Re: [PATCH v4] iio: adc: ti-ads1015: fix conversion when CONFIG_PM is not set

[Jonathan Cameron <jic23@kernel.org>]

On Mon,  3 Aug 2020 08:04:05 +0300
Maxim Kochetkov <fido_max@inbox.ru> wrote:

> To stop conversion ads1015_set_power_state() function call unimplemented
> function __pm_runtime_suspend() from pm_runtime_put_autosuspend()
> if CONFIG_PM is not set.
> In case of CONFIG_PM is not set: __pm_runtime_suspend() returns -ENOSYS,
> so ads1015_read_raw() failed because ads1015_set_power_state() returns an
> error.
> 
> If CONFIG_PM is disabled, there is no need to start/stop conversion.
> Fix it by adding return 0 function variant if CONFIG_PM is not set.
> 
> Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
> Fixes: ecc24e72f437 ("iio: adc: Add TI ADS1015 ADC driver support")
> Tested-by: Maxim Kiselev <bigunclemax@gmail.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Note that I didn't actually give this tag.  It must be formally
given by someone rather than saying a patch looks fine.

Personally I don't give reviewed-by tags for IIO patches as they will
have my sign off anyway and that also reflects having reviewed them.

Applied to the fixes-togreg branch of iio.git (which will be rebased shortly
after rc1 is out) and marked for stable.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/ti-ads1015.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
> index 5ea4f45d6bad..64fe3b2a6ec6 100644
> --- a/drivers/iio/adc/ti-ads1015.c
> +++ b/drivers/iio/adc/ti-ads1015.c
> @@ -316,6 +316,7 @@ static const struct iio_chan_spec ads1115_channels[] = {
>  	IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
>  };
>  
> +#ifdef CONFIG_PM
>  static int ads1015_set_power_state(struct ads1015_data *data, bool on)
>  {
>  	int ret;
> @@ -333,6 +334,15 @@ static int ads1015_set_power_state(struct ads1015_data *data, bool on)
>  	return ret < 0 ? ret : 0;
>  }
>  
> +#else /* !CONFIG_PM */
> +
> +static int ads1015_set_power_state(struct ads1015_data *data, bool on)
> +{
> +	return 0;
> +}
> +
> +#endif /* !CONFIG_PM */
> +
>  static
>  int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
>  {