linux-kernel - RE: [EXT] Re: [v3,1/2] dt-bindings: rtc: pcf85263/pcf85363: add some properties

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Message-ID: <DB7PR04MB4490B81B55B223555181D1808FB60@DB7PR04MB4490.eurprd04.prod.outlook.com>
Date:   Tue, 10 Sep 2019 01:41:39 +0000
From:   Biwen Li <biwen.li@....com>
To:     'Martin Fuzzey' <martin.fuzzey@...wbird.group>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        Leo Li <leoyang.li@....com>
CC:     "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Martin Fuzzey <mfuzzey@...keon.com>
Subject: RE: [EXT] Re: [v3,1/2] dt-bindings: rtc: pcf85263/pcf85363: add some
 properties

> 
> On 03/09/2019 08:18, Biwen Li wrote:
> > diff --git a/Documentation/devicetree/bindings/rtc/pcf85363.txt
> > b/Documentation/devicetree/bindings/rtc/pcf85363.txt
> > index 94adc1cf93d9..588f688b30d1 100644
> > --- a/Documentation/devicetree/bindings/rtc/pcf85363.txt
> > +++ b/Documentation/devicetree/bindings/rtc/pcf85363.txt
> > @@ -8,10 +8,39 @@ Required properties:
> >   Optional properties:
> >   - interrupts: IRQ line for the RTC (not implemented).
> >
> > +- interrupt-output-pin: The interrupt output pin must be
> > +  "INTA" or "INTB", default value is "INTA"
> > +
> 
> 
> The hardware has 2 interrupt pins which can be mapped to various interrupt
> sources (alarm1, alarm2, periodic, ...)
> 
> Currently the driver only supports alarm1.
> 
> It is even possible to use both pins for the same interrupt (eg if INTA were
> wired to the SoC, INTB to a PMIC and both used for alarm...)
> 
> 
> So maybe it would be better to have
> 
> alarm1-interrupt-output-pin: The interrupt output pin used for the alarm
> function. Must be "INTA", "INTB" or "BOTH"
I will fix it in v4.
> 
> Then, if and when other types of interrupts are supported by the driver new
> properties could be added for them.
> 
> 
> 
> > +- quartz-load-femtofarads: The internal capacitor to select for the quartz:
> > +     PCF85263_QUARTZCAP_7pF          [0]
> > +     PCF85263_QUARTZCAP_6pF          [1]
> > +     PCF85263_QUARTZCAP_12p5pF       [2] DEFAULT
> > +
> 
> 
> The standard DT property "quartz-load-femtofarads" takes the real physical
> value in femto Farads ie values should be 7000, 6000, 12500 without
> defines.

Ok, I will remove these defines in v4.
> 
> 
> > +- nxp,quartz-drive-strength: Drive strength for the quartz:
> > +     PCF85263_QUARTZDRIVE_100ko      [0] DEFAULT
> > +     PCF85263_QUARTZDRIVE_60ko       [1]
> > +     PCF85263_QUARTZDRIVE_500ko      [2]
> > +
> 
> 
> Not sure about this.
> 
> Wouldn't it be better to either use a real impedence value in ohms (like load
> property above, even though it is a vendor specific value) rather than a
> define, or defines for "Low, Medium, High"?
Ok, I will replace defines with a real impedence value in v4.
> 
> 
> Martin
>