From: Dylan Howey <Dylan.Howey@tennantco.com>
To: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
linux-iio@vger.kernel.org
Subject: Re: [PATCH] iio: accel: mma8452: Expose temperature channel
Date: Mon, 24 Feb 2020 15:00:20 -0600 [thread overview]
Message-ID: <20200224210018.GA937@tennantco.com> (raw)
In-Reply-To: <20200214132400.7133bcf5@archlinux>
On 02/14/2020 13:24, Jonathan Cameron wrote:
> So ideally we'd get someone at Freescale to confirm there is a hardware
> rather than a documentation issue (i.e. maybe we need some other magic).
NXP says there's a documentation issue. CTRL_REG6 can only be written
when the device is in standby, similar to the other CTRL_REG* registers.
So I'll need to use mma8452_change_config to set this register. I will
try this out and send a patch.
One other detail - the temperature cannot be buffered by the hwfifo.
If I add hwfifo support, I think the right thing to do would be to
disable hwfifo implicitly if the temperature channel is enabled and
fall back to one interrupt per sample.
--
Dylan
next prev parent reply other threads:[~2020-02-24 21:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-05 20:32 [PATCH] iio: accel: mma8452: Expose temperature channel Dylan Howey
2020-02-08 16:32 ` Jonathan Cameron
2020-02-10 14:26 ` Dylan Howey
2020-02-13 22:04 ` Dylan Howey
2020-02-14 13:24 ` Jonathan Cameron
2020-02-17 14:19 ` Dylan Howey
2020-02-17 18:16 ` Jonathan Cameron
2020-02-24 21:00 ` Dylan Howey [this message]
2020-03-07 11:20 ` Jonathan Cameron
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