From: Rob Herring <robh@kernel.org>
To: Johan Hovold <johan@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Kevin Hilman <khilman@baylibre.com>,
Loys Ollivier <lollivier@baylibre.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>,
linux-amlogic@lists.infradead.org,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 2/4] dt-bindings: gnss: add mediatek binding
Date: Tue, 12 Feb 2019 15:18:46 -0600 [thread overview]
Message-ID: <CAL_JsqJPhuDDsEMvpVizewTuehOZTc84d+8Hq7o8C+O4UrBjYw@mail.gmail.com> (raw)
In-Reply-To: <20190211092251.GV4686@localhost>
On Mon, Feb 11, 2019 at 3:23 AM Johan Hovold <johan@kernel.org> wrote:
>
> On Wed, Jan 30, 2019 at 09:50:16AM -0600, Rob Herring wrote:
> > On Mon, Jan 28, 2019 at 05:37:59PM +0100, Loys Ollivier wrote:
> > > Add binding for Mediatek-based GNSS receivers.
> > >
> > > Signed-off-by: Loys Ollivier <lollivier@baylibre.com>
> > > ---
> > >
> > > v3:
> > > Removed the I2C and SPI interfaces references.
> > > Removed the "mediatek,mt3339" compatible line.
> > > Added the optional propertied (reset, fix)
> > > Added the pin names for the optional properties.
> > >
> > > v2:
> > > Renamed bindings from Globaltop/gtop to Mediatek/mtk.
> > > Moved current-speed as an optional propertie.
> > > Removed the status line in the example.
> > > Added "mediatek,mt3339" compatible.
> > >
> > > .../devicetree/bindings/gnss/mediatek.txt | 37 ++++++++++++++++++++++
> > > 1 file changed, 37 insertions(+)
> > > create mode 100644 Documentation/devicetree/bindings/gnss/mediatek.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/gnss/mediatek.txt b/Documentation/devicetree/bindings/gnss/mediatek.txt
> > > new file mode 100644
> > > index 000000000000..00650d81c5c8
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/gnss/mediatek.txt
> > > @@ -0,0 +1,37 @@
> > > +Mediatek-based GNSS Receiver DT binding
> > > +
> > > +Mediatek chipsets are used in GNSS-receiver modules produced by several
> > > +vendors and can use an UART interface.
>
> s/an/a/
>
> > > +
> > > +Please see Documentation/devicetree/bindings/gnss/gnss.txt for generic
> > > +properties.
> > > +
> > > +Required properties:
> > > +
> > > +- compatible : Must be
> > > +
> > > + "globaltop,pa6h"
> > > +
> > > +- vcc-supply : Main voltage regulator (pin name: VCC)
> > > +
> > > +Optional properties:
> > > +
> > > +- gtop,reset-gpios : GPIO used to reset the device
> > > + (pin name: RESET, NRESET)
> >
> > reset-gpios is the standard name.
> >
> > > +- gtop,fix-gpios : GPIO used to determine device position fix state
> > > + (pin name: FIX, 3D_FIX)
>
> I'm thinking we might need a standard name for fix-gpios as well. This
> isn't a feature that is globaltop (or mediatek) specific, and other
> manufacturers provide similar functionality through pins named UI_FIX,
> or even LCKIND (lock indicator).
>
> The pin is typically used to drive an indicator LED AFAIU, but the
> characteristics of the signal varies from device to device (fw to fw),
> for example, pulse when no lock and low otherwise, or pulse when a 2d or
> 3d-fix is acquired, etc.
>
> I'm not sure how useful the pulsing would be for software, but someone
> might find a use for it in some form.
>
> Rob, is this something we want to keep in the binding, and if so, how
> about using a generic name such as "gnss-fix-gpios"?
Sure. As long as details like being a pulse and when the pulse occurs
are implied by compatible string. So we don't get an endless addition
of properties to describe those.
Rob
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next prev parent reply other threads:[~2019-02-12 21:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-28 16:37 [PATCH v3 0/4] Add driver for Mediatek-based GNSS receivers Loys Ollivier
2019-01-28 16:37 ` [PATCH v3 1/4] dt-bindings: Add vendor prefix for "GlobalTop Technology, Inc." Loys Ollivier
2019-01-30 15:48 ` Rob Herring
2019-02-01 8:17 ` Loys Ollivier
2019-01-28 16:37 ` [PATCH v3 2/4] dt-bindings: gnss: add mediatek binding Loys Ollivier
2019-01-30 15:50 ` Rob Herring
2019-02-11 9:22 ` Johan Hovold
2019-02-11 14:06 ` Loys Ollivier
2019-02-13 9:34 ` Johan Hovold
2019-02-12 21:18 ` Rob Herring [this message]
2019-02-13 9:31 ` Johan Hovold
2019-01-28 16:38 ` [PATCH v3 3/4] gnss: add mtk receiver type support Loys Ollivier
2019-01-28 16:38 ` [PATCH v3 4/4] gnss: add driver for mediatek receivers Loys Ollivier
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