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Thu, 16 Jul 2020 05:02:47 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:48420 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726333AbgGPJCn (ORCPT ); Thu, 16 Jul 2020 05:02:43 -0400 Received: from [192.168.0.20] (cpc89242-aztw30-2-0-cust488.18-1.cable.virginm.net [86.31.129.233]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id C098E2B7; Thu, 16 Jul 2020 11:02:30 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1594890151; bh=ckCB5KEToa5cnwOQPOrsqLosW5okyrJDad8sEZzU/fQ=; h=Reply-To:Subject:To:Cc:References:From:Date:In-Reply-To:From; b=bfd6TQPRwMISXqTTtBJcuUWthFSZZM7GlEnYnOZjBLeZoihUNWCrAyGk3/nyN35ic 2qEP7f/qBRUOJJVK9PwYQAHZ/1J8J7fAbj77usY3YThCyIyw7bU7tkAzkPxAGynFuB 7C5ThoDdvv3JKP231O0tvm5F9dIzcW89/1wJt5L8= Reply-To: kieran.bingham@ideasonboard.com Subject: Re: [PATCH v10 2/4] media: i2c: Add MAX9286 driver To: Kieran Bingham , linux-renesas-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , sakari.ailus@iki.fi Cc: Laurent Pinchart , Jacopo Mondi , =?UTF-8?Q?Niklas_S=c3=b6derlund?= , Hans Verkuil , Hyun Kwon , Manivannan Sadhasivam , Rob Herring , Linus Walleij , Jacopo Mondi , Laurent Pinchart , =?UTF-8?Q?Niklas_S=c3=b6derlund?= References: <20200612144713.502006-1-kieran.bingham+renesas@ideasonboard.com> <20200612144713.502006-3-kieran.bingham+renesas@ideasonboard.com> From: Kieran Bingham Autocrypt: addr=kieran.bingham@ideasonboard.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200612144713.502006-3-kieran.bingham+renesas@ideasonboard.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Hi Sakari, This is the output of checkpatch --strict on this driver. Sorry for not detailing this in the commit or cover letter. > ./patches/gmsl/v10/v10-0001-dt-bindings-media-i2c-Add-bindings-for-Maxim-Int.patch has style problems, please review. > -------------------------------------------------------------- > ./patches/gmsl/v10/v10-0002-media-i2c-Add-MAX9286-driver.patch > -------------------------------------------------------------- > CHECK: Prefer using the BIT macro > #246: FILE: drivers/media/i2c/max9286.c:40: > +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) > > CHECK: Prefer using the BIT macro > #251: FILE: drivers/media/i2c/max9286.c:45: > +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) > > CHECK: Prefer using the BIT macro > #262: FILE: drivers/media/i2c/max9286.c:56: > +#define MAX9286_EDC_6BIT_CRC (1 << 5) > > CHECK: Prefer using the BIT macro > #268: FILE: drivers/media/i2c/max9286.c:62: > +#define MAX9286_HVSRC_D14 (1 << 0) > > CHECK: Prefer using the BIT macro > #286: FILE: drivers/media/i2c/max9286.c:80: > +#define MAX9286_DATATYPE_RGB565 (1 << 0) > > CHECK: Prefer using the BIT macro > #304: FILE: drivers/media/i2c/max9286.c:98: > +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) > > CHECK: Prefer using the BIT macro > #312: FILE: drivers/media/i2c/max9286.c:106: > +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) > > CHECK: Prefer using the BIT macro > #316: FILE: drivers/media/i2c/max9286.c:110: > +#define MAX9286_I2CSLVTO_256US (1 << 0) None of those are appropriate to use the BIT() macro, as they are all entries of a specific field with a shift, such as: #define MAX9286_FSYNCMODE_ECU (3 << 6) #define MAX9286_FSYNCMODE_EXT (2 << 6) #define MAX9286_FSYNCMODE_INT_OUT (1 << 6) #define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) Checkpatch is only picking up on the "1 << x" variant of each entry. > CHECK: Macro argument reuse 'source' - possible side-effects? > #399: FILE: drivers/media/i2c/max9286.c:193: > +#define for_each_source(priv, source) \ > + for ((source) = NULL; ((source) = next_source((priv), (source))); ) This warns against possible side effects, but the 're-use' effects are desired ;-) If you'd prefer this macro to be re-written please let me know. > CHECK: Lines should not end with a '(' > #1372: FILE: drivers/media/i2c/max9286.c:1166: > + ret = v4l2_fwnode_endpoint_parse( Full code block: > ret = v4l2_fwnode_endpoint_parse( > of_fwnode_handle(node), &vep); > if (ret) { > of_node_put(node); > return ret; > } That one is awkward, and I chose to keep it as a lesser evil. Of course now that we can officially go up to 120 chars, I could move this line up. If you'd like this to be moved to a single line now we can go over 80 chars, please confirm. > > CHECK: Lines should not end with a '(' > #1398: FILE: drivers/media/i2c/max9286.c:1192: > + source->fwnode = fwnode_graph_get_remote_endpoint( Same here, it was unavoidable to go over 80 chars, so this was the break point. If you would now like to join these lines, I can do so. > > total: 0 errors, 0 warnings, 11 checks, 1362 lines checked -- Kieran On 12/06/2020 15:47, Kieran Bingham wrote: > The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and > CSI-2 output. The device supports multicamera streaming applications, > and features the ability to synchronise the attached cameras. > > CSI-2 output can be configured with 1 to 4 lanes, and a control channel > is supported over I2C, which implements an I2C mux to facilitate > communications with connected cameras across the reverse control > channel. > > Signed-off-by: Jacopo Mondi > Signed-off-by: Kieran Bingham > Signed-off-by: Laurent Pinchart > Signed-off-by: Niklas Söderlund > > -- > v2: > - Fix MAINTAINERS entry > > This posting is released with the following modifications to work > without Sakari's VC developments: > - max9286_g_mbus_config() re-instated > - max9286_get_frame_desc() is not bus/csi aware > - max9286_{get,set}_routing() removed > > v3: > - Initialise notifier with v4l2_async_notifier_init > - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY > > v4: - Re-introduce required code to function with the VC series. > > - Implement max9286_get_routing, max9286_set_routing > - Remove max9286_g_mbus_config > > v5: (internal release) > - Fix printk formatting for hex value > - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) > - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE > - Remove 'device is bound' workaround > > v6: > - v4l2_subdev_krouting instead of v4l2_subdev_routing separated > to allow integration without the VC/V4L2-Mux series. > - convert sd_to_max9286 to inline function > - rename max9286_device to max9286_priv > - Cleanup the v4l2_async_notifier > - Extend MODULE_AUTHOR > - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id > - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) > - Use new YAML file reference in MAINTAINERS > - Parse new i2c-mux node in max9286_get_i2c_by_id > (This could/should be refactored to parse these separately first) > - Spelling and calculation fixes in the FSYNC_LOCKED check comments > - Identify each enabled i2c-mux channel in a single pass > - max9286: Improve mux-state readbility [v2] > - Fix frame sync lock durations > - Add comment to describe /why/ we must open the mux in s_stream > - use -EXDEV as return code for failed link synchronisation. > - Fix reference counting of the dt nodeS > - Convert to probe_new for I2C > - Remove redundant max9286_i2c_mux_state > - Provide optional enable-gpio (max9286-pwdn) > > v7: > [Kieran] > - Ensure powerdown lines are optional > - Add a 4ms power-up delay > - Add max9286_check_config_link() to core > - Add GPIO chip controller for GPIO0OUT and GPIO1OUT > - Fix GPIO registration > - max9286: Split out async registration > (fixes regulator -EPROBE_DEFERs failures) > - Collect all V4L2 registrations > - balance v4l2_async refcnting > - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ > > [Jacopo] > - Remove redundanct MAXIM_I2C_SPEED macros > - Move notifiers operations > - Add delay after reverse channel reconfiguration > - Move link setup to completion > - Fix up max9286_check_config_link() implementation > - Remove redundant dual configuration of reverse channel > > v8: > > [Kieran] > - Update the bound_sources mask on unbind > - Convert probe kzalloc usage to devm_ variant > - Fix up cleanup path from GPIO PowerDown registration > - cleanup GPIO device registration fail path > - Convert to use devm_regulator_get() > - Fit max9286_parse_dt print on one line > - Move multi-device workarounds out of upstream driver > - Remove I2C mod-table > - Lock format changes > - Describe pad index usage > - Remove poc_enabled workaround > - Rename the max9286_gpio to be more explicit on it's actions. > - Move max9286_init_format call > - Rework probe sequence and simplify error paths. > - Simplify i2c comments > - Implement Pixelrate control > - Disable overlap window > > [Jacopo] > - Adapt Kconfig to latest upstream changes > - Put of node on error > - Calculate pixel rate > - Simplify overlap window disablement > > v9: > > [Kieran] > - Kconfig: Depend on OF > - Re-sort addition to Makefile > > v10: > > [Kieran] > - Use the same default mbus_fmt everywhere > - Don't provide GPIO names > - Fix dev->of_node refcnting > - Fix whitespace indent > - Use single sample per pixel > - Remove redundant DPHY check > - Remove redundant v4l2_fwnode_endpoint_free call > - Validate link formats > --- > MAINTAINERS | 10 + > drivers/media/i2c/Kconfig | 13 + > drivers/media/i2c/Makefile | 1 + > drivers/media/i2c/max9286.c | 1320 +++++++++++++++++++++++++++++++++++ > 4 files changed, 1344 insertions(+) > create mode 100644 drivers/media/i2c/max9286.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 791d2a862e41..7534df72033f 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst > F: drivers/hwmon/max6697.c > F: include/linux/platform_data/max6697.h > > +MAX9286 QUAD GMSL DESERIALIZER DRIVER > +M: Jacopo Mondi > +M: Kieran Bingham > +M: Laurent Pinchart > +M: Niklas Söderlund > +L: linux-media@vger.kernel.org > +S: Maintained > +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > +F: drivers/media/i2c/max9286.c > + > MAX9860 MONO AUDIO VOICE CODEC DRIVER > M: Peter Rosin > L: alsa-devel@alsa-project.org (moderated for non-subscribers) > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > index da11036ad804..0a083407aa3e 100644 > --- a/drivers/media/i2c/Kconfig > +++ b/drivers/media/i2c/Kconfig > @@ -464,6 +464,19 @@ config VIDEO_VPX3220 > To compile this driver as a module, choose M here: the > module will be called vpx3220. > > +config VIDEO_MAX9286 > + tristate "Maxim MAX9286 GMSL deserializer support" > + depends on I2C && I2C_MUX > + depends on OF > + select V4L2_FWNODE > + select VIDEO_V4L2_SUBDEV_API > + select MEDIA_CONTROLLER > + help > + This driver supports the Maxim MAX9286 GMSL deserializer. > + > + To compile this driver as a module, choose M here: the > + module will be called max9286. > + > comment "Video and audio decoders" > > config VIDEO_SAA717X > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > index 993acab81b2c..c8010d77e1a3 100644 > --- a/drivers/media/i2c/Makefile > +++ b/drivers/media/i2c/Makefile > @@ -118,6 +118,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o > obj-$(CONFIG_VIDEO_IMX290) += imx290.o > obj-$(CONFIG_VIDEO_IMX319) += imx319.o > obj-$(CONFIG_VIDEO_IMX355) += imx355.o > +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o > obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o > > obj-$(CONFIG_SDR_MAX2175) += max2175.o > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > new file mode 100644 > index 000000000000..47f280518fdb > --- /dev/null > +++ b/drivers/media/i2c/max9286.c > @@ -0,0 +1,1320 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Maxim MAX9286 GMSL Deserializer Driver > + * > + * Copyright (C) 2017-2019 Jacopo Mondi > + * Copyright (C) 2017-2019 Kieran Bingham > + * Copyright (C) 2017-2019 Laurent Pinchart > + * Copyright (C) 2017-2019 Niklas Söderlund > + * Copyright (C) 2016 Renesas Electronics Corporation > + * Copyright (C) 2015 Cogent Embedded, Inc. