linux-kernel - [PATCH 1/2] dt-bindings: i2c: Add Spreadtrum I2C controller documentation

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Message-ID: <7bc5c69030b6e491cfb2519eb1b21c1b0adc70c3.1497525667.git.baolin.wang@spreadtrum.com>
Date:   Thu, 15 Jun 2017 19:30:07 +0800
From:   Baolin Wang <baolin.wang@...eadtrum.com>
To:     <wsa@...-dreams.de>, <mark.rutland@....com>, <robh+dt@...nel.org>
CC:     <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <broonie@...nel.org>,
        <baolin.wang@...aro.org>, <baolin.wang@...eadtrum.com>
Subject: [PATCH 1/2] dt-bindings: i2c: Add Spreadtrum I2C controller documentation

This patch adds the binding documentation for Spreadtrum I2C
controller device.

Signed-off-by: Baolin Wang <baolin.wang@...eadtrum.com>
---
 Documentation/devicetree/bindings/i2c/i2c-sprd.txt |   31 ++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-sprd.txt

diff --git a/Documentation/devicetree/bindings/i2c/i2c-sprd.txt b/Documentation/devicetree/bindings/i2c/i2c-sprd.txt
new file mode 100644
index 0000000..f285e5b
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-sprd.txt
@@ -0,0 +1,31 @@
+I2C for Spreadtrum platforms
+
+Required properties:
+- compatible: Should be "sprd,r8p0-i2c".
+- reg: Specify the physical base address of the controller and length
+  of memory mapped region.
+- interrupts: Should contain I2C interrupt.
+- clock-names: Should contain following entries:
+  "i2c" for I2C clock,
+  "source" for I2C source (parent) clock,
+  "enable" for I2C module enable clock.
+- clocks: Should contain a clock specifier for each entry in clock-names.
+- clock-frequency: Constains desired I2C bus clock frequency in Hz.
+- #address-cells: Should be 1 to describe address cells for I2C device address.
+- #size-cells: Should be 0 means no size cell for I2C device address.
+
+Optional properties:
+- Child nodes conforming to I2C bus binding
+
+Examples:
+i2c0: i2c@...00000 {
+	compatible = "sprd,r8p0-i2c";
+	reg = <0 0x70500000 0 0x1000>;
+	interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
+	clock-names = "i2c", "source", "enable";
+	clocks = <&clk_i2c3>, <&ext_26m>, <&clk_ap_apb_gates 11>;
+	clock-frequency = <400000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+};
+
-- 
1.7.9.5