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

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Date:   Tue, 18 Jul 2023 07:39:39 -0700
From:   Randy Dunlap <rd.dunlab@...il.com>
To:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors

On 7/18/23 05:13, Fabrizio Castro wrote:
> Hi Randy,
> 
>> From: Randy Dunlap <rd.dunlab@...il.com>
>> Subject: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors
>>
>> From: Randy Dunlap <rd.dunlab@...il.com>
>>
>> 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