From: ladis@linux-mips.org (Ladislav Michl)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC 5/5] pwm: pwm-omap-dmtimer: Add capture functionality
Date: Mon, 8 Jan 2018 23:06:02 +0100 [thread overview]
Message-ID: <20180108220602.GA17615@lenoch> (raw)
In-Reply-To: <20180108215931.GV3875@atomide.com>
On Mon, Jan 08, 2018 at 01:59:31PM -0800, Tony Lindgren wrote:
> * Ladislav Michl <ladis@linux-mips.org> [180108 15:46]:
> > Here it seems hardware can capture both edges, but I do not see a way
> > how to tell it I want start from either low to high or high to low
> > transition. Clues?
>
> At least dm3730 TRM documents TCM bits [9:8] for TCLR, but you
> probably know that already..
>
> If you're having hard time getting things starting, maybe something
> like this helps:
>
> stop timer in TCLR register
> configure timer in TCLR
> write some value to TLDR, maybe 0?
> set ST bit in TCLR to start
Let me clarify it a bit more. I have no problem starting timer and capture
events. I just didn't find a way how to tell hardware I want to start
with for example rising edge, so rising edge goes to TCAR1 and failing edge
to TCAR2. Substracting those gives pulse width.
ladis
next prev parent reply other threads:[~2018-01-08 22:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-08 15:39 [PATCH 0/5] Add capture functionality to OMAP pwm driver Ladislav Michl
2018-01-08 15:40 ` [PATCH 1/5] clocksource: timer-dm: Make unexported functions static Ladislav Michl
2018-01-08 15:41 ` [PATCH 2/5] clocksource: timer-dm: Check prescaler value Ladislav Michl
2018-01-08 15:41 ` [PATCH 3/5] pwm: pwm-omap-dmtimer: Fix frequency when using prescaler Ladislav Michl
2018-01-08 15:42 ` [PATCH 4/5] clocksource: timer-dm: Add event capture Ladislav Michl
2018-01-08 21:51 ` [PATCH 0/5] Add capture functionality to OMAP pwm driver Tony Lindgren
2018-01-08 21:57 ` Ladislav Michl
[not found] ` <20180108154336.GE4077@lenoch>
2018-01-08 21:59 ` [RFC 5/5] pwm: pwm-omap-dmtimer: Add capture functionality Tony Lindgren
2018-01-08 22:06 ` Ladislav Michl [this message]
2018-01-08 22:13 ` Tony Lindgren
2018-01-08 22:26 ` Ladislav Michl
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