media: i2c: mt9t112: Remove soc_camera dependencies

Remove soc_camera framework dependencies from mt9t112 sensor driver.
- Handle clk, gpios and power routines
- Register async subdev
- Remove deprecated g/s_mbus_config operations
- Remove driver flags
- Change driver interface and add kernel doc
- Adjust build system
- Fix code style issues reported by checkpatch in strict mode

This commit does not remove the original soc_camera based driver as long
as other platforms depends on soc_camera framework.

As I don't have access to a working camera module, this change has only
been compile tested.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

5 files changed, 210 insertions, 224 deletions

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index d7bba0e3f30e..541f0d28afd8 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -788,6 +788,17 @@ config VIDEO_MT9T001
 	  This is a Video4Linux2 sensor-level driver for the Aptina
 	  (Micron) mt0t001 3 Mpixel camera.
 
+config VIDEO_MT9T112
+	tristate "Aptina MT9T111/MT9T112 support"
+	depends on I2C && VIDEO_V4L2
+	depends on MEDIA_CAMERA_SUPPORT
+	---help---
+	  This is a Video4Linux2 sensor-level driver for the Aptina
+	  (Micron) MT9T111 and MT9T112 3 Mpixel camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called mt9t112.
+
 config VIDEO_MT9V011
 	tristate "Micron mt9v011 sensor support"
 	depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index cc30178e3347..ea34aee1a85a 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -80,6 +80,7 @@ obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o
 obj-$(CONFIG_VIDEO_MT9M111) += mt9m111.o
 obj-$(CONFIG_VIDEO_MT9P031) += mt9p031.o
 obj-$(CONFIG_VIDEO_MT9T001) += mt9t001.o
+obj-$(CONFIG_VIDEO_MT9T112) += mt9t112.o
 obj-$(CONFIG_VIDEO_MT9V011) += mt9v011.o
 obj-$(CONFIG_VIDEO_MT9V032) += mt9v032.o
 obj-$(CONFIG_VIDEO_SR030PC30)	+= sr030pc30.o
diff --git a/drivers/media/i2c/mt9t112.c b/drivers/media/i2c/mt9t112.c
index 297d22ebcb18..af8cca984215 100644
--- a/drivers/media/i2c/mt9t112.c
+++ b/drivers/media/i2c/mt9t112.c
@@ -1,6 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * mt9t112 Camera Driver
  *
+ * Copyright (C) 2018 Jacopo Mondi <jacopo+renesas@jmondi.org>
+ *
  * Copyright (C) 2009 Renesas Solutions Corp.
  * Kuninori Morimoto <morimoto.kuninori@renesas.com>
  *
@@ -12,12 +15,14 @@
  * Copyright (C) 2008 Magnus Damm
  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * TODO: This driver lacks support for frame rate control due to missing
+ *	 register level documentation and suitable hardware for testing.
+ *	 v4l-utils compliance tools will report errors.
  */
 
+#include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -26,17 +31,16 @@
 #include <linux/videodev2.h>
 
 #include <media/i2c/mt9t112.h>
-#include <media/soc_camera.h>
-#include <media/v4l2-clk.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-image-sizes.h>
+#include <media/v4l2-subdev.h>
 
 /* you can check PLL/clock info */
 /* #define EXT_CLOCK 24000000 */
 
 /************************************************************************
-			macro
-************************************************************************/
+ *			macro
+ ***********************************************************************/
 /*
  * frame size
  */
@@ -74,8 +78,8 @@
 #define VAR8(id, offset) _VAR(id, offset, 0x8000)
 
 /************************************************************************
-			struct
-************************************************************************/
+ *			struct
+ ***********************************************************************/
 struct mt9t112_format {
 	u32 code;
 	enum v4l2_colorspace colorspace;
@@ -85,21 +89,19 @@ struct mt9t112_format {
 
 struct mt9t112_priv {
 	struct v4l2_subdev		 subdev;
-	struct mt9t112_camera_info	*info;
+	struct mt9t112_platform_data	*info;
 	struct i2c_client		*client;
 	struct v4l2_rect		 frame;
-	struct v4l2_clk			*clk;
+	struct clk			*clk;
+	struct gpio_desc		*standby_gpio;
 	const struct mt9t112_format	*format;
 	int				 num_formats;
-	u32				 flags;
-/* for flags */
-#define INIT_DONE	(1 << 0)
-#define PCLK_RISING	(1 << 1)
+	bool				 init_done;
 };
 
 /************************************************************************
-			supported format
-************************************************************************/
+ *			supported format
+ ***********************************************************************/
 
 static const struct mt9t112_format mt9t112_cfmts[] = {
 	{
@@ -136,8 +138,8 @@ static const struct mt9t112_format mt9t112_cfmts[] = {
 };
 
