forked from luck/tmp_suning_uos_patched
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:
parent
c41aa3ce93
commit
bb336ba0aa
41
Documentation/devicetree/bindings/i2c/i2c-sunxi-p2wi.txt
Normal file
41
Documentation/devicetree/bindings/i2c/i2c-sunxi-p2wi.txt
Normal file
@ -0,0 +1,41 @@
|
||||
|
||||
* 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>;
|
||||
|
||||
/* ... */
|
||||
};
|
||||
};
|
Loading…
Reference in New Issue
Block a user