linux-kernel - Re: [PATCH v4 2/9] watchdog: rzg2l_wdt: Make the driver depend on PM

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Date: Tue, 6 Feb 2024 09:34:04 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Claudiu <claudiu.beznea@...on.dev>
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 v4 2/9] watchdog: rzg2l_wdt: Make the driver depend on PM

Hi Claudiu,

Thanks for your patch!

On Tue, Feb 6, 2024 at 8:52 AM 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 don't work select CONFIG_PM.

depend on?

> Suggested-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -910,7 +910,7 @@ config RENESAS_RZN1WDT
>
>  config RENESAS_RZG2LWDT
>         tristate "Renesas RZ/G2L WDT Watchdog"
> -       depends on ARCH_RZG2L || ARCH_R9A09G011 || COMPILE_TEST
> +       depends on ((ARCH_RZG2L || ARCH_R9A09G011) && PM) || COMPILE_TEST

IMHO this is still a bit futile, as both ARCH_RZG2L and ARCH_R9A09G011
select PM, so this is always met.  In addition, the "&& PM" clutters
the logic, and makes the expression harder to read.

If Günter insists on having the dependency, what about adding a
separate line instead?

    depends on PM || COMPILE_TEST

>         select WATCHDOG_CORE
>         help
>           This driver adds watchdog support for the integrated watchdogs in the

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds