linux-kernel - Re: [PATCH 04/10] iio: stx104: Change STX104 dependency to ISA

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Date:	Thu, 7 Apr 2016 17:45:03 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	William Breathitt Gray <vilhelm.gray@...il.com>
Cc:	gregkh@...uxfoundation.org, tglx@...utronix.de, jic23@...nel.org,
	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net, wim@...ana.be,
	linus.walleij@...aro.org, gnurou@...il.com,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-watchdog@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 04/10] iio: stx104: Change STX104 dependency to ISA_BUS

On Thu, Apr 07, 2016 at 10:47:25AM -0400, William Breathitt Gray wrote:
> The Apex Embedded Systems STX104 may be used on 64-bit X86 systems. This
> patch allows the Apex Embedded Systems STX104 DAC driver to be compiled
> for both 32-bit and 64-bit X86 systems.
> 
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
> ---
>  drivers/iio/dac/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
> index a995139..df4b55d 100644
> --- a/drivers/iio/dac/Kconfig
> +++ b/drivers/iio/dac/Kconfig
> @@ -210,7 +210,7 @@ config MCP4922
>  
>  config STX104
>  	tristate "Apex Embedded Systems STX104 DAC driver"
> -	depends on ISA
> +	depends on X86 && ISA_BUS

This means for this and other similar drivers that the driver is no longer
supported on architectures which support ISA but not the newly introduced
ISA_BUS. Affected architectures are alpha, arm, m32r, m68k, mips, powerpc,
and parisc.

A typical example is SCSI_AHA1542, which is no longer supported on those
architectures. It builds, but isa_register_driver() will be a dummy and fail.
Actually, this is true for _all_ drivers calling isa_register_driver().

I hope this is understood and doesn't cause any problems.

Thanks,
Guenter

>  	help
>  	  Say yes here to build support for the 2-channel DAC on the Apex
>  	  Embedded Systems STX104 integrated analog PC/104 card. The base port
> -- 
> 2.7.3
>