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Date:   Thu, 17 Sep 2020 13:58:48 +0200
From:   Jonathan =?utf-8?Q?Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>
To:     Rob Herring <robh@kernel.org>
Cc:     Andreas Kemnade <andreas@kemnade.info>,
        Jonathan =?utf-8?Q?Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Lee Jones <lee.jones@linaro.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>,
        Alessandro Zummo <a.zummo@towertech.it>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Heiko Stuebner <heiko.stuebner@theobroma-systems.com>,
        Stephan Gerhold <stephan@gerhold.net>,
        Lubomir Rintel <lkundrak@v3.sk>,
        Mark Brown <broonie@kernel.org>, allen <allen.chen@ite.com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        devicetree@vger.kernel.org,
        Linux PWM List <linux-pwm@vger.kernel.org>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        Heiko Stuebner <heiko@sntech.de>,
        Josua Mayer <josua.mayer@jm0.eu>,
        Arnd Bergmann <arnd@arndb.de>, Daniel Palmer <daniel@0x0f.com>
Subject: Re: [PATCH v2 04/10] dt-bindings: pwm: Add bindings for PWM function
 in Netronix EC
Message-ID: <20200917115848.GH3306@latitude>
References: <20200905133230.1014581-1-j.neuschaefer@gmx.net>
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 <20200915005443.GA604385@bogus>
 <20200915082348.2f6fff7a@aktux>
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On Tue, Sep 15, 2020 at 08:31:55AM -0600, Rob Herring wrote:
> On Tue, Sep 15, 2020 at 12:24 AM Andreas Kemnade <andreas@kemnade.info> w=
rote:
> > On Mon, 14 Sep 2020 18:54:43 -0600 Rob Herring <robh@kernel.org> wrote:
[...]
> > > Just move this to the parent and make the parent a pwm provider. Ther=
e's
> > > no need for child nodes for this or the rtc.
> > >
> > hmm, there are apparently devices without rtc. If there is a child node
> > for the rtc, the corresponding devicetrees could disable rtc by not
> > having that node.
> > But maybe using the controller version is also feasible for that task.
>=20
> If not probeable, then the compatible string should distinguish that.

Okay.

It's even simpler in some cases: The firmware version reported by the EC
should tell us if it's one that is known to have no RTC.

That said, I don't have a good overview of the different variants of
this device.


Thanks,
Jonathan Neusch=C3=A4fer

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