 /************************************************************************
-			general function
-************************************************************************/
+ *			general function
+ ***********************************************************************/
 static struct mt9t112_priv *to_mt9t112(const struct i2c_client *client)
 {
 	return container_of(i2c_get_clientdata(client),
@@ -164,15 +166,15 @@ static int __mt9t112_reg_read(const struct i2c_client *client, u16 command)
 	msg[1].buf   = buf;
 
 	/*
-	 * if return value of this function is < 0,
-	 * it mean error.
-	 * else, under 16bit is valid data.
+	 * If return value of this function is < 0, it means error, else,
+	 * below 16bit is valid data.
 	 */
 	ret = i2c_transfer(client->adapter, msg, 2);
 	if (ret < 0)
 		return ret;
 
 	memcpy(&ret, buf, 2);
+
 	return swab16(ret);
 }
 
@@ -195,22 +197,19 @@ static int __mt9t112_reg_write(const struct i2c_client *client,
 	msg.buf   = buf;
 
 	/*
-	 * i2c_transfer return message length,
-	 * but this function should return 0 if correct case
+	 * i2c_transfer return message length, but this function should
+	 * return 0 if correct case.
 	 */
 	ret = i2c_transfer(client->adapter, &msg, 1);
-	if (ret >= 0)
-		ret = 0;
 
-	return ret;
+	return ret >= 0 ? 0 : ret;
 }
 
 static int __mt9t112_reg_mask_set(const struct i2c_client *client,
-				  u16  command,
-				  u16  mask,
-				  u16  set)
+				  u16  command, u16  mask, u16  set)
 {
 	int val = __mt9t112_reg_read(client, command);
+
 	if (val < 0)
 		return val;
 
@@ -245,11 +244,10 @@ static int __mt9t112_mcu_write(const struct i2c_client *client,
 }
 
 static int __mt9t112_mcu_mask_set(const struct i2c_client *client,
-				  u16  command,
-				  u16  mask,
-				  u16  set)
+				  u16  command, u16  mask, u16  set)
 {
 	int val = __mt9t112_mcu_read(client, command);
+
 	if (val < 0)
 		return val;
 
@@ -264,7 +262,7 @@ static int mt9t112_reset(const struct i2c_client *client)
 	int ret;
 
 	mt9t112_reg_mask_set(ret, client, 0x001a, 0x0001, 0x0001);
-	msleep(1);
+	usleep_range(1000, 5000);
 	mt9t112_reg_mask_set(ret, client, 0x001a, 0x0001, 0x0000);
 
 	return ret;
@@ -303,71 +301,64 @@ static int mt9t112_clock_info(const struct i2c_client *client, u32 ext)
 	m = n & 0x00ff;
 	n = (n >> 8) & 0x003f;
 
-	enable = ((6000 > ext) || (54000 < ext)) ? "X" : "";
+	enable = ((ext < 6000) || (ext > 54000)) ? "X" : "";
 	dev_dbg(&client->dev, "EXTCLK          : %10u K %s\n", ext, enable);
 
-	vco = 2 * m * ext / (n+1);
-	enable = ((384000 > vco) || (768000 < vco)) ? "X" : "";
+	vco = 2 * m * ext / (n + 1);
+	enable = ((vco < 384000) || (vco > 768000)) ? "X" : "";
 	dev_dbg(&client->dev, "VCO             : %10u K %s\n", vco, enable);
 
-	clk = vco / (p1+1) / (p2+1);
-	enable = (96000 < clk) ? "X" : "";
+	clk = vco / (p1 + 1) / (p2 + 1);
+	enable = (clk > 96000) ? "X" : "";
 	dev_dbg(&client->dev, "PIXCLK          : %10u K %s\n", clk, enable);
 
-	clk = vco / (p3+1);
-	enable = (768000 < clk) ? "X" : "";
+	clk = vco / (p3 + 1);
+	enable = (clk > 768000) ? "X" : "";
 	dev_dbg(&client->dev, "MIPICLK         : %10u K %s\n", clk, enable);
 
-	clk = vco / (p6+1);
-	enable = (96000 < clk) ? "X" : "";
+	clk = vco / (p6 + 1);
+	enable = (clk > 96000) ? "X" : "";
 	dev_dbg(&client->dev, "MCU CLK         : %10u K %s\n", clk, enable);
 
-	clk = vco / (p5+1);
-	enable = (54000 < clk) ? "X" : "";
+	clk = vco / (p5 + 1);
+	enable = (clk > 54000) ? "X" : "";
 	dev_dbg(&client->dev, "SOC CLK         : %10u K %s\n", clk, enable);
 
