From: Sam Ravnborg <sam@ravnborg.org>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: "Rob Herring" <robh@kernel.org>,
"Alessandro Zummo" <a.zummo@towertech.it>,
"Andrew Jeffery" <andrew@aj.id.au>,
"Fabio Estevam" <fabio.estevam@nxp.com>,
"Joel Stanley" <joel@jms.id.au>,
"Mark Rutland" <mark.rutland@arm.com>,
"Russell King" <linux@armlinux.org.uk>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Shawn Guo" <shawnguo@kernel.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-rtc@vger.kernel.org, "Søren Andersen" <san@skov.dk>
Subject: Re: [PATCH v1 1/5] dt-binding: rtci-pcf8523: add quartz_load property
Date: Wed, 26 Sep 2018 22:42:52 +0200 [thread overview]
Message-ID: <20180926204252.GA8654@ravnborg.org> (raw)
In-Reply-To: <20180926185121.GF16644@piout.net>
On Wed, Sep 26, 2018 at 08:51:21PM +0200, Alexandre Belloni wrote:
> On 26/09/2018 10:47:08-0500, Rob Herring wrote:
> > > > +Optional property:
> > > > +- nxp,quartz_load_12.5pF: The capacitive load on the quartz is 12.5 pF,
> > > > + which differ from the default value of 7 pF
> > > > +
> > >
> > > The boolean properties usually don't work well for RTCs because people
> > > usually want to keep any previous configuration that may have been done
> > > at the factory or in the bootloader so I would use:
> > >
> > > nxp,quartz_load_fF and this would be either 7000 or 12500.
> >
> > Use '-' rather than '_'.
> >
> > There's already a defined unit suffix of '-picofarads'. If you need
> > '-femtofarads', then please add to property-units.txt. Though I'd prefer
> > not as wouldn't a value of 12 (or 13) be close enough for the needs
> > here?
> >
>
> For that particular RTC, yes but the isl1208 has 0.5pF steps and the
> x1205 has 0.25pf steps. I'd prefer having a single generic property for
> all the RTCs: quartz-load-femtofarads.
I will change to use this, and update property-units.txt too, when I get
back to the patch set in a week or so.
Sam
next prev parent reply other threads:[~2018-09-27 2:57 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180822183555.GA24084@ravnborg.org>
2018-09-07 19:35 ` [PATCH v1 0/5] add quartz load support to NXP rtc drivers Sam Ravnborg
2018-09-07 19:35 ` [PATCH v1 1/5] dt-binding: rtci-pcf8523: add quartz_load property Sam Ravnborg
2018-09-07 21:43 ` Sam Ravnborg
2018-09-13 19:05 ` Alexandre Belloni
2018-09-13 20:44 ` Sam Ravnborg
2018-09-13 20:51 ` Alexandre Belloni
2018-09-26 15:47 ` Rob Herring
2018-09-26 18:51 ` Alexandre Belloni
2018-09-26 20:42 ` Sam Ravnborg [this message]
2018-09-07 19:35 ` [PATCH v1 2/5] dt-binding: rtc-pcf85063: add quartz load property Sam Ravnborg
2018-09-13 19:11 ` Alexandre Belloni
2018-09-07 19:35 ` [PATCH v1 3/5] dts: add nxp,quartz_load_12.5pf to all pcf8523 nodes Sam Ravnborg
2018-09-13 19:14 ` Alexandre Belloni
2018-09-07 19:35 ` [PATCH v1 4/5] rtc: pcf8523: external capacitor configuration Sam Ravnborg
2018-09-13 19:27 ` Alexandre Belloni
2018-09-07 19:35 ` [PATCH v1 5/5] rtc: pcf85063: " Sam Ravnborg
2018-09-13 19:29 ` Alexandre Belloni
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