linux-kernel - Re: [PATCH 1/3] ti_adc: Update with IIO map interface

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Date:	Wed, 31 Oct 2012 19:07:43 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
CC:	Jonathan Cameron <jic23@....ac.uk>,
	"Patil, Rachna" <rachna@...com>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Koen Kooi <koen@...inion.thruhere.net>,
	Matt Porter <mporter@...com>, Russ Dill <Russ.Dill@...com>,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 1/3] ti_adc: Update with IIO map interface

On 10/31/2012 06:55 PM, Pantelis Antoniou wrote:
> [...]
>>> 	}
>>>
>>> 	indio_dev->channels = chan_array;
>>> +	indio_dev->num_channels = channels;
>>> +
>>> +	size = (channels + 1) * sizeof(struct iio_map);
>>> +	adc_dev->map = kzalloc(size, GFP_KERNEL);
>>> +	if (adc_dev->map == NULL) {
>>> +		kfree(chan_array);
>>> +		return -ENOMEM;
>>> +	}
>>> +
>>> +	for (i = 0; i < indio_dev->num_channels; i++) {
>>> +		adc_dev->map[i].adc_channel_label = chan_array[i].datasheet_name;
>>> +		adc_dev->map[i].consumer_dev_name = "any";
>>> +		adc_dev->map[i].consumer_channel = chan_array[i].datasheet_name;
>>> +	}
>>> +	adc_dev->map[i].adc_channel_label = NULL;
>>> +	adc_dev->map[i].consumer_dev_name = NULL;
>>> +	adc_dev->map[i].consumer_channel = NULL;
>>
>> The map should be passed in via platform data or similar. All the fields of
>> the map depend on the specific user, so you can't use a generic map. In fact
>> if we were able to use a generic map, we wouldn't need a map at all.
> 
> There's no platform data in the board I'm using. It's board-generic using
> device tree only.

That's the 'or similar' ;) Unfortunately we do not have a device tree
binding for IIO yet. But I think we should aim at a interface similar like
we have in other subsystems like the clk, regulator or dma framework.

- Lars
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