-	clk = vco / (p4+1);
-	enable = (70000 < clk) ? "X" : "";
+	clk = vco / (p4 + 1);
+	enable = (clk > 70000) ? "X" : "";
 	dev_dbg(&client->dev, "Sensor CLK      : %10u K %s\n", clk, enable);
 
-	clk = vco / (p7+1);
+	clk = vco / (p7 + 1);
 	dev_dbg(&client->dev, "External sensor : %10u K\n", clk);
 
-	clk = ext / (n+1);
-	enable = ((2000 > clk) || (24000 < clk)) ? "X" : "";
+	clk = ext / (n + 1);
+	enable = ((clk < 2000) || (clk > 24000)) ? "X" : "";
 	dev_dbg(&client->dev, "PFD             : %10u K %s\n", clk, enable);
 
 	return 0;
 }
 #endif
 
-static void mt9t112_frame_check(u32 *width, u32 *height, u32 *left, u32 *top)
-{
-	soc_camera_limit_side(left, width, 0, 0, MAX_WIDTH);
-	soc_camera_limit_side(top, height, 0, 0, MAX_HEIGHT);
-}
-
 static int mt9t112_set_a_frame_size(const struct i2c_client *client,
-				   u16 width,
-				   u16 height)
+				    u16 width, u16 height)
 {
 	int ret;
 	u16 wstart = (MAX_WIDTH - width) / 2;
 	u16 hstart = (MAX_HEIGHT - height) / 2;
 
-	/* (Context A) Image Width/Height */
+	/* (Context A) Image Width/Height. */
 	mt9t112_mcu_write(ret, client, VAR(26, 0), width);
 	mt9t112_mcu_write(ret, client, VAR(26, 2), height);
 
-	/* (Context A) Output Width/Height */
+	/* (Context A) Output Width/Height. */
 	mt9t112_mcu_write(ret, client, VAR(18, 43), 8 + width);
 	mt9t112_mcu_write(ret, client, VAR(18, 45), 8 + height);
 
-	/* (Context A) Start Row/Column */
+	/* (Context A) Start Row/Column. */
 	mt9t112_mcu_write(ret, client, VAR(18, 2), 4 + hstart);
 	mt9t112_mcu_write(ret, client, VAR(18, 4), 4 + wstart);
 
-	/* (Context A) End Row/Column */
+	/* (Context A) End Row/Column. */
 	mt9t112_mcu_write(ret, client, VAR(18, 6), 11 + height + hstart);
 	mt9t112_mcu_write(ret, client, VAR(18, 8), 11 + width  + wstart);
 
@@ -377,35 +368,27 @@ static int mt9t112_set_a_frame_size(const struct i2c_client *client,
 }
 
 static int mt9t112_set_pll_dividers(const struct i2c_client *client,
-				    u8 m, u8 n,
-				    u8 p1, u8 p2, u8 p3,
-				    u8 p4, u8 p5, u8 p6,
-				    u8 p7)
+				    u8 m, u8 n, u8 p1, u8 p2, u8 p3, u8 p4,
+				    u8 p5, u8 p6, u8 p7)
 {
 	int ret;
 	u16 val;
 
 	/* N/M */
-	val = (n << 8) |
-	      (m << 0);
+	val = (n << 8) | (m << 0);
 	mt9t112_reg_mask_set(ret, client, 0x0010, 0x3fff, val);
 
 	/* P1/P2/P3 */
-	val = ((p3 & 0x0F) << 8) |
-	      ((p2 & 0x0F) << 4) |
-	      ((p1 & 0x0F) << 0);
+	val = ((p3 & 0x0F) << 8) | ((p2 & 0x0F) << 4) | ((p1 & 0x0F) << 0);
 	mt9t112_reg_mask_set(ret, client, 0x0012, 0x0fff, val);
 
 	/* P4/P5/P6 */
-	val = (0x7         << 12) |
-	      ((p6 & 0x0F) <<  8) |
-	      ((p5 & 0x0F) <<  4) |
+	val = (0x7 << 12) | ((p6 & 0x0F) <<  8) | ((p5 & 0x0F) <<  4) |
 	      ((p4 & 0x0F) <<  0);
 	mt9t112_reg_mask_set(ret, client, 0x002A, 0x7fff, val);
 
 	/* P7 */
-	val = (0x1         << 12) |
-	      ((p7 & 0x0F) <<  0);
+	val = (0x1 << 12) | ((p7 & 0x0F) <<  0);
 	mt9t112_reg_mask_set(ret, client, 0x002C, 0x100f, val);
 
 	return ret;
@@ -418,19 +401,15 @@ static int mt9t112_init_pll(const struct i2c_client *client)
 
 	mt9t112_reg_mask_set(ret, client, 0x0014, 0x003, 0x0001);
 
