)
> +#define GC0308_SPECIAL_EFFECT		CCI_REG8(0x023)
> +#define GC0308_OUT_FORMAT		CCI_REG8(0x024)
> +#define GC0308_OUT_EN			CCI_REG8(0x025)
> +#define GC0308_SYNC_MODE		CCI_REG8(0x026)
> +#define GC0308_CLK_DIV_MODE		CCI_REG8(0x028)
> +#define GC0308_BYPASS_MODE		CCI_REG8(0x029)
> +#define GC0308_CLK_GATING		CCI_REG8(0x02a)
> +#define GC0308_DITHER_MODE		CCI_REG8(0x02b)
> +#define GC0308_DITHER_BIT		CCI_REG8(0x02c)
> +#define GC0308_DEBUG_MODE1		CCI_REG8(0x02d)
> +#define GC0308_DEBUG_MODE2		CCI_REG8(0x02e)
> +#define GC0308_DEBUG_MODE3		CCI_REG8(0x02f)
> +#define GC0308_CROP_WIN_MODE		CCI_REG8(0x046)
> +#define GC0308_CROP_WIN_Y1		CCI_REG8(0x047)
> +#define GC0308_CROP_WIN_X1		CCI_REG8(0x048)
> +#define GC0308_CROP_WIN_HEIGHT		CCI_REG16(0x049)
> +#define GC0308_CROP_WIN_WIDTH		CCI_REG16(0x04b)
> +
> +/* BLK */
> +#define GC0308_BLK_MODE			CCI_REG8(0x030)
> +#define GC0308_BLK_LIMIT_VAL		CCI_REG8(0x031)
> +#define GC0308_GLOBAL_OFF		CCI_REG8(0x032)
> +#define GC0308_CURRENT_R_OFF		CCI_REG8(0x033)
> +#define GC0308_CURRENT_G_OFF		CCI_REG8(0x034)
> +#define GC0308_CURRENT_B_OFF		CCI_REG8(0x035)
> +#define GC0308_CURRENT_R_DARK_CURRENT	CCI_REG8(0x036)
> +#define GC0308_CURRENT_G_DARK_CURRENT	CCI_REG8(0x037)
> +#define GC0308_CURRENT_B_DARK_CURRENT	CCI_REG8(0x038)
> +#define GC0308_EXP_RATE_DARKC		CCI_REG8(0x039)
> +#define GC0308_OFF_SUBMODE		CCI_REG8(0x03a)
> +#define GC0308_DARKC_SUBMODE		CCI_REG8(0x03b)
> +#define GC0308_MANUAL_G1_OFF		CCI_REG8(0x03c)
> +#define GC0308_MANUAL_R1_OFF		CCI_REG8(0x03d)
> +#define GC0308_MANUAL_B2_OFF		CCI_REG8(0x03e)
> +#define GC0308_MANUAL_G2_OFF		CCI_REG8(0x03f)
> +
> +/* PREGAIN */
> +#define GC0308_GLOBAL_GAIN		CCI_REG8(0x050)
> +#define GC0308_AUTO_PREGAIN		CCI_REG8(0x051)
> +#define GC0308_AUTO_POSTGAIN		CCI_REG8(0x052)
> +#define GC0308_CHANNEL_GAIN_G1		CCI_REG8(0x053)
> +#define GC0308_CHANNEL_GAIN_R		CCI_REG8(0x054)
> +#define GC0308_CHANNEL_GAIN_B		CCI_REG8(0x055)
> +#define GC0308_CHANNEL_GAIN_G2		CCI_REG8(0x056)
> +#define GC0308_R_RATIO			CCI_REG8(0x057)
> +#define GC0308_G_RATIO			CCI_REG8(0x058)
> +#define GC0308_B_RATIO			CCI_REG8(0x059)
> +#define GC0308_AWB_R_GAIN		CCI_REG8(0x05a)
> +#define GC0308_AWB_G_GAIN		CCI_REG8(0x05b)
> +#define GC0308_AWB_B_GAIN		CCI_REG8(0x05c)
> +#define GC0308_LSC_DEC_LVL1		CCI_REG8(0x05d)
> +#define GC0308_LSC_DEC_LVL2		CCI_REG8(0x05e)
> +#define GC0308_LSC_DEC_LVL3		CCI_REG8(0x05f)
> +
> +/* DNDD */
> +#define GC0308_DN_MODE_EN		CCI_REG8(0x060)
> +#define GC0308_DN_MODE_RATIO		CCI_REG8(0x061)
> +#define GC0308_DN_BILAT_B_BASE		CCI_REG8(0x062)
> +#define GC0308_DN_B_INCR		CCI_REG8(0x063)
> +#define GC0308_DN_BILAT_N_BASE		CCI_REG8(0x064)
> +#define GC0308_DN_N_INCR		CCI_REG8(0x065)
> +#define GC0308_DD_DARK_BRIGHT_TH	CCI_REG8(0x066)
> +#define GC0308_DD_FLAT_TH		CCI_REG8(0x067)
> +#define GC0308_DD_LIMIT			CCI_REG8(0x068)
> +
> +/* ASDE - Auto Saturation De-noise and Edge-Enhancement */
> +#define GC0308_ASDE_GAIN_TRESH		CCI_REG8(0x069)
> +#define GC0308_ASDE_GAIN_MODE		CCI_REG8(0x06a)
> +#define GC0308_ASDE_DN_SLOPE		CCI_REG8(0x06b)
> +#define GC0308_ASDE_DD_BRIGHT		CCI_REG8(0x06c)
> +#define GC0308_ASDE_DD_LIMIT		CCI_REG8(0x06d)
> +#define GC0308_ASDE_AUTO_EE1		CCI_REG8(0x06e)
> +#define GC0308_ASDE_AUTO_EE2		CCI_REG8(0x06f)
> +#define GC0308_ASDE_AUTO_SAT_DEC_SLOPE	CCI_REG8(0x070)
> +#define GC0308_ASDE_AUTO_SAT_LOW_LIMIT	CCI_REG8(0x071)
> +
> +/* INTPEE - Interpolation and Edge-Enhancement */
> +#define GC0308_EEINTP_MODE_1		CCI_REG8(0x072)
> +#define GC0308_EEINTP_MODE_2		CCI_REG8(0x073)
> +#define GC0308_DIRECTION_TH1		CCI_REG8(0x074)
> +#define GC0308_DIRECTION_TH2		CCI_REG8(0x075)
> +#define GC0308_DIFF_HV_TI_TH		CCI_REG8(0x076)
> +#define GC0308_EDGE12_EFFECT		CCI_REG8(0x077)
> +#define GC0308_EDGE_POS_RATIO		CCI_REG8(0x078)
> +#define GC0308_EDGE1_MINMAX		CCI_REG8(0x079)
> +#define GC0308_EDGE2_MINMAX		CCI_REG8(0x07a)
> +#define GC0308_EDGE12_TH		CCI_REG8(0x07b)
> +#define GC0308_EDGE_MAX			CCI_REG8(0x07c)
> +
> +/* ABB - Auto Black Balance */
> +#define GC0308_ABB_MODE			CCI_REG8(0x080)
> +#define GC0308_ABB_TARGET_AVGH		CCI_REG8(0x081)
> +#define GC0308_ABB_TARGET_AVGL		CCI_REG8(0x082)
> +#define GC0308_ABB_LIMIT_VAL		CCI_REG8(0x083)
> +#define GC0308_ABB_SPEED		CCI_REG8(0x084)
> +#define GC0308_CURR_R_BLACK_LVL		CCI_REG8(0x085)
> +#define GC0308_CURR_G_BLACK_LVL		CCI_REG8(0x086)
> +#define GC0308_CURR_B_BLACK_LVL		CCI_REG8(0x087)
> +#define GC0308_CURR_R_BLACK_FACTOR	CCI_REG8(0x088)
> +#define GC0308_CURR_G_BLACK_FACTOR	CCI_REG8(0x089)
> +#define GC0308_CURR_B_BLACK_FACTOR	CCI_REG8(0x08a)
> +
> +/* LSC - Lens Shading Correction */
> +#define GC0308_LSC_RED_B2		CCI_REG8(0x08b)
> +#define GC0308_LSC_GREEN_B2		CCI_REG8(0x08c)
> +#define GC0308_LSC_BLUE_B2		CCI_REG8(0x08d)
> +#define GC0308_LSC_RED_B4		CCI_REG8(0x08e)
> +#define GC0308_LSC_GREEN_B4		CCI_REG8(0x08f)
> +#define GC0308_LSC_BLUE_B4		CCI_REG8(0x090)
> +#define GC0308_LSC_ROW_CENTER		CCI_REG8(0x091)
> +#define GC0308_LSC_COL_CENTER		CCI_REG8(0x092)
> +
> +/* CC - Channel Coefficient */
> +#define GC0308_CC_MATRIX_C11		CCI_REG8(0x093)
> +#define GC0308_CC_MATRIX_C12		CCI_REG8(0x094)
> +#define GC0308_CC_MATRIX_C13		CCI_REG8(0x095)
> +#define GC0308_CC_MATRIX_C21		CCI_REG8(0x096)
> +#define GC0308_CC_MATRIX_C22		CCI_REG8(0x097)
> +#define GC0308_CC_MATRIX_C23		CCI_REG8(0x098)
> +#define GC0308_CC_MATRIX_C41		CCI_REG8(0x09c)
> +#define GC0308_CC_MATRIX_C42		CCI_REG8(0x09d)
> +#define GC0308_CC_MATRIX_C43		CCI_REG8(0x09e)
> +
> +/* GAMMA */
> +#define GC0308_GAMMA_OUT0		CCI_REG8(0x09f)
> +#define GC0308_GAMMA_OUT1		CCI_REG8(0x0a0)
> +#define GC0308_GAMMA_OUT2		CCI_REG8(0x0a1)
> +#define GC0308_GAMMA_OUT3		CCI_REG8(0x0a2)
> +#define GC0308_GAMMA_OUT4		CCI_REG8(0x0a3)
> +#define GC0308_GAMMA_OUT5		CCI_REG8(0x0a4)
> +#define GC0308_GAMMA_OUT6		CCI_REG8(0x0a5)
> +#define GC0308_GAMMA_OUT7		CCI_REG8(0x0a6)
> +#define GC0308_GAMMA_OUT8		CCI_REG8(0x0a7)
> +#define GC0308_GAMMA_OUT9		CCI_REG8(0x0a8)
> +#define GC0308_GAMMA_OUT10		CCI_REG8(0x0a9)