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > +#include > +#include > +#include > +#include > + > +/* Register 0x00 */ > +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) > +#define MAX9286_MSTLINKSEL(n) ((n) << 5) > +#define MAX9286_EN_VS_GEN BIT(4) > +#define MAX9286_LINKEN(n) (1 << (n)) > +/* Register 0x01 */ > +#define MAX9286_FSYNCMODE_ECU (3 << 6) > +#define MAX9286_FSYNCMODE_EXT (2 << 6) > +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) > +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) > +#define MAX9286_GPIEN BIT(5) > +#define MAX9286_ENLMO_RSTFSYNC BIT(2) > +#define MAX9286_FSYNCMETH_AUTO (2 << 0) > +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) > +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) > +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 > +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 > +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 > +/* Register 0x0a */ > +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) > +#define MAX9286_REVCCEN(n) (1 << (n)) > +/* Register 0x0c */ > +#define MAX9286_HVEN BIT(7) > +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) > +#define MAX9286_EDC_6BIT_CRC (1 << 5) > +#define MAX9286_EDC_1BIT_PARITY (0 << 5) > +#define MAX9286_DESEL BIT(4) > +#define MAX9286_INVVS BIT(3) > +#define MAX9286_INVHS BIT(2) > +#define MAX9286_HVSRC_D0 (2 << 0) > +#define MAX9286_HVSRC_D14 (1 << 0) > +#define MAX9286_HVSRC_D18 (0 << 0) > +/* Register 0x0f */ > +#define MAX9286_0X0F_RESERVED BIT(3) > +/* Register 0x12 */ > +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) > +#define MAX9286_CSIDBL BIT(5) > +#define MAX9286_DBL BIT(4) > +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) > +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) > +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) > +#define MAX9286_DATATYPE_RAW14 (8 << 0) > +#define MAX9286_DATATYPE_RAW11 (7 << 0) > +#define MAX9286_DATATYPE_RAW10 (6 << 0) > +#define MAX9286_DATATYPE_RAW8 (5 << 0) > +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) > +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) > +#define MAX9286_DATATYPE_RGB555 (2 << 0) > +#define MAX9286_DATATYPE_RGB565 (1 << 0) > +#define MAX9286_DATATYPE_RGB888 (0 << 0) > +/* Register 0x15 */ > +#define MAX9286_VC(n) ((n) << 5) > +#define MAX9286_VCTYPE BIT(4) > +#define MAX9286_CSIOUTEN BIT(3) > +#define MAX9286_0X15_RESV (3 << 0) > +/* Register 0x1b */ > +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) > +#define MAX9286_ENEQ(n) (1 << (n)) > +/* Register 0x27 */ > +#define MAX9286_LOCKED BIT(7) > +/* Register 0x31 */ > +#define MAX9286_FSYNC_LOCKED BIT(6) > +/* Register 0x34 */ > +#define MAX9286_I2CLOCACK BIT(7) > +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) > +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) > +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) > +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) > +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) > +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) > +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) > +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) > +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) > +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) > +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) > +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) > +#define MAX9286_I2CSLVTO_NONE (3 << 0) > +#define MAX9286_I2CSLVTO_1024US (2 << 0) > +#define MAX9286_I2CSLVTO_256US (1 << 0) > +#define MAX9286_I2CSLVTO_64US (0 << 0) > +/* Register 0x3b */ > +#define MAX9286_REV_TRF(n) ((n) << 4) > +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ > +#define MAX9286_REV_AMP_X BIT(0) > +/* Register 0x3f */ > +#define MAX9286_EN_REV_CFG BIT(6) > +#define MAX9286_REV_FLEN(n) ((n) - 20) > +/* Register 0x49 */ > +#define MAX9286_VIDEO_DETECT_MASK 0x0f > +/* Register 0x69 */ > +#define MAX9286_LFLTBMONMASKED BIT(7) > +#define MAX9286_LOCKMONMASKED BIT(6) > +#define MAX9286_AUTOCOMBACKEN BIT(5) > +#define MAX9286_AUTOMASKEN BIT(4) > +#define MAX9286_MASKLINK(n) ((n) << 0) > + > +/* > + * The sink and source pads are created to match the OF graph port numbers so > + * that their indexes can be used interchangeably. > + */ > +#define MAX9286_NUM_GMSL 4 > +#define MAX9286_N_SINKS 4 > +#define MAX9286_N_PADS 5 > +#define MAX9286_SRC_PAD 4 > + > +struct max9286_source { > + struct v4l2_async_subdev asd; > + struct v4l2_subdev *sd; > + struct fwnode_handle *fwnode; > +}; > + > +#define asd_to_max9286_source(_asd) \ > + container_of(_asd, struct max9286_source, asd) > + > +struct max9286_priv { > + struct i2c_client *client; > + struct gpio_desc *gpiod_pwdn; > + struct v4l2_subdev sd; > + struct media_pad pads[MAX9286_N_PADS]; > + struct regulator *regulator; > + > + struct gpio_chip gpio; > + u8 gpio_state; > + > + struct i2c_mux_core *mux; > + unsigned int mux_channel; > + bool mux_open; > + > + struct v4l2_ctrl_handler ctrls; > + struct v4l2_ctrl *pixelrate; > + > + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; > + > + /* Protects controls and fmt structures */ > + struct mutex mutex; > + > + unsigned int nsources; > + unsigned int source_mask; > + unsigned int route_mask; > + unsigned int bound_sources; > + unsigned int csi2_data_lanes; > + struct max9286_source sources[MAX9286_NUM_GMSL]; > + struct v4l2_async_notifier notifier; > +}; > + > +static struct max9286_source *next_source(struct max9286_priv *priv, > + struct max9286_source *source) > +{ > + if (!source) > + source = &priv->sources[0]; > + else > + source++; > + > + for (; source < &priv->sources[MAX9286_NUM_GMSL]; source++) { > + if (source->fwnode) > + return source; > + } > + > + return NULL; > +} > + > +#define for_each_source(priv, source) \ > + for ((source) = NULL; ((source) = next_source((priv), (source))); ) > + > +#define to_index(priv, source) ((source) - &(priv)->sources[0]) > + > +static inline struct max9286_priv *sd_to_max9286(struct v4l2_subdev *sd) > +{ > + return container_of(sd, struct max9286_priv, sd); > +} > + > +/* ----------------------------------------------------------------------------- > + * I2C