-	/* PLL control: BYPASS PLL = 8517 */
+	/* PLL control: BYPASS PLL = 8517. */
 	mt9t112_reg_write(ret, client, 0x0014, 0x2145);
 
-	/* Replace these registers when new timing parameters are generated */
+	/* Replace these registers when new timing parameters are generated. */
 	mt9t112_set_pll_dividers(client,
-				 priv->info->divider.m,
-				 priv->info->divider.n,
-				 priv->info->divider.p1,
-				 priv->info->divider.p2,
-				 priv->info->divider.p3,
-				 priv->info->divider.p4,
-				 priv->info->divider.p5,
-				 priv->info->divider.p6,
+				 priv->info->divider.m, priv->info->divider.n,
+				 priv->info->divider.p1, priv->info->divider.p2,
+				 priv->info->divider.p3, priv->info->divider.p4,
+				 priv->info->divider.p5, priv->info->divider.p6,
 				 priv->info->divider.p7);
 
 	/*
@@ -452,20 +431,21 @@ static int mt9t112_init_pll(const struct i2c_client *client)
 	 * I2C Master Clock Divider
 	 */
 	mt9t112_reg_write(ret, client, 0x0014, 0x3046);
-	mt9t112_reg_write(ret, client, 0x0016, 0x0400); /* JPEG initialization workaround */
+	/* JPEG initialization workaround */
+	mt9t112_reg_write(ret, client, 0x0016, 0x0400);
 	mt9t112_reg_write(ret, client, 0x0022, 0x0190);
 	mt9t112_reg_write(ret, client, 0x3B84, 0x0212);
 
-	/* External sensor clock is PLL bypass */
+	/* External sensor clock is PLL bypass. */
 	mt9t112_reg_write(ret, client, 0x002E, 0x0500);
 
 	mt9t112_reg_mask_set(ret, client, 0x0018, 0x0002, 0x0002);
 	mt9t112_reg_mask_set(ret, client, 0x3B82, 0x0004, 0x0004);
 
-	/* MCU disabled */
+	/* MCU disabled. */
 	mt9t112_reg_mask_set(ret, client, 0x0018, 0x0004, 0x0004);
 
-	/* out of standby */
+	/* Out of standby. */
 	mt9t112_reg_mask_set(ret, client, 0x0018, 0x0001, 0);
 
 	mdelay(50);
@@ -487,10 +467,10 @@ static int mt9t112_init_pll(const struct i2c_client *client)
 	mt9t112_reg_write(ret, client, 0x0614, 0x0001);
 	mdelay(1);
 
-	/* poll to verify out of standby. Must Poll this bit */
+	/* Poll to verify out of standby. Must Poll this bit. */
 	for (i = 0; i < 100; i++) {
 		mt9t112_reg_read(data, client, 0x0018);
-		if (!(0x4000 & data))
+		if (!(data & 0x4000))
 			break;
 
 		mdelay(10);
@@ -501,7 +481,6 @@ static int mt9t112_init_pll(const struct i2c_client *client)
 
 static int mt9t112_init_setting(const struct i2c_client *client)
 {
-
 	int ret;
 
 	/* Adaptive Output Clock (A) */
@@ -562,11 +541,11 @@ static int mt9t112_init_setting(const struct i2c_client *client)
 	mt9t112_mcu_write(ret, client, VAR(18, 109), 0x0AF0);
 
 	/*
-	 * Flicker Dectection registers
-	 * This section should be replaced whenever new Timing file is generated
-	 * All the following registers need to be replaced
+	 * Flicker Dectection registers.
+	 * This section should be replaced whenever new timing file is
+	 * generated. All the following registers need to be replaced.
 	 * Following registers are generated from Register Wizard but user can
-	 * modify them. For detail see auto flicker detection tuning
+	 * modify them. For detail see auto flicker detection tuning.
 	 */
 
 	/* FD_FDPERIOD_SELECT */
@@ -579,47 +558,47 @@ static int mt9t112_init_setting(const struct i2c_client *client)
 	mt9t112_mcu_write(ret, client, VAR(26, 17), 0x0003);
 
 	/*
-	 * AFD range detection tuning registers
+	 * AFD range detection tuning registers.
 	 */
 
-	/* search_f1_50 */
+	/* Search_f1_50 */
 	mt9t112_mcu_write(ret, client, VAR8(18, 165), 0x25);
 
-	/* search_f2_50 */
+	/* Search_f2_50 */
 	mt9t112_mcu_write(ret, client, VAR8(18, 166), 0x28);
 
-	/* search_f1_60 */
+	/* Search_f1_60 */
 	mt9t112_mcu_write(ret, client, VAR8(18, 167), 0x2C);
 
-	/* search_f2_60 */
+	/* Search_f2_60 */
 	mt9t112_mcu_write(ret, client, VAR8(18, 168), 0x2F);
 