> +#define GC0308_GAMMA_OUT11		CCI_REG8(0x0aa)
> +#define GC0308_GAMMA_OUT12		CCI_REG8(0x0ab)
> +#define GC0308_GAMMA_OUT13		CCI_REG8(0x0ac)
> +#define GC0308_GAMMA_OUT14		CCI_REG8(0x0ad)
> +#define GC0308_GAMMA_OUT15		CCI_REG8(0x0ae)
> +#define GC0308_GAMMA_OUT16		CCI_REG8(0x0af)
> +
> +/* YCP */
> +#define GC0308_GLOBAL_SATURATION	CCI_REG8(0x0b0)
> +#define GC0308_SATURATION_CB		CCI_REG8(0x0b1)
> +#define GC0308_SATURATION_CR		CCI_REG8(0x0b2)
> +#define GC0308_LUMA_CONTRAST		CCI_REG8(0x0b3)
> +#define GC0308_CONTRAST_CENTER		CCI_REG8(0x0b4)
> +#define GC0308_LUMA_OFFSET		CCI_REG8(0x0b5)
> +#define GC0308_SKIN_CB_CENTER		CCI_REG8(0x0b6)
> +#define GC0308_SKIN_CR_CENTER		CCI_REG8(0x0b7)
> +#define GC0308_SKIN_RADIUS_SQUARE	CCI_REG8(0x0b8)
> +#define GC0308_SKIN_BRIGHTNESS		CCI_REG8(0x0b9)
> +#define GC0308_FIXED_CB			CCI_REG8(0x0ba)
> +#define GC0308_FIXED_CR			CCI_REG8(0x0bb)
> +#define GC0308_EDGE_DEC_SA		CCI_REG8(0x0bd)
> +#define GC0308_AUTO_GRAY_MODE		CCI_REG8(0x0be)
> +#define GC0308_SATURATION_SUB_STRENGTH	CCI_REG8(0x0bf)
> +#define GC0308_Y_GAMMA_OUT0		CCI_REG8(0x0c0)
> +#define GC0308_Y_GAMMA_OUT1		CCI_REG8(0x0c1)
> +#define GC0308_Y_GAMMA_OUT2		CCI_REG8(0x0c2)
> +#define GC0308_Y_GAMMA_OUT3		CCI_REG8(0x0c3)
> +#define GC0308_Y_GAMMA_OUT4		CCI_REG8(0x0c4)
> +#define GC0308_Y_GAMMA_OUT5		CCI_REG8(0x0c5)
> +#define GC0308_Y_GAMMA_OUT6		CCI_REG8(0x0c6)
> +#define GC0308_Y_GAMMA_OUT7		CCI_REG8(0x0c7)
> +#define GC0308_Y_GAMMA_OUT8		CCI_REG8(0x0c8)
> +#define GC0308_Y_GAMMA_OUT9		CCI_REG8(0x0c9)
> +#define GC0308_Y_GAMMA_OUT10		CCI_REG8(0x0ca)
> +#define GC0308_Y_GAMMA_OUT11		CCI_REG8(0x0cb)
> +#define GC0308_Y_GAMMA_OUT12		CCI_REG8(0x0cc)
> +
> +/* AEC - Automatic Exposure Control */
> +#define GC0308_AEC_MODE1		CCI_REG8(0x0d0)
> +#define GC0308_AEC_MODE2		CCI_REG8(0x0d1)
> +#define GC0308_AEC_MODE3		CCI_REG8(0x0d2)
> +#define GC0308_AEC_TARGET_Y		CCI_REG8(0x0d3)
> +#define GC0308_Y_AVG			CCI_REG8(0x0d4)
> +#define GC0308_AEC_HIGH_LOW_RANGE	CCI_REG8(0x0d5)
> +#define GC0308_AEC_IGNORE		CCI_REG8(0x0d6)
> +#define GC0308_AEC_LIMIT_HIGH_RANGE	CCI_REG8(0x0d7)
> +#define GC0308_AEC_R_OFFSET		CCI_REG8(0x0d9)
> +#define GC0308_AEC_GB_OFFSET		CCI_REG8(0x0da)
> +#define GC0308_AEC_SLOW_MARGIN		CCI_REG8(0x0db)
> +#define GC0308_AEC_FAST_MARGIN		CCI_REG8(0x0dc)
> +#define GC0308_AEC_EXP_CHANGE_GAIN	CCI_REG8(0x0dd)
> +#define GC0308_AEC_STEP2_SUNLIGHT	CCI_REG8(0x0de)
> +#define GC0308_AEC_I_FRAMES		CCI_REG8(0x0df)
> +#define GC0308_AEC_I_STOP_L_MARGIN	CCI_REG8(0x0e0)
> +#define GC0308_AEC_I_STOP_MARGIN	CCI_REG8(0x0e1)
> +#define GC0308_ANTI_FLICKER_STEP	CCI_REG16(0x0e2)
> +#define GC0308_EXP_LVL_1		CCI_REG16(0x0e4)
> +#define GC0308_EXP_LVL_2		CCI_REG16(0x0e6)
> +#define GC0308_EXP_LVL_3		CCI_REG16(0x0e8)
> +#define GC0308_EXP_LVL_4		CCI_REG16(0x0ea)
> +#define GC0308_MAX_EXP_LVL		CCI_REG8(0x0ec)
> +#define GC0308_EXP_MIN_L		CCI_REG8(0x0ed)
> +#define GC0308_MAX_POST_DF_GAIN		CCI_REG8(0x0ee)
> +#define GC0308_MAX_PRE_DG_GAIN		CCI_REG8(0x0ef)
> +
> +/* ABS */
> +#define GC0308_ABS_RANGE_COMP		CCI_REG8(0x0f0)
> +#define GC0308_ABS_STOP_MARGIN		CCI_REG8(0x0f1)
> +#define GC0308_Y_S_COMP			CCI_REG8(0x0f2)
> +#define GC0308_Y_STRETCH_LIMIT		CCI_REG8(0x0f3)
> +#define GC0308_Y_TILT			CCI_REG8(0x0f4)
> +#define GC0308_Y_STRETCH		CCI_REG8(0x0f5)
> +
> +/* Measure Window */
> +#define GC0308_BIG_WIN_X0		CCI_REG8(0x0f7)
> +#define GC0308_BIG_WIN_Y0		CCI_REG8(0x0f8)
> +#define GC0308_BIG_WIN_X1		CCI_REG8(0x0f9)
> +#define GC0308_BIG_WIN_Y1		CCI_REG8(0x0fa)
> +#define GC0308_DIFF_Y_BIG_THD		CCI_REG8(0x0fb)
> +
> +/* OUT Module (P1) */
> +#define GC0308_CLOSE_FRAME_EN		CCI_REG8(0x150)
> +#define GC0308_CLOSE_FRAME_NUM1		CCI_REG8(0x151)
> +#define GC0308_CLOSE_FRAME_NUM2		CCI_REG8(0x152)
> +#define GC0308_BAYER_MODE		CCI_REG8(0x153)
> +#define GC0308_SUBSAMPLE		CCI_REG8(0x154)
> +#define GC0308_SUBMODE			CCI_REG8(0x155)
> +#define GC0308_SUB_ROW_N1		CCI_REG8(0x156)
> +#define GC0308_SUB_ROW_N2		CCI_REG8(0x157)
> +#define GC0308_SUB_COL_N1		CCI_REG8(0x158)
> +#define GC0308_SUB_COL_N2		CCI_REG8(0x159)
> +
> +/* AWB (P1) - Auto White Balance */
> +#define GC0308_AWB_RGB_HIGH_LOW		CCI_REG8(0x100)
> +#define GC0308_AWB_Y_TO_C_DIFF2		CCI_REG8(0x102)
> +#define GC0308_AWB_C_MAX		CCI_REG8(0x104)
> +#define GC0308_AWB_C_INTER		CCI_REG8(0x105)
> +#define GC0308_AWB_C_INTER2		CCI_REG8(0x106)
> +#define GC0308_AWB_C_MAX_BIG		CCI_REG8(0x108)
> +#define GC0308_AWB_Y_HIGH		CCI_REG8(0x109)
> +#define GC0308_AWB_NUMBER_LIMIT		CCI_REG8(0x10a)
> +#define GC0308_KWIN_RATIO		CCI_REG8(0x10b)
> +#define GC0308_KWIN_THD			CCI_REG8(0x10c)
> +#define GC0308_LIGHT_GAIN_RANGE		CCI_REG8(0x10d)
> +#define GC0308_SMALL_WIN_WIDTH_STEP	CCI_REG8(0x10e)
> +#define GC0308_SMALL_WIN_HEIGHT_STEP	CCI_REG8(0x10f)
> +#define GC0308_AWB_YELLOW_TH		CCI_REG8(0x110)
> +#define GC0308_AWB_MODE			CCI_REG8(0x111)
> +#define GC0308_AWB_ADJUST_SPEED		CCI_REG8(0x112)
> +#define GC0308_AWB_EVERY_N		CCI_REG8(0x113)
> +#define GC0308_R_AVG_USE		CCI_REG8(0x1d0)
> +#define GC0308_G_AVG_USE		CCI_REG8(0x1d1)
> +#define GC0308_B_AVG_USE		CCI_REG8(0x1d2)
> +
> +#define GC0308_HBLANK_MIN		0x021
> +#define GC0308_HBLANK_MAX		0xfff
> +#define GC0308_HBLANK_DEF		0x040
> +
> +#define GC0308_VBLANK_MIN		0x000
> +#define GC0308_VBLANK_MAX		0xfff
> +#define GC0308_VBLANK_DEF		0x020
> +
> +#define GC0308_PIXEL_RATE		24000000
> +
> +/*
> + * frame_time = (BT + height + 8) * row_time
> + * width = 640 (driver does not change window size)
> + * height = 480 (driver does not change window size)
> + * row_time = HBLANK + SAMPLE_HOLD_DELAY + width + 8 + 4
> + *
> + * When EXP_TIME > (BT + height):
> + *     BT = EXP_TIME - height - 8 - VS_START_TIME + VS_END_TIME
> + * else:
> + *     BT = VBLANK + VS_START_TIME + VS_END_TIME
> + *
> + * max is 30 FPS
> + *
> + * In my tests frame rate mostly depends on exposure time. Unfortuantely
> + * it's unclear how this is calculated exactly. Also since we enable AEC,
> + * the frame times vary depending on ambient light conditions.
