Re: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors

[Randy Dunlap]

On 7/18/23 05:13, Fabrizio Castro wrote:
> Hi Randy,
> 
>> From: Randy Dunlap <rd.dunlab@xxxxxxxxx>
>> Subject: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors
>>
>> From: Randy Dunlap <rd.dunlab@xxxxxxxxx>
>>
>> When (MFD) RZ_MTU3=m and PWM_RZ_MTU3=y, there are numerous build
>> errors:
>>
>>
>> Modify the dependencies of PWM_RZ_MTU3 so that COMPILE_TEST is
>> still allowed but PWM_RZ_MTU3 depends on RZ_MTU3 if it is being built
>> but also allow the latter not to be built.
>>
>>  drivers/pwm/Kconfig |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff -- a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
>> --- a/drivers/pwm/Kconfig
>> +++ b/drivers/pwm/Kconfig
>> @@ -505,7 +505,8 @@ config PWM_ROCKCHIP
>>
>>  config PWM_RZ_MTU3
>>  	tristate "Renesas RZ/G2L MTU3a PWM Timer support"
>> -	depends on RZ_MTU3 || COMPILE_TEST
>> +	depends on COMPILE_TEST
>> +	depends on RZ_MTU3 || RZ_MTU3=n
> 
> Isn't this a tautology?

Not at all. It's used in Kconfig quite a bit.
This is tristate logic.

It says that if RZ_MTU3 is y/m, PWM_RZ_MTU3 is limited by that.
But if RZ_MTU3 is n, PWM_RZ_MTU3 can be y or m.

Is that clearer?

-- 
~Randy