From: William Breathitt Gray <vilhelm.gray@gmail.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: gregkh@linuxfoundation.org, jic23@kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
fabrice.gasnier@st.com, benjamin.gaignard@st.com,
knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net,
akpm@linux-foundation.org, david@lechnology.com,
robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org,
leoyang.li@nxp.com, daniel.lezcano@linaro.org,
tglx@linutronix.de, thierry.reding@gmail.com, esben@haabendal.dk,
linux-pwm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
patrick.havelange@essensium.com,
Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: Re: [PATCH v10 01/18] counter: Introduce the Generic Counter interface
Date: Tue, 9 Apr 2019 13:57:28 +0900 [thread overview]
Message-ID: <20190409045728.GA2842@icarus> (raw)
In-Reply-To: <20190408215515.GA27592@amd>
On Mon, Apr 08, 2019 at 11:55:15PM +0200, Pavel Machek wrote:
> Hi!
>
> > +const char *const counter_count_direction_str[2] = {
> > + [COUNTER_COUNT_DIRECTION_FORWARD] = "forward",
> > + [COUNTER_COUNT_DIRECTION_BACKWARD] = "backward"
> > +};
> > +EXPORT_SYMBOL_GPL(counter_count_direction_str);
> > +
> > +const char *const counter_count_mode_str[4] = {
> > + [COUNTER_COUNT_MODE_NORMAL] = "normal",
> > + [COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit",
> > + [COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle",
> > + [COUNTER_COUNT_MODE_MODULO_N] = "modulo-n"
> > +};
> > +EXPORT_SYMBOL_GPL(counter_count_mode_str);
>
> Dunno. Exporting const tables saying "forward" and "backward". Can we
> ... somehow make it work without need to export this?
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Right now there are only have 4 counter devices supported in this
patchset, but it is expected that support for a greater variety of
devices will be added. For these future cases, new count directions will
be added to match their functionality.
For example, suppose support for a rotary encoder device is added. These
type of devices do not move forward/backward but rather rotate. In these
cases, the following count directions may be added:
[COUNTER_COUNT_DIRECTION_CLOCKWISE] = "clockwise",
[COUNTER_COUNT_DIRECTION_COUNTERCLOCKWISE] = "counterclockwise"
Or as another example, suppose support for a two-axis precision
positioning table is added. These devices support positioning in a
cartesian coordinate system. In these cases, spatial direction may serve
as useful count directions:
[COUNTER_COUNT_DIRECTION_NORTH] = "north",
[COUNTER_COUNT_DIRECTION_NORTHEAST] = "northeast",
[COUNTER_COUNT_DIRECTION_EAST] = "east",
[COUNTER_COUNT_DIRECTION_SOUTHEAST] = "southeast",
[COUNTER_COUNT_DIRECTION_SOUTH] = "south",
[COUNTER_COUNT_DIRECTION_SOUTHWEST] = "southwest",
[COUNTER_COUNT_DIRECTION_WEST] = "west",
[COUNTER_COUNT_DIRECTION_NORTHWEST] = "northwest"
A const table is conveinent in these scenarios because support for new
count directions may be easily added by simple entry into the table.
William Breathitt Gray
next prev parent reply other threads:[~2019-04-09 4:56 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-02 6:30 [PATCH v10 00/18] Introduce the Counter subsystem William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 01/18] counter: Introduce the Generic Counter interface William Breathitt Gray
2019-04-08 21:55 ` Pavel Machek
2019-04-09 4:57 ` William Breathitt Gray [this message]
2019-04-02 6:30 ` [PATCH v10 02/18] counter: Documentation: Add Generic Counter sysfs documentation William Breathitt Gray
2019-04-08 21:55 ` Pavel Machek
2019-04-09 5:07 ` William Breathitt Gray
2019-04-09 13:12 ` David Lechner
2019-04-02 6:30 ` [PATCH v10 03/18] docs: Add Generic Counter interface documentation William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 04/18] iio: 104-quad-8: Update license boilerplate William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 05/18] counter: 104-quad-8: Add Generic Counter interface support William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 06/18] counter: 104-quad-8: Documentation: Add Generic Counter sysfs documentation William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 07/18] counter: Add STM32 Timer quadrature encoder William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 08/18] dt-bindings: counter: Document stm32 " William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 09/18] counter: stm32-lptimer: add counter device William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 10/18] dt-bindings: counter: Adjust dt-bindings for STM32 lptimer move William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 11/18] iio: counter: Add deprecation markings for IIO Counter attributes William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 12/18] include/fsl: add common FlexTimer #defines in a separate header William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 13/18] drivers/pwm: pwm-fsl-ftm: use common header for FlexTimer #defines William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 14/18] drivers/clocksource: timer-fsl-ftm: " William Breathitt Gray
2019-04-25 21:41 ` Daniel Lezcano
2019-04-02 6:30 ` [PATCH v10 15/18] dt-bindings: counter: ftm-quaddec William Breathitt Gray
2019-04-26 14:10 ` Rob Herring
2019-04-02 6:30 ` [PATCH v10 16/18] counter: add FlexTimer Module Quadrature decoder counter driver William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 17/18] counter: ftm-quaddec: Documentation: Add specific counter sysfs documentation William Breathitt Gray
2019-04-02 6:30 ` [PATCH v10 18/18] LS1021A: dtsi: add ftm quad decoder entries William Breathitt Gray
2019-04-07 14:25 ` [PATCH v10 00/18] Introduce the Counter subsystem Jonathan Cameron
2019-04-25 19:36 ` Greg KH
2019-04-27 11:49 ` Jonathan Cameron
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