Re: [PATCH v4] i2c: designware: Do not require clock when SSCN and FFCN are provided

[Loc Ho]

Hi,

>> The current driver uses input clock source frequency to calculate
>> values for [SS|FS]_[HC|LC] registers. However, when booting ACPI, we do not
>> currently have a good way to provide the frequency information.
>> Instead, we can leverage the SSCN and FFCN ACPI methods, which can be used
>> to directly provide these values. So, the clock information should
>> no longer be required during probing.
>>
>> However, since clk can be invalid, additional checks must be done where
>> we are making use of it.
>>
>> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>> Tested-by: Loc Ho <lho@xxxxxxx>
>> ---
>>
>> Note: This has been tested on AMD Seattle RevB for both DT and ACPI.
>>
>> Changes from V3 (https://lkml.org/lkml/2015/12/22/596):
>>     * Add i2c_dw_plat_prepare_clk() per Andy's suggestion
>>     * Add tested-by Loc Ho.
>
> The changes from V3 are big enough that I'd appreciate a new Tested-by
> tag.
>

Will let you know when I have moment to give this a try on X-Gene.

-Loc
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