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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@spreadtrum.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
hifive-unleashed-5.1
Baolin Wang 2017-08-29 11:35:03 +08:00 committed by Wolfram Sang
parent 5ca21c13c9
commit 4058f6dc3b
1 changed files with 31 additions and 0 deletions
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Documentation/devicetree/bindings/i2c/i2c-sprd.txt 100644
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I2C for Spreadtrum platforms
Required properties:
- compatible: Should be "sprd,sc9860-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@70500000 {
compatible = "sprd,sc9860-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>;
};