linux-kernel - [PATCH v3 2/5] dt/bindings: Add a serial/UART attached device binding

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Message-Id: <20170125202343.30923-3-robh@kernel.org>
Date:   Wed, 25 Jan 2017 14:23:40 -0600
From:   Rob Herring <robh@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Jiri Slaby <jslaby@...e.com>,
        Sebastian Reichel <sre@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Dr . H . Nikolaus Schaller" <hns@...delico.com>,
        Peter Hurley <peter@...leysoftware.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     Loic Poulain <loic.poulain@...el.com>, Pavel Machek <pavel@....cz>,
        NeilBrown <neil@...wn.name>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/5] dt/bindings: Add a serial/UART attached device binding

Add a common binding for describing serial/UART attached devices. Common
examples are Bluetooth, WiFi, NFC and GPS devices.

Serial attached devices are represented as child nodes of a UART node.
This may need to be extended for more complex devices with multiple
interfaces, but for the simple cases a child node is sufficient.

Signed-off-by: Rob Herring <robh@...nel.org>
---
v3:
- no change

v2:
- Drop reg property
- Add max-speed property

 .../devicetree/bindings/serial/slave-device.txt    | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/serial/slave-device.txt

diff --git a/Documentation/devicetree/bindings/serial/slave-device.txt b/Documentation/devicetree/bindings/serial/slave-device.txt
new file mode 100644
index 000000000000..f66037928f5f
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/slave-device.txt
@@ -0,0 +1,36 @@
+Serial Slave Device DT binding
+
+This documents the binding structure and common properties for serial
+attached devices. Common examples include Bluetooth, WiFi, NFC and GPS
+devices.
+
+Serial attached devices shall be a child node of the host UART device the
+slave device is attached to. It is expected that the attached device is
+the only child node of the UART device. The slave device node name shall
+reflect the generic type of device for the node.
+
+Required Properties:
+
+- compatible 	: A string reflecting the vendor and specific device the node
+		  represents.
+
+Optional Properties:
+
+- max-speed	: The maximum baud rate the device operates at. This should
+		  only be present if the maximum is less than the slave device
+		  can support. For example, a particular board has some signal
+		  quality issue or the host processor can't support higher
+		  baud rates.
+
+Example:
+
+serial@...4 {
+	compatible = "ns16550a";
+	interrupts = <1>;
+
+	bluetooth {
+		compatible = "brcm,bcm43341-bt";
+		interrupt-parent = <&gpio>;
+		interrupts = <10>;
+	};
+};
-- 
2.10.1