[PATCH V6 0/5] Use CCF to describe the UART baud rate clock

[Yu Tu]

  Hi Kevin,
	First of all,thank you very much for your reply.Due to the Chinese 
Spring Festival holiday recently, so i just reply to you now。

On 2022/1/25 3:58, Kevin Hilman wrote:
> [ EXTERNAL EMAIL ]
> 
> Yu Tu <yu.tu at amlogic.com> writes:
> 
>> Hi Kevin,
>> 	Thank you very much for your reply.
>>
>> On 2022/1/20 6:37, Kevin Hilman wrote:
>>> [ EXTERNAL EMAIL ]
>>>
>>> Hello,
>>>
>>> Yu Tu <yu.tu at amlogic.com> writes:
>>>
>>>> Using the common Clock code to describe the UART baud rate
>>>> clock makes it easier for the UART driver to be compatible
>>>> with the baud rate requirements of the UART IP on different
>>>> meson chips. Add Meson S4 SoC compatible.
>>>
>>> Could you describe how this was tested and on which SoCs?  There seem to
>>> be some changes in this series that might affect previous SoCs.
>>>
>> For me, the board starts normally and prints. My intention was to add
>> the S4 SOC UART compatible, but for the S4 our baud rate clock is
>> calculated at 12MHz by default.So a series of changes were made at your
>> suggestion.
>>
>> Since most SoCs are too old, I was able to find all the platforms myself
>> such as Meson6, Meson8, Meson8b, GXL and so on. I only tested it with
>> G12A and S4.But when I talked to Martin earlier he tried meson8b's log.
>> The test patch is in the attachment.
>>
>> I have found that on some boards with this change, the initcall_debug
>> Uart driver takes longer to initialize. Running the stty command to
>> change the baud rate at the same time may cause a jam.
> 
> This kind of detail is important to document in the cover letter,
> including a bit more detail on how to reproduce so that other can help
> test or may have ideas for how to solve.
> 
The problem recurrence method is described below:
First, add the patch I changed. It then launches normally to the console 
command line.  Finally, run the stty command to change buad rate. The 
detailed commands are as follows:
stty -F /dev/ttyAML0 115200 and stty -F /dev/ttyAML0 921600 .Alternate 
execution can reproduce.

>> I'd love to know what else you suggest.
> 
> I don't expect you to be able to test on all SoCs, but just to list what
> SoCs and which boards you tested on.  This way, those who have other
> boards can help test and we can have a better idea of how this was
> tested before merging.
> 
I only have S4 and G12A so far, so I've only tested on those two platforms.

> Thanks,
> 
> Kevin
>