linux-kernel - Re: [PATCH] iio: ti_am335x_adc: Fix prerequisite for stepid patch

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Message-ID: <20140728100530.GB5068@hercules>
Date:	Mon, 28 Jul 2014 11:05:30 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Jan Kardell <jan.kardell@...liq.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com, Jonathan Cameron <jic23@...nel.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH] iio: ti_am335x_adc: Fix prerequisite for stepid patch

On Fri, Jul 25, 2014 at 01:13:46PM +0200, Jan Kardell wrote:
> Kernel series 3.11 and 3.12 does not initialize scan_index in the
> iio_chan_spec structure as 3.13 and newer does. This is necessary
> for the stepid patch to work, otherwise it even breaks the cases
> that worked before the stepid patch.
> 
> Unfortunately the stepid patch seems to already be in 3.12.25,
> must have missed that inclusion.
> 
> Signed-off-by: Jan Kardell <jan.kardell@...liq.com>
> ---
>  drivers/iio/adc/ti_am335x_adc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index 3ceac3e..6c56418 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -120,6 +120,7 @@ static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
>  		chan->channel = adc_dev->channel_line[i];
>  		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
>  		chan->datasheet_name = chan_name_ain[chan->channel];
> +		chan->scan_index = i;
>  		chan->scan_type.sign = 'u';
>  		chan->scan_type.realbits = 12;
>  		chan->scan_type.storagebits = 32;
> -- 
> 1.8.4.5
> 

Ah, nice catch!

Ideally, I would pick commit ca9a563805f7ae821e3303b1bdbc65d3a3c783ff
("iio: ti_am335x_adc: Add continuous sampling support"), which adds
this scan_index initialisation.  However, this commit doesn't seem be
suitable for a stable kernel, so I'll add this patch to the 3.11.10.14
queue branch.  Thanks a lot, Jan.

Cheers,
--
Luís
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