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-NVIDIA Tegra20/Tegra30 high speed (DMA based) UART controller driver.
-
-Required properties:
-- compatible : should be,
-  "nvidia,tegra20-hsuart" for Tegra20,
-  "nvidia,tegra30-hsuart" for Tegra30,
-  "nvidia,tegra186-hsuart" for Tegra186,
-  "nvidia,tegra194-hsuart" for Tegra194.
-
-- reg: Should contain UART controller registers location and length.
-- interrupts: Should contain UART controller interrupts.
-- clocks: Must contain one entry, for the module clock.
-  See ../clocks/clock-bindings.txt for details.
-- resets : Must contain an entry for each entry in reset-names.
-  See ../reset/reset.txt for details.
-- reset-names : Must include the following entries:
-  - serial
-- dmas : Must contain an entry for each entry in dma-names.
-  See ../dma/dma.txt for details.
-- dma-names : Must include the following entries:
-  - rx
-  - tx
-
-Optional properties:
-- nvidia,enable-modem-interrupt: Enable modem interrupts. Should be enable
-		only if all 8 lines of UART controller are pinmuxed.
-- nvidia,adjust-baud-rates: List of entries providing percentage of baud rate
-  adjustment within a range.
-  Each entry contains sets of 3 values. Range low/high and adjusted rate.
-  <range_low range_high adjusted_rate>
-  When baud rate set on controller falls within the range mentioned in this
-  field, baud rate will be adjusted by percentage mentioned here.
-  Ex: <9600 115200 200>
-  Increase baud rate by 2% when set baud rate falls within range 9600 to 115200
-
-Baud Rate tolerance:
-  Standard UART devices are expected to have tolerance for baud rate error by
-  -4 to +4 %. All Tegra devices till Tegra210 had this support. However,
-  Tegra186 chip has a known hardware issue. UART Rx baud rate tolerance level
-  is 0% to +4% in 1-stop config. Otherwise, the received data will have
-  corruption/invalid framing errors. Parker errata suggests adjusting baud
-  rate to be higher than the deviations observed in Tx.
-
-  Tx deviation of connected device can be captured over scope (or noted from
-  its spec) for valid range and Tegra baud rate has to be set above actual
-  Tx baud rate observed. To do this we use nvidia,adjust-baud-rates
-
-  As an example, consider there is deviation observed in Tx for baud rates as
-  listed below.
-  0 to 9600 has 1% deviation
-  9600 to 115200 2% deviation
-  This slight deviation is expcted and Tegra UART is expected to handle it. Due
-  to the issue stated above, baud rate on Tegra UART should be set equal to or
-  above deviation observed for avoiding frame errors.
-  Property should be set like this
-  nvidia,adjust-baud-rates = <0 9600 100>,
-  			     <9600 115200 200>;
-
-Example:
-
-serial@70006000 {
-	compatible = "nvidia,tegra30-hsuart", "nvidia,tegra20-hsuart";
-	reg = <0x70006000 0x40>;
-	reg-shift = <2>;
-	interrupts = <0 36 0x04>;
-	nvidia,enable-modem-interrupt;
-	clocks = <&tegra_car 6>;
-	resets = <&tegra_car 6>;
-	reset-names = "serial";
-	dmas = <&apbdma 8>, <&apbdma 8>;
-	dma-names = "rx", "tx";
-	nvidia,adjust-baud-rates = <1000000 4000000 136>; /* 1.36% shift */
-};