linux-kernel - Re: [PATCH 2/2] Input: add touchscreen support for TS-4800

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Message-ID: <20151213045858.GB22780@dtor-ws>
Date:	Sat, 12 Dec 2015 20:58:58 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Damien Riegel <damien.riegel@...oirfairelinux.com>
Cc:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, kernel@...oirfairelinux.com
Subject: Re: [PATCH 2/2] Input: add touchscreen support for TS-4800

Hi Damien,

On Thu, Dec 10, 2015 at 11:11:12AM -0500, Damien Riegel wrote:
> On this board, the touchscreen, an ads7843, is not handled directly by
> Linux but by a companion FPGA. This FPGA is memory-mapped and the IP
> design is very similar to the mk712.

...

> +
> +	poll_dev = devm_input_allocate_polled_device(&pdev->dev);
> +	if (!poll_dev)
> +		return -ENOMEM;

I wonder how useful touchscreen implemented as polling device is. Isn't
there an interrupt line for it?

Thanks.

-- 
Dmitry
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