linux-kernel - Re: [PATCH v3 28/38] rtc: add HAS

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Date:   Tue, 14 Mar 2023 13:52:02 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        linux-rtc@...r.kernel.org
Subject: Re: [PATCH v3 28/38] rtc: add HAS_IOPORT dependencies

Hello,

On 14/03/2023 13:12:06+0100, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> not being declared. We thus need to add HAS_IOPORT as dependency for
> those drivers using them.
> 
> Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> ---
>  drivers/rtc/Kconfig | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 5a71579af0a1..20aa77bf0a9f 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -956,6 +956,7 @@ comment "Platform RTC drivers"
>  config RTC_DRV_CMOS
>  	tristate "PC-style 'CMOS'"
>  	depends on X86 || ARM || PPC || MIPS || SPARC64
> +	depends on HAS_IOPORT

Did you check that this will not break platforms that doesn't have RTC_PORT defined?

>  	default y if X86
>  	select RTC_MC146818_LIB
>  	help
> @@ -976,6 +977,7 @@ config RTC_DRV_CMOS
>  config RTC_DRV_ALPHA
>  	bool "Alpha PC-style CMOS"
>  	depends on ALPHA
> +	depends on HAS_IOPORT
>  	select RTC_MC146818_LIB
>  	default y
>  	help
> @@ -1193,7 +1195,7 @@ config RTC_DRV_MSM6242
>  
>  config RTC_DRV_BQ4802
>  	tristate "TI BQ4802"
> -	depends on HAS_IOMEM
> +	depends on HAS_IOMEM && HAS_IOPORT
>  	help
>  	  If you say Y here you will get support for the TI
>  	  BQ4802 RTC chip.
> -- 
> 2.37.2
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com