> + */
> +#define GC0308_FRAME_RATE_MAX		30
> +
> +enum gc0308_exp_val {
> +	GC0308_EXP_M4 = 0,
> +	GC0308_EXP_M3,
> +	GC0308_EXP_M2,
> +	GC0308_EXP_M1,
> +	GC0308_EXP_0,
> +	GC0308_EXP_P1,
> +	GC0308_EXP_P2,
> +	GC0308_EXP_P3,
> +	GC0308_EXP_P4,
> +};
> +
> +static const s64 gc0308_exposure_menu[] = {
> +	-4, -3, -2, -1, 0, 1, 2, 3, 4
> +};
> +
> +struct gc0308_exposure {
> +	u8 luma_offset;
> +	u8 aec_target_y;
> +};
> +
> +#define GC0308_EXPOSURE(luma_offset_reg, aec_target_y_reg) \
> +	{ .luma_offset = luma_offset_reg, .aec_target_y = aec_target_y_reg }
> +
> +static const struct gc0308_exposure gc0308_exposure_values[] = {
> +	[GC0308_EXP_M4] = GC0308_EXPOSURE(0xc0, 0x30),
> +	[GC0308_EXP_M3] = GC0308_EXPOSURE(0xd0, 0x38),
> +	[GC0308_EXP_M2] = GC0308_EXPOSURE(0xe0, 0x40),
> +	[GC0308_EXP_M1] = GC0308_EXPOSURE(0xf0, 0x48),
> +	[GC0308_EXP_0]  = GC0308_EXPOSURE(0x08, 0x50),
> +	[GC0308_EXP_P1] = GC0308_EXPOSURE(0x10, 0x5c),
> +	[GC0308_EXP_P2] = GC0308_EXPOSURE(0x20, 0x60),
> +	[GC0308_EXP_P3] = GC0308_EXPOSURE(0x30, 0x68),
> +	[GC0308_EXP_P4] = GC0308_EXPOSURE(0x40, 0x70),
> +};
> +
> +struct gc0308_awb_gains {
> +	u8 r;
> +	u8 g;
> +	u8 b;
> +};
> +
> +#define GC0308_AWB_GAINS(red, green, blue) \
> +	{ .r = red, .g = green, .b = blue }
> +
> +static const struct gc0308_awb_gains gc0308_awb_gains[] = {
> +	[V4L2_WHITE_BALANCE_AUTO]         = GC0308_AWB_GAINS(0x56, 0x40, 0x4a),
> +	[V4L2_WHITE_BALANCE_CLOUDY]       = GC0308_AWB_GAINS(0x8c, 0x50, 0x40),
> +	[V4L2_WHITE_BALANCE_DAYLIGHT]     = GC0308_AWB_GAINS(0x74, 0x52, 0x40),
> +	[V4L2_WHITE_BALANCE_INCANDESCENT] = GC0308_AWB_GAINS(0x48, 0x40, 0x5c),
> +	[V4L2_WHITE_BALANCE_FLUORESCENT]  = GC0308_AWB_GAINS(0x40, 0x42, 0x50),
> +};
> +
> +struct gc0308_format {
> +	u32 code;
> +	u8 regval;
> +};
> +
> +#define GC0308_FORMAT(v4l2_code, gc0308_regval) \
> +	{ .code = v4l2_code, .regval = gc0308_regval }
> +
> +static const struct gc0308_format gc0308_formats[] = {
> +	GC0308_FORMAT(MEDIA_BUS_FMT_UYVY8_2X8, 0x00),
> +	GC0308_FORMAT(MEDIA_BUS_FMT_VYUY8_2X8, 0x01),
> +	GC0308_FORMAT(MEDIA_BUS_FMT_YUYV8_2X8, 0x02),
> +	GC0308_FORMAT(MEDIA_BUS_FMT_YVYU8_2X8, 0x03),
> +	GC0308_FORMAT(MEDIA_BUS_FMT_RGB565_2X8_BE, 0x06),
> +	GC0308_FORMAT(MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE, 0x07),
> +	GC0308_FORMAT(MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE, 0x09),

For your information, in case you might need the _LE format.
I discovered while correcting endianness for the GC2145 sensor,
that they can also do RGB565_2X8_LE formats and looking rapidly
at the G0308 datasheet, it seems to be similar for the G0308.
