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Message-ID: <14adece8-d73f-212b-2bfa-70eb3602666c@mentor.com>
Date: Tue, 28 Mar 2017 17:12:46 +0300
From: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
To: Steve Longerbeam <slongerbeam@...il.com>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <shawnguo@...nel.org>,
<kernel@...gutronix.de>, <fabio.estevam@....com>,
<linux@...linux.org.uk>, <mchehab@...nel.org>,
<hverkuil@...all.nl>, <nick@...anahar.org>,
<markus.heiser@...marIT.de>, <p.zabel@...gutronix.de>,
<laurent.pinchart+renesas@...asonboard.com>, <bparrot@...com>,
<geert@...ux-m68k.org>, <arnd@...db.de>,
<sudipm.mukherjee@...il.com>, <minghsiu.tsai@...iatek.com>,
<tiffany.lin@...iatek.com>, <jean-christophe.trotin@...com>,
<horms+renesas@...ge.net.au>,
<niklas.soderlund+renesas@...natech.se>, <robert.jarzmik@...e.fr>,
<songjun.wu@...rochip.com>, <andrew-ct.chen@...iatek.com>,
<gregkh@...uxfoundation.org>, <shuah@...nel.org>,
<sakari.ailus@...ux.intel.com>, <pavel@....cz>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-media@...r.kernel.org>, <devel@...verdev.osuosl.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v6 17/39] platform: add video-multiplexer subdevice driver
Hi Steve,
On 03/28/2017 03:40 AM, Steve Longerbeam wrote:
> From: Philipp Zabel <p.zabel@...gutronix.de>
>
> This driver can handle SoC internal and external video bus multiplexers,
> controlled either by register bit fields or by a GPIO. The subdevice
> passes through frame interval and mbus configuration of the active input
> to the output side.
>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
>
> - fixed a cut&paste error in vidsw_remove(): v4l2_async_register_subdev()
> should be unregister.
>
> - added media_entity_cleanup() to vidsw_remove().
>
> - added missing MODULE_DEVICE_TABLE().
> Suggested-by: Javier Martinez Canillas <javier@...hile0.org>
>
> - there was a line left over from a previous iteration that negated
> the new way of determining the pad count just before it which
> has been removed (num_pads = of_get_child_count(np)).
>
> - removed [gs]_frame_interval ops. timeperframe is not used anywhwere
> in this subdev, and currently it has no control over frame rate.
>
> - add link_validate to media_entity_operations.
>
> - moved devicetree binding doc to a separate commit.
>
> - Philipp Zabel has developed a set of patches that allow adding
> to the subdev async notifier waiting list using a chaining method
> from the async registered callbacks (v4l2_of_subdev_registered()
> and the prep patches for that). For now, I've removed the use of
> v4l2_of_subdev_registered() for the vidmux driver's registered
> callback. This doesn't affect the functionality of this driver,
> but allows for it to be merged now, before adding the chaining
> support.
>
> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
> ---
> drivers/media/platform/Kconfig | 8 +
> drivers/media/platform/Makefile | 2 +
> drivers/media/platform/video-multiplexer.c | 451 +++++++++++++++++++++++++++++
> 3 files changed, 461 insertions(+)
> create mode 100644 drivers/media/platform/video-multiplexer.c
>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index ab0bb48..c9b8d9c 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -74,6 +74,14 @@ config VIDEO_M32R_AR_M64278
> To compile this driver as a module, choose M here: the
> module will be called arv.
>
> +config VIDEO_MULTIPLEXER
> + tristate "Video Multiplexer"
> + depends on VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
+ depends on OF
> + help
> + This driver provides support for SoC internal N:1 video bus
> + multiplexers controlled by register bitfields as well as external
> + 2:1 video multiplexers controlled by a single GPIO.
> +
[snip]
> +static int vidsw_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct of_endpoint endpoint;
> + struct device_node *ep;
> + struct reg_field field;
> + struct vidsw *vidsw;
> + struct regmap *map;
> + unsigned int num_pads;
> + int ret;
> +
> + vidsw = devm_kzalloc(&pdev->dev, sizeof(*vidsw), GFP_KERNEL);
> + if (!vidsw)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, vidsw);
> +
> + v4l2_subdev_init(&vidsw->subdev, &vidsw_subdev_ops);
> + snprintf(vidsw->subdev.name, sizeof(vidsw->subdev.name), "%s",
> + np->name);
.... or oops here ^^^^^^^^^.
> + vidsw->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + vidsw->subdev.dev = &pdev->dev;
> +
> + /*
> + * The largest numbered port is the output port. It determines
> + * total number of pads
> + */
> + num_pads = 0;
> + for_each_endpoint_of_node(np, ep) {
> + of_graph_parse_endpoint(ep, &endpoint);
> + num_pads = max(num_pads, endpoint.port + 1);
> + }
> +
> + if (num_pads < 2) {
> + dev_err(&pdev->dev, "Not enough ports %d\n", num_pads);
> + return -EINVAL;
> + }
This unveils another runtime dependency on OF.
> +
> + ret = of_get_reg_field(np, &field);
> + if (ret == 0) {
> + map = syscon_node_to_regmap(np->parent);
> + if (!map) {
> + dev_err(&pdev->dev, "Failed to get syscon register map\n");
> + return PTR_ERR(map);
> + }
> +
> + vidsw->field = devm_regmap_field_alloc(&pdev->dev, map, field);
> + if (IS_ERR(vidsw->field)) {
> + dev_err(&pdev->dev, "Failed to allocate regmap field\n");
> + return PTR_ERR(vidsw->field);
> + }
> +
> + regmap_field_read(vidsw->field, &vidsw->active);
> + } else {
> + if (num_pads > 3) {
> + dev_err(&pdev->dev, "Too many ports %d\n", num_pads);
> + return -EINVAL;
> + }
> +
> + vidsw->gpio = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
> + if (IS_ERR(vidsw->gpio)) {
> + dev_warn(&pdev->dev,
> + "could not request control gpio: %d\n", ret);
> + vidsw->gpio = NULL;
> + }
> +
> + vidsw->active = gpiod_get_value(vidsw->gpio) ? 1 : 0;
vidsw->active is always set to 0 ?
> + }
> +
> + vidsw->num_pads = num_pads;
> + vidsw->pads = devm_kzalloc(&pdev->dev, sizeof(*vidsw->pads) * num_pads,
> + GFP_KERNEL);
> + vidsw->format_mbus = devm_kzalloc(&pdev->dev,
> + sizeof(*vidsw->format_mbus) * num_pads, GFP_KERNEL);
> + vidsw->endpoint = devm_kzalloc(&pdev->dev,
> + sizeof(*vidsw->endpoint) * (num_pads - 1), GFP_KERNEL);
> +
> + ret = vidsw_async_init(vidsw, np);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
--
With best wishes,
Vladimir
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