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SubjectRe: [PATCH v3 3/4] iio: adc: at91_adc: add Kconfig dep on the OF symbol and remove of_match_ptr()
On 30/09/2020 15:52:15+0300, Alexandru Ardelean wrote:
> This tries to solve a warning reported by the lkp bot:
>
> >> drivers/iio/adc/at91_adc.c:1439:34: warning: unused variable
> >> 'at91_adc_dt_ids' [-Wunused-const-variable]
> static const struct of_device_id at91_adc_dt_ids[] = {
> ^
> 1 warning generated.
>
> This warning has appeared after the AT91_ADC driver compilation has been
> enabled via the COMPILE_TEST symbol dependency.
>
> The warning is caused by the 'of_match_ptr()' helper which returns NULL if
> OF is undefined. This driver should build only for device-tree context, so
> a dependency on the OF Kconfig symbol has been added.
> Also, the usage of of_match_ptr() helper has been removed since it
> shouldn't ever return NULL (because the driver should not be built for the
> non-OF context).
>
> Fixes: 4027860dcc4c ("iio: Kconfig: at91_adc: add COMPILE_TEST dependency to driver")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
> drivers/iio/adc/Kconfig | 2 +-
> drivers/iio/adc/at91_adc.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 91ae90514aff..17e9ceb9c6c4 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -295,7 +295,7 @@ config ASPEED_ADC
> config AT91_ADC
> tristate "Atmel AT91 ADC"
> depends on ARCH_AT91 || COMPILE_TEST
> - depends on INPUT && SYSFS
> + depends on INPUT && SYSFS && OF
> select IIO_BUFFER
> select IIO_TRIGGERED_BUFFER
> help
> diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
> index 7d846a2852a5..473bffe84fbd 100644
> --- a/drivers/iio/adc/at91_adc.c
> +++ b/drivers/iio/adc/at91_adc.c
> @@ -1466,7 +1466,7 @@ static struct platform_driver at91_adc_driver = {
> .id_table = at91_adc_ids,
> .driver = {
> .name = DRIVER_NAME,
> - .of_match_table = of_match_ptr(at91_adc_dt_ids),
> + .of_match_table = at91_adc_dt_ids,
> .pm = &at91_adc_pm_ops,
> },
> };
> --
> 2.17.1
>

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

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