On Wed, 5 Jul 2017 10:35:10 +0800
Dong Aisheng [off-list ref] wrote:

The Timer/PWM Module (TPM) supports input capture, output compare,
and the generation of PWM signals to control electric motor and power
management applications. The counter, compare and capture registers
are clocked by an asynchronous clock that can remain enabled in low
power modes. TPM can support global counter bus where one TPM drives
the counter bus for the others, provided bit width is the same.

This patch only adds the timer support. PWM would be added later.

Hi Dong,

Not relevant to this patch - just an observation!

Just came across this thread and took a look at the hardware. I see
some of the timers (particularly the flextimers) support quadrature
encoder modes.  Just thought I'd point you at some on going discussions
on the IIO list (linux-iio at vger.kernel.org) trying to improve the
interface for such devices.  Might be of interest (or not depending on
whether support for that functionality is of interest!)

http://marc.info/?l=linux-iio&m=149904379731556&w=2

Jonathan

ChangeLog:
v3->v4:
 * also add ETIME explanation in function
v2->v3:
 * address a few minor comments from Daniel Lezcano
 * add more explaination on ETIME check in commit message
v1->v2:
 * change to readl/writel from __raw_readl/writel according to Arnd's
   suggestion to avoid endian issue
 * add help information in Kconfig
 * add more error checking

Dong Aisheng (2):
  dt-bindings: timer: add nxp tpm timer binding doc
  timer: imx-tpm: add imx tpm timer support

 .../devicetree/bindings/timer/nxp,tpm-timer.txt    |  28 +++
 drivers/clocksource/Kconfig                        |   8 +
 drivers/clocksource/Makefile                       |   1 +
 drivers/clocksource/timer-imx-tpm.c                | 239
+++++++++++++++++++++ 4 files changed, 276 insertions(+)
 create mode 100644
Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt create mode
100644 drivers/clocksource/timer-imx-tpm.c