linux-kernel - [PATCH v7 3/6] DTS: gta04: add uart2 child node for w2sg0004 GPS receiver

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Message-Id: <9ebb28aed589aca8e9b5bc5c910f1d2f0d62669d.1525340143.git.hns@goldelico.com>
Date:   Thu,  3 May 2018 11:35:48 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Johan Hovold <johan@...nel.org>, afd@...com,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Kevin Hilman <khilman@...libre.com>,
        Andreas Färber <afaerber@...e.de>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Noralf Trønnes <noralf@...nnes.org>,
        David Lechner <david@...hnology.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v7 3/6] DTS: gta04: add uart2 child node for w2sg0004 GPS receiver

GTA04 has a W2SG0004 module connected to UART2 of the OMAP3
processor. A GPIO can pulse the on/off toggle switch.

Note that there is no WAKEUP output from the W2SG0004,
hence we can't use the generic SirfStar binding.

The VSIM regulator is used to power on/off the LNA of an
external active GPS antenna so that a driver can turn the
LNA off if GPS is not needed to save battery energy.

Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 arch/arm/boot/dts/omap3-gta04.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi b/arch/arm/boot/dts/omap3-gta04.dtsi
index 4170be70460e..1c9e1ccf2346 100644
--- a/arch/arm/boot/dts/omap3-gta04.dtsi
+++ b/arch/arm/boot/dts/omap3-gta04.dtsi
@@ -478,6 +478,13 @@
 &uart2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart2_pins>;
+
+	gps: gps {
+		compatible = "wi2wi,w2sg0004";
+		lna-supply = <&vsim>;   /* LNA regulator */
+		/* GPIO_145: trigger for on/off-impulse for w2sg0004 */
+		enable-gpios = <&gpio5 17 GPIO_ACTIVE_HIGH>;
+	};
 };
 
 &uart3 {
-- 
2.12.2