Re: [PATCH v2 1/6] ASoC: davinci-mcbsp: add binding for McBSP

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On Friday 15 April 2016 02:18 PM, Petr Kulhavy wrote:

> On 13.04.2016 16:30, Rob Herring wrote:

>> On Mon, Apr 11, 2016 at 01:45:12PM +0200, Petr Kulhavy wrote:

>>> a/Documentation/devicetree/bindings/sound/davinci-mcbsp.txt
>>> b/Documentation/devicetree/bindings/sound/davinci-mcbsp.txt
>>> new file mode 100644
>>> index 000000000000..de45865c3863
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/sound/davinci-mcbsp.txt
>>> @@ -0,0 +1,51 @@
>>> +Texas Instruments DaVinci McBSP module
>>> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> +
>>> +This binding describes the "Multi-channel Buffered Serial Port" (McBSP)
>>> +audio interface found in some TI DaVinci processors like the
>>> OMAP-L138 or AM180x.
>>> +
>>> +
>>> +Required properties:
>>> +~~~~~~~~~~~~~~~~~~~~
>>> +- compatible : "ti,da850-mcbsp"
>> You list several SoCs above, but only one compatible string here. A
>> specific compatible string per SoC please.
>>
> Hi Rob,
> 
> thank you for your feedback. I can test only on the AM1808 platform,
> however as far as I understand the OMAP L138 and AM1808 use the same
> McBSP hardware. The TI guys can give more insight here... Isn't it then
> redundant to define more compatible strings? Sorry for my ignorance, I
> just don't know the policy of defining the compatible strings.

DA850, OMAP-L138 and AM18x are pin-for-pin compatible devices meant for
different markets/applications. IP-wise, silicon-integration-wise or
pin-wise, there is no difference in way McASP behaves between the parts.

Thanks,
Sekhar
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