linux-kernel - Re: [PATCH v4 1/8] dt-bindings: mfd: document stpmic1

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Date:   Fri, 26 Oct 2018 07:46:14 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Pascal PAILLET-LME <p.paillet@...com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        LINUX-WATCHDOG <linux-watchdog@...r.kernel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Enric Balletbo i Serra <eballetbo@...il.com>
Subject: Re: [PATCH v4 1/8] dt-bindings: mfd: document stpmic1

On Thu, 25 Oct 2018, Rob Herring wrote:

> On Thu, Oct 25, 2018 at 4:44 AM Lee Jones <lee.jones@...aro.org> wrote:
> >
> > Rob: please grep your name for some feedback.

[Moved to the top]

> > I'm surprised Rob allowed you to add register bits in a DT property?
> 
> Yeah, they are certainly questionable and not something we encourage,
> but the alternative would be dozens of properties which only apply for
> this one device and just get translated back to register values.

I don't see how this device is any different to the 100's of devices
which are already supported in DT.

> > On Thu, 18 Oct 2018, Pascal PAILLET-LME wrote:
> >
> > > From: pascal paillet <p.paillet@...com>
> 
> > > +Optional parent device properties:
> > > +- st,main-control-register:
> > > +     -bit 1: Power cycling will be performed on turn OFF condition
> > > +     -bit 2: PWRCTRL is functional
> > > +     -bit 3: PWRCTRL active high
> > > +- st,pads-pull-register:
> > > +     -bit 1: WAKEUP pull down is not active
> > > +     -bit 2: PWRCTRL pull up is active
> > > +     -bit 3: PWRCTRL pull down is active
> > > +     -bit 4: WAKEUP detector is disabled

This should be part of the Pinctrl configuration/driver.

And Pinctrl probably already has properties for this?

> > > +- st,vin-control-register:
> > > +     -bit 0: VINLOW monitoring is enabled
> > > +     -bit [1...3]: VINLOW rising threshold
> > > +             000 VINOK_f + 50mV
> > > +             001 VINOK_f + 100mV
> > > +             010 VINOK_f + 150mV
> > > +             011 VINOK_f + 200mV
> > > +             100 VINOK_f + 250mV
> > > +             101 VINOK_f + 300mV
> > > +             110 VINOK_f + 350mV
> > > +             111 VINOK_f + 400mV
> > > +     -bit [4...5]: VINLOW hyst
> > > +             00 100mV
> > > +             01 200mV
> > > +             10 300mV
> > > +             11 400mV
> > > +     -bit 6: SW_OUT detector is disabled
> > > +     -bit 7: SW_IN detector is enabled.

This should be part of the Regulator configuration/driver?

> > > +- st,usb-control-register:
> > > +     -bit 3: SW_OUT current limit
> > > +             0: 600mA
> > > +             1: 1.1A
> > > +     -bit 4: VBUS_OTG discharge is enabled
> > > +     -bit 5: SW_OUT discharge is enabled
> > > +     -bit 6: VBUS_OTG detection is enabled
> > > +     -bit 7: BOOST_OVP is disabled

This should be part of the USB configuration/driver?

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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