This is done by setting the bit 5 (first_second_switch) of
the P0:0x29 (bypass_mode) register which should allow you to get
little endian formatting instead of _BE ;-)

Regards,
Alain

> +};
> +
> +struct gc0308_frame_size {
> +	u8 subsample;
> +	u32 width;
> +	u32 height;
> +};
> +
> +#define GC0308_FRAME_SIZE(s, w, h) \
> +	{ .subsample = s, .width = w, .height = h }
> +
> +static const struct gc0308_frame_size gc0308_frame_sizes[] = {
> +	GC0308_FRAME_SIZE(0x11, 640, 480),
> +	GC0308_FRAME_SIZE(0x22, 320, 240),
> +	GC0308_FRAME_SIZE(0x44, 160, 120),
> +};
> +
> +struct gc0308_mode_registers {
> +	u8 out_format;
> +	u8 subsample;
> +	u16 width;
> +	u16 height;
> +};
> +
> +struct gc0308 {
> +	struct v4l2_subdev sd;
> +	struct v4l2_ctrl_handler hdl;
> +	struct media_pad pad;
> +	struct device *dev;
> +	struct clk *clk;
> +	struct regmap *regmap;
> +	struct regulator *vdd;
> +	struct gpio_desc *pwdn_gpio;
> +	struct gpio_desc *reset_gpio;
> +	unsigned int mbus_config;
> +	struct gc0308_mode_registers mode;
> +	struct {
> +		/* mirror cluster */
> +		struct v4l2_ctrl *hflip;
> +		struct v4l2_ctrl *vflip;
> +	};
> +	struct {
> +		/* blanking cluster */
> +		struct v4l2_ctrl *hblank;
> +		struct v4l2_ctrl *vblank;
> +	};
> +};
> +
> +static inline struct gc0308 *to_gc0308(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct gc0308, sd);
> +}
> +
> +static const struct regmap_range_cfg gc0308_ranges[] = {
> +	{
> +		.range_min	= 0x0000,
> +		.range_max	= 0x01ff,
> +		.selector_reg	= 0xfe,
> +		.selector_mask	= 0x01,
> +		.selector_shift	= 0x00,
> +		.window_start	= 0x00,
> +		.window_len	= 0x100,
> +	},
> +};
> +
> +static const struct regmap_config gc0308_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.reg_format_endian = REGMAP_ENDIAN_BIG,
> +	.max_register = 0x1ff,
> +	.ranges = gc0308_ranges,
> +	.num_ranges = ARRAY_SIZE(gc0308_ranges),
> +	.disable_locking = true,
> +};
> +
> +static const struct cci_reg_sequence sensor_default_regs[] = {
> +	{GC0308_VB_HB, 0x00},
> +	{GC0308_HBLANK, 0x40},
> +	{GC0308_VBLANK, 0x20},
> +	{GC0308_EXP, 0x0258},
> +	{GC0308_AWB_R_GAIN, 0x56},
> +	{GC0308_AWB_G_GAIN, 0x40},
> +	{GC0308_AWB_B_GAIN, 0x4a},
> +	{GC0308_ANTI_FLICKER_STEP, 0x0078},
> +	{GC0308_EXP_LVL_1, 0x0258},
> +	{GC0308_EXP_LVL_2, 0x0258},
> +	{GC0308_EXP_LVL_3, 0x0258},
> +	{GC0308_EXP_LVL_4, 0x0ea6},
> +	{GC0308_MAX_EXP_LVL, 0x20},
> +	{GC0308_ROW_START, 0x0000},
> +	{GC0308_COL_START, 0x0000},
> +	{GC0308_WIN_HEIGHT, 488},
> +	{GC0308_WIN_WIDTH, 648},
> +	{GC0308_VS_START_TIME, 0x02},
> +	{GC0308_VS_END_TIME, 0x02},
> +	{GC0308_RSH_WIDTH, 0x22},
> +	{GC0308_TSP_WIDTH, 0x0d},
> +	{GC0308_SAMPLE_HOLD_DELAY, 0x50},
> +	{GC0308_ROW_TAIL_WIDTH, 0x0f},
> +	{GC0308_CISCTL_MODE1, 0x10},
> +	{GC0308_CISCTL_MODE2, 0x0a},
> +	{GC0308_CISCTL_MODE3, 0x05},
> +	{GC0308_CISCTL_MODE4, 0x01},
> +	{CCI_REG8(0x018), 0x44}, /* undocumented */
> +	{CCI_REG8(0x019), 0x44}, /* undocumented */
> +	{GC0308_ANALOG_MODE1, 0x2a},
> +	{GC0308_ANALOG_MODE2, 0x00},
> +	{GC0308_HRST_RSG_V18, 0x49},
> +	{GC0308_VREF_V25, 0x9a},
> +	{GC0308_ADC_R, 0x61},
> +	{GC0308_PAD_DRV, 0x01}, /* drv strength: pclk=4mA */
> +	{GC0308_BLOCK_EN1, 0x7f},
> +	{GC0308_BLOCK_EN2, 0xfa},
> +	{GC0308_AAAA_EN, 0x57},
> +	{GC0308_OUT_FORMAT, 0xa2}, /* YCbYCr */
> +	{GC0308_OUT_EN, 0x0f},
> +	{GC0308_SYNC_MODE, 0x03},
> +	{GC0308_CLK_DIV_MODE, 0x00},
> +	{GC0308_DEBUG_MODE1, 0x0a},
> +	{GC0308_DEBUG_MODE2, 0x00},
> +	{GC0308_DEBUG_MODE3, 0x01},
> +	{GC0308_BLK_MODE, 0xf7},
> +	{GC0308_BLK_LIMIT_VAL, 0x50},
> +	{GC0308_GLOBAL_OFF, 0x00},
> +	{GC0308_CURRENT_R_OFF, 0x28},
> +	{GC0308_CURRENT_G_OFF, 0x2a},
> +	{GC0308_CURRENT_B_OFF, 0x28},
> +	{GC0308_EXP_RATE_DARKC, 0x04},
> +	{GC0308_OFF_SUBMODE, 0x20},
> +	{GC0308_DARKC_SUBMODE, 0x20},
> +	{GC0308_MANUAL_G1_OFF, 0x00},
> +	{GC0308_MANUAL_R1_OFF, 0x00},
> +	{GC0308_MANUAL_B2_OFF, 0x00},
> +	{GC0308_MANUAL_G2_OFF, 0x00},
> +	{GC0308_GLOBAL_GAIN, 0x14},
> +	{GC0308_AUTO_POSTGAIN, 0x41},
> +	{GC0308_CHANNEL_GAIN_G1, 0x80},
> +	{GC0308_CHANNEL_GAIN_R, 0x80},
> +	{GC0308_CHANNEL_GAIN_B, 0x80},
> +	{GC0308_CHANNEL_GAIN_G2, 0x80},
> +	{GC0308_LSC_RED_B2, 0x20},
> +	{GC0308_LSC_GREEN_B2, 0x20},
> +	{GC0308_LSC_BLUE_B2, 0x20},
> +	{GC0308_LSC_RED_B4, 0x14},
> +	{GC0308_LSC_GREEN_B4, 0x10},
> +	{GC0308_LSC_BLUE_B4, 0x14},
> +	{GC0308_LSC_ROW_CENTER, 0x3c},
> +	{GC0308_LSC_COL_CENTER, 0x50},
> +	{GC0308_LSC_DEC_LVL1, 0x12},
> +	{GC0308_LSC_DEC_LVL2, 0x1a},
> +	{GC0308_LSC_DEC_LVL3, 0x24},
> +	{GC0308_DN_MODE_EN, 0x07},
> +	{GC0308_DN_MODE_RATIO, 0x15},
> +	{GC0308_DN_BILAT_B_BASE, 0x08},
> +	{GC0308_DN_BILAT_N_BASE, 0x03},
> +	{GC0308_DD_DARK_BRIGHT_TH, 0xe8},
> +	{GC0308_DD_FLAT_TH, 0x86},
> +	{GC0308_DD_LIMIT, 0x82},
> +	{GC0308_ASDE_GAIN_TRESH, 0x18},
> +	{GC0308_ASDE_GAIN_MODE, 0x0f},
> +	{GC0308_ASDE_DN_SLOPE, 0x00},
> +	{GC0308_ASDE_DD_BRIGHT, 0x5f},
> +	{GC0308_ASDE_DD_LIMIT, 0x8f},
> +	{GC0308_ASDE_AUTO_EE1, 0x55},
> +	{GC0308_ASDE_AUTO_EE2, 0x38},
> +	{GC0308_ASDE_AUTO_SAT_DEC_SLOPE, 0x15},
> +	{GC0308_ASDE_AUTO_SAT_LOW_LIMIT, 0x33},
> +	{GC0308_EEINTP_MODE_1, 0xdc},
> +	{GC0308_EEINTP_MODE_2, 0x00},
> +	{GC0308_DIRECTION_TH1, 0x02},
> +	{GC0308_DIRECTION_TH2, 0x3f},
> +	{GC0308_DIFF_HV_TI_TH, 0x02},
> +	{GC0308_EDGE12_EFFECT, 0x38},
> +	{GC0308_EDGE_POS_RATIO, 0x88},
> +	{GC0308_EDGE1_MINMAX, 0x81},
> +	{GC0308_EDGE2_MINMAX, 0x81},
> +	{GC0308_EDGE12_TH, 0x22},
> +	{GC0308_EDGE_MAX, 0xff},
> +	{GC0308_CC_MATRIX_C11, 0x48},
> +	{GC0308_CC_MATRIX_C12, 0x02},
> +	{GC0308_CC_MATRIX_C13, 0x07},
> +	{GC0308_CC_MATRIX_C21, 0xe0},
> +	{GC0308_CC_MATRIX_C22, 0x40},
> +	{GC0308_CC_MATRIX_C23, 0xf0},
> +	{GC0308_SATURATION_CB, 0x40},
> +	{GC0308_SATURATION_CR, 0x40},
> +	{GC0308_LUMA_CONTRAST, 0x40},
> +	{GC0308_SKIN_CB_CENTER, 0xe0},
> +	{GC0308_EDGE_DEC_SA, 0x38},
> +	{GC0308_AUTO_GRAY_MODE, 0x36},
> +	{GC0308_AEC_MODE1, 0xcb},
> +	{GC0308_AEC_MODE2, 0x10},
> +	{GC0308_AEC_MODE3, 0x90},
> +	{GC0308_AEC_TARGET_Y, 0x48},
> +	{GC0308_AEC_HIGH_LOW_RANGE, 0xf2},
> +	{GC0308_AEC_IGNORE, 0x16},
> +	{GC0308_AEC_SLOW_MARGIN, 0x92},
> +	{GC0308_AEC_FAST_MARGIN, 0xa5},
> +	{GC0308_AEC_I_FRAMES, 0x23},
> +	{GC0308_AEC_R_OFFSET, 0x00},
> +	{GC0308_AEC_GB_OFFSET, 0x00},
> +	{GC0308_AEC_I_STOP_L_MARGIN, 0x09},
> +	{GC0308_EXP_MIN_L, 0x04},
> +	{GC0308_MAX_POST_DF_GAIN, 0xa0},
> +	{GC0308_MAX_PRE_DG_GAIN, 0x40},
> +	{GC0308_ABB_MODE, 0x03},
> +	{GC0308_GAMMA_OUT0, 0x10},
> +	{GC0308_GAMMA_OUT1, 0x20},
> +	{GC0308_GAMMA_OUT2, 0x38},
> +	{GC0308_GAMMA_OUT3, 0x4e},
> +	{GC0308_GAMMA_OUT4, 0x63},
> +	{GC0308_GAMMA_OUT5, 0x76},
> +	{GC0308_GAMMA_OUT6, 0x87},
> +	{GC0308_GAMMA_OUT7, 0xa2},
> +	{GC0308_GAMMA_OUT8, 0xb8},
> +	{GC0308_GAMMA_OUT9, 0xca},
> +	{GC0308_GAMMA_OUT10, 0xd8},
> +	{GC0308_GAMMA_OUT11, 0xe3},
> +	{GC0308_GAMMA_OUT12, 0xeb},
> +	{GC0308_GAMMA_OUT13, 0xf0},
> +	{GC0308_GAMMA_OUT14, 0xf8},
> +	{GC0308_GAMMA_OUT15, 0xfd},
