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Date: Wed, 6 Feb 2019 19:59:43 -0300
From: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To: Maxime Ripard <maxime.ripard@...tlin.com>
Cc: Hans Verkuil <hans.verkuil@...co.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
linux-media <linux-media@...r.kernel.org>,
Andrzej Hajda <a.hajda@...sung.com>,
Chen-Yu Tsai <wens@...e.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
devicetree@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH v2 3/5] media: sunxi: Add A10 CSI driver
On Mon, 28 Jan 2019 at 11:53, Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> The older CSI drivers have camera capture interface different from the one
> in the newer ones.
>
> This IP is pretty simple. Some variants (one controller out of two
> instances on some SoCs) have an ISP embedded, but there's no code that make
> use of it, so we ignored that part for now.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
> ---
> MAINTAINERS | 8 +-
> drivers/media/platform/sunxi/Kconfig | 1 +-
> drivers/media/platform/sunxi/Makefile | 1 +-
> drivers/media/platform/sunxi/sun4i-csi/Kconfig | 12 +-
> drivers/media/platform/sunxi/sun4i-csi/Makefile | 5 +-
> drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c | 261 ++++++++-
> drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h | 142 ++++-
> drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c | 435 +++++++++++++-
> drivers/media/platform/sunxi/sun4i-csi/sun4i_v4l2.c | 305 +++++++++-
> 9 files changed, 1170 insertions(+)
> create mode 100644 drivers/media/platform/sunxi/sun4i-csi/Kconfig
> create mode 100644 drivers/media/platform/sunxi/sun4i-csi/Makefile
> create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
> create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h
> create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c
> create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_v4l2.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 32d444476a90..5f703ed9adb1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1295,6 +1295,14 @@ F: drivers/pinctrl/sunxi/
> F: drivers/soc/sunxi/
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git
>
> +Allwinner A10 CSI driver
> +M: Maxime Ripard <maxime.ripard@...tlin.com>
> +L: linux-media@...r.kernel.org
> +T: git git://linuxtv.org/media_tree.git
> +S: Maintained
> +F: drivers/media/platform/sunxi/sun4i-csi/
> +F: Documentation/devicetree/bindings/media/sun4i-csi.txt
> +
> ARM/Amlogic Meson SoC CLOCK FRAMEWORK
> M: Neil Armstrong <narmstrong@...libre.com>
> M: Jerome Brunet <jbrunet@...libre.com>
> diff --git a/drivers/media/platform/sunxi/Kconfig b/drivers/media/platform/sunxi/Kconfig
> index 1b6e89cb78b2..71808e93ac2e 100644
> --- a/drivers/media/platform/sunxi/Kconfig
> +++ b/drivers/media/platform/sunxi/Kconfig
> @@ -1 +1,2 @@
> +source "drivers/media/platform/sunxi/sun4i-csi/Kconfig"
> source "drivers/media/platform/sunxi/sun6i-csi/Kconfig"
> diff --git a/drivers/media/platform/sunxi/Makefile b/drivers/media/platform/sunxi/Makefile
> index 8d06f98500ee..a05127529006 100644
> --- a/drivers/media/platform/sunxi/Makefile
> +++ b/drivers/media/platform/sunxi/Makefile
> @@ -1 +1,2 @@
> +obj-y += sun4i-csi/
> obj-y += sun6i-csi/
> diff --git a/drivers/media/platform/sunxi/sun4i-csi/Kconfig b/drivers/media/platform/sunxi/sun4i-csi/Kconfig
> new file mode 100644
> index 000000000000..841a6f4d9c99
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun4i-csi/Kconfig
> @@ -0,0 +1,12 @@
> +config VIDEO_SUN4I_CSI
> + tristate "Allwinner A10 CMOS Sensor Interface Support"
> + depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
> + depends on ARCH_SUNXI || COMPILE_TEST
> + select VIDEOBUF2_DMA_CONTIG
> + select V4L2_FWNODE
> + select V4L2_MEM2MEM_DEV
> + help
> + This is a V4L2 driver for the Allwinner A10 CSI
> +
> + To compile this driver as a module, choose M here: the module
> + will be called sun4i_csi.
