linux-kernel - Re: [PATCH v2 1/5] iio: mxs-lradc: change the realbits to 12

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Message-Id: <201307191556.46857.marex@denx.de>
Date:	Fri, 19 Jul 2013 15:56:46 +0200
From:	Marek Vasut <marex@...x.de>
To:	Hector Palacios <hector.palacios@...i.com>
Cc:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org,
	alexandre.belloni@...e-electrons.com, jic23@...nel.org,
	lars@...afoo.de, fabio.estevam@...escale.com
Subject: Re: [PATCH v2 1/5] iio: mxs-lradc: change the realbits to 12

Dear Hector Palacios,

> The LRADC virtual channels have an 18 bit field to store the sum of up
> to 2^5 accumulated samples. The read_raw function however only operates
> over a single sample (12 bit resolution).
> In order to use this field for scaling operations, we need it to be the
> exact resolution value of the LRADC.
> Besides, the driver was using an 18 bit mask (LRADC_CH_VALUE_MASK) to
> report touch coordinates to userland. A 12 bit mask should be used instead
> or else the touch libraries will expect a coordinates range between 0
> and 0x3ffff (18 bits), instead of between 0 and 0xfff (12 bits).
> 
> Signed-off-by: Hector Palacios <hector.palacios@...i.com>

Acked-by: Marek Vasut <marex@...x.de>

Best regards,
Marek Vasut
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