linux-kernel - [PATCH 1/2] devicetree: Add UCS1002 USB Port Power Controller binding

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Message-Id: <1453799541-5445-2-git-send-email-enric.balletbo@collabora.com>
Date:	Tue, 26 Jan 2016 10:12:20 +0100
From:	Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Martyn Welch <martyn.welch@...labora.com>
Subject: [PATCH 1/2] devicetree: Add UCS1002 USB Port Power Controller binding

The UCS1002-2 provides a USB port power switch for precise control of up
to 2.5 amperes continuous current.

You can add support to your board with current binding.

Example:

    ucs1002: ucs1002@57 {
             compatible = "microchip,ucs1002";
             reg = <0x57>;
             microchip,pin-ignore;
    };

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---
 .../devicetree/bindings/power/ucs1002.txt          | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/ucs1002.txt

diff --git a/Documentation/devicetree/bindings/power/ucs1002.txt b/Documentation/devicetree/bindings/power/ucs1002.txt
new file mode 100644
index 0000000..1b89f0a
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/ucs1002.txt
@@ -0,0 +1,47 @@
+UCS1002-2 Programmable USB Port Power Controller with Charger Emulation bindings
+
+Required properties:
+- compatible: "microchip,ucs1002"
+- reg: integer, the I2C address of the device.
+
+Required properties (if pin-ignore functionality is not set):
+- em-gpios: which GPIO to use for EM_EN pin.
+- pwr-gpios: which GPIO to use for PWR_EN pin.
+- m1-gpios: which GPIO to use for M1 pin.
+- m2-gpios: which GPIO to use for M2 pin.
+
+Optional properties:
+- interrupt-parent: the phandle of the interrupt controller that services
+    interrupts for this device.
+- interrupts: interrupt specifiers for two interrupt sources.
+    - First interrupt specifier is for A_DET interrupt.
+    - Second interrupt specifier is for ALERT interrupt.
+- microchip,current-limit: integer, maximum current in mA. Note that the default
+    value is based on the resistor on the COMM_SEL/ILIM pin and this value cannot
+    be changed to be higher than hardware set value. Accepted values are: 500000,
+    900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000 (uA)
+- microchip,pin-ignore: boolean, if present uses I2C for configuration, otherwise,
+    we must provide EM_EN, M1 and M2 gpio mapping.
+
+Example (poll):
+
+	ucs1002: ucs1002@57 {
+		compatible = "microchip,ucs1002";
+		reg = <0x57>;
+		microchip,current-limit = <2000000>;
+		microchip,pin-ignore;
+	};
+
+Example (interrupts + pin control):
+
+	ucs1002: ucs1002@57 {
+		compatible = "microchip,ucs1002";
+		reg = <0x57>;
+		interrupt-parent = <&gpio0>;
+		interrupts = <30 0>, <31 0>;
+		microchip,current-limit = <2000000>;
+		em-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
+		m1-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>;
+		m2-gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
+		pwr-gpios = <&gpio1 19 0>;
+	};
-- 
2.1.0