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Document i2c Device Tree support for RZ/G1[ME] (also known as r8aA774[35]) SoCs. They are compatible with R-Car Gen2 SoC family. Signed-off-by: Biju Das <biju.das@bp.renesas.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
53 lines
2.0 KiB
Plaintext
53 lines
2.0 KiB
Plaintext
I2C for R-Car platforms
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Required properties:
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- compatible:
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"renesas,i2c-r8a7743" if the device is a part of a R8A7743 SoC.
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"renesas,i2c-r8a7745" if the device is a part of a R8A7745 SoC.
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"renesas,i2c-r8a7778" if the device is a part of a R8A7778 SoC.
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"renesas,i2c-r8a7779" if the device is a part of a R8A7779 SoC.
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"renesas,i2c-r8a7790" if the device is a part of a R8A7790 SoC.
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"renesas,i2c-r8a7791" if the device is a part of a R8A7791 SoC.
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"renesas,i2c-r8a7792" if the device is a part of a R8A7792 SoC.
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"renesas,i2c-r8a7793" if the device is a part of a R8A7793 SoC.
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"renesas,i2c-r8a7794" if the device is a part of a R8A7794 SoC.
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"renesas,i2c-r8a7795" if the device is a part of a R8A7795 SoC.
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"renesas,i2c-r8a7796" if the device is a part of a R8A7796 SoC.
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"renesas,rcar-gen1-i2c" for a generic R-Car Gen1 compatible device.
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"renesas,rcar-gen2-i2c" for a generic R-Car Gen2 or RZ/G1 compatible
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device.
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"renesas,rcar-gen3-i2c" for a generic R-Car Gen3 compatible device.
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"renesas,i2c-rcar" (deprecated)
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When compatible with the generic version, nodes must list the
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SoC-specific version corresponding to the platform first followed
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by the generic version.
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- reg: physical base address of the controller and length of memory mapped
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region.
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- interrupts: interrupt specifier.
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Optional properties:
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- clock-frequency: desired I2C bus clock frequency in Hz. The absence of this
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property indicates the default frequency 100 kHz.
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- clocks: clock specifier.
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- dmas: Must contain a list of two references to DMA specifiers, one for
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transmission, and one for reception.
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- dma-names: Must contain a list of two DMA names, "tx" and "rx".
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- i2c-scl-falling-time-ns: see i2c.txt
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- i2c-scl-internal-delay-ns: see i2c.txt
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- i2c-scl-rising-time-ns: see i2c.txt
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Examples :
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i2c0: i2c@e6508000 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "renesas,i2c-r8a7791", "renesas,rcar-gen2-i2c";
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reg = <0 0xe6508000 0 0x40>;
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interrupts = <0 287 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&mstp9_clks R8A7791_CLK_I2C0>;
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clock-frequency = <400000>;
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};
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