linux-kernel - [PATCHv3 3/4] dt-bindings: i2c: Add Altera I2C Controller

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Message-Id: <1496447559-19782-4-git-send-email-thor.thayer@linux.intel.com>
Date:   Fri,  2 Jun 2017 18:52:38 -0500
From:   thor.thayer@...ux.intel.com
To:     wsa@...-dreams.de, robh+dt@...nel.org, mark.rutland@....com,
        dinguyen@...nel.org, thor.thayer@...ux.intel.com
Cc:     davem@...emloft.net, gregkh@...uxfoundation.org,
        mchehab@...nel.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCHv3 3/4] dt-bindings: i2c: Add Altera I2C Controller

From: Thor Thayer <thor.thayer@...ux.intel.com>

Add the documentation to support the Altera synthesizable
logic I2C Controller in FPGA.

Signed-off-by: Thor Thayer <thor.thayer@...ux.intel.com>
---
v2  Change the subject to identify dt-bindings
    Add synthesizable logic to description.
    Change compatible string to "altr,softip-i2c"
    Make description of clock phandle singular since 1 clock.
    Remove altr, from fifo-size
    Specify fifo-size is in bytes.
v3  Add version to compatible string "altr,softip-i2c-v1.0"
    Add for use in FPGA in description.
---
 .../devicetree/bindings/i2c/i2c-altera.txt         | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-altera.txt

diff --git a/Documentation/devicetree/bindings/i2c/i2c-altera.txt b/Documentation/devicetree/bindings/i2c/i2c-altera.txt
new file mode 100644
index 0000000..767664f
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-altera.txt
@@ -0,0 +1,39 @@
+* Altera I2C Controller
+* This is Altera's synthesizable logic block I2C Controller for use
+* in Altera's FPGAs.
+
+Required properties :
+ - compatible : should be "altr,softip-i2c-v1.0"
+ - reg        : Offset and length of the register set for the device
+ - interrupts : <IRQ> where IRQ is the interrupt number.
+ - clocks     : phandle to input clock.
+ - #address-cells = <1>;
+ - #size-cells = <0>;
+
+Recommended properties :
+ - clock-frequency : desired I2C bus clock frequency in Hz.
+
+Optional properties :
+ - fifo-size : Size of the RX and TX FIFOs in bytes.
+ - Child nodes conforming to i2c bus binding
+
+Example :
+
+	i2c@...080000 {
+		compatible = "altr,softip-i2c-v1.0";
+		reg = <0x00000001 0x00080000 0x00000040>;
+		interrupt-parent = <&intc>;
+		interrupts = <0 43 4>;
+		clocks = <&clk_0>;
+		clock-frequency = <100000>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		fifo-size = <4>;
+
+		eeprom@51 {
+			compatible = "atmel,24c32";
+			reg = <0x51>;
+			pagesize = <32>;
+		};
+	};
+
-- 
2.7.4