IO > + */ > + > +static int max9286_read(struct max9286_priv *priv, u8 reg) > +{ > + int ret; > + > + ret = i2c_smbus_read_byte_data(priv->client, reg); > + if (ret < 0) > + dev_err(&priv->client->dev, > + "%s: register 0x%02x read failed (%d)\n", > + __func__, reg, ret); > + > + return ret; > +} > + > +static int max9286_write(struct max9286_priv *priv, u8 reg, u8 val) > +{ > + int ret; > + > + ret = i2c_smbus_write_byte_data(priv->client, reg, val); > + if (ret < 0) > + dev_err(&priv->client->dev, > + "%s: register 0x%02x write failed (%d)\n", > + __func__, reg, ret); > + > + return ret; > +} > + > +/* ----------------------------------------------------------------------------- > + * I2C Multiplexer > + */ > + > +static void max9286_i2c_mux_configure(struct max9286_priv *priv, u8 conf) > +{ > + max9286_write(priv, 0x0a, conf); > + > + /* > + * We must sleep after any change to the forward or reverse channel > + * configuration. > + */ > + usleep_range(3000, 5000); > +} > + > +static void max9286_i2c_mux_open(struct max9286_priv *priv) > +{ > + /* Open all channels on the MAX9286 */ > + max9286_i2c_mux_configure(priv, 0xff); > + > + priv->mux_open = true; > +} > + > +static void max9286_i2c_mux_close(struct max9286_priv *priv) > +{ > + /* > + * Ensure that both the forward and reverse channel are disabled on the > + * mux, and that the channel ID is invalidated to ensure we reconfigure > + * on the next max9286_i2c_mux_select() call. > + */ > + max9286_i2c_mux_configure(priv, 0x00); > + > + priv->mux_open = false; > + priv->mux_channel = -1; > +} > + > +static int max9286_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan) > +{ > + struct max9286_priv *priv = i2c_mux_priv(muxc); > + > + /* Channel select is disabled when configured in the opened state. */ > + if (priv->mux_open) > + return 0; > + > + if (priv->mux_channel == chan) > + return 0; > + > + priv->mux_channel = chan; > + > + max9286_i2c_mux_configure(priv, > + MAX9286_FWDCCEN(chan) | > + MAX9286_REVCCEN(chan)); > + > + return 0; > +} > + > +static int max9286_i2c_mux_init(struct max9286_priv *priv) > +{ > + struct max9286_source *source; > + int ret; > + > + if (!i2c_check_functionality(priv->client->adapter, > + I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) > + return -ENODEV; > + > + priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev, > + priv->nsources, 0, I2C_MUX_LOCKED, > + max9286_i2c_mux_select, NULL); > + if (!priv->mux) > + return -ENOMEM; > + > + priv->mux->priv = priv; > + > + for_each_source(priv, source) { > + unsigned int index = to_index(priv, source); > + > + ret = i2c_mux_add_adapter(priv->mux, 0, index, 0); > + if (ret < 0) > + goto error; > + } > + > + return 0; > + > +error: > + i2c_mux_del_adapters(priv->mux); > + return ret; > +} > + > +static void max9286_configure_i2c(struct max9286_priv *priv, bool localack) > +{ > + u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US | > + MAX9286_I2CMSTBT_105KBPS; > + > + if (localack) > + config |= MAX9286_I2CLOCACK; > + > + max9286_write(priv, 0x34, config); > + usleep_range(3000, 5000); > +} > + > +/* > + * max9286_check_video_links() - Make sure video links are detected and locked > + * > + * Performs safety checks on video link status. Make sure they are detected > + * and all enabled links are locked. > + * > + * Returns 0 for success, -EIO for errors. > + */ > +static int max9286_check_video_links(struct max9286_priv *priv) > +{ > + unsigned int i; > + int ret; > + > + /* > + * Make sure valid video links are detected. > + * The delay is not characterized in de-serializer manual, wait up > + * to 5 ms. > + */ > + for (i = 0; i < 10; i++) { > + ret = max9286_read(priv, 0x49); > + if (ret < 0) > + return -EIO; > + > + if ((ret & MAX9286_VIDEO_DETECT_MASK) == priv->source_mask) > + break; > + > + usleep_range(350, 500); > + } > + > + if (i == 10) { > + dev_err(&priv->client->dev, > + "Unable to detect video links: 0x%02x\n", ret); > + return -EIO; > + } > + > + /* Make sure all enabled links are locked (4ms max). */ > + for (i = 0; i < 10; i++) { > + ret = max9286_read(priv, 0x27); > + if (ret < 0) > + return -EIO; > + > + if (ret & MAX9286_LOCKED) > + break; > + > + usleep_range(350, 450); > + } > + > + if (i == 10) { > + dev_err(&priv->client->dev, "Not all enabled links locked\n"); > + return -EIO; > + } > + > + return 0; > +} > + > +/* > + * max9286_check_config_link() - Detect and wait for configuration links > + * > + * Determine if the configuration channel is up and settled for a link. > + * > + * Returns 0 for success, -EIO for errors. > + */ > +static int max9286_check_config_link(struct max9286_priv *priv, > + unsigned int source_mask) > +{ > + unsigned int conflink_mask = (source_mask & 0x0f) << 4; > + unsigned int i; > + int ret; > + > + /* > + * Make sure requested configuration links are detected. > + * The delay is not characterized in the chip manual: wait up > + * to 5 milliseconds. > + */ > + for (i = 0; i < 10; i++) { > + ret = max9286_read(priv, 0x49) & 0xf0; > + if (ret < 0) > + return -EIO; > + > + if (ret == conflink_mask) > + break; > + > + usleep_range(350, 500); > + } > + > + if (ret != conflink_mask) { > + dev_err(&priv->client->dev, > + "Unable to detect configuration links: 0x%02x expected 0x%02x\n", > + ret, conflink_mask); > + return -EIO; > + } > + > + dev_info(&priv->client->dev, > + "Successfully detected configuration links after %u loops: 0x%02x\n", > + i, conflink_mask); > + > + return 0; > +} > + > +/* ----------------------------------------------------------------------------- > + * V4L2 Subdev > + */ > + > +static int max9286_set_pixelrate(struct max9286_priv *priv) > +{ > + struct max9286_source *source = NULL; > + u64 pixelrate = 0; > + > + for_each_source(priv, source) { > + struct v4l2_ctrl *ctrl; > + u64 source_rate = 0; > + > + /* Pixel rate is mandatory to be reported by sources. */ > + ctrl = v4l2_ctrl_find(source->sd->ctrl_handler, > + V4L2_CID_PIXEL_RATE); > + if (!ctrl) { > + pixelrate = 0; > + break; > + } > + > + /* All source must report the same pixel rate. */ > + source_rate = v4l2_ctrl_g_ctrl_int64(ctrl); > + if (!pixelrate) { > + pixelrate = source_rate; > + } else if (pixelrate != source_rate) { > + dev_err(&priv->client->dev, > + "Unable to calculate pixel rate\n"); > + return -EINVAL; > + } > + } > + > + if (!pixelrate) { > + dev_err(&priv->client->dev, > + "No pixel rate control available in sources\n"); > + return -EINVAL; > + } > + > + /* > + * The CSI-2 transmitter pixel rate is the single source rate multiplied > + * by the number of available sources. > + */ > + return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, > + pixelrate * priv->nsources); > +} > + > +static int max9286_notify_bound(struct v4l2_async_notifier *notifier, > + struct v4l2_subdev *subdev, > + struct v4l2_async_subdev *asd) > +{ > + struct max9286_priv *priv = sd_to_max9286(notifier->sd); > + struct max9286_source *source = asd_to_max9286_source(asd); > + unsigned int index = to_index(priv, source); > + unsigned int src_pad; > + int ret; > + > + ret = media_entity_get_fwnode_pad(&subdev->entity, > + source->fwnode, > + MEDIA_PAD_FL_SOURCE); > + if (ret < 0) { > + dev_err(&priv->client->dev, > + "Failed to find pad for %s\n", subdev->name); > + return ret; > + } > + > + priv->bound_sources |= BIT(index); > + source->sd = subdev; > + src_pad = ret; > + > + ret = media_create_pad_link(&source->sd->entity, src_pad, > + &priv->sd.entity, index, > + MEDIA_LNK_FL_ENABLED | > + MEDIA_LNK_FL_IMMUTABLE); > + if (ret) { > + dev_err(&priv->client->dev, > + "Unable to link %s:%u -> %s:%u\n", > + source->sd->name, src_pad, priv->sd.name, index); > + return ret; > + } > + > + dev_dbg(&priv->client->dev, "Bound %s pad: %u on index %u\n", > + subdev->name, src_pad, index); > + > + /* > + * We can only register v4l2_async_notifiers, which do not provide a > + * means to register a complete callback. bound_sources allows us to > + * identify when all remote serializers have completed their probe. > + */ > + if (priv->bound_sources != priv->source_mask) > + return 0; > + > + /* > + * All enabled sources have probed and enabled their reverse control > + * channels: > + * > + * - Verify all configuration links are properly detected > + * - Disable auto-ack as communication on the control channel are now > + * stable. > + */ > + max9286_check_config_link(priv, priv->source_mask); > + > + /* > + * Re-configure I2C with local acknowledge disabled after cameras have > + * probed. > + */ > + max9286_configure_i2c(priv, false); > + > + return max9286_set_pixelrate(priv); > +} > + > +static void max9286_notify_unbind(struct v4l2_async_notifier *notifier, > + struct v4l2_subdev *subdev, > + struct v4l2_async_subdev *asd) > +{ > + struct max9286_priv *priv = sd_to_max9286(notifier->sd); > + struct max9286_source *source = asd_to_max9286_source(asd); > + unsigned int index = to_index(priv, source); > + > + source->sd = NULL; > + priv->bound_sources &= ~BIT(index); > +} > + > +static const struct v4l2_async_notifier_operations max9286_notify_ops = { > + .bound = max9286_notify_bound, > + .unbind = max9286_notify_unbind, > +}; > + > +static int max9286_v4l2_notifier_register(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct max9286_source *source = NULL; > + int ret; > + > + if (!priv->nsources) > + return 0; > + > + v4l2_async_notifier_init(&priv->notifier); > + > + for_each_source(priv, source) { > + unsigned int i = to_index(priv, source); > + > + source->asd.match_type = V4L2_ASYNC_MATCH_FWNODE; > + source->asd.match.fwnode = source->fwnode; > + > + ret = v4l2_async_notifier_add_subdev(&priv->notifier, > + &source->asd); > + if (ret) { > + dev_err(dev, "Failed to add subdev for source %d", i); > + v4l2_async_notifier_cleanup(&priv->notifier); > + return ret; > + } > + > + /* > + * Balance the reference counting handled through > + * v4l2_async_notifier_cleanup() > + */ > + fwnode_handle_get(source->fwnode); > + } > + > + priv->notifier.ops = &max9286_notify_ops; > + > + ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier); > + if (ret) { > + dev_err(dev, "Failed to register subdev_notifier"); > + v4l2_async_notifier_cleanup(&priv->notifier); > + return ret; > + } > + > + return 0; > +} > + > +static void max9286_v4l2_notifier_unregister(struct max9286_priv *priv) > +{ > + if (!priv->nsources) > + return; > + > + v4l2_async_notifier_unregister(&priv->notifier); > + v4l2_async_notifier_cleanup(&priv->notifier); > +} > + > +static int max9286_s_stream(struct v4l2_subdev *sd, int enable) > +{ > + struct max9286_priv *priv = sd_to_max9286(sd); > + struct max9286_source *source; > + unsigned int i; > + bool sync = false; > + int ret; > + > + if (enable) { > + /* > + * The frame sync between cameras is transmitted across the > + * reverse channel as GPIO. We must open all channels while > + * streaming to allow this synchronisation signal to be shared. > + */ > + max9286_i2c_mux_open(priv); > + > + /* Start all cameras. */ > + for_each_source(priv, source) { > + ret = v4l2_subdev_call(source->sd, video, s_stream, 1); > + if (ret) > + return ret; > + } > + > + ret = max9286_check_video_links(priv); > + if (ret) > + return ret; > + > + /* > + * Wait until frame synchronization is locked. > + * > + * Manual says frame sync locking should take ~6 VTS. > + * From practical experience at least 8 are required. Give > + * 12 complete frames time (~400ms at 30 fps) to achieve frame > + * locking before returning error. > + */ > + for (i = 0; i < 40; i++) { > + if (max9286_read(priv, 0x31) & MAX9286_FSYNC_LOCKED) { > + sync = true; > + break; > + } > + usleep_range(9000, 11000); > + } > + > + if (!sync) { > + dev_err(&priv->client->dev, > + "Failed to get frame synchronization\n"); > + return -EXDEV; /* Invalid cross-device link */ > + } > + > + /* > + * Enable CSI output, VC set according to link number. > + * Bit 7 must be set (chip manual says it's 0 and reserved). > + */ > + max9286_write(priv, 0x15, 0x80 | MAX9286_VCTYPE | > + MAX9286_CSIOUTEN | MAX9286_0X15_RESV); > + } else { > + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); > + > + /* Stop all cameras. */ > + for_each_source(priv, source) > + v4l2_subdev_call(source->sd, video, s_stream, 0); > + > + max9286_i2c_mux_close(priv); > + } > + > + return 0; > +} > + > +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_mbus_code_enum *code) > +{ > + if (code->pad || code->index > 0) > + return -EINVAL; > + > + code->code = MEDIA_BUS_FMT_UYVY8_1X16; > + > + return 0; > +} > + > +static struct v4l2_mbus_framefmt * > +max9286_get_pad_format(struct max9286_priv *priv, > + struct v4l2_subdev_pad_config *cfg, > + unsigned int pad, u32 which) > +{ > + switch (which) { > + case V4L2_SUBDEV_FORMAT_TRY: > + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); > + case V4L2_SUBDEV_FORMAT_ACTIVE: > + return &priv->fmt[pad]; > + default: > + return NULL; > + } > +} > + > +static int max9286_set_fmt(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_format *format) > +{ > + struct max9286_priv *priv = sd_to_max9286(sd); > + struct v4l2_mbus_framefmt *cfg_fmt; > + > + if (format->pad == MAX9286_SRC_PAD) > + return -EINVAL; > + > + /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */ > + switch (format->format.code) { > + case MEDIA_BUS_FMT_UYVY8_1X16: > + case MEDIA_BUS_FMT_VYUY8_1X16: > + case MEDIA_BUS_FMT_YUYV8_1X16: > + case MEDIA_BUS_FMT_YVYU8_1X16: > + break; > + default: > + format->format.code = MEDIA_BUS_FMT_UYVY8_1X16; > + break; > + } > + > + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); > + if (!cfg_fmt) > + return -EINVAL; > + > + mutex_lock(&priv->mutex); > + *cfg_fmt = format->format; > + mutex_unlock(&priv->mutex); > + > + return 0; > +} > + > +static int max9286_get_fmt(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_format *format) > +{ > + struct max9286_priv *priv = sd_to_max9286(sd); > + struct v4l2_mbus_framefmt *cfg_fmt; > + unsigned int pad = format->pad; > + > + /* > + * Multiplexed Stream Support: Support link validation by returning the > + * format of the first bound link. All links must have the same format, > + * as we do not support mixing and matching of cameras connected to the > + * max9286. > + */ > + if (pad == MAX9286_SRC_PAD) > + pad = __ffs(priv->bound_sources); > + > + cfg_fmt = max9286_get_pad_format(priv, cfg, pad, format->which); > + if (!cfg_fmt) > + return -EINVAL; > + > + mutex_lock(&priv->mutex); > + format->format = *cfg_fmt; > + mutex_unlock(&priv->mutex); > + > + return 0; > +} > + > +static const struct v4l2_subdev_video_ops max9286_video_ops = { > + .s_stream = max9286_s_stream, > +}; > + > +static const struct v4l2_subdev_pad_ops max9286_pad_ops = { > + .enum_mbus_code = max9286_enum_mbus_code, > + .get_fmt = max9286_get_fmt, > + .set_fmt = max9286_set_fmt, > +}; > + > +static const struct v4l2_subdev_ops max9286_subdev_ops = { > + .video = &max9286_video_ops, > + .pad = &max9286_pad_ops, > +}; > + > +static void max9286_init_format(struct v4l2_mbus_framefmt *fmt) > +{ > + fmt->width = 1280; > + fmt->height = 800; > + fmt->code = MEDIA_BUS_FMT_UYVY8_1X16; > + fmt->colorspace = V4L2_COLORSPACE_SRGB; > + fmt->field = V4L2_FIELD_NONE; > + fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; > + fmt->quantization = V4L2_QUANTIZATION_DEFAULT; > + fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT; > +} > + > +static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh) > +{ > + struct v4l2_mbus_framefmt *format; > + unsigned int i; > + > + for (i = 0; i < MAX9286_N_SINKS; i++) { > + format = v4l2_subdev_get_try_format(subdev, fh->pad, i); > + max9286_init_format(format); > + } > + > + return 0; > +} > + > +static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = { > + .open = max9286_open, > +}; > + > +static int max9286_s_ctrl(struct v4l2_ctrl *ctrl) > +{ > + switch (ctrl->id) { > + case V4L2_CID_PIXEL_RATE: > + return 0; > + default: > + return -EINVAL; > + } > +} > + > +static const struct v4l2_ctrl_ops max9286_ctrl_ops = { > + .s_ctrl = max9286_s_ctrl, > +}; > + > +static int max9286_v4l2_register(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct fwnode_handle *ep; > + int ret; > + int i; > + > + /* Register v4l2 async notifiers for connected Camera subdevices */ > + ret = max9286_v4l2_notifier_register(priv); > + if (ret) { > + dev_err(dev, "Unable to register V4L2 async notifiers\n"); > + return ret; > + } > + > + /* Configure V4L2 for the MAX9286 itself */ > + > + for (i = 0; i < MAX9286_N_SINKS; i++) > + max9286_init_format(&priv->fmt[i]); > + > + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops); > + priv->sd.internal_ops = &max9286_subdev_internal_ops; > + priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; > + > + v4l2_ctrl_handler_init(&priv->ctrls, 1); > + priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls, > + &max9286_ctrl_ops, > + V4L2_CID_PIXEL_RATE, > + 1, INT_MAX, 1, 50000000); > + > + priv->sd.ctrl_handler = &priv->ctrls; > + ret = priv->ctrls.error; > + if (ret) > + goto err_async; > + > + priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; > + > + priv->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE; > + for (i = 0; i < MAX9286_SRC_PAD; i++) > + priv->pads[i].flags = MEDIA_PAD_FL_SINK; > + ret = media_entity_pads_init(&priv->sd.entity, MAX9286_N_PADS, > + priv->pads); > + if (ret) > + goto err_async; > + > + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), MAX9286_SRC_PAD, > + 0, 0); > + if (!ep) { > + dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n"); > + ret = -ENOENT; > + goto err_async; > + } > + priv->sd.fwnode = ep; > + > + ret = v4l2_async_register_subdev(&priv->sd); > + if (ret < 0) { > + dev_err(dev, "Unable to register subdevice\n"); > + goto err_put_node; > + } > + > + return 0; > + > +err_put_node: > + fwnode_handle_put(ep); > +err_async: > + max9286_v4l2_notifier_unregister(priv); > + > + return ret; > +} > + > +static void