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

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Date:   Fri, 26 Oct 2018 09:48:11 +0000
From:   Pascal PAILLET-LME <p.paillet@...com>
To:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>
CC:     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" <linux-input@...r.kernel.org>,
        "devicetree@...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

Hello Lee,

Le 10/26/2018 08:46 AM, Lee Jones a écrit :
> 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?
I will remove this in the next version.
>>>> +- 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?
I will also remove this in the next version. I think this could be 
handled by an hardware monitor future 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?
>
I will also remove this in the next version. And I'm going to add active 
discharge ops in the regulator driver.

Thank you !
pascal