From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C78C5C433DF for ; Thu, 14 May 2020 09:53:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9057820671 for ; Thu, 14 May 2020 09:53:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="ovhMXHXx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726147AbgENJxT (ORCPT ); Thu, 14 May 2020 05:53:19 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:60852 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725952AbgENJxS (ORCPT ); Thu, 14 May 2020 05:53:18 -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 A0B549A8; Thu, 14 May 2020 11:53:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1589449991; bh=6EbBixnRLQelVAWei7vqHY9L37Shj9yKogTJ2E6dK3M=; h=Reply-To:Subject:To:Cc:References:From:Date:In-Reply-To:From; b=ovhMXHXx4ZOSeSYHoeZo+K3Sy9hZ48zy95suH/nHJiHoiNJPfURLsHnUSFRD+Qxvz LdES2AxaGfFqcYGk3JHlSbQkNhUSAWf6NiylKuPNNc6X2Fs4ekQn8naH7pQ2E3CFRc 5ZySvtZmI2MFK35CK8nXvVjocKYyTGgN2grZHA3k= Reply-To: kieran.bingham+renesas@ideasonboard.com Subject: Re: [PATCH v9 2/4] media: i2c: Add MAX9286 driver To: Manivannan Sadhasivam Cc: linux-renesas-soc@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , Kieran Bingham , Laurent Pinchart , Jacopo Mondi , =?UTF-8?Q?Niklas_S=c3=b6derlund?= , sakari.ailus@iki.fi, Hans Verkuil , Hyun Kwon , Rob Herring , Jacopo Mondi , Laurent Pinchart , =?UTF-8?Q?Niklas_S=c3=b6derlund?= References: <20200512155105.1068064-1-kieran.bingham+renesas@ideasonboard.com> <20200512155105.1068064-3-kieran.bingham+renesas@ideasonboard.com> <20200512174056.GH5526@Mani-XPS-13-9360> From: Kieran Bingham Organization: Ideas on Board Message-ID: Date: Thu, 14 May 2020 10:53:00 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200512174056.GH5526@Mani-XPS-13-9360> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Mani, On 12/05/2020 18:40, Manivannan Sadhasivam wrote: > Hi Kieran, > > On Tue, May 12, 2020 at 04:51:03PM +0100, 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 >> --- >> MAINTAINERS | 10 + >> drivers/media/i2c/Kconfig | 13 + >> drivers/media/i2c/Makefile | 1 + >> drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ >> 4 files changed, 1356 insertions(+) >> create mode 100644 drivers/media/i2c/max9286.c >> >> diff --git a/MAINTAINERS b/MAINTAINERS >> index a7bb6e22d5da..99e3bf7760fd 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 3abc80373ec0..2e390f41f6da 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 77bf7d0b691f..f0b001ee4b05 100644 >> --- a/drivers/media/i2c/Makefile >> +++ b/drivers/media/i2c/Makefile >> @@ -117,6 +117,7 @@ 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..481d65f2b51d >> --- /dev/null >> +++ b/drivers/media/i2c/max9286.c >> @@ -0,0 +1,1332 @@ >> +// 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_2X8; >> + >> + 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_2X8: >> + case MEDIA_BUS_FMT_VYUY8_2X8: >> + case MEDIA_BUS_FMT_YUYV8_2X8: >> + case MEDIA_BUS_FMT_YVYU8_2X8: >> + break; >> + default: >> + format->format.code = MEDIA_BUS_FMT_YUYV8_2X8; > > Is there any reason for not setting default format to MEDIA_BUS_FMT_UYVY8_2X8? > No good reason no, and I see that in max9286_enum_mbus_code(), we currently code to MEDIA_BUS_FMT_YUYV8_2X8, and that's the value that we init to, so that would be a better default indeed. I'll update this for v10. > Thanks, > Mani > >> + 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; >> + >> + if (format->pad >= MAX9286_SRC_PAD) >> + return -EINVAL; >> + >> + cfg_fmt = max9286_get_pad_format(priv, cfg, format->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_2X8; >> + 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; >> + >> + static const char * const names[] = { >> + "GPIO0OUT", >> + "GPIO1OUT", >> + }; >> + >> + /* 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->names = names; >> + >> + /* 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; >> + >> + 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"); >> + of_node_put(dev->of_node); >> + 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); >> + of_node_put(dev->of_node); >> + return ret; >> + } >> + >> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { >> + dev_err(dev, >> + "Media bus %u type not supported\n", >> + vep.bus_type); >> + v4l2_fwnode_endpoint_free(&vep); >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + return -EINVAL; >> + } >> + >> + priv->csi2_data_lanes = >> + vep.bus.mipi_csi2.num_data_lanes; >> + v4l2_fwnode_endpoint_free(&vep); >> + >> + 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); >> + of_node_put(dev->of_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"); >> -- >> 2.25.1 >>