max9286_v4l2_unregister(struct max9286_priv *priv) > +{ > + fwnode_handle_put(priv->sd.fwnode); > + v4l2_async_unregister_subdev(&priv->sd); > + max9286_v4l2_notifier_unregister(priv); > +} > + > +/* ----------------------------------------------------------------------------- > + * Probe/Remove > + */ > + > +static int max9286_setup(struct max9286_priv *priv) > +{ > + /* > + * Link ordering values for all enabled links combinations. Orders must > + * be assigned sequentially from 0 to the number of enabled links > + * without leaving any hole for disabled links. We thus assign orders to > + * enabled links first, and use the remaining order values for disabled > + * links are all links must have a different order value; > + */ > + static const u8 link_order[] = { > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */ > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */ > + (3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */ > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */ > + (3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */ > + (3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */ > + (3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */ > + (3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */ > + (0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */ > + (1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */ > + (1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */ > + (2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */ > + (1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */ > + (2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */ > + (2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */ > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */ > + }; > + > + /* > + * Set the I2C bus speed. > + * > + * Enable I2C Local Acknowledge during the probe sequences of the camera > + * only. This should be disabled after the mux is initialised. > + */ > + max9286_configure_i2c(priv, true); > + > + /* > + * Reverse channel setup. > + * > + * - Enable custom reverse channel configuration (through register 0x3f) > + * and set the first pulse length to 35 clock cycles. > + * - Increase the reverse channel amplitude to 170mV to accommodate the > + * high threshold enabled by the serializer driver. > + */ > + max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35)); > + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) | > + MAX9286_REV_AMP_X); > + usleep_range(2000, 2500); > + > + /* > + * Enable GMSL links, mask unused ones and autodetect link > + * used as CSI clock source. > + */ > + max9286_write(priv, 0x00, MAX9286_MSTLINKSEL_AUTO | priv->route_mask); > + max9286_write(priv, 0x0b, link_order[priv->route_mask]); > + max9286_write(priv, 0x69, (0xf & ~priv->route_mask)); > + > + /* > + * Video format setup: > + * Disable CSI output, VC is set according to Link number. > + */ > + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); > + > + /* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */ > + max9286_write(priv, 0x12, MAX9286_CSIDBL | MAX9286_DBL | > + MAX9286_CSILANECNT(priv->csi2_data_lanes) | > + MAX9286_DATATYPE_YUV422_8BIT); > + > + /* Automatic: FRAMESYNC taken from the slowest Link. */ > + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ | > + MAX9286_FSYNCMETH_AUTO); > + > + /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */ > + max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS | > + MAX9286_HVSRC_D14); > + > + /* > + * The overlap window seems to provide additional validation by tracking > + * the delay between vsync and frame sync, generating an error if the > + * delay is bigger than the programmed window, though it's not yet clear > + * what value should be set. > + * > + * As it's an optional value and can be disabled, we do so by setting > + * a 0 overlap value. > + */ > + max9286_write(priv, 0x63, 0); > + max9286_write(priv, 0x64, 0); > + > + /* > + * Wait for 2ms to allow the link to resynchronize after the > + * configuration change. > + */ > + usleep_range(2000, 5000); > + > + return 0; > +} > + > +static void max9286_gpio_set(struct gpio_chip *chip, > + unsigned int offset, int value) > +{ > + struct max9286_priv *priv = gpiochip_get_data(chip); > + > + if (value) > + priv->gpio_state |= BIT(offset); > + else > + priv->gpio_state &= ~BIT(offset); > + > + max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state); > +} > + > +static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset) > +{ > + struct max9286_priv *priv = gpiochip_get_data(chip); > + > + return priv->gpio_state & BIT(offset); > +} > + > +static int max9286_register_gpio(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct gpio_chip *gpio = &priv->gpio; > + int ret; > + > + /* Configure the GPIO */ > + gpio->label = dev_name(dev); > + gpio->parent = dev; > + gpio->owner = THIS_MODULE; > + gpio->of_node = dev->of_node; > + gpio->ngpio = 2; > + gpio->base = -1; > + gpio->set = max9286_gpio_set; > + gpio->get = max9286_gpio_get; > + gpio->can_sleep = true; > + > + /* GPIO values default to high */ > + priv->gpio_state = BIT(0) | BIT(1); > + > + ret = devm_gpiochip_add_data(dev, gpio, priv); > + if (ret) > + dev_err(dev, "Unable to create gpio_chip\n"); > + > + return ret; > +} > + > +static int max9286_init(struct device *dev) > +{ > + struct max9286_priv *priv; > + struct i2c_client *client; > + int ret; > + > + client = to_i2c_client(dev); > + priv = i2c_get_clientdata(client); > + > + /* Enable the bus power. */ > + ret = regulator_enable(priv->regulator); > + if (ret < 0) { > + dev_err(&client->dev, "Unable to turn PoC on\n"); > + return ret; > + } > + > + ret = max9286_setup(priv); > + if (ret) { > + dev_err(dev, "Unable to setup max9286\n"); > + goto err_regulator; > + } > + > + /* > + * Register all V4L2 interactions for the MAX9286 and notifiers for > + * any subdevices connected. > + */ > + ret = max9286_v4l2_register(priv); > + if (ret) { > + dev_err(dev, "Failed to register with