linux-kernel - Re: [PATCH v3] iio: st_sensors: don't always auto-enable I2C and SPI interface drivers

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Date:   Mon, 10 Jan 2022 20:04:35 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        Cai Huoqing <caihuoqing@...du.com>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] iio: st_sensors: don't always auto-enable I2C and SPI
 interface drivers



10.01.2022 18:53, Andy Shevchenko wrote:
> On Mon, Jan 10, 2022 at 06:24:32PM +0300, Nikita Yushchenko wrote:
>> This patch makes I2C and SPI interface drivers for STMicroelectronics
>> sensor chips individually selectable via Kconfig.
>>
>> The default is kept unchanged - I2C and SPI interface drivers are still
>> selected by default if the corresponding bus support is available.
>>
>> However, the patch makes it possible to explicitly disable drivers
>> that are not needed for a particular target.
> 
> ...
> 
> The same question as per v2.
> 
>> +	default I2C && IIO_ST_ACCEL_3AXIS
> 
> What will be the results when I2C=y and the second ones =m?

$ grep CONFIG_I2C= .config
CONFIG_I2C=y
$ grep IIO_ST_ACCEL .config
CONFIG_IIO_ST_ACCEL_3AXIS=m
CONFIG_IIO_ST_ACCEL_I2C_3AXIS=m
# CONFIG_IIO_ST_ACCEL_SPI_3AXIS is not set

$ vim .config
<remove CONFIG_IIO_ST_ACCEL_I2C_3AXIS line>
$ grep IIO_ST_ACCEL .config
CONFIG_IIO_ST_ACCEL_3AXIS=m
# CONFIG_IIO_ST_ACCEL_SPI_3AXIS is not set

$ make menuconfig
<immediately exit>

$ grep IIO_ST_ACCEL .config
CONFIG_IIO_ST_ACCEL_3AXIS=m
CONFIG_IIO_ST_ACCEL_I2C_3AXIS=m
# CONFIG_IIO_ST_ACCEL_SPI_3AXIS is not set

CONFIG_IIO_ST_ACCEL_I2C_3AXIS was set to =m by default. I believe this is correct behavior.

Nikita