-	/* period_50Hz (A) */
+	/* Period_50Hz (A) */
 	mt9t112_mcu_write(ret, client, VAR8(18, 68), 0xBA);
 
-	/* secret register by aptina */
-	/* period_50Hz (A MSB) */
+	/* Secret register by Aptina. */
+	/* Period_50Hz (A MSB) */
 	mt9t112_mcu_write(ret, client, VAR8(18, 303), 0x00);
 
-	/* period_60Hz (A) */
+	/* Period_60Hz (A) */
 	mt9t112_mcu_write(ret, client, VAR8(18, 69), 0x9B);
 
-	/* secret register by aptina */
-	/* period_60Hz (A MSB) */
+	/* Secret register by Aptina. */
+	/* Period_60Hz (A MSB) */
 	mt9t112_mcu_write(ret, client, VAR8(18, 301), 0x00);
 
-	/* period_50Hz (B) */
+	/* Period_50Hz (B) */
 	mt9t112_mcu_write(ret, client, VAR8(18, 140), 0x82);
 
-	/* secret register by aptina */
-	/* period_50Hz (B) MSB */
+	/* Secret register by Aptina. */
+	/* Period_50Hz (B) MSB */
 	mt9t112_mcu_write(ret, client, VAR8(18, 304), 0x00);
 
-	/* period_60Hz (B) */
+	/* Period_60Hz (B) */
 	mt9t112_mcu_write(ret, client, VAR8(18, 141), 0x6D);
 
-	/* secret register by aptina */
-	/* period_60Hz (B) MSB */
+	/* Secret register by Aptina. */
+	/* Period_60Hz (B) MSB */
 	mt9t112_mcu_write(ret, client, VAR8(18, 302), 0x00);
 
 	/* FD Mode */
@@ -693,49 +672,50 @@ static int mt9t112_init_camera(const struct i2c_client *client)
 	int ret;
 
 	ECHECKER(ret, mt9t112_reset(client));
-
 	ECHECKER(ret, mt9t112_init_pll(client));
-
 	ECHECKER(ret, mt9t112_init_setting(client));
-
 	ECHECKER(ret, mt9t112_auto_focus_setting(client));
 
 	mt9t112_reg_mask_set(ret, client, 0x0018, 0x0004, 0);
 
-	/* Analog setting B */
+	/* Analog setting B.*/
 	mt9t112_reg_write(ret, client, 0x3084, 0x2409);
 	mt9t112_reg_write(ret, client, 0x3092, 0x0A49);
 	mt9t112_reg_write(ret, client, 0x3094, 0x4949);
 	mt9t112_reg_write(ret, client, 0x3096, 0x4950);
 
 	/*
-	 * Disable adaptive clock
+	 * Disable adaptive clock.
 	 * PRI_A_CONFIG_JPEG_OB_TX_CONTROL_VAR
 	 * PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR
 	 */
 	mt9t112_mcu_write(ret, client, VAR(26, 160), 0x0A2E);
 	mt9t112_mcu_write(ret, client, VAR(27, 160), 0x0A2E);
 
-	/* Configure STatus in Status_before_length Format and enable header */
-	/* PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR */
+	/*
+	 * Configure Status in Status_before_length Format and enable header.
+	 * PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR
+	 */
 	mt9t112_mcu_write(ret, client, VAR(27, 144), 0x0CB4);
 
-	/* Enable JPEG in context B */
-	/* PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR */
+	/*
+	 * Enable JPEG in context B.
+	 * PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR
+	 */
 	mt9t112_mcu_write(ret, client, VAR8(27, 142), 0x01);
 
-	/* Disable Dac_TXLO */
+	/* Disable Dac_TXLO. */
 	mt9t112_reg_write(ret, client, 0x316C, 0x350F);
 
-	/* Set max slew rates */
+	/* Set max slew rates. */
 	mt9t112_reg_write(ret, client, 0x1E, 0x777);
 
 	return ret;
 }
 
 /************************************************************************
-			v4l2_subdev_core_ops
-************************************************************************/
+ *			v4l2_subdev_core_ops
+ ***********************************************************************/
 
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 static int mt9t112_g_register(struct v4l2_subdev *sd,
@@ -764,13 +744,40 @@ static int mt9t112_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int mt9t112_power_on(struct mt9t112_priv *priv)
+{
+	int ret;
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret)
+		return ret;
+
+	if (priv->standby_gpio) {
+		gpiod_set_value(priv->standby_gpio, 0);
+		msleep(100);
+	}
+
+	return 0;
+}
+
+static int mt9t112_power_off(struct mt9t112_priv *priv)
+{
+	clk_disable_unprepare(priv->clk);
+	if (priv->standby_gpio) {
+		gpiod_set_value(priv->standby_gpio, 1);
+		msleep(100);
+	}
+
+	return 0;
+}
+
 static int mt9t112_s_power(struct v4l2_subdev *sd, int on)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 	struct mt9t112_priv *priv = to_mt9t112(client);
 
