From: Marek Vasut <marex@denx.de>
To: Hector Palacios <hector.palacios@digi.com>
Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree-discuss@lists.ozlabs.org,
alexandre.belloni@free-electrons.com, jic23@kernel.org,
lars@metafoo.de, fabio.estevam@freescale.com
Subject: Re: [PATCH v2 1/5] iio: mxs-lradc: change the realbits to 12
Date: Fri, 19 Jul 2013 15:56:46 +0200 [thread overview]
Message-ID: <201307191556.46857.marex@denx.de> (raw)
In-Reply-To: <1374225208-28940-2-git-send-email-hector.palacios@digi.com>
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@digi.com>
Acked-by: Marek Vasut <marex@denx.de>
Best regards,
Marek Vasut
WARNING: multiple messages have this Message-ID (diff)
From: Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
To: Hector Palacios <hector.palacios-i7dp0qKlBMg@public.gmane.org>
Cc: linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org,
jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org,
fabio.estevam-KZfg59tc24xl57MIdRCFDg@public.gmane.org
Subject: Re: [PATCH v2 1/5] iio: mxs-lradc: change the realbits to 12
Date: Fri, 19 Jul 2013 15:56:46 +0200 [thread overview]
Message-ID: <201307191556.46857.marex@denx.de> (raw)
In-Reply-To: <1374225208-28940-2-git-send-email-hector.palacios-i7dp0qKlBMg@public.gmane.org>
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-i7dp0qKlBMg@public.gmane.org>
Acked-by: Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
Best regards,
Marek Vasut
next prev parent reply other threads:[~2013-07-19 13:56 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-19 9:13 [PATCH v2 0/5] iio: mxs-lradc: add support to optional divider_by_two Hector Palacios
2013-07-19 9:13 ` Hector Palacios
2013-07-19 9:13 ` [PATCH v2 1/5] iio: mxs-lradc: change the realbits to 12 Hector Palacios
2013-07-19 9:13 ` Hector Palacios
2013-07-19 13:56 ` Marek Vasut [this message]
2013-07-19 13:56 ` Marek Vasut
2013-07-19 17:09 ` Alexandre Belloni
2013-07-19 17:09 ` Alexandre Belloni
2013-07-19 9:13 ` [PATCH v2 2/5] ARM: dts: add reference voltage property for MXS LRADC Hector Palacios
2013-07-19 9:13 ` Hector Palacios
2013-07-19 13:58 ` Marek Vasut
2013-07-19 13:58 ` Marek Vasut
2013-07-19 17:10 ` Alexandre Belloni
2013-07-19 17:10 ` Alexandre Belloni
2013-07-19 9:13 ` [PATCH v2 3/5] iio: mxs-lradc: add scale attribute to channels Hector Palacios
2013-07-19 9:13 ` Hector Palacios
2013-07-19 14:30 ` Marek Vasut
2013-07-19 14:30 ` Marek Vasut
2013-07-19 15:44 ` Hector Palacios
2013-07-19 15:44 ` Hector Palacios
2013-07-19 16:14 ` Marek Vasut
2013-07-19 16:14 ` Marek Vasut
2013-07-22 7:22 ` Hector Palacios
2013-07-22 7:22 ` Hector Palacios
2013-07-22 7:42 ` Marek Vasut
2013-07-22 7:42 ` Marek Vasut
2013-07-22 7:46 ` Hector Palacios
2013-07-22 7:46 ` Hector Palacios
2013-07-22 7:58 ` Marek Vasut
2013-07-19 17:06 ` Alexandre Belloni
2013-07-19 17:06 ` Alexandre Belloni
2013-07-22 7:26 ` Hector Palacios
2013-07-22 7:26 ` Hector Palacios
2013-07-19 9:13 ` [PATCH v2 4/5] iio: mxs-lradc: add scale_available file " Hector Palacios
2013-07-19 9:13 ` Hector Palacios
2013-07-19 17:20 ` Alexandre Belloni
2013-07-19 17:20 ` Alexandre Belloni
2013-07-19 9:13 ` [PATCH v2 5/5] iio: mxs-lradc: add write_raw function to modify scale Hector Palacios
2013-07-19 9:13 ` Hector Palacios
2013-07-19 14:39 ` Marek Vasut
2013-07-19 14:39 ` Marek Vasut
2013-07-19 15:31 ` Hector Palacios
2013-07-19 15:31 ` Hector Palacios
2013-07-19 16:17 ` Marek Vasut
2013-07-19 16:17 ` Marek Vasut
2013-07-19 16:22 ` Hector Palacios
2013-07-19 20:23 ` Jonathan Cameron
2013-07-19 20:23 ` Jonathan Cameron
2013-07-20 19:00 ` Marek Vasut
2013-07-20 19:00 ` Marek Vasut
2013-07-19 20:32 ` Jonathan Cameron
2013-07-19 20:32 ` Jonathan Cameron
2013-07-22 8:01 ` Hector Palacios
2013-07-22 8:01 ` Hector Palacios
2013-07-19 17:21 ` Alexandre Belloni
2013-07-19 17:21 ` Alexandre Belloni
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