> +	{GC0308_GAMMA_OUT16, 0xff},
> +	{GC0308_Y_GAMMA_OUT0, 0x00},
> +	{GC0308_Y_GAMMA_OUT1, 0x10},
> +	{GC0308_Y_GAMMA_OUT2, 0x1c},
> +	{GC0308_Y_GAMMA_OUT3, 0x30},
> +	{GC0308_Y_GAMMA_OUT4, 0x43},
> +	{GC0308_Y_GAMMA_OUT5, 0x54},
> +	{GC0308_Y_GAMMA_OUT6, 0x65},
> +	{GC0308_Y_GAMMA_OUT7, 0x75},
> +	{GC0308_Y_GAMMA_OUT8, 0x93},
> +	{GC0308_Y_GAMMA_OUT9, 0xb0},
> +	{GC0308_Y_GAMMA_OUT10, 0xcb},
> +	{GC0308_Y_GAMMA_OUT11, 0xe6},
> +	{GC0308_Y_GAMMA_OUT12, 0xff},
> +	{GC0308_ABS_RANGE_COMP, 0x02},
> +	{GC0308_ABS_STOP_MARGIN, 0x01},
> +	{GC0308_Y_S_COMP, 0x02},
> +	{GC0308_Y_STRETCH_LIMIT, 0x30},
> +	{GC0308_BIG_WIN_X0, 0x12},
> +	{GC0308_BIG_WIN_Y0, 0x0a},
> +	{GC0308_BIG_WIN_X1, 0x9f},
> +	{GC0308_BIG_WIN_Y1, 0x78},
> +	{GC0308_AWB_RGB_HIGH_LOW, 0xf5},
> +	{GC0308_AWB_Y_TO_C_DIFF2, 0x20},
> +	{GC0308_AWB_C_MAX, 0x10},
> +	{GC0308_AWB_C_INTER, 0x08},
> +	{GC0308_AWB_C_INTER2, 0x20},
> +	{GC0308_AWB_C_MAX_BIG, 0x0a},
> +	{GC0308_AWB_NUMBER_LIMIT, 0xa0},
> +	{GC0308_KWIN_RATIO, 0x60},
> +	{GC0308_KWIN_THD, 0x08},
> +	{GC0308_SMALL_WIN_WIDTH_STEP, 0x44},
> +	{GC0308_SMALL_WIN_HEIGHT_STEP, 0x32},
> +	{GC0308_AWB_YELLOW_TH, 0x41},
> +	{GC0308_AWB_MODE, 0x37},
> +	{GC0308_AWB_ADJUST_SPEED, 0x22},
> +	{GC0308_AWB_EVERY_N, 0x19},
> +	{CCI_REG8(0x114), 0x44}, /* AWB set1 */
> +	{CCI_REG8(0x115), 0x44}, /* AWB set1 */
> +	{CCI_REG8(0x116), 0xc2}, /* AWB set1 */
> +	{CCI_REG8(0x117), 0xa8}, /* AWB set1 */
> +	{CCI_REG8(0x118), 0x18}, /* AWB set1 */
> +	{CCI_REG8(0x119), 0x50}, /* AWB set1 */
> +	{CCI_REG8(0x11a), 0xd8}, /* AWB set1 */
> +	{CCI_REG8(0x11b), 0xf5}, /* AWB set1 */
> +	{CCI_REG8(0x170), 0x40}, /* AWB set2 */
> +	{CCI_REG8(0x171), 0x58}, /* AWB set2 */
> +	{CCI_REG8(0x172), 0x30}, /* AWB set2 */
> +	{CCI_REG8(0x173), 0x48}, /* AWB set2 */
> +	{CCI_REG8(0x174), 0x20}, /* AWB set2 */
> +	{CCI_REG8(0x175), 0x60}, /* AWB set2 */
> +	{CCI_REG8(0x177), 0x20}, /* AWB set2 */
> +	{CCI_REG8(0x178), 0x32}, /* AWB set2 */
> +	{CCI_REG8(0x130), 0x03}, /* undocumented */
> +	{CCI_REG8(0x131), 0x40}, /* undocumented */
> +	{CCI_REG8(0x132), 0x10}, /* undocumented */
> +	{CCI_REG8(0x133), 0xe0}, /* undocumented */
> +	{CCI_REG8(0x134), 0xe0}, /* undocumented */
> +	{CCI_REG8(0x135), 0x00}, /* undocumented */
> +	{CCI_REG8(0x136), 0x80}, /* undocumented */
> +	{CCI_REG8(0x137), 0x00}, /* undocumented */
> +	{CCI_REG8(0x138), 0x04}, /* undocumented */
> +	{CCI_REG8(0x139), 0x09}, /* undocumented */
> +	{CCI_REG8(0x13a), 0x12}, /* undocumented */
> +	{CCI_REG8(0x13b), 0x1c}, /* undocumented */
> +	{CCI_REG8(0x13c), 0x28}, /* undocumented */
> +	{CCI_REG8(0x13d), 0x31}, /* undocumented */
> +	{CCI_REG8(0x13e), 0x44}, /* undocumented */
> +	{CCI_REG8(0x13f), 0x57}, /* undocumented */
> +	{CCI_REG8(0x140), 0x6c}, /* undocumented */
> +	{CCI_REG8(0x141), 0x81}, /* undocumented */
> +	{CCI_REG8(0x142), 0x94}, /* undocumented */
> +	{CCI_REG8(0x143), 0xa7}, /* undocumented */
> +	{CCI_REG8(0x144), 0xb8}, /* undocumented */
> +	{CCI_REG8(0x145), 0xd6}, /* undocumented */
> +	{CCI_REG8(0x146), 0xee}, /* undocumented */
> +	{CCI_REG8(0x147), 0x0d}, /* undocumented */
> +	{CCI_REG8(0x162), 0xf7}, /* undocumented */
> +	{CCI_REG8(0x163), 0x68}, /* undocumented */
> +	{CCI_REG8(0x164), 0xd3}, /* undocumented */
> +	{CCI_REG8(0x165), 0xd3}, /* undocumented */
> +	{CCI_REG8(0x166), 0x60}, /* undocumented */
> +};
> +
> +struct gc0308_colormode {
> +	u8 special_effect;
> +	u8 dbg_mode1;
> +	u8 block_en1;
> +	u8 aec_mode3;
> +	u8 eeintp_mode_2;
> +	u8 edge12_effect;
> +	u8 luma_contrast;
> +	u8 contrast_center;
> +	u8 fixed_cb;
> +	u8 fixed_cr;
> +};
> +
> +#define GC0308_COLOR_FX(reg_special_effect, reg_dbg_mode1, reg_block_en1, \
> +			reg_aec_mode3, reg_eeintp_mode_2, reg_edge12_effect, \
> +			reg_luma_contrast, reg_contrast_center, \
> +			reg_fixed_cb, reg_fixed_cr) \
> +	{ \
> +		.special_effect = reg_special_effect, \
> +		.dbg_mode1 = reg_dbg_mode1, \
> +		.block_en1 = reg_block_en1, \
> +		.aec_mode3 = reg_aec_mode3, \
> +		.eeintp_mode_2 = reg_eeintp_mode_2, \
> +		.edge12_effect = reg_edge12_effect, \
> +		.luma_contrast = reg_luma_contrast, \
> +		.contrast_center = reg_contrast_center, \
> +		.fixed_cb = reg_fixed_cb, \
> +		.fixed_cr = reg_fixed_cr, \
> +	}
> +
> +static const struct gc0308_colormode gc0308_colormodes[] = {
> +	[V4L2_COLORFX_NONE] =
> +		GC0308_COLOR_FX(0x00, 0x0a, 0xff, 0x90, 0x00,
> +				0x54, 0x3c, 0x80, 0x00, 0x00),
> +	[V4L2_COLORFX_BW] =
> +		GC0308_COLOR_FX(0x02, 0x0a, 0xff, 0x90, 0x00,
> +				0x54, 0x40, 0x80, 0x00, 0x00),
> +	[V4L2_COLORFX_SEPIA] =
> +		GC0308_COLOR_FX(0x02, 0x0a, 0xff, 0x90, 0x00,
> +				0x38, 0x40, 0x80, 0xd0, 0x28),
> +	[V4L2_COLORFX_NEGATIVE] =
> +		GC0308_COLOR_FX(0x01, 0x0a, 0xff, 0x90, 0x00,
> +				0x38, 0x40, 0x80, 0x00, 0x00),
> +	[V4L2_COLORFX_EMBOSS] =
> +		GC0308_COLOR_FX(0x02, 0x0a, 0xbf, 0x10, 0x01,
> +				0x38, 0x40, 0x80, 0x00, 0x00),
> +	[V4L2_COLORFX_SKETCH] =
> +		GC0308_COLOR_FX(0x02, 0x0a, 0xff, 0x10, 0x80,
> +				0x38, 0x80, 0x90, 0x00, 0x00),
> +	[V4L2_COLORFX_SKY_BLUE] =
> +		GC0308_COLOR_FX(0x02, 0x0a, 0xff, 0x90, 0x00,
> +				0x38, 0x40, 0x80, 0x50, 0xe0),
> +	[V4L2_COLORFX_GRASS_GREEN] =
> +		GC0308_COLOR_FX(0x02, 0x0a, 0xff, 0x90, 0x01,
> +				0x38, 0x40, 0x80, 0xc0, 0xc0),
> +	[V4L2_COLORFX_SKIN_WHITEN] =
> +		GC0308_COLOR_FX(0x02, 0x0a, 0xbf, 0x10, 0x01,
> +				0x38, 0x60, 0x40, 0x00, 0x00),
> +};
> +
> +static int gc0308_power_on(struct device *dev)
> +{
> +	struct gc0308 *gc0308 = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = regulator_enable(gc0308->vdd);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(gc0308->clk);
> +	if (ret)
> +		goto clk_fail;
> +
> +	gpiod_set_value_cansleep(gc0308->pwdn_gpio, 0);
> +	usleep_range(10000, 20000);
> +
> +	gpiod_set_value_cansleep(gc0308->reset_gpio, 1);
> +	usleep_range(10000, 20000);
> +	gpiod_set_value_cansleep(gc0308->reset_gpio, 0);
> +	msleep(30);
> +
> +	return 0;
> +
> +clk_fail:
> +	regulator_disable(gc0308->vdd);
> +	return ret;
> +}
> +
> +static int gc0308_power_off(struct device *dev)
> +{
> +	struct gc0308 *gc0308 = dev_get_drvdata(dev);
> +
> +	gpiod_set_value_cansleep(gc0308->pwdn_gpio, 1);
> +	clk_disable_unprepare(gc0308->clk);
> +	regulator_disable(gc0308->vdd);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +static int gc0308_g_register(struct v4l2_subdev *sd,
> +			     struct v4l2_dbg_register *reg)
> +{
> +	struct gc0308 *gc0308 = to_gc0308(sd);
> +
> +	return cci_read(gc0308->regmap, CCI_REG8(reg->reg), &reg->val, NULL);
> +}
> +
> +static int gc0308_s_register(struct v4l2_subdev *sd,
> +			     const struct v4l2_dbg_register *reg)
> +{
> +	struct gc0308 *gc0308 = to_gc0308(sd);
> +
> +	return cci_write(gc0308->regmap, CCI_REG8(reg->reg), reg->val, NULL);
> +}
> +#endif
> +
> +static int gc0308_set_exposure(struct gc0308 *gc0308, enum gc0308_exp_val exp)