-	return soc_camera_set_power(&client->dev, ssdd, priv->clk, on);
+	return on ? mt9t112_power_on(priv) :
+		    mt9t112_power_off(priv);
 }
 
 static const struct v4l2_subdev_core_ops mt9t112_subdev_core_ops = {
@@ -781,10 +788,9 @@ static const struct v4l2_subdev_core_ops mt9t112_subdev_core_ops = {
 	.s_power	= mt9t112_s_power,
 };
 
-
 /************************************************************************
-			v4l2_subdev_video_ops
-************************************************************************/
+ *			v4l2_subdev_video_ops
+ **********************************************************************/
 static int mt9t112_s_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -794,8 +800,7 @@ static int mt9t112_s_stream(struct v4l2_subdev *sd, int enable)
 	if (!enable) {
 		/* FIXME
 		 *
-		 * If user selected large output size,
-		 * and used it long time,
+		 * If user selected large output size, and used it long time,
 		 * mt9t112 camera will be very warm.
 		 *
 		 * But current driver can not stop mt9t112 camera.
@@ -805,26 +810,25 @@ static int mt9t112_s_stream(struct v4l2_subdev *sd, int enable)
 		return ret;
 	}
 
-	if (!(priv->flags & INIT_DONE)) {
-		u16 param = PCLK_RISING & priv->flags ? 0x0001 : 0x0000;
+	if (!priv->init_done) {
+		u16 param = MT9T112_FLAG_PCLK_RISING_EDGE & priv->info->flags ?
+			    0x0001 : 0x0000;
 
 		ECHECKER(ret, mt9t112_init_camera(client));
 
-		/* Invert PCLK (Data sampled on falling edge of pixclk) */
+		/* Invert PCLK (Data sampled on falling edge of pixclk). */
 		mt9t112_reg_write(ret, client, 0x3C20, param);
 
 		mdelay(5);
 
-		priv->flags |= INIT_DONE;
+		priv->init_done = true;
 	}
 
 	mt9t112_mcu_write(ret, client, VAR(26, 7), priv->format->fmt);
 	mt9t112_mcu_write(ret, client, VAR(26, 9), priv->format->order);
 	mt9t112_mcu_write(ret, client, VAR8(1, 0), 0x06);
 
-	mt9t112_set_a_frame_size(client,
-				 priv->frame.width,
-				 priv->frame.height);
+	mt9t112_set_a_frame_size(client, priv->frame.width, priv->frame.height);
 
 	ECHECKER(ret, mt9t112_auto_focus_trigger(client));
 
@@ -854,13 +858,13 @@ static int mt9t112_set_params(struct mt9t112_priv *priv,
 	if (i == priv->num_formats)
 		return -EINVAL;
 
-	priv->frame  = *rect;
+	priv->frame = *rect;
 
 	/*
 	 * frame size check
 	 */
-	mt9t112_frame_check(&priv->frame.width, &priv->frame.height,
-			    &priv->frame.left, &priv->frame.top);
+	v4l_bound_align_image(&priv->frame.width, 0, MAX_WIDTH, 0,
+			      &priv->frame.height, 0, MAX_HEIGHT, 0, 0);
 
 	priv->format = mt9t112_cfmts + i;
 
@@ -868,7 +872,7 @@ static int mt9t112_set_params(struct mt9t112_priv *priv,
 }
 
 static int mt9t112_get_selection(struct v4l2_subdev *sd,
-		struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_pad_config *cfg,
 		struct v4l2_subdev_selection *sel)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -899,8 +903,8 @@ static int mt9t112_get_selection(struct v4l2_subdev *sd,
 }
 
 static int mt9t112_set_selection(struct v4l2_subdev *sd,
-		struct v4l2_subdev_pad_config *cfg,
-		struct v4l2_subdev_selection *sel)
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_selection *sel)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	struct mt9t112_priv *priv = to_mt9t112(client);
@@ -914,8 +918,8 @@ static int mt9t112_set_selection(struct v4l2_subdev *sd,
 }
 
 static int mt9t112_get_fmt(struct v4l2_subdev *sd,
-		struct v4l2_subdev_pad_config *cfg,
-		struct v4l2_subdev_format *format)
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *format)
 {
 	struct v4l2_mbus_framefmt *mf = &format->format;
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -955,13 +959,12 @@ static int mt9t112_s_fmt(struct v4l2_subdev *sd,
 }
 
