62 lines
2.1 KiB
Plaintext
62 lines
2.1 KiB
Plaintext
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NVIDIA Tegra114 SPI controller.
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Required properties:
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- compatible : For Tegra114, must contain "nvidia,tegra114-spi".
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Otherwise, must contain '"nvidia,<chip>-spi", "nvidia,tegra114-spi"' where
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<chip> is tegra124, tegra132, or tegra210.
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- reg: Should contain SPI registers location and length.
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- interrupts: Should contain SPI interrupts.
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- clock-names : Must include the following entries:
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- spi
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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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- spi
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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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- 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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Recommended properties:
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- spi-max-frequency: Definition as per
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Documentation/devicetree/bindings/spi/spi-bus.txt
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Optional properties:
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- nvidia,tx-clk-tap-delay: Delays the clock going out to the external device
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with this tap value. This property is used to tune the outgoing data from
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Tegra SPI master with respect to outgoing Tegra SPI master clock.
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Tap values vary based on the platform design trace lengths from Tegra SPI
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to corresponding slave devices. Valid tap values are from 0 thru 63.
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- nvidia,rx-clk-tap-delay: Delays the clock coming in from the external device
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with this tap value. This property is used to adjust the Tegra SPI master
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clock with respect to the data from the SPI slave device.
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Tap values vary based on the platform design trace lengths from Tegra SPI
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to corresponding slave devices. Valid tap values are from 0 thru 63.
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Example:
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spi@7000d600 {
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compatible = "nvidia,tegra114-spi";
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reg = <0x7000d600 0x200>;
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interrupts = <0 82 0x04>;
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spi-max-frequency = <25000000>;
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#address-cells = <1>;
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#size-cells = <0>;
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clocks = <&tegra_car 44>;
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clock-names = "spi";
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resets = <&tegra_car 44>;
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reset-names = "spi";
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dmas = <&apbdma 16>, <&apbdma 16>;
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dma-names = "rx", "tx";
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<spi-client>@<bus_num> {
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...
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...
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nvidia,rx-clk-tap-delay = <0>;
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nvidia,tx-clk-tap-delay = <16>;
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...
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};
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};
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