linux-kernel - Re: [PATCH] iio: adc: Kconfig: make AD9467 depend on ADI_AXI

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Date:   Wed, 24 Mar 2021 11:45:14 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Alexandru Ardelean <aardelean@...iqon.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jic23@...nel.org, linux@...iqon.com
Subject: Re: [PATCH] iio: adc: Kconfig: make AD9467 depend on ADI_AXI_ADC
 symbol

On 3/24/21 11:27 AM, Alexandru Ardelean wrote:
> Because a dependency on HAS_IOMEM and OF was added for the ADI AXI ADC
> driver, this makes the AD9467 driver have some build/dependency issues
> when OF is disabled (typically on ACPI archs like x86).
> 
> This is because the selection of the AD9467 enforces the ADI_AXI_ADC symbol
> which is blocked by the OF (and potentially HAS_IOMEM) being disabled.
> 
> To fix this, we make the AD9467 driver depend on the ADI_AXI_ADC symbol.
> The AD9467 driver cannot operate on it's own. It requires the ADI AXI ADC
> driver to stream data (or some similar IIO interface).
> 
> So, the fix here is to make the AD9467 symbol depend on the ADI_AXI_ADC
> symbol. At some point this could become it's own subgroup of high-speed
> ADCs.
> 
> Fixes: be24c65e9fa24 ("iio: adc: adi-axi-adc: add proper Kconfig dependencies")
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>

Acked-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
> 
> Apologies for this being too late.
> I made the patch but forgot it in a local tree.
> 
> Related to discussion:
>    https://lkml.org/lkml/2021/3/18/1007
> 
>  drivers/iio/adc/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index e0667c4b3c08..dda0f1e37ec1 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -249,7 +249,7 @@ config AD799X
>  config AD9467
>  	tristate "Analog Devices AD9467 High Speed ADC driver"
>  	depends on SPI
> -	select ADI_AXI_ADC
> +	depends on ADI_AXI_ADC
>  	help
>  	  Say yes here to build support for Analog Devices:
>  	  * AD9467 16-Bit, 200 MSPS/250 MSPS Analog-to-Digital Converter
> 


-- 
~Randy