i2c: sunxi: add P2WI DT bindings documentation

P2WI (Push/Pull 2 Wire Interface) is an SMBus like bus used to communicate
with some PMICs (like the AXP221).

Document P2WI DT bindings which are pretty much the same as the one defined
for the marvell's mv64xxx controller.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Boris BREZILLON 2014-06-11 11:17:29 +02:00 committed by Wolfram Sang
parent c41aa3ce93
commit bb336ba0aa
1 changed files with 41 additions and 0 deletions

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* Allwinner P2WI (Push/Pull 2 Wire Interface) controller
Required properties :
- reg : Offset and length of the register set for the device.
- compatible : Should one of the following:
- "allwinner,sun6i-a31-p2wi"
- interrupts : The interrupt line connected to the P2WI peripheral.
- clocks : The gate clk connected to the P2WI peripheral.
- resets : The reset line connected to the P2WI peripheral.
Optional properties :
- clock-frequency : Desired P2WI bus clock frequency in Hz. If not set the
default frequency is 100kHz
A P2WI may contain one child node encoding a P2WI slave device.
Slave device properties:
Required properties:
- reg : the I2C slave address used during the initialization
process to switch from I2C to P2WI mode
Example:
p2wi@01f03400 {
compatible = "allwinner,sun6i-a31-p2wi";
reg = <0x01f03400 0x400>;
interrupts = <0 39 4>;
clocks = <&apb0_gates 3>;
clock-frequency = <6000000>;
resets = <&apb0_rst 3>;
axp221: pmic@68 {
compatible = "x-powers,axp221";
reg = <0x68>;
/* ... */
};
};