67 lines
2.2 KiB
Plaintext
67 lines
2.2 KiB
Plaintext
* Rockchip RK3xxx I2C controller
|
|
|
|
This driver interfaces with the native I2C controller present in Rockchip
|
|
RK3xxx SoCs.
|
|
|
|
Required properties :
|
|
|
|
- reg : Offset and length of the register set for the device
|
|
- compatible: should be one of the following:
|
|
- "rockchip,rk3066-i2c": for rk3066
|
|
- "rockchip,rk3188-i2c": for rk3188
|
|
- "rockchip,rk3228-i2c": for rk3228
|
|
- "rockchip,rk3288-i2c": for rk3288
|
|
- "rockchip,rk3399-i2c": for rk3399
|
|
- interrupts : interrupt number
|
|
- clocks: See ../clock/clock-bindings.txt
|
|
- For older hardware (rk3066, rk3188, rk3228, rk3288):
|
|
- There is one clock that's used both to derive the functional clock
|
|
for the device and as the bus clock.
|
|
- For newer hardware (rk3399): specified by name
|
|
- "i2c": This is used to derive the functional clock.
|
|
- "pclk": This is the bus clock.
|
|
|
|
Required on RK3066, RK3188 :
|
|
|
|
- rockchip,grf : the phandle of the syscon node for the general register
|
|
file (GRF)
|
|
- on those SoCs an alias with the correct I2C bus ID (bit offset in the GRF)
|
|
is also required.
|
|
|
|
Optional properties :
|
|
|
|
- clock-frequency : SCL frequency to use (in Hz). If omitted, 100kHz is used.
|
|
- i2c-scl-rising-time-ns : Number of nanoseconds the SCL signal takes to rise
|
|
(t(r) in I2C specification). If not specified this is assumed to be
|
|
the maximum the specification allows(1000 ns for Standard-mode,
|
|
300 ns for Fast-mode) which might cause slightly slower communication.
|
|
- i2c-scl-falling-time-ns : Number of nanoseconds the SCL signal takes to fall
|
|
(t(f) in the I2C specification). If not specified this is assumed to
|
|
be the maximum the specification allows (300 ns) which might cause
|
|
slightly slower communication.
|
|
- i2c-sda-falling-time-ns : Number of nanoseconds the SDA signal takes to fall
|
|
(t(f) in the I2C specification). If not specified we'll use the SCL
|
|
value since they are the same in nearly all cases.
|
|
|
|
Example:
|
|
|
|
aliases {
|
|
i2c0 = &i2c0;
|
|
}
|
|
|
|
i2c0: i2c@2002d000 {
|
|
compatible = "rockchip,rk3188-i2c";
|
|
reg = <0x2002d000 0x1000>;
|
|
interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
rockchip,grf = <&grf>;
|
|
|
|
clock-names = "i2c";
|
|
clocks = <&cru PCLK_I2C0>;
|
|
|
|
i2c-scl-rising-time-ns = <800>;
|
|
i2c-scl-falling-time-ns = <100>;
|
|
};
|