forked from Minki/linux
ed520c90b3
Update all the Tegra DT bindings to require the standard dmas/dma-names properties rather than non-standard nvidia,dma-request-selector property. This is a DT-ABI-incompatible change. It is the second of two changes required for me to consider the Tegra DT bindings as stable, the other being the previous conversion to the common reset bindings. Signed-off-by: Stephen Warren <swarren@nvidia.com>
76 lines
3.1 KiB
Plaintext
76 lines
3.1 KiB
Plaintext
NVIDIA Tegra20/Tegra30/Tegra114 I2C controller driver.
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Required properties:
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- compatible : should be:
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"nvidia,tegra114-i2c"
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"nvidia,tegra30-i2c"
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"nvidia,tegra20-i2c"
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"nvidia,tegra20-i2c-dvc"
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Details of compatible are as follows:
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nvidia,tegra20-i2c-dvc: Tegra20 has specific I2C controller called as DVC I2C
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controller. This only support master mode of I2C communication. Register
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interface/offset and interrupts handling are different than generic I2C
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controller. Driver of DVC I2C controller is only compatible with
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"nvidia,tegra20-i2c-dvc".
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nvidia,tegra20-i2c: Tegra20 has 4 generic I2C controller. This can support
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master and slave mode of I2C communication. The i2c-tegra driver only
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support master mode of I2C communication. Driver of I2C controller is
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only compatible with "nvidia,tegra20-i2c".
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nvidia,tegra30-i2c: Tegra30 has 5 generic I2C controller. This controller is
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very much similar to Tegra20 I2C controller with additional feature:
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Continue Transfer Support. This feature helps to implement M_NO_START
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as per I2C core API transfer flags. Driver of I2C controller is
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compatible with "nvidia,tegra30-i2c" to enable the continue transfer
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support. This is also compatible with "nvidia,tegra20-i2c" without
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continue transfer support.
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nvidia,tegra114-i2c: Tegra114 has 5 generic I2C controller. This controller is
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very much similar to Tegra30 I2C controller with some hardware
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modification:
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- Tegra30/Tegra20 I2C controller has 2 clock source called div-clk and
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fast-clk. Tegra114 has only one clock source called as div-clk and
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hence clock mechanism is changed in I2C controller.
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- Tegra30/Tegra20 I2C controller has enabled per packet transfer by
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default and there is no way to disable it. Tegra114 has this
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interrupt disable by default and SW need to enable explicitly.
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Due to above changes, Tegra114 I2C driver makes incompatible with
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previous hardware driver. Hence, tegra114 I2C controller is compatible
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with "nvidia,tegra114-i2c".
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- reg: Should contain I2C controller registers physical address and length.
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- interrupts: Should contain I2C controller interrupts.
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- address-cells: Address cells for I2C device address.
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- size-cells: Size of the I2C device address.
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- clocks: Must contain an entry for each entry in clock-names.
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See ../clocks/clock-bindings.txt for details.
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- clock-names: Must include the following entries:
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Tegra20/Tegra30:
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- div-clk
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- fast-clk
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Tegra114:
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- div-clk
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- resets: Must contain an entry for each entry in reset-names.
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See ../reset/reset.txt for details.
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- reset-names: Must include the following entries:
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- i2c
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- dmas: Must contain an entry for each entry in clock-names.
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See ../dma/dma.txt for details.
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- dma-names: Must include the following entries:
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- rx
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- tx
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Example:
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i2c@7000c000 {
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compatible = "nvidia,tegra20-i2c";
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reg = <0x7000c000 0x100>;
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interrupts = <0 38 0x04>;
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#address-cells = <1>;
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#size-cells = <0>;
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clocks = <&tegra_car 12>, <&tegra_car 124>;
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clock-names = "div-clk", "fast-clk";
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resets = <&tegra_car 12>;
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reset-names = "i2c";
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dmas = <&apbdma 16>, <&apbdma 16>;
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dma-names = "rx", "tx";
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status = "disabled";
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};
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