> +{
> +	const struct gc0308_exposure *regs = &gc0308_exposure_values[exp];
> +	struct cci_reg_sequence exposure_reg_seq[] = {
> +		{GC0308_LUMA_OFFSET, regs->luma_offset},
> +		{GC0308_AEC_TARGET_Y, regs->aec_target_y},
> +	};
> +
> +	return cci_multi_reg_write(gc0308->regmap, exposure_reg_seq,
> +				   ARRAY_SIZE(exposure_reg_seq), NULL);
> +}
> +
> +static int gc0308_set_awb_mode(struct gc0308 *gc0308,
> +			       enum v4l2_auto_n_preset_white_balance val)
> +{
> +	const struct gc0308_awb_gains *regs = &gc0308_awb_gains[val];
> +	struct cci_reg_sequence awb_reg_seq[] = {
> +		{GC0308_AWB_R_GAIN, regs->r},
> +		{GC0308_AWB_G_GAIN, regs->g},
> +		{GC0308_AWB_B_GAIN, regs->b},
> +	};
> +	int ret;
> +
> +	ret = cci_update_bits(gc0308->regmap, GC0308_AAAA_EN,
> +			      BIT(1), val == V4L2_WHITE_BALANCE_AUTO, NULL);
> +	ret = cci_multi_reg_write(gc0308->regmap, awb_reg_seq,
> +				  ARRAY_SIZE(awb_reg_seq), &ret);
> +
> +	return ret;
> +}
> +
> +static int gc0308_set_colormode(struct gc0308 *gc0308, enum v4l2_colorfx mode)
> +{
> +	const struct gc0308_colormode *regs = &gc0308_colormodes[mode];
> +	struct cci_reg_sequence colormode_reg_seq[] = {
> +		{GC0308_SPECIAL_EFFECT, regs->special_effect},
> +		{GC0308_DEBUG_MODE1, regs->dbg_mode1},
> +		{GC0308_BLOCK_EN1, regs->block_en1},
> +		{GC0308_AEC_MODE3, regs->aec_mode3},
> +		{GC0308_EEINTP_MODE_2, regs->eeintp_mode_2},
> +		{GC0308_EDGE12_EFFECT, regs->edge12_effect},
> +		{GC0308_LUMA_CONTRAST, regs->luma_contrast},
> +		{GC0308_CONTRAST_CENTER, regs->contrast_center},
> +		{GC0308_FIXED_CB, regs->fixed_cb},
> +		{GC0308_FIXED_CR, regs->fixed_cr},
> +	};
> +
> +	return cci_multi_reg_write(gc0308->regmap, colormode_reg_seq,
> +				   ARRAY_SIZE(colormode_reg_seq), NULL);
> +}
> +
> +static int gc0308_set_power_line_freq(struct gc0308 *gc0308, int frequency)
> +{
> +	static const struct cci_reg_sequence pwr_line_50hz[] = {
> +		{GC0308_ANTI_FLICKER_STEP, 0x0078},
> +		{GC0308_EXP_LVL_1, 0x0258},
> +		{GC0308_EXP_LVL_2, 0x0348},
> +		{GC0308_EXP_LVL_3, 0x04b0},
> +		{GC0308_EXP_LVL_4, 0x05a0},
> +	};
> +	static const struct cci_reg_sequence pwr_line_60hz[] = {
> +		{GC0308_ANTI_FLICKER_STEP, 0x0064},
> +		{GC0308_EXP_LVL_1, 0x0258},
> +		{GC0308_EXP_LVL_2, 0x0384},
> +		{GC0308_EXP_LVL_3, 0x04b0},
> +		{GC0308_EXP_LVL_4, 0x05dc},
> +	};
> +
> +	switch (frequency) {
> +	case V4L2_CID_POWER_LINE_FREQUENCY_60HZ:
> +		return cci_multi_reg_write(gc0308->regmap, pwr_line_60hz,
> +					   ARRAY_SIZE(pwr_line_60hz), NULL);
> +	case V4L2_CID_POWER_LINE_FREQUENCY_50HZ:
> +		return cci_multi_reg_write(gc0308->regmap, pwr_line_50hz,
> +					   ARRAY_SIZE(pwr_line_50hz), NULL);
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int gc0308_update_mirror(struct gc0308 *gc0308)
> +{
> +	u8 regval = 0x00;
> +
> +	if (gc0308->vflip->val)
> +		regval |= BIT(1);
> +
> +	if (gc0308->hflip->val)
> +		regval |= BIT(0);
> +
> +	return cci_update_bits(gc0308->regmap, GC0308_CISCTL_MODE1,
> +			       GENMASK(1, 0), regval, NULL);
> +}
> +
> +static int gc0308_update_blanking(struct gc0308 *gc0308)
> +{
> +	u16 vblank = gc0308->vblank->val;
> +	u16 hblank = gc0308->hblank->val;
> +	u8 vbhb = ((vblank >> 4) & 0xf0) | ((hblank >> 8) & 0x0f);
> +	int ret = 0;
> +
> +	cci_write(gc0308->regmap, GC0308_VB_HB, vbhb, &ret);
> +	cci_write(gc0308->regmap, GC0308_HBLANK, hblank & 0xff, &ret);
> +	cci_write(gc0308->regmap, GC0308_VBLANK, vblank & 0xff, &ret);
> +
> +	return ret;
> +}
> +
> +static int _gc0308_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct gc0308 *gc0308 = container_of(ctrl->handler, struct gc0308, hdl);
> +	uint8_t flipval = ctrl->val ? 0xff : 0x00;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_HBLANK:
> +	case V4L2_CID_VBLANK:
> +		return gc0308_update_blanking(gc0308);
> +	case V4L2_CID_VFLIP:
> +	case V4L2_CID_HFLIP:
> +		return gc0308_update_mirror(gc0308);
> +	case V4L2_CID_AUTO_WHITE_BALANCE:
> +		return cci_update_bits(gc0308->regmap, GC0308_AAAA_EN,
> +				       BIT(1), flipval, NULL);
> +	case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
> +		return gc0308_set_awb_mode(gc0308, ctrl->val);
> +	case V4L2_CID_POWER_LINE_FREQUENCY:
> +		return gc0308_set_power_line_freq(gc0308, ctrl->val);
> +	case V4L2_CID_COLORFX:
> +		return gc0308_set_colormode(gc0308, ctrl->val);
> +	case V4L2_CID_TEST_PATTERN:
> +		return cci_update_bits(gc0308->regmap, GC0308_DEBUG_MODE2,
> +				       GENMASK(1, 0), ctrl->val, NULL);
> +	case V4L2_CID_AUTO_EXPOSURE_BIAS:
> +		return gc0308_set_exposure(gc0308, ctrl->val);
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int gc0308_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct gc0308 *gc0308 = container_of(ctrl->handler, struct gc0308, hdl);
> +	int ret;
> +
> +	if (!pm_runtime_get_if_in_use(gc0308->dev))
> +		return 0;
> +
> +	ret = _gc0308_s_ctrl(ctrl);
> +
> +	if (ret)
> +		dev_err(gc0308->dev, "failed to set control: %d\n", ret);
> +
> +	pm_runtime_mark_last_busy(gc0308->dev);
> +	pm_runtime_put_autosuspend(gc0308->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops gc0308_ctrl_ops = {
> +	.s_ctrl = gc0308_s_ctrl,
> +};
> +
> +static const struct v4l2_subdev_core_ops gc0308_core_ops = {
> +	.log_status = v4l2_ctrl_subdev_log_status,
> +	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> +	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +	.g_register	= gc0308_g_register,
> +	.s_register	= gc0308_s_register,
> +#endif
> +};
> +
> +static int gc0308_enum_mbus_code(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_state *sd_state,
> +				 struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index >= ARRAY_SIZE(gc0308_formats))
> +		return -EINVAL;
> +
> +	code->code = gc0308_formats[code->index].code;
> +
> +	return 0;
> +}
> +
> +static bool gc0308_is_valid_format(u32 code)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(gc0308_formats); i++) {
> +		if (gc0308_formats[i].code == code)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +static int gc0308_enum_frame_size(struct v4l2_subdev *subdev,
> +				  struct v4l2_subdev_state *sd_state,
> +				  struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	if (fse->index >= ARRAY_SIZE(gc0308_frame_sizes))
> +		return -EINVAL;
> +
> +	if (!gc0308_is_valid_format(fse->code))
> +		return -EINVAL;
> +
> +	fse->min_width = gc0308_frame_sizes[fse->index].width;
> +	fse->max_width = gc0308_frame_sizes[fse->index].width;
> +	fse->min_height = gc0308_frame_sizes[fse->index].height;
> +	fse->max_height = gc0308_frame_sizes[fse->index].height;
> +
> +	return 0;
> +}
> +
> +static void gc0308_update_pad_format(const struct gc0308_frame_size *mode,
> +				     struct v4l2_mbus_framefmt *fmt, u32 code)
> +{
> +	fmt->width = mode->width;
> +	fmt->height = mode->height;
> +	fmt->code = code;
> +	fmt->field = V4L2_FIELD_NONE;