V4L2\n"); > + goto err_regulator; > + } > + > + ret = max9286_i2c_mux_init(priv); > + if (ret) { > + dev_err(dev, "Unable to initialize I2C multiplexer\n"); > + goto err_v4l2_register; > + } > + > + /* Leave the mux channels disabled until they are selected. */ > + max9286_i2c_mux_close(priv); > + > + return 0; > + > +err_v4l2_register: > + max9286_v4l2_unregister(priv); > +err_regulator: > + regulator_disable(priv->regulator); > + > + return ret; > +} > + > +static void max9286_cleanup_dt(struct max9286_priv *priv) > +{ > + struct max9286_source *source; > + > + for_each_source(priv, source) { > + fwnode_handle_put(source->fwnode); > + source->fwnode = NULL; > + } > +} > + > +static int max9286_parse_dt(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct device_node *i2c_mux; > + struct device_node *node = NULL; > + unsigned int i2c_mux_mask = 0; > + > + /* Balance the of_node_put() performed by of_find_node_by_name(). */ > + of_node_get(dev->of_node); > + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > + if (!i2c_mux) { > + dev_err(dev, "Failed to find i2c-mux node\n"); > + return -EINVAL; > + } > + > + /* Identify which i2c-mux channels are enabled */ > + for_each_child_of_node(i2c_mux, node) { > + u32 id = 0; > + > + of_property_read_u32(node, "reg", &id); > + if (id >= MAX9286_NUM_GMSL) > + continue; > + > + if (!of_device_is_available(node)) { > + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); > + continue; > + } > + > + i2c_mux_mask |= BIT(id); > + } > + of_node_put(node); > + of_node_put(i2c_mux); > + > + /* Parse the endpoints */ > + for_each_endpoint_of_node(dev->of_node, node) { > + struct max9286_source *source; > + struct of_endpoint ep; > + > + of_graph_parse_endpoint(node, &ep); > + dev_dbg(dev, "Endpoint %pOF on port %d", > + ep.local_node, ep.port); > + > + if (ep.port > MAX9286_NUM_GMSL) { > + dev_err(dev, "Invalid endpoint %s on port %d", > + of_node_full_name(ep.local_node), ep.port); > + continue; > + } > + > + /* For the source endpoint just parse the bus configuration. */ > + if (ep.port == MAX9286_SRC_PAD) { > + struct v4l2_fwnode_endpoint vep = { > + .bus_type = V4L2_MBUS_CSI2_DPHY > + }; > + int ret; > + > + ret = v4l2_fwnode_endpoint_parse( > + of_fwnode_handle(node), &vep); > + if (ret) { > + of_node_put(node); > + return ret; > + } > + > + priv->csi2_data_lanes = > + vep.bus.mipi_csi2.num_data_lanes; > + > + continue; > + } > + > + /* Skip if the corresponding GMSL link is unavailable. */ > + if (!(i2c_mux_mask & BIT(ep.port))) > + continue; > + > + if (priv->sources[ep.port].fwnode) { > + dev_err(dev, > + "Multiple port endpoints are not supported: %d", > + ep.port); > + > + continue; > + } > + > + source = &priv->sources[ep.port]; > + source->fwnode = fwnode_graph_get_remote_endpoint( > + of_fwnode_handle(node)); > + if (!source->fwnode) { > + dev_err(dev, > + "Endpoint %pOF has no remote endpoint connection\n", > + ep.local_node); > + > + continue; > + } > + > + priv->source_mask |= BIT(ep.port); > + priv->nsources++; > + } > + of_node_put(node); > + > + priv->route_mask = priv->source_mask; > + > + return 0; > +} > + > +static int max9286_probe(struct i2c_client *client) > +{ > + struct max9286_priv *priv; > + int ret; > + > + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + mutex_init(&priv->mutex); > + > + priv->client = client; > + i2c_set_clientdata(client, priv); > + > + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", > + GPIOD_OUT_HIGH); > + if (IS_ERR(priv->gpiod_pwdn)) > + return PTR_ERR(priv->gpiod_pwdn); > + > + gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn"); > + gpiod_set_value_cansleep(priv->gpiod_pwdn, 1); > + > + /* Wait at least 4ms before the I2C lines latch to the address */ > + if (priv->gpiod_pwdn) > + usleep_range(4000, 5000); > + > + /* > + * The MAX9286 starts by default with all ports enabled, we disable all > + * ports early to ensure that all channels are disabled if we error out > + * and keep the bus consistent. > + */ > + max9286_i2c_mux_close(priv); > + > + /* > + * The MAX9286 initialises with auto-acknowledge enabled by default. > + * This can be invasive to other transactions on the same bus, so > + * disable it early. It will be enabled only as and when needed. > + */ > + max9286_configure_i2c(priv, false); > + > + ret = max9286_register_gpio(priv); > + if (ret) > + goto err_powerdown; > + > + priv->regulator = devm_regulator_get(&client->dev, "poc"); > + if (IS_ERR(priv->regulator)) { > + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) > + dev_err(&client->dev, > + "Unable to get PoC regulator (%ld)\n", > + PTR_ERR(priv->regulator)); > + ret = PTR_ERR(priv->regulator); > + goto err_powerdown; > + } > + > + ret = max9286_parse_dt(priv); > + if (ret) > + goto err_powerdown; > + > + ret = max9286_init(&client->dev); > + if (ret < 0) > + goto err_cleanup_dt; > + > + return 0; > + > +err_cleanup_dt: > + max9286_cleanup_dt(priv); > +err_powerdown: > + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > + > + return ret; > +} > + > +static int max9286_remove(struct i2c_client *client) > +{ > + struct max9286_priv *priv = i2c_get_clientdata(client); > + > + i2c_mux_del_adapters(priv->mux); > + > + max9286_v4l2_unregister(priv); > + > + regulator_disable(priv->regulator); > + > + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > + > + max9286_cleanup_dt(priv); > + > + return 0; > +} > + > +static const struct of_device_id max9286_dt_ids[] = { > + { .compatible = "maxim,max9286" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, max9286_dt_ids); > + > +static struct i2c_driver max9286_i2c_driver = { > + .driver = { > + .name = "max9286", > + .of_match_table = of_match_ptr(max9286_dt_ids), > + }, > + .probe_new = max9286_probe, > + .remove = max9286_remove, > +}; > + > +module_i2c_driver(max9286_i2c_driver); > + > +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); > +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); > +MODULE_LICENSE("GPL"); > -- Regards -- Kieran