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Date:	Fri, 08 Aug 2014 09:24:00 +0100
From:	Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:	Luis Henriques <luis.henriques@...onical.com>,
	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 28/07/14 11:05, Luis Henriques wrote:
> 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.
Indeed, thanks for picking this up.
Acked-by: Jonathan Cameron <jic23@...nel.org>
for any other stable trees where it is relevant (won't do any harm on any where
it isn't!)
>
> Cheers,
> --
> Luís

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