* Marvell UART : Non standard UART used in some of Marvell EBU SoCs e.g., Armada-3700. Required properties: - compatible: - "marvell,armada-3700-uart" for the standard variant of the UART (32 bytes FIFO, no DMA, level interrupts, 8-bit access to the FIFO), called also UART1. - "marvell,armada-3700-uart-ext" for the extended variant of the UART (128