linux-kernel - [PATCH 1/8] extcon: gpio: Add DT bindings

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Message-Id: <20170924145622.4031-2-linus.walleij@linaro.org>
Date:   Sun, 24 Sep 2017 16:56:15 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        John Stultz <john.stultz@...aro.org>,
        Mike Lockwood <lockwood@...gle.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org
Subject: [PATCH 1/8] extcon: gpio: Add DT bindings

Add some reasonable device tree bindings and also add the cable defines
to the extcon include in <dt-bindings/extcon/connectors.h> since
the GPIO extcon definately need to specify which cable/connector it is
detecting.

Adding the include file makes the (as it happens) Linux numbers into an
ABI, but I do not see any better method. It is possible to define strings
for all cable types but it seems like overkill, just reusing Linux'
enumerators seems like a good idea.

The binding supports any number of GPIOs and connectors, but the driver
currently only supports one connector on one GPIO line.

Cc: devicetree@...r.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 .../devicetree/bindings/extcon/extcon-gpio.txt     | 24 ++++++++++++++
 include/dt-bindings/extcon/connectors.h            | 38 ++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/extcon/extcon-gpio.txt
 create mode 100644 include/dt-bindings/extcon/connectors.h

diff --git a/Documentation/devicetree/bindings/extcon/extcon-gpio.txt b/Documentation/devicetree/bindings/extcon/extcon-gpio.txt
new file mode 100644
index 000000000000..2f5e21b94a64
--- /dev/null
+++ b/Documentation/devicetree/bindings/extcon/extcon-gpio.txt
@@ -0,0 +1,24 @@
+External Connector Using GPIO
+
+Required properties:
+- compatible: should be "extcon-gpio"
+- extcon-gpios: the GPIO lines used for the external connectors
+  See gpio/gpio.txt
+- extcon-connector-types: set to an unsigned integer value arrat representing the types
+  of this connector, matched to the corresponding GPIO lines in the previous array.
+  Those are defined with unique IDs in <dt-bindings/extcon/connectors.h>
+- input-debounce: The number of microseconds to wait for the
+  connector state to stabilize. This property is reused from pin control
+  See pinctrl/pinctrl-bindings.txt
+
+Example:
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/extcon/connectors.h>
+
+extcon {
+	compatible = "extcon-gpio";
+	extcon-gpios = <&gpio0 42 GPIO_ACTIVE_LOW>;
+	extcon-connector-types = <EXTCON_USB>;
+	input-debounce = <20000>; /* 20 ms */
+};
diff --git a/include/dt-bindings/extcon/connectors.h b/include/dt-bindings/extcon/connectors.h
new file mode 100644
index 000000000000..61bed24eaadc
--- /dev/null
+++ b/include/dt-bindings/extcon/connectors.h
@@ -0,0 +1,38 @@
+#ifndef _DT_BINDINGS_EXTCON_CONNECTORS_H
+#define _DT_BINDINGS_EXTCON_CONNECTORS_H
+
+/* USB external connector */
+#define EXTCON_USB		1
+#define EXTCON_USB_HOST		2
+#define EXTCON_CHG_USB_SDP	5	/* Standard Downstream Port */
+#define EXTCON_CHG_USB_DCP	6	/* Dedicated Charging Port */
+#define EXTCON_CHG_USB_CDP	7	/* Charging Downstream Port */
+#define EXTCON_CHG_USB_ACA	8	/* Accessory Charger Adapter */
+#define EXTCON_CHG_USB_FAST	9
+#define EXTCON_CHG_USB_SLOW	10
+#define EXTCON_CHG_WPT		11	/* Wireless Power Transfer */
+#define EXTCON_CHG_USB_PD	12	/* USB Power Delivery */
+/* Jack external connector */
+#define EXTCON_JACK_MICROPHONE	20
+#define EXTCON_JACK_HEADPHONE	21
+#define EXTCON_JACK_LINE_IN	22
+#define EXTCON_JACK_LINE_OUT	23
+#define EXTCON_JACK_VIDEO_IN	24
+#define EXTCON_JACK_VIDEO_OUT	25
+#define EXTCON_JACK_SPDIF_IN	26	/* Sony Philips Digital InterFace */
+#define EXTCON_JACK_SPDIF_OUT	27
+/* Display external connector */
+#define EXTCON_DISP_HDMI	40	/* High-Definition Multimedia Interface */
+#define EXTCON_DISP_MHL		41	/* Mobile High-Definition Link */
+#define EXTCON_DISP_DVI		42	/* Digital Visual Interface */
+#define EXTCON_DISP_VGA		43	/* Video Graphics Array */
+#define EXTCON_DISP_DP		44	/* Display Port */
+#define EXTCON_DISP_HMD		45	/* Head-Mounted Display */
+/* Miscellaneous external connector */
+#define EXTCON_DOCK		60
+#define EXTCON_JIG		61
+#define EXTCON_MECHANICAL	62
+
+#define EXTCON_NUM		63
+
+#endif /* _DT_BINDINGS_EXTCON_CONNECTORS_H */
-- 
2.13.5