linux-kernel - Re: [PATCH v2 1/8] drm: xlnx: Fix kerneldoc

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Date: Thu, 21 Mar 2024 11:33:52 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Randy Dunlap <rdunlap@...radead.org>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Michal Simek <michal.simek@....com>, David Airlie <airlied@...il.com>,
 linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
 linux-arm-kernel@...ts.infradead.org,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 1/8] drm: xlnx: Fix kerneldoc

On 3/20/24 02:05, Randy Dunlap wrote:
> 
> 
> On 3/19/24 22:42, Tomi Valkeinen wrote:
>> On 20/03/2024 00:51, Sean Anderson wrote:
>>> Fix a few errors in the kerneldoc. Mostly this addresses missing/renamed
>>> members.
>>>
>>> Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
>>> ---
>>>
>>> Changes in v2:
>>> - New
>>>
>>>   drivers/gpu/drm/xlnx/zynqmp_disp.c  | 6 +++---
>>>   drivers/gpu/drm/xlnx/zynqmp_dpsub.h | 1 +
>>>   drivers/gpu/drm/xlnx/zynqmp_kms.h   | 4 ++--
>>>   3 files changed, 6 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
>>> index 407bc07cec69..f79bf3fb8110 100644
>>> --- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
>>> +++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
>>> @@ -128,9 +128,9 @@ struct zynqmp_disp_layer {
>>>    * struct zynqmp_disp - Display controller
>>>    * @dev: Device structure
>>>    * @dpsub: Display subsystem
>>> - * @blend.base: Register I/O base address for the blender
>>> - * @avbuf.base: Register I/O base address for the audio/video buffer manager
>>> - * @audio.base: Registers I/O base address for the audio mixer
>>> + * @blend: Register I/O base address for the blender
>>> + * @avbuf: Register I/O base address for the audio/video buffer manager
>>> + * @audio: Registers I/O base address for the audio mixer
>> 
>> Afaics, the kernel doc guide:
>> 
>> https://docs.kernel.org/doc-guide/kernel-doc.html#nested-structs-unions
>> 
>> says that the current version is correct. Or is the issue that while, say, 'base' is documented, 'blend' was not?
> 
> Hi,
> 
> I would do it more like so:
> 
> ---
>  drivers/gpu/drm/xlnx/zynqmp_disp.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff -- a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> --- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> @@ -128,8 +128,11 @@ struct zynqmp_disp_layer {
>   * struct zynqmp_disp - Display controller
>   * @dev: Device structure
>   * @dpsub: Display subsystem
> + * @blend: blender iomem info
>   * @blend.base: Register I/O base address for the blender
> + * @avbuf: audio/video buffer iomem info
>   * @avbuf.base: Register I/O base address for the audio/video buffer manager
> + * @audio: audio mixer iomem info
>   * @audio.base: Registers I/O base address for the audio mixer
>   * @layers: Layers (planes)
>   */
> 
> 
> but in my testing, Sean's way or my way result in no warning/errors.
> 

The specific errors are:

./drivers/gpu/drm/xlnx/zynqmp_disp.c:151: warning: Function parameter or struct member 'blend' not described in 'zynqmp_disp'
./drivers/gpu/drm/xlnx/zynqmp_disp.c:151: warning: Function parameter or struct member 'avbuf' not described in 'zynqmp_disp'
./drivers/gpu/drm/xlnx/zynqmp_disp.c:151: warning: Function parameter or struct member 'audio' not described in 'zynqmp_disp'

I don't see the need to document a single-member struct twice. Actually,
maybe it would be better to just lift the .base member to live in
zynqmp_disp. But I think that would be better in another series.

--Sean