| NVIDIA Tegra20/Tegra30/Tegra114 I2C controller driver. |
| |
| Required properties: |
| - compatible : For Tegra20, must be one of "nvidia,tegra20-i2c-dvc" or |
| "nvidia,tegra20-i2c". For Tegra30, must be "nvidia,tegra30-i2c". |
| For Tegra114, must be "nvidia,tegra114-i2c". Otherwise, must be |
| "nvidia,<chip>-i2c", plus at least one of the above, where <chip> is |
| tegra124, tegra132, or tegra210. |
| Details of compatible are as follows: |
| nvidia,tegra20-i2c-dvc: Tegra20 has specific I2C controller called as DVC I2C |
| controller. This only support master mode of I2C communication. Register |
| interface/offset and interrupts handling are different than generic I2C |
| controller. Driver of DVC I2C controller is only compatible with |
| "nvidia,tegra20-i2c-dvc". |
| nvidia,tegra20-i2c: Tegra20 has 4 generic I2C controller. This can support |
| master and slave mode of I2C communication. The i2c-tegra driver only |
| support master mode of I2C communication. Driver of I2C controller is |
| only compatible with "nvidia,tegra20-i2c". |
| nvidia,tegra30-i2c: Tegra30 has 5 generic I2C controller. This controller is |
| very much similar to Tegra20 I2C controller with additional feature: |
| Continue Transfer Support. This feature helps to implement M_NO_START |
| as per I2C core API transfer flags. Driver of I2C controller is |
| compatible with "nvidia,tegra30-i2c" to enable the continue transfer |
| support. This is also compatible with "nvidia,tegra20-i2c" without |
| continue transfer support. |
| nvidia,tegra114-i2c: Tegra114 has 5 generic I2C controller. This controller is |
| very much similar to Tegra30 I2C controller with some hardware |
| modification: |
| - Tegra30/Tegra20 I2C controller has 2 clock source called div-clk and |
| fast-clk. Tegra114 has only one clock source called as div-clk and |
| hence clock mechanism is changed in I2C controller. |
| - Tegra30/Tegra20 I2C controller has enabled per packet transfer by |
| default and there is no way to disable it. Tegra114 has this |
| interrupt disable by default and SW need to enable explicitly. |
| Due to above changes, Tegra114 I2C driver makes incompatible with |
| previous hardware driver. Hence, tegra114 I2C controller is compatible |
| with "nvidia,tegra114-i2c". |
| - reg: Should contain I2C controller registers physical address and length. |
| - interrupts: Should contain I2C controller interrupts. |
| - address-cells: Address cells for I2C device address. |
| - size-cells: Size of the I2C device address. |
| - clocks: Must contain an entry for each entry in clock-names. |
| See ../clocks/clock-bindings.txt for details. |
| - clock-names: Must include the following entries: |
| Tegra20/Tegra30: |
| - div-clk |
| - fast-clk |
| Tegra114: |
| - div-clk |
| - resets: Must contain an entry for each entry in reset-names. |
| See ../reset/reset.txt for details. |
| - reset-names: Must include the following entries: |
| - i2c |
| - dmas: Must contain an entry for each entry in clock-names. |
| See ../dma/dma.txt for details. |
| - dma-names: Must include the following entries: |
| - rx |
| - tx |
| |
| Example: |
| |
| i2c@7000c000 { |
| compatible = "nvidia,tegra20-i2c"; |
| reg = <0x7000c000 0x100>; |
| interrupts = <0 38 0x04>; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| clocks = <&tegra_car 12>, <&tegra_car 124>; |
| clock-names = "div-clk", "fast-clk"; |
| resets = <&tegra_car 12>; |
| reset-names = "i2c"; |
| dmas = <&apbdma 16>, <&apbdma 16>; |
| dma-names = "rx", "tx"; |
| status = "disabled"; |
| }; |
