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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt
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@@ -23,6 +23,18 @@
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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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+
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 Example:
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 spi@7000d600 {
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@@ -38,4 +50,12 @@
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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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 };