> +	fmt->colorspace = V4L2_COLORSPACE_SRGB;
> +}
> +
> +static int gc0308_set_format(struct v4l2_subdev *sd,
> +			     struct v4l2_subdev_state *sd_state,
> +			     struct v4l2_subdev_format *fmt)
> +{
> +	struct gc0308 *gc0308 = to_gc0308(sd);
> +	const struct gc0308_frame_size *mode;
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(gc0308_formats); i++) {
> +		if (fmt->format.code == gc0308_formats[i].code)
> +			break;
> +	}
> +
> +	if (i >= ARRAY_SIZE(gc0308_formats)) {
> +		dev_warn(gc0308->dev, "unsupported format code: %08x\n",
> +			 fmt->format.code);
> +		i = 0;
> +	}
> +
> +	mode = v4l2_find_nearest_size(gc0308_frame_sizes,
> +				      ARRAY_SIZE(gc0308_frame_sizes), width,
> +				      height, fmt->format.width,
> +				      fmt->format.height);
> +
> +	gc0308_update_pad_format(mode, &fmt->format, gc0308_formats[i].code);
> +	*v4l2_subdev_get_pad_format(sd, sd_state, fmt->pad) = fmt->format;
> +
> +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
> +		return 0;
> +
> +	gc0308->mode.out_format = gc0308_formats[i].regval;
> +	gc0308->mode.subsample = mode->subsample;
> +	gc0308->mode.width = mode->width;
> +	gc0308->mode.height = mode->height;
> +
> +	return 0;
> +}
> +
> +static int gc0308_init_cfg(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_state *sd_state)
> +{
> +	struct v4l2_mbus_framefmt *format =
> +		v4l2_subdev_get_try_format(sd, sd_state, 0);
> +
> +	format->width		= 640;
> +	format->height		= 480;
> +	format->code		= gc0308_formats[0].code;
> +	format->colorspace	= V4L2_COLORSPACE_SRGB;
> +	format->field		= V4L2_FIELD_NONE;
> +	format->ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT;
> +	format->quantization	= V4L2_QUANTIZATION_DEFAULT;
> +	format->xfer_func	= V4L2_XFER_FUNC_DEFAULT;
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_subdev_pad_ops gc0308_pad_ops = {
> +	.init_cfg = gc0308_init_cfg,
> +	.enum_mbus_code = gc0308_enum_mbus_code,
> +	.enum_frame_size = gc0308_enum_frame_size,
> +	.get_fmt = v4l2_subdev_get_fmt,
> +	.set_fmt = gc0308_set_format,
> +};
> +
> +static int gc0308_set_resolution(struct gc0308 *gc0308, int *ret)
> +{
> +	struct cci_reg_sequence resolution_regs[] = {
> +		{GC0308_SUBSAMPLE, gc0308->mode.subsample},
> +		{GC0308_SUBMODE, 0x03},
> +		{GC0308_SUB_ROW_N1, 0x00},
> +		{GC0308_SUB_ROW_N2, 0x00},
> +		{GC0308_SUB_COL_N1, 0x00},
> +		{GC0308_SUB_COL_N2, 0x00},
> +		{GC0308_CROP_WIN_MODE, 0x80},
> +		{GC0308_CROP_WIN_Y1, 0x00},
> +		{GC0308_CROP_WIN_X1, 0x00},
> +		{GC0308_CROP_WIN_HEIGHT, gc0308->mode.height},
> +		{GC0308_CROP_WIN_WIDTH, gc0308->mode.width},
> +	};
> +
> +	return cci_multi_reg_write(gc0308->regmap, resolution_regs,
> +				   ARRAY_SIZE(resolution_regs), ret);
> +}
> +
> +static int gc0308_start_stream(struct gc0308 *gc0308)
> +{
> +	int ret, sync_mode;
> +
> +	ret = pm_runtime_resume_and_get(gc0308->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	cci_multi_reg_write(gc0308->regmap, sensor_default_regs,
> +			    ARRAY_SIZE(sensor_default_regs), &ret);
> +	cci_update_bits(gc0308->regmap, GC0308_OUT_FORMAT,
> +			GENMASK(4, 0), gc0308->mode.out_format, &ret);
> +	gc0308_set_resolution(gc0308, &ret);
> +
> +	if (ret) {
> +		dev_err(gc0308->dev, "failed to update registers: %d\n", ret);
> +		goto disable_pm;
> +	}
> +
> +	ret = __v4l2_ctrl_handler_setup(&gc0308->hdl);
> +	if (ret) {
> +		dev_err(gc0308->dev, "failed to setup controls\n");
> +		goto disable_pm;
> +	}
> +
> +	/* HSYNC/VSYNC polarity */
> +	sync_mode = 0x3;
> +	if (gc0308->mbus_config & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> +		sync_mode &= ~BIT(0);
> +	if (gc0308->mbus_config & V4L2_MBUS_HSYNC_ACTIVE_LOW)
> +		sync_mode &= ~BIT(1);
> +	ret = cci_write(gc0308->regmap, GC0308_SYNC_MODE, sync_mode, NULL);
> +	if (ret)
> +		goto disable_pm;
> +
> +	return 0;
> +
> +disable_pm:
> +	pm_runtime_mark_last_busy(gc0308->dev);
> +	pm_runtime_put_autosuspend(gc0308->dev);
> +	return ret;
> +}
> +
> +static int gc0308_stop_stream(struct gc0308 *gc0308)
> +{
> +	pm_runtime_mark_last_busy(gc0308->dev);
> +	pm_runtime_put_autosuspend(gc0308->dev);
> +	return 0;
> +}
> +
> +static int gc0308_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> +	struct gc0308 *gc0308 = to_gc0308(sd);
> +	struct v4l2_subdev_state *sd_state;
> +	int ret;
> +
> +	sd_state = v4l2_subdev_lock_and_get_active_state(sd);
> +
> +	if (enable)
> +		ret = gc0308_start_stream(gc0308);
> +	else
> +		ret = gc0308_stop_stream(gc0308);
> +
> +	v4l2_subdev_unlock_state(sd_state);
> +	return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops gc0308_video_ops = {
> +	.s_stream		= gc0308_s_stream,
> +};
> +
> +static const struct v4l2_subdev_ops gc0308_subdev_ops = {
> +	.core	= &gc0308_core_ops,
> +	.pad	= &gc0308_pad_ops,
> +	.video	= &gc0308_video_ops,
> +};
> +
> +static int gc0308_bus_config(struct gc0308 *gc0308)
> +{
> +	struct device *dev = gc0308->dev;
> +	struct v4l2_fwnode_endpoint bus_cfg = {
> +		.bus_type = V4L2_MBUS_PARALLEL
> +	};
> +	struct fwnode_handle *ep;
> +	int ret;
> +
> +	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
> +	if (!ep)
> +		return -EINVAL;
> +
> +	ret = v4l2_fwnode_endpoint_parse(ep, &bus_cfg);
> +	fwnode_handle_put(ep);
> +	if (ret)
> +		return ret;
> +
> +	gc0308->mbus_config = bus_cfg.bus.parallel.flags;
> +
> +	return 0;
> +}
> +
> +static const char * const gc0308_test_pattern_menu[] = {
> +	"Disabled",
> +	"Test Image 1",
> +	"Test Image 2",
> +};
> +
> +static int gc0308_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct gc0308 *gc0308;
> +	unsigned long clkrate;
> +	u64 regval;
> +	int ret;
> +
> +	gc0308 = devm_kzalloc(dev, sizeof(*gc0308), GFP_KERNEL);
> +	if (!gc0308)
> +		return -ENOMEM;
> +
> +	gc0308->dev = dev;
> +	dev_set_drvdata(dev, gc0308);
> +
> +	ret = gc0308_bus_config(gc0308);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to get bus config\n");
> +
> +	gc0308->clk = devm_clk_get_optional(dev, NULL);
> +	if (IS_ERR(gc0308->clk))
> +		return dev_err_probe(dev, PTR_ERR(gc0308->clk),
> +				     "could not get clk\n");
> +
> +	gc0308->vdd = devm_regulator_get(dev, "vdd28");
> +	if (IS_ERR(gc0308->vdd))
> +		return dev_err_probe(dev, PTR_ERR(gc0308->vdd),
> +				     "failed to get vdd28 regulator\n");
> +
> +	gc0308->pwdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
> +	if (IS_ERR(gc0308->pwdn_gpio))
> +		return dev_err_probe(dev, PTR_ERR(gc0308->pwdn_gpio),
> +				     "failed to get powerdown gpio\n");
> +
> +	gc0308->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(gc0308->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(gc0308->reset_gpio),
> +				     "failed to get reset gpio\n");
> +
> +	/*
> +	 * This is not using devm_cci_regmap_init_i2c(), because the driver
> +	 * makes use of regmap's pagination feature. The chosen settings are
> +	 * compatible with the CCI helpers.
