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On Wed, Feb 10, 2016 at 10:24:43AM +0530, Raveendra Padasalagi wrote:

quoted

-----Original Message-----
From: Dmitry Torokhov [mailto:dmitry.torokhov at gmail.com]
Sent: 09 February 2016 23:14
To: Raveendra Padasalagi
Cc: Arnd Bergmann; Russell King; devicetree at vger.kernel.org; linux-arm-
kernel at lists.infradead.org; linux-input at vger.kernel.org; Rob Herring;

Pawel

quoted

Moll; Mark Rutland; Ian Campbell; Kumar Gala; Jonathan Richardson; Jon
Mason; Florian Fainelli; Ray Jui; Scott Branden;

linux-kernel at vger.kernel.org;

quoted

bcm-kernel-feedback-list at broadcom.com
Subject: Re: [PATCH 1/3] input: cygnus-update touchscreen dt node

document

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[...]

quoted

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In Cygnus SOC, Touch screen controller registers are shared with ADC
and flex timer IP's.
Using readl/writel could lead to race condition. So this patch is
introduced to take care mutually exclusive access of register's in
such a case.

In the platform's where touchscreen register's are not shared normal
readl/writel could be used.

Are there currently platforms where the registers are not shared? If we

have to

quoted

use regmap to correctly update registers (and thus we need
syscon) then I wonder if we should even attempt to support direct

register

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access by the driver.

Currently there are no platforms without register sharing, but we would
like to keep
the driver generic enough to take care of future SOC's if comes with
dedicated registers
and same touchscreen IP being re-used.

These future SoCs will have a different compatible string and you should 
use that to determine whether reg or syscon is used.

Rob