linux-kernel - Re: [PATCH] iio: adc: stm32-dfsdm: fix st,adc-alt-channel property handling

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Message-ID: <5243c2c5a8f3dd24f40e30a695e2a3d4f948f388.camel@gmail.com>
Date: Fri, 03 Oct 2025 07:15:56 +0100
From: Nuno Sá <noname.nuno@...il.com>
To: Olivier Moysan <olivier.moysan@...s.st.com>, Jonathan Cameron	
 <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, Nuno
 Sá	 <nuno.sa@...log.com>, Andy Shevchenko
 <andy@...nel.org>, Maxime Coquelin	 <mcoquelin.stm32@...il.com>, Alexandre
 Torgue <alexandre.torgue@...s.st.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, 	linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, 	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: stm32-dfsdm: fix st,adc-alt-channel property
 handling

On Thu, 2025-10-02 at 13:22 +0200, Olivier Moysan wrote:
> Initially st,adc-alt-channel property was defined as an enum in the DFSDM
> binding. The DFSDM binding has been changed to use the new IIO backend
> framework, along with the adoption of IIO generic channels.
> In this new binding st,adc-alt-channel is defined as a boolean property,
> but it is still handled has an enum in DFSDM driver.
> Fix st,adc-alt-channel property handling in DFSDM driver.
> 
> Fixes: 3208fa0cd919 ("iio: adc: stm32-dfsdm: adopt generic channels bindings")
> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
> ---

Reviewed-by: Nuno Sá <nuno.sa@...log.com>

>  drivers/iio/adc/stm32-dfsdm-adc.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 74b1b4dc6e81..9664b9bd75d4 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -725,9 +725,8 @@ static int stm32_dfsdm_generic_channel_parse_of(struct
> stm32_dfsdm *dfsdm,
>  	}
>  	df_ch->src = val;
>  
> -	ret = fwnode_property_read_u32(node, "st,adc-alt-channel", &df_ch-
> >alt_si);
> -	if (ret != -EINVAL)
> -		df_ch->alt_si = 0;
> +	if (fwnode_property_present(node, "st,adc-alt-channel"))
> +		df_ch->alt_si = 1;
>  
>  	if (adc->dev_data->type == DFSDM_IIO) {
>  		backend = devm_iio_backend_fwnode_get(&indio_dev->dev, NULL,
> node);