> +	 */
> +	gc0308->regmap = devm_regmap_init_i2c(client, &gc0308_regmap_config);
> +	if (IS_ERR(gc0308->regmap))
> +		return dev_err_probe(dev, PTR_ERR(gc0308->regmap),
> +				     "failed to init regmap\n");
> +
> +	v4l2_i2c_subdev_init(&gc0308->sd, client, &gc0308_subdev_ops);
> +	gc0308->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	gc0308->sd.flags |= V4L2_SUBDEV_FL_HAS_EVENTS;
> +
> +	v4l2_ctrl_handler_init(&gc0308->hdl, 11);
> +	gc0308->hblank = v4l2_ctrl_new_std(&gc0308->hdl, &gc0308_ctrl_ops,
> +					   V4L2_CID_HBLANK, GC0308_HBLANK_MIN,
> +					   GC0308_HBLANK_MAX, 1,
> +					   GC0308_HBLANK_DEF);
> +	gc0308->vblank = v4l2_ctrl_new_std(&gc0308->hdl, &gc0308_ctrl_ops,
> +					   V4L2_CID_VBLANK, GC0308_VBLANK_MIN,
> +					   GC0308_VBLANK_MAX, 1,
> +					   GC0308_VBLANK_DEF);
> +	gc0308->hflip = v4l2_ctrl_new_std(&gc0308->hdl, &gc0308_ctrl_ops,
> +					  V4L2_CID_HFLIP, 0, 1, 1, 0);
> +	gc0308->vflip = v4l2_ctrl_new_std(&gc0308->hdl, &gc0308_ctrl_ops,
> +					  V4L2_CID_VFLIP, 0, 1, 1, 0);
> +	v4l2_ctrl_new_std(&gc0308->hdl, &gc0308_ctrl_ops, V4L2_CID_PIXEL_RATE,
> +			  GC0308_PIXEL_RATE, GC0308_PIXEL_RATE, 1,
> +			  GC0308_PIXEL_RATE);
> +	v4l2_ctrl_new_std(&gc0308->hdl, &gc0308_ctrl_ops,
> +			  V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
> +	v4l2_ctrl_new_std_menu_items(&gc0308->hdl, &gc0308_ctrl_ops,
> +				     V4L2_CID_TEST_PATTERN,
> +				     ARRAY_SIZE(gc0308_test_pattern_menu) - 1,
> +				     0, 0, gc0308_test_pattern_menu);
> +	v4l2_ctrl_new_std_menu(&gc0308->hdl, &gc0308_ctrl_ops,
> +			       V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE,
> +			       8, ~0x14e, V4L2_WHITE_BALANCE_AUTO);
> +	v4l2_ctrl_new_std_menu(&gc0308->hdl, &gc0308_ctrl_ops,
> +			       V4L2_CID_COLORFX, 8, 0, V4L2_COLORFX_NONE);
> +	v4l2_ctrl_new_std_menu(&gc0308->hdl, &gc0308_ctrl_ops,
> +			       V4L2_CID_POWER_LINE_FREQUENCY,
> +			       V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
> +			       ~0x6, V4L2_CID_POWER_LINE_FREQUENCY_50HZ);
> +	v4l2_ctrl_new_int_menu(&gc0308->hdl, &gc0308_ctrl_ops,
> +			       V4L2_CID_AUTO_EXPOSURE_BIAS,
> +			       ARRAY_SIZE(gc0308_exposure_menu) - 1,
> +			       ARRAY_SIZE(gc0308_exposure_menu)/2,
> +			       gc0308_exposure_menu);
> +
> +	gc0308->sd.ctrl_handler = &gc0308->hdl;
> +	if (gc0308->hdl.error) {
> +		ret = gc0308->hdl.error;
> +		goto fail_ctrl_hdl_cleanup;
> +	}
> +
> +	v4l2_ctrl_cluster(2, &gc0308->hflip);
> +	v4l2_ctrl_cluster(2, &gc0308->hblank);
> +
> +	gc0308->sd.state_lock = gc0308->hdl.lock;
> +	gc0308->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	gc0308->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	ret = media_entity_pads_init(&gc0308->sd.entity, 1, &gc0308->pad);
> +	if (ret < 0)
> +		goto fail_ctrl_hdl_cleanup;
> +
> +	ret = v4l2_subdev_init_finalize(&gc0308->sd);
> +	if (ret)
> +		goto fail_media_entity_cleanup;
> +
> +	ret = gc0308_power_on(dev);
> +	if (ret)
> +		goto fail_subdev_cleanup;
> +
> +	if (gc0308->clk) {
> +		clkrate = clk_get_rate(gc0308->clk);
> +		if (clkrate != 24000000)
> +			dev_warn(dev, "unexpected clock rate: %lu\n", clkrate);
> +	}
> +
> +	ret = cci_read(gc0308->regmap, GC0308_CHIP_ID, &regval, NULL);
> +	if (ret < 0) {
> +		dev_err_probe(dev, ret, "failed to read chip ID\n");
> +		goto fail_power_off;
> +	}
> +
> +	if (regval != 0x9b) {
> +		ret = -EINVAL;
> +		dev_err_probe(dev, ret, "invalid chip ID (%02llx)\n", regval);
> +		goto fail_power_off;
> +	}
> +
> +	ret = v4l2_async_register_subdev(&gc0308->sd);
> +	if (ret) {
> +		dev_err_probe(dev, ret, "failed to register v4l subdev\n");
> +		goto fail_power_off;
> +	}
> +
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +	pm_runtime_set_autosuspend_delay(&client->dev, 1000);
> +	pm_runtime_use_autosuspend(&client->dev);
> +	pm_runtime_idle(dev);
> +
> +	return 0;
> +
> +fail_power_off:
> +	gc0308_power_off(dev);
> +fail_subdev_cleanup:
> +	v4l2_subdev_cleanup(&gc0308->sd);
> +fail_media_entity_cleanup:
> +	media_entity_cleanup(&gc0308->sd.entity);
> +fail_ctrl_hdl_cleanup:
> +	v4l2_ctrl_handler_free(&gc0308->hdl);
> +	return ret;
> +}
> +
> +static void gc0308_remove(struct i2c_client *client)
> +{
> +	struct gc0308 *gc0308 = i2c_get_clientdata(client);
> +	struct device *dev = &client->dev;
> +
> +	pm_runtime_get_sync(dev);
> +
> +	v4l2_async_unregister_subdev(&gc0308->sd);
> +	v4l2_ctrl_handler_free(&gc0308->hdl);
> +
> +	pm_runtime_disable(dev);
> +	pm_runtime_set_suspended(dev);
> +	pm_runtime_put_noidle(dev);
> +	gc0308_power_off(dev);
> +}
> +
> +static const struct dev_pm_ops gc0308_pm_ops = {
> +	SET_RUNTIME_PM_OPS(gc0308_power_off, gc0308_power_on, NULL)
> +};
> +
> +static const struct of_device_id gc0308_of_match[] = {
> +	{ .compatible = "galaxycore,gc0308" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, gc0308_of_match);
> +
> +static struct i2c_driver gc0308_i2c_driver = {
> +	.driver = {
> +		.name  = "gc0308",
> +		.pm = &gc0308_pm_ops,
> +		.of_match_table = gc0308_of_match,
> +	},
> +	.probe  = gc0308_probe,
> +	.remove = gc0308_remove,
> +};
> +module_i2c_driver(gc0308_i2c_driver);
> +
> +MODULE_DESCRIPTION("GalaxyCore GC0308 Camera Driver");
> +MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
> +MODULE_LICENSE("GPL");
> -- 
> 2.42.0
>