linux-kernel - Re: [PATCH v6 2/9] watchdog: rzg2l_wdt: Make the driver depend on PM

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Date: Thu, 8 Feb 2024 15:02:24 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: wim@...ux-watchdog.org, linux@...ck-us.net, robh@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 p.zabel@...gutronix.de, geert+renesas@...der.be, magnus.damm@...il.com,
 biju.das.jz@...renesas.com, linux-watchdog@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v6 2/9] watchdog: rzg2l_wdt: Make the driver depend on PM

Hi, Geert,

On 08.02.2024 14:53, Geert Uytterhoeven wrote:
> Hi Claudiu,
> 
> On Thu, Feb 8, 2024 at 1:26 PM Claudiu <claudiu.beznea@...on.dev> wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> The rzg2l_wdt watchdog driver cannot work w/o CONFIG_PM=y (e.g. the
>> clocks are enabled though pm_runtime_* specific APIs). To avoid building
>> a driver that doesn't work make explicit the dependency on CONFIG_PM.
>>
>> Suggested-by: Guenter Roeck <linux@...ck-us.net>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>> ---
>>
>> Changes in v6:
>> - update patch description
>> - fixed the dependency on COMPILE_TEST previously introduced
> 
> Thanks for the update!
> 
>> --- a/drivers/watchdog/Kconfig
>> +++ b/drivers/watchdog/Kconfig
>> @@ -911,6 +911,7 @@ config RENESAS_RZN1WDT
>>  config RENESAS_RZG2LWDT
>>         tristate "Renesas RZ/G2L WDT Watchdog"
>>         depends on ARCH_RZG2L || ARCH_R9A09G011 || COMPILE_TEST
>> +       depends on PM
> 
> depends on PM || COMPILE_TEST

Isn't "depends on PM" enough? As of [1] ("If multiple dependencies are
defined, they are connected with '&&'") the above:

depends on ARCH_RZG2L || ARCH_R9A09G011 || COMPILE_TEST
depends on PM

are translated into:
depends on (ARCH_RZG2L || ARCH_R9A09G011 || COMPILE_TEST) && PM

Please let me know if I'm wrong.

Thank you,
Claudiu Beznea

[1] https://www.kernel.org/doc/html/next/kbuild/kconfig-language.html

> 
>>         select WATCHDOG_CORE
>>         help
>>           This driver adds watchdog support for the integrated watchdogs in the
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
>