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SubjectRe: [PATCH] arm: dts: gta04: add gps support
On Mon, Jan 28, 2019 at 05:44:29PM +0100, Andreas Kemnade wrote:
> On Mon, 28 Jan 2019 08:53:56 +0100
> Johan Hovold <johan@kernel.org> wrote:
>
> > On Fri, Jan 25, 2019 at 08:43:10PM +0100, Andreas Kemnade wrote:
> > > The GTA04 has a w2sg0004 or w2sg0084 gps chip. Not detectable
> > > which one is mounted so use the compatibility entry for w2sg0004
> > > for all which will work for both.
> > >
> > > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> > > ---
> > > w2sg0004 bindings (together with the corresponding support is in
> > > https://git.kernel.org/pub/scm/linux/kernel/git/johan/gnss gnss-next)
> > > arch/arm/boot/dts/omap3-gta04.dtsi | 13 +++++++++++++
> > > 1 file changed, 13 insertions(+)

> > > + gps: gps {
> >
> > The node should be named "gnss" as per the binding.
> >
> > > + compatible = "wi2wi,w2sg0004";
> > > + pinctrl-names = "default";
> > > + pinctrl-0 = <&gps_pins>;
> > > + sirf,onoff-gpios = <&gpio5 17 GPIO_ACTIVE_HIGH>;
> > > + lna-supply = <&vsim>;
> >
> > Also, the vcc-supply is a required property.
> >
> well, it is not require in the driver and it has different behavior
> (on even when not opened if on-off is there) than the lna-supply used
> here. So maybe fix the binding documentation?

The device-tree describes hardware, and how a particular driver happens
to implement a binding is not relevant.

That said, there is a bit of an on-going, shall we say philosophical,
debate about this. The regulator maintainer takes a firm position that
all mandatory physical supplies should be represented in firmware

https://lore.kernel.org/lkml/20181123133126.GF2089@sirena.org.uk/T/#u
https://lore.kernel.org/lkml/20180409102244.GB11532@sirena.org.uk/T/#u

while Rob appears to take a slightly different stance on fixed
regulators while admitting that this an issue which has not yet been
fully resolved:

https://lore.kernel.org/lkml/20180425171123.xhyoay3nu463btoq@rob-hp-laptop/T/#u

Since this is a new binding, and the hardware requires the vcc supply
and this is reflected in the binding, I think you should add a fixed
regulator. At least until you hear otherwise. ;)

Johan

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