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61 lines
2.1 KiB
61 lines
2.1 KiB
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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