 static int mt9t112_set_fmt(struct v4l2_subdev *sd,
-		struct v4l2_subdev_pad_config *cfg,
-		struct v4l2_subdev_format *format)
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *format)
 {
-	struct v4l2_mbus_framefmt *mf = &format->format;
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct v4l2_mbus_framefmt *mf = &format->format;
 	struct mt9t112_priv *priv = to_mt9t112(client);
-	unsigned int top, left;
 	int i;
 
 	if (format->pad)
@@ -975,22 +978,24 @@ static int mt9t112_set_fmt(struct v4l2_subdev *sd,
 		mf->code = MEDIA_BUS_FMT_UYVY8_2X8;
 		mf->colorspace = V4L2_COLORSPACE_JPEG;
 	} else {
-		mf->colorspace	= mt9t112_cfmts[i].colorspace;
+		mf->colorspace = mt9t112_cfmts[i].colorspace;
 	}
 
-	mt9t112_frame_check(&mf->width, &mf->height, &left, &top);
+	v4l_bound_align_image(&mf->width, 0, MAX_WIDTH, 0,
+			      &mf->height, 0, MAX_HEIGHT, 0, 0);
 
 	mf->field = V4L2_FIELD_NONE;
 
 	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 		return mt9t112_s_fmt(sd, mf);
 	cfg->try_fmt = *mf;
+
 	return 0;
 }
 
 static int mt9t112_enum_mbus_code(struct v4l2_subdev *sd,
-		struct v4l2_subdev_pad_config *cfg,
-		struct v4l2_subdev_mbus_code_enum *code)
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_mbus_code_enum *code)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	struct mt9t112_priv *priv = to_mt9t112(client);
@@ -1003,42 +1008,12 @@ static int mt9t112_enum_mbus_code(struct v4l2_subdev *sd,
 	return 0;
 }
 
-static int mt9t112_g_mbus_config(struct v4l2_subdev *sd,
-				 struct v4l2_mbus_config *cfg)
-{
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
-
-	cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
-		V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH |
-		V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
-	cfg->type = V4L2_MBUS_PARALLEL;
-	cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
-
-	return 0;
-}
-
-static int mt9t112_s_mbus_config(struct v4l2_subdev *sd,
-				 const struct v4l2_mbus_config *cfg)
-{
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
-	struct mt9t112_priv *priv = to_mt9t112(client);
-
-	if (soc_camera_apply_board_flags(ssdd, cfg) & V4L2_MBUS_PCLK_SAMPLE_RISING)
-		priv->flags |= PCLK_RISING;
-
-	return 0;
-}
-
 static const struct v4l2_subdev_video_ops mt9t112_subdev_video_ops = {
 	.s_stream	= mt9t112_s_stream,
-	.g_mbus_config	= mt9t112_g_mbus_config,
-	.s_mbus_config	= mt9t112_s_mbus_config,
 };
 
 static const struct v4l2_subdev_pad_ops mt9t112_subdev_pad_ops = {
-	.enum_mbus_code = mt9t112_enum_mbus_code,
+	.enum_mbus_code	= mt9t112_enum_mbus_code,
 	.get_selection	= mt9t112_get_selection,
 	.set_selection	= mt9t112_set_selection,
 	.get_fmt	= mt9t112_get_fmt,
@@ -1046,8 +1021,8 @@ static const struct v4l2_subdev_pad_ops mt9t112_subdev_pad_ops = {
 };
 
 /************************************************************************
-			i2c driver
-************************************************************************/
+ *			i2c driver
+ ***********************************************************************/
 static const struct v4l2_subdev_ops mt9t112_subdev_ops = {
 	.core	= &mt9t112_subdev_core_ops,
 	.video	= &mt9t112_subdev_video_ops,
@@ -1065,9 +1040,7 @@ static int mt9t112_camera_probe(struct i2c_client *client)
 	if (ret < 0)
 		return ret;
 
-	/*
-	 * check and show chip ID
-	 */
+	/* Check and show chip ID. */
 	mt9t112_reg_read(chipid, client, 0x0000);
 
 	switch (chipid) {
@@ -1089,6 +1062,7 @@ static int mt9t112_camera_probe(struct i2c_client *client)
 
 done:
 	mt9t112_s_power(&priv->subdev, 0);
+
 	return ret;
 }
 
@@ -1096,16 +1070,9 @@ static int mt9t112_probe(struct i2c_client *client,
 			 const struct i2c_device_id *did)
 {
 	struct mt9t112_priv *priv;
-	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
-	struct v4l2_rect rect = {
-		.width = VGA_WIDTH,
-		.height = VGA_HEIGHT,
-		.left = (MAX_WIDTH - VGA_WIDTH) / 2,
-		.top = (MAX_HEIGHT - VGA_HEIGHT) / 2,
-	};
 	int ret;
 