> diff --git a/drivers/media/platform/sunxi/sun4i-csi/Makefile b/drivers/media/platform/sunxi/sun4i-csi/Makefile
> new file mode 100644
> index 000000000000..7c790a57f5ee
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun4i-csi/Makefile
> @@ -0,0 +1,5 @@
> +sun4i-csi-y += sun4i_csi.o
> +sun4i-csi-y += sun4i_dma.o
> +sun4i-csi-y += sun4i_v4l2.o
> +
> +obj-$(CONFIG_VIDEO_SUN4I_CSI) += sun4i-csi.o
> diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
> new file mode 100644
> index 000000000000..9b58b42c0043
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
> @@ -0,0 +1,261 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2016 NextThing Co
> + * Copyright (C) 2016-2018 Bootlin
> + *
> + * Author: Maxime Ripard <maxime.ripard@...tlin.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/reset.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-mediabus.h>
> +
> +#include <media/videobuf2-core.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "sun4i_csi.h"
> +
> +static int csi_notify_bound(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd)
> +{
> + struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
> + notifier);
> +
> + csi->src_subdev = subdev;
> + csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity,
> + subdev->fwnode,
> + MEDIA_PAD_FL_SOURCE);
> + if (csi->src_pad < 0) {
> + dev_err(csi->dev, "Couldn't find output pad for subdev %s\n",
> + subdev->name);
> + return csi->src_pad;
> + }
> +
> + dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad);
> + return 0;
> +}
> +
> +static int csi_notify_complete(struct v4l2_async_notifier *notifier)
> +{
> + struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
> + notifier);
> + int ret;
> +
> + ret = v4l2_device_register_subdev_nodes(&csi->v4l);
> + if (ret < 0)
> + return ret;
> +
> + ret = sun4i_csi_v4l2_register(csi);
> + if (ret < 0)
> + return ret;
> +
> + return media_create_pad_link(&csi->src_subdev->entity, csi->src_pad,
> + &csi->vdev.entity, 0,
> + MEDIA_LNK_FL_ENABLED |
> + MEDIA_LNK_FL_IMMUTABLE);
> +}
> +
> +static const struct v4l2_async_notifier_operations csi_notify_ops = {
> + .bound = csi_notify_bound,
> + .complete = csi_notify_complete,
> +};
> +
> +static int sun4i_csi_async_parse(struct device *dev,
> + struct v4l2_fwnode_endpoint *vep,
> + struct v4l2_async_subdev *asd)
> +{
> + struct sun4i_csi *csi = dev_get_drvdata(dev);
> +
> + if (vep->base.port || vep->base.id)
> + return -EINVAL;
> +
> + if (vep->bus_type != V4L2_MBUS_PARALLEL)
> + return -EINVAL;
> +
> + csi->bus = vep->bus.parallel;
> +
> + return 0;
> +}
> +
> +static int csi_probe(struct platform_device *pdev)
> +{
> + struct sun4i_csi *csi;
> + struct resource *res;
> + int ret;
> + int irq;
> +
> + csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
> + if (!csi)
> + return -ENOMEM;
> + platform_set_drvdata(pdev, csi);
> + csi->dev = &pdev->dev;
> +
> + csi->mdev.dev = csi->dev;
> + strscpy(csi->mdev.model, "Allwinner Video Capture Device",
> + sizeof(csi->mdev.model));
> + csi->mdev.hw_revision = 0;
> + media_device_init(&csi->mdev);
> + v4l2_async_notifier_init(&csi->notifier);
> +
> + csi->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
> + ret = media_entity_pads_init(&csi->vdev.entity, 1, &csi->pad);
> + if (ret < 0)
> + return 0;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + csi->regs = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(csi->regs))
> + return PTR_ERR(csi->regs);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + csi->bus_clk = devm_clk_get(&pdev->dev, "bus");
> + if (IS_ERR(csi->bus_clk)) {
> + dev_err(&pdev->dev, "Couldn't get our bus clock\n");
> + return PTR_ERR(csi->bus_clk);
> + }
> +
> + csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
> + if (IS_ERR(csi->isp_clk)) {
> + dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
> + return PTR_ERR(csi->isp_clk);
> + }
> +
> + csi->mod_clk = devm_clk_get(&pdev->dev, "mod");
> + if (IS_ERR(csi->mod_clk)) {
> + dev_err(&pdev->dev, "Couldn't get our mod clock\n");
> + return PTR_ERR(csi->mod_clk);
> + }
> +
> + csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
> + if (IS_ERR(csi->ram_clk)) {
> + dev_err(&pdev->dev, "Couldn't get our ram clock\n");
> + return PTR_ERR(csi->ram_clk);
> + }
> +
Minor comment: perhaps you can take advantage
of the clock bulk API and simplify the clock management.
Regards,
Ezequiel
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