linux-kernel - Re: [PATCH v2 04/10] dt-bindings: pwm: Add bindings for PWM function in Netronix EC

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Date:   Thu, 17 Sep 2020 13:58:48 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Rob Herring <robh@...nel.org>
Cc:     Andreas Kemnade <andreas@...nade.info>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>, allen <allen.chen@....com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Josua Mayer <josua.mayer@....eu>,
        Arnd Bergmann <arnd@...db.de>, Daniel Palmer <daniel@...f.com>
Subject: Re: [PATCH v2 04/10] dt-bindings: pwm: Add bindings for PWM function
 in Netronix EC

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@...nade.info> wrote:
> > On Mon, 14 Sep 2020 18:54:43 -0600 Rob Herring <robh@...nel.org> wrote:
[...]
> > > Just move this to the parent and make the parent a pwm provider. There'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.
> 
> 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 Neuschäfer

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