Re: [PATCH v9 2/4] media: i2c: Add MAX9286 driver

From: Manivannan Sadhasivam
Date: Tue May 12 2020 - 14:17:22 EST

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In reply to: Kieran Bingham: "Re: [PATCH v9 2/4] media: i2c: Add MAX9286 driver"
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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 <jacopo+renesas@xxxxxxxxxx>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
>
> --
> 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 <jacopo+renesas@xxxxxxxxxx>
> +M: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> +M: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> +M: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> +L: linux-media@xxxxxxxxxxxxxxx
> +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 <peda@xxxxxxxxxx>
> L: alsa-devel@xxxxxxxxxxxxxxxx (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 <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/fwnode.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/i2c.h>
> +#include <linux/i2c-mux.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +/* 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 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);

So if you have more than one MAX9286 in a system, all gpiochips will appear
with the same name. I'd recommend to append the index to distinguish properly.

> + 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_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);

Why this is needed?

> + 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_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);

Usual power down sequence is to pull the power down gpio low and then turn off
the regulators. This helps in clearing up the internal state machine properly.

Thanks,
Mani

> +
> + 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
>

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