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Filename Latest commit message Latest commit date
Maarten ter Huurne 5a304e1a4e IIO: Ingenic JZ47xx: Set clock divider on probe
The SADC component can run at up to 8 MHz on JZ4725B, but is fed
a 12 MHz input clock (EXT). Divide it by two to get 6 MHz, then
set up another divider to match, to produce a 10us clock.

If the clock dividers are left on their power-on defaults (a divider
of 1), the SADC mostly works, but will occasionally produce erroneous
readings. This led to button presses being detected out of nowhere on
the RS90 every few minutes. With this change, no ghost button presses
were logged in almost a day worth of testing.

The ADCLK register for configuring clock dividers doesn't exist on
JZ4740, so avoid writing it there.

A function has been introduced rather than a flag because there is a lot
of variation between the ADCLK registers on JZ47xx SoCs, both in
the internal layout of the register and in the frequency range
supported by the SADC. So this solution should make it easier
to add support for other JZ47xx SoCs later.

Fixes: 1a78daea10 ("iio: adc: probe should set clock divider")
Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-07-14 16:02:08 +01:00
arch MMC core: 2019-07-11 18:11:21 -07:00
block
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto USB / PHY patches for 5.3-rc1 2019-07-11 15:40:06 -07:00
Documentation chrome platform changes for v5.3 2019-07-11 18:45:29 -07:00
drivers IIO: Ingenic JZ47xx: Set clock divider on probe 2019-07-14 16:02:08 +01:00
fs Char / Misc driver patches for 5.3-rc1 2019-07-11 15:34:05 -07:00
include chrome platform changes for v5.3 2019-07-11 18:45:29 -07:00
init
ipc
kernel Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching 2019-07-11 15:30:05 -07:00
lib Char / Misc driver patches for 5.3-rc1 2019-07-11 15:34:05 -07:00
LICENSES
mm Char / Misc driver patches for 5.3-rc1 2019-07-11 15:34:05 -07:00
net SCSI sg on 20190709 2019-07-11 15:17:41 -07:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
scripts Devicetree updates for v5.3: 2019-07-11 18:35:30 -07:00
security security/loadpin improvement 2019-07-11 14:42:44 -07:00
sound chrome platform changes for v5.3 2019-07-11 18:45:29 -07:00
tools Staging / IIO driver update for 5.3-rc1 2019-07-11 15:36:02 -07:00
usr
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MAINTAINERS Devicetree updates for v5.3: 2019-07-11 18:35:30 -07:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.