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

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Message-Id: <C105B6BF-8407-4484-826A-A979E16B6B44@antoniou-consulting.com>
Date:	Wed, 31 Oct 2012 20:12:40 +0200
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
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 Oct 31, 2012, at 8:07 PM, Lars-Peter Clausen wrote:

> 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

So in the meantime no-one can use IIO ADC in any OF only platform.

In the meantime, this is pretty reasonable IMO. This is only for a specific 
board with known channel mappings.

I'm not out to fix IIO, I'm out to fix a single board.

Regards

-- Pantelis --
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