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

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Message-ID: <19d6da67-f9a6-4e01-a956-3b60f0ebf769@ideasonboard.com>
Date: Fri, 22 Mar 2024 07:50:56 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Sean Anderson <sean.anderson@...ux.dev>,
 Randy Dunlap <rdunlap@...radead.org>
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 21/03/2024 17:33, Sean Anderson wrote:
> 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,

But if only the struct is documented, then we're documenting the wrong 
thing. A tool showing to the user what blend.base is would miss that 
documentation.

> 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.

Yes, there's not much point with the structs.

  Tomi