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From: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Damien Riegel
	<damien.riegel-4ysUXcep3aM1wj+D4I0NRVaTQe2KTcn/@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	kernel-4ysUXcep3aM1wj+D4I0NRVaTQe2KTcn/@public.gmane.org
Subject: Re: [PATCH 2/2] Input: add touchscreen support for TS-4800
Date: Sat, 12 Dec 2015 20:58:58 -0800	[thread overview]
Message-ID: <20151213045858.GB22780@dtor-ws> (raw)
In-Reply-To: <1449763872-572-2-git-send-email-damien.riegel-4ysUXcep3aM1wj+D4I0NRVaTQe2KTcn/@public.gmane.org>

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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WARNING: multiple messages have this Message-ID (diff)
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Damien Riegel <damien.riegel@savoirfairelinux.com>
Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
	devicetree@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Pawel Moll <pawel.moll@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Kumar Gala <galak@codeaurora.org>,
	kernel@savoirfairelinux.com
Subject: Re: [PATCH 2/2] Input: add touchscreen support for TS-4800
Date: Sat, 12 Dec 2015 20:58:58 -0800	[thread overview]
Message-ID: <20151213045858.GB22780@dtor-ws> (raw)
In-Reply-To: <1449763872-572-2-git-send-email-damien.riegel@savoirfairelinux.com>

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

  parent reply	other threads:[~2015-12-13  4:58 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-10 16:11 [PATCH 1/2] Input: add touchscreen bindings for TS-4800 Damien Riegel
     [not found] ` <1449763872-572-1-git-send-email-damien.riegel-4ysUXcep3aM1wj+D4I0NRVaTQe2KTcn/@public.gmane.org>
2015-12-10 16:11   ` [PATCH 2/2] Input: add touchscreen support " Damien Riegel
2015-12-10 16:11     ` Damien Riegel
     [not found]     ` <1449763872-572-2-git-send-email-damien.riegel-4ysUXcep3aM1wj+D4I0NRVaTQe2KTcn/@public.gmane.org>
2015-12-13  4:58       ` Dmitry Torokhov [this message]
2015-12-13  4:58         ` Dmitry Torokhov
2015-12-13 20:55         ` Damien Riegel
2015-12-17  4:11       ` Dmitry Torokhov
2015-12-17  4:11         ` Dmitry Torokhov
2015-12-11  3:39 ` [PATCH 1/2] Input: add touchscreen bindings " Rob Herring

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