-	if (!ssdd || !ssdd->drv_priv) {
+	if (!client->dev.platform_data) {
 		dev_err(&client->dev, "mt9t112: missing platform data!\n");
 		return -EINVAL;
 	}
@@ -1114,30 +1081,40 @@ static int mt9t112_probe(struct i2c_client *client,
 	if (!priv)
 		return -ENOMEM;
 
-	priv->info = ssdd->drv_priv;
+	priv->info = client->dev.platform_data;
+	priv->init_done = false;
 
 	v4l2_i2c_subdev_init(&priv->subdev, client, &mt9t112_subdev_ops);
 
-	priv->clk = v4l2_clk_get(&client->dev, "mclk");
-	if (IS_ERR(priv->clk))
+	priv->clk = devm_clk_get(&client->dev, "extclk");
+	if (PTR_ERR(priv->clk) == -ENOENT) {
+		priv->clk = NULL;
+	} else if (IS_ERR(priv->clk)) {
+		dev_err(&client->dev, "Unable to get clock \"extclk\"\n");
 		return PTR_ERR(priv->clk);
+	}
 
-	ret = mt9t112_camera_probe(client);
+	priv->standby_gpio = devm_gpiod_get_optional(&client->dev, "standby",
+						     GPIOD_OUT_HIGH);
+	if (IS_ERR(priv->standby_gpio)) {
+		dev_err(&client->dev, "Unable to get gpio \"standby\"\n");
+		return PTR_ERR(priv->standby_gpio);
+	}
 
-	/* Cannot fail: using the default supported pixel code */
-	if (!ret)
-		mt9t112_set_params(priv, &rect, MEDIA_BUS_FMT_UYVY8_2X8);
-	else
-		v4l2_clk_put(priv->clk);
+	ret = mt9t112_camera_probe(client);
+	if (ret)
+		return ret;
 
-	return ret;
+	return v4l2_async_register_subdev(&priv->subdev);
 }
 
 static int mt9t112_remove(struct i2c_client *client)
 {
 	struct mt9t112_priv *priv = to_mt9t112(client);
 
-	v4l2_clk_put(priv->clk);
+	clk_disable_unprepare(priv->clk);
+	v4l2_async_unregister_subdev(&priv->subdev);
+
 	return 0;
 }
 
@@ -1158,6 +1135,6 @@ static struct i2c_driver mt9t112_i2c_driver = {
 
 module_i2c_driver(mt9t112_i2c_driver);
 
-MODULE_DESCRIPTION("SoC Camera driver for mt9t112");
+MODULE_DESCRIPTION("V4L2 driver for MT9T111/MT9T112 camera sensor");
 MODULE_AUTHOR("Kuninori Morimoto");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/media/i2c/soc_camera/mt9t112.c b/drivers/media/i2c/soc_camera/mt9t112.c
index 297d22ebcb18..b53c36dfa469 100644
--- a/drivers/media/i2c/soc_camera/mt9t112.c
+++ b/drivers/media/i2c/soc_camera/mt9t112.c
@@ -85,7 +85,7 @@ struct mt9t112_format {
 
 struct mt9t112_priv {
 	struct v4l2_subdev		 subdev;
-	struct mt9t112_camera_info	*info;
+	struct mt9t112_platform_data	*info;
 	struct i2c_client		*client;
 	struct v4l2_rect		 frame;
 	struct v4l2_clk			*clk;
diff --git a/include/media/i2c/mt9t112.h b/include/media/i2c/mt9t112.h
index a43c74ab05ec..cc80d5cc2104 100644
--- a/include/media/i2c/mt9t112.h
+++ b/include/media/i2c/mt9t112.h
@@ -1,28 +1,25 @@
+/*  SPDX-License-Identifier: GPL-2.0 */
 /* mt9t112 Camera
  *
  * Copyright (C) 2009 Renesas Solutions Corp.
  * Kuninori Morimoto <morimoto.kuninori@renesas.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #ifndef __MT9T112_H__
 #define __MT9T112_H__
 
-#define MT9T112_FLAG_PCLK_RISING_EDGE	(1 << 0)
-#define MT9T112_FLAG_DATAWIDTH_8	(1 << 1) /* default width is 10 */
-
 struct mt9t112_pll_divider {
 	u8 m, n;
 	u8 p1, p2, p3, p4, p5, p6, p7;
 };
 
-/*
- * mt9t112 camera info
+/**
+ * mt9t112_platform_data -	mt9t112 driver interface
+ * @flags:			Sensor media bus configuration.
+ * @divider:			Sensor PLL configuration
  */
-struct mt9t112_camera_info {
+struct mt9t112_platform_data {
+#define MT9T112_FLAG_PCLK_RISING_EDGE	BIT(0)
 	u32 flags;
 	struct mt9t112_pll_divider divider;
 };