From: Andrew Lunn <andrew@lunn.ch>
To: "Paweł Dembicki" <paweldembicki@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Olof Johansson <olof@lixom.net>,
soc@kernel.org, Gregory Clement <gregory.clement@bootlin.com>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
Shawn Guo <shawnguo@kernel.org>, Sam Ravnborg <sam@ravnborg.org>,
Linus Walleij <linus.walleij@linaro.org>,
Corentin Labbe <clabbe@baylibre.com>,
Oleksij Rempel <linux@rempel-privat.de>,
Hao Fang <fanghao11@huawei.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
linux-kernel@vger.kernel.org,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 2/2] ARM: dts: kirkwood: Add Ctera C-200 V1 board
Date: Tue, 15 Feb 2022 22:14:24 +0100 [thread overview]
Message-ID: <YgwXsIRR/B9UmBOD@lunn.ch> (raw)
In-Reply-To: <CAJN1Kkz3_z8M1j_mtOJzriUWj1m6iAEdZSZFg-zB2Gw2BYY4wA@mail.gmail.com>
> > Thanks for adding a comment. So you need something like a PWM driving
> > it? Have you tried playing with drivers/input/misc/pwm-beeper.c ?
>
> It use a PWM device. Driver gpio-pwm isn't accepted in mainline so far.
>
> > Some of the mvebu family have a simple PWM functionality as part of
> > the GPIO controller. I don't remember if kirkwood has this.
>
> Kirkwood have very simple blink mode only: GPIO pin make visible blinks.
[Goes and looks at the datasheet]
Yes, Kirkwood has fixed rate blinking. It is the later generation of
devices which have true PWM capabilities.
Andrew
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next prev parent reply other threads:[~2022-02-15 21:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-15 16:39 [PATCH v2 2/2] ARM: dts: kirkwood: Add Ctera C-200 V1 board Pawel Dembicki
2022-02-15 18:25 ` Andrew Lunn
2022-02-15 20:56 ` Paweł Dembicki
2022-02-15 21:14 ` Andrew Lunn [this message]
2022-02-15 21:14 ` Andrew Lunn
2022-02-28 16:24 ` Gregory CLEMENT
2022-02-28 23:43 ` Linus Walleij
2022-03-01 20:32 ` Paweł Dembicki
2022-03-01 22:04 ` Linus Walleij
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