linux-kernel - Re: [PATCH] iio: inkern: Add of_xlate function to struct iio

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Message-ID: <54425998.7060808@kernel.org>
Date:	Sat, 18 Oct 2014 13:14:16 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Lars-Peter Clausen <lars@...afoo.de>,
	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	Sachin Kamat <sachin.kamat@...aro.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	John Stultz <john.stultz@...aro.org>,
	linux-iio@...r.kernel.org, svarbanov@...sol.com,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] iio: inkern: Add of_xlate function to struct iio_dev

On 18/10/14 12:50, Lars-Peter Clausen wrote:
> On 10/18/2014 01:42 PM, Jonathan Cameron wrote:
>> On 02/10/14 13:32, Ivan T. Ivanov wrote:
>>> When #iio-cells is greater than '0', the driver could provide
>>> a custom of_xlate function that reads the *args* and returns
>>> the appropriate index in registered IIO channels array.
>>>
>>> Add simple translation function, suitable for the most 1:1
>>> mapped channels in IIO chips, and use it when driver did not
>>> provide custom implementation.
>>>
>>> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
>> Any more comments on this?  Been sat a while and the discussions seems
>> to have died out.
>>
>> As Ivan has pointed out, very similar approaches are used
>> elsewhere (gpio for example).
> 
> Looks good to me:
> 
> Reviewed-by: Lars-Peter Clausen <lars@...afoo.de>
> 
> When we initially added the DT support to IIO I was hoping that we can get away
> with just using the simple and generic xlate function for all devices. But it
> looks as if some more complex devices need to overwrite it. We should be careful
> about adding new driver specific xlate implementations and make sure that it is
> actually needed.
> 
> One thing we might want to consider though is instead of adding the xlate
> callback to the iio_dev struct add it to the iio_info struct since it should be
> the same for different device instances of the same driver. And this is also
> where all the other callbacks are.
Good point - would definitely prefer that.

J
> 
> - Lars
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