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