linux-kernel - Re: [PATCH v8 02/14] media: doc: add document for rkisp1 meta buffer format

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Message-ID: <20190815135143.GU5011@pendragon.ideasonboard.com>
Date:   Thu, 15 Aug 2019 16:51:43 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Helen Koike <helen.koike@...labora.com>
Cc:     linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        eddie.cai.linux@...il.com, mchehab@...nel.org, heiko@...ech.de,
        jacob2.chen@...k-chips.com, jeffy.chen@...k-chips.com,
        zyc@...k-chips.com, linux-kernel@...r.kernel.org,
        tfiga@...omium.org, hans.verkuil@...co.com,
        sakari.ailus@...ux.intel.com, kernel@...labora.com,
        ezequiel@...labora.com, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, zhengsq@...k-chips.com,
        Jacob Chen <jacob-chen@...k-chips.com>
Subject: Re: [PATCH v8 02/14] media: doc: add document for rkisp1 meta buffer
 format

Hi Helen,

Thank you for the patch.

On Tue, Jul 30, 2019 at 03:42:44PM -0300, Helen Koike wrote:
> From: Jacob Chen <jacob2.chen@...k-chips.com>
> 
> This commit add document for rkisp1 meta buffer format
> 
> Signed-off-by: Jacob Chen <jacob-chen@...k-chips.com>
> Acked-by: Hans Verkuil <hans.verkuil@...co.com>
> [update for upstream]
> Signed-off-by: Helen Koike <helen.koike@...labora.com>
> 
> ---
> 
> Changes in v8:
> - Add SPDX in the header
> - Remove emacs configs
> - Fix doc style
> 
> Changes in v7:
> - s/correspond/corresponding
> - s/use/uses
> - s/docuemnt/document
> 
>  Documentation/media/uapi/v4l/meta-formats.rst |  2 ++
>  .../uapi/v4l/pixfmt-meta-rkisp1-params.rst    | 23 +++++++++++++++++++
>  .../uapi/v4l/pixfmt-meta-rkisp1-stat.rst      | 22 ++++++++++++++++++
>  3 files changed, 47 insertions(+)
>  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-params.rst
>  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-stat.rst
> 
> diff --git a/Documentation/media/uapi/v4l/meta-formats.rst b/Documentation/media/uapi/v4l/meta-formats.rst
> index b10ca9ee3968..5de621fea3cc 100644
> --- a/Documentation/media/uapi/v4l/meta-formats.rst
> +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> @@ -24,3 +24,5 @@ These formats are used for the :ref:`metadata` interface only.
>      pixfmt-meta-uvc
>      pixfmt-meta-vsp1-hgo
>      pixfmt-meta-vsp1-hgt
> +    pixfmt-meta-rkisp1-params
> +    pixfmt-meta-rkisp1-stat
> diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-params.rst b/Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-params.rst
> new file mode 100644
> index 000000000000..103b5cb79b7c
> --- /dev/null
> +++ b/Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-params.rst
> @@ -0,0 +1,23 @@
> +.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +
> +.. _v4l2-meta-fmt-rkisp1-params:
> +
> +============================
> +V4L2_META_FMT_RK_ISP1_PARAMS
> +============================
> +
> +Rockchip ISP1 Parameters Data
> +
> +Description
> +===========
> +
> +This format describes input parameters for the Rockchip ISP1.
> +
> +It uses c-struct :c:type:`rkisp1_isp_params_cfg`, which is defined in
> +the ``linux/rkisp1-config.h`` header file.

I would say that

"The buffer contains a single instance of the C structure
:c:type:`rkisp1_isp_params_cfg`, defined in the
``linux/rkisp1-config.h`` header file."

And add a sentence to explain what the alignment requirements are.

> +
> +The parameters consist of multiple modules.
> +The module won't be updated if the corresponding bit was not set in module_*_update.

Doesn't this belong to rkisp1-config.h ? I would group all the
information related to fields of the structure in the header file, and
only have here the information related to the buffer layout (this mainly
referencing the structure and talking about alignment/padding).

> +
> +.. kernel-doc:: include/uapi/linux/rkisp1-config.h
> +   :functions: rkisp1_isp_params_cfg
> diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-stat.rst b/Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-stat.rst
> new file mode 100644
> index 000000000000..4ad303f96421
> --- /dev/null
> +++ b/Documentation/media/uapi/v4l/pixfmt-meta-rkisp1-stat.rst
> @@ -0,0 +1,22 @@
> +.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +
> +.. _v4l2-meta-fmt-rkisp1-stat:
> +
> +=============================
> +V4L2_META_FMT_RK_ISP1_STAT_3A
> +=============================
> +
> +
> +Rockchip ISP1 Statistics Data
> +
> +Description
> +===========
> +
> +This format describes image color statistics information generated by the Rockchip
> +ISP1.
> +
> +It uses c-struct :c:type:`rkisp1_stat_buffer`, which is defined in
> +the ``linux/rkisp1-config.h`` header file.

Same comment here, I think we need to document alignment/padding
constraints.

> +
> +.. kernel-doc:: include/uapi/linux/rkisp1-config.h
> +   :functions: rkisp1_stat_buffer

-- 
Regards,

Laurent Pinchart