| * 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 "rockchip,rk3066-i2c", "rockchip,rk3188-i2c", |
| "rockchip,rk3228-i2c" or "rockchip,rk3288-i2c". |
| - interrupts : interrupt number |
| - clocks : parent 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>; |
| }; |
