Re: [PATCH] mailbox, remoteproc: k3-m4+: fix compile testing

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On Mon, Oct 14, 2024, at 14:56, Andrew Davis wrote:
> On 10/7/24 8:23 AM, Arnd Bergmann wrote:
>>   config TI_K3_M4_REMOTEPROC
>>   	tristate "TI K3 M4 remoteproc support"
>> -	depends on ARCH_OMAP2PLUS || ARCH_K3
>> -	select MAILBOX
>> -	select OMAP2PLUS_MBOX
>> +	depends on ARCH_K3 || COMPILE_TEST
>> +	depends on TI_SCI_PROTOCOL || (COMPILE_TEST && TI_SCI_PROTOCOL=n)
>
> This line is odd. IMHO "COMPILE_TEST" should only be added to ARCH_*
> dependencies, as often only one ARCH can be selected which prevents
> compile testing drivers with various multiple architecture deps in
> one compile test.

I generally agree, but the TI_SCI_PROTOCOL interface
definitions that were added in aa276781a64a ("firmware: Add basic
support for TI System Control Interface (TI-SCI) protocol")
appear to explicitly support the case of compile-testing.

See also 13678f3feb30 ("reset: ti-sci: honor TI_SCI_PROTOCOL
setting when not COMPILE_TEST").

> Normal dependencies, on the other hand, can simply be enabled if one
> wants to compile test its dependent drivers. In this case, TI_SCI_PROTOCOL
> cannot be enabled as it has a dependency up the chain that doesn't
> allow selecting when not on a TI platform. We can fix that as I posted
> here[0]. With that fix in, this line can be simply become:
>
> depends on TI_SCI_PROTOCOL

That's certainly fine with me, but if we do this, I would suggest
also removing the stub functions from
include/linux/soc/ti/ti_sci_protocol.h, and the dependency in the
reset driver.

Adding Nishanth Menon to Cc, to see if he has a preference.

     Arnd




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