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NVIDIA Tegra114 SPI controller.
Required properties:
- compatible : should be "nvidia,tegra114-spi".
- reg: Should contain SPI registers location and length.
- interrupts: Should contain SPI interrupts.
- nvidia,dma-request-selector : The Tegra DMA controller's phandle and
request selector for this SPI controller.
Recommended properties:
- spi-max-frequency: Definition as per
Documentation/devicetree/bindings/spi/spi-bus.txt
Optional properties:
- nvidia,clock-always-on: Enable clock of spi always.
spi-client device controller properties:
- nvidia,enable-hw-based-cs: (Boolean) Use the HW based CS if enabled.
- nvidia,tx-clk-tap-delay: Delays the clock going out to the external device
with this tap value.
- nvidia,rx-clk-tap-delay: Delays the clock coming in from the external device
with this tap value.
- nvidia,cs-setup-clk-count: CS setup timing parameter.
- nvidia,cs-hold-clk-count: CS hold timing parameter.
Example:
spi@7000d600 {
compatible = "nvidia,tegra114-spi";
reg = <0x7000d600 0x200>;
interrupts = <0 82 0x04>;
nvidia,dma-request-selector = <&apbdma 16>;
spi-max-frequency = <25000000>;
nvidia,clock-always-on;
#address-cells = <1>;
#size-cells = <0>;
status = "disabled";
<spi-client>@<bus_num> {
...
...
nvidia,enable-hw-based-cs;
nvidia,cs-setup-clk-count = <10>;
nvidia,cs-hold-clk-count = <10>;
nvidia,rx-clk-tap-delay = <0>;
nvidia,tx-clk-tap-delay = <16>;
...
};
};
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