[Letux-kernel] [PATCH] arm: dts: gta04: add gps support

Andreas Kemnade andreas at kemnade.info
Mon Jan 28 17:44:29 CET 2019


On Mon, 28 Jan 2019 08:53:56 +0100
Johan Hovold <johan at 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 at 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(+)
> > 
> > diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi b/arch/arm/boot/dts/omap3-gta04.dtsi
> > index e53d32691308..d58c117e429f 100644
> > --- a/arch/arm/boot/dts/omap3-gta04.dtsi
> > +++ b/arch/arm/boot/dts/omap3-gta04.dtsi
> > @@ -312,6 +312,12 @@  
> >  		>;  
> >         };
> >  
> > +	gps_pins: pinmux_gps_pins {
> > +		pinctrl-single,pins = <
> > +			OMAP3_CORE1_IOPAD(0x2176, PIN_OUTPUT_PULLDOWN | MUX_MODE4) /* gpio145 */
> > +		>;
> > +	};
> > +
> >  	hdq_pins: hdq_pins {
> >  		pinctrl-single,pins = <
> >  			OMAP3_CORE1_IOPAD(0x21c6, PIN_INPUT_PULLUP | MUX_MODE0) /* i2c3_sda.hdq */
> > @@ -644,6 +650,13 @@
> >  &uart2 {
> >  	pinctrl-names = "default";
> >  	pinctrl-0 = <&uart2_pins>;
> > +	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?

Regards,
Andreas
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