lkml.org 
[lkml]   [2023]   [Aug]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 1/2] gpio: dt-bindings: add parsing of loongson gpio offset
From
Date


在 2023/8/2 下午3:22, Conor Dooley 写道:
> On Wed, Aug 02, 2023 at 09:38:34AM +0800, Yinbo Zhu wrote:
>>
>>
>> 在 2023/8/1 下午11:54, Conor Dooley 写道:
>>> On Tue, Aug 01, 2023 at 04:34:30PM +0800, Yinbo Zhu wrote:
>>>>
>>>>
>>>> 在 2023/8/1 下午3:23, Conor Dooley 写道:
>>>>> On Tue, Aug 01, 2023 at 02:39:49PM +0800, Yinbo Zhu wrote:
>>>>>>
>>>>>>
>>>>>> 在 2023/7/31 下午11:55, Conor Dooley 写道:
>>>>>>> On Mon, Jul 31, 2023 at 05:10:58PM +0800, Yinbo Zhu wrote:
>>>>>>>> Add parsing GPIO configure, input, output, interrupt register offset
>>>>>>>> address and GPIO control mode support.
>>>>>>>
>>>>>>> This reeks of insufficient use of SoC specific compatibles. Do GPIO
>>>>>>> controllers on the same SoC have different register offsets?
>>>>>>
>>>>>>
>>>>>> Yes,
>>>>>>
>>>>>>> Where are the users for this?
>>>>>>
>>>>>>
>>>>>> For example, ls2k500 contains multiple GPIO chips with different
>>>>>> (configure, input, output, interrupt) offset addresses, but all others
>>>>>> are the same.
>>>>>
>>>>> Right. That's admittedly not what I expected to hear! Can you firstly
>>>>> explain this in the commit message,
>>>>
>>>>
>>>> I will add following explain in the commit message. Do you think it's
>>>> suitable?
>>>>
>>>> Loongson GPIO controllers come in multiple variants that are compatible
>>>> except for certain register offset values. Add support in yaml file for
>>>> device properties allowing to specify them in DT.
>>>
>>> Sure, that would be helpful.
>>>
>>>>> and secondly add a soc-specific
>>>>> compatible for the ls2k500 and only allow these properties on that SoC?
>>>
>>>> Sorry, I may not have described it clearly before, the ls2k500 was only
>>>> as a example, actually, Loongson GPIO controllers (2k500,2k1000,eg)come
>>>> in multiple variants that are compatible except for certain register
>>>> offset values. So above all offset device property was used to in all
>>>> loongson gpio controller.
>>>
>>> But it would be good to know why they are different. Do they each
>>> support some different features, or was there some other reason for
>>> making controllers like this?
>>
>>
>> There are no other reasons, just differences in these offset addresses.
>
> Huh. Do you have a link to a devicetree for the ls2k500?


Yes, there was a link about ls2k500 dts, but that ls2k500 dts has not
yet added a gpio node. this gpio node will be added later.

Thanks,
Yinbo

\
 
 \ /
  Last update: 2023-08-02 09:48    [W:0.081 / U:0.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site