linux-kernel - [PATCH v3 1/2] i2c: qup: Add device tree bindings information

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Date:	Fri, 17 Jan 2014 15:03:38 -0800
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Wolfram Sang <wsa@...-dreams.de>,
	Grant Likely <grant.likely@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	James Ralston <james.d.ralston@...el.com>,
	Bill Brown <bill.e.brown@...el.com>,
	Matt Porter <matt.porter@...aro.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-arm-msm@...r.kernel.org>
Subject: [PATCH v3 1/2] i2c: qup: Add device tree bindings information

From: "Ivan T. Ivanov" <iivanov@...sol.com>

The Qualcomm Universal Peripherial (QUP) wraps I2C mini-core and
provide input and output FIFO's for it. I2C controller can operate
as master with supported bus speeds of 100Kbps and 400Kbps.

Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
[bjorn: reformulated part of binding description and cleaned up example]
Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
---
 .../devicetree/bindings/i2c/qcom,i2c-qup.txt       | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt

diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
new file mode 100644
index 0000000..a99711b
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
@@ -0,0 +1,41 @@
+Qualcomm Universal Peripheral (QUP) I2C controller
+
+Required properties:
+ - compatible: Should be "qcom,i2c-qup".
+ - reg: Should contain QUP register address and length.
+ - interrupts: Should contain I2C interrupt.
+
+ - clocks: Should contain the core clock and the AHB clock.
+ - clock-names: Should be "core" for the core clock and "iface" for the
+                AHB clock.
+
+ - #address-cells: Should be <1> Address cells for i2c device address
+ - #size-cells: Should be <0> as i2c addresses have no size component
+
+Optional properties:
+ - clock-frequency: Should specify the desired i2c bus clock frequency in Hz,
+                    default is 100kHz if omitted.
+
+Child nodes should conform to i2c bus binding.
+
+Example:
+
+ i2c2: i2c@...24000 {
+ 	compatible = "qcom,i2c-qup";
+ 	reg = <0xf9924000 0x1000>;
+ 	interrupts = <0 96 0>;
+
+ 	clocks = <&gcc_blsp1_qup2_i2c_apps_clk>, <&gcc_blsp1_ahb_clk>;
+ 	clock-names = "core", "iface";
+
+ 	clock-frequency = <355000>;
+
+ 	#address-cells = <1>;
+ 	#size-cells = <0>;
+
+ 	dummy@60 {
+ 		compatible = "dummy";
+ 		reg = <0x60>;
+ 	};
+ };
+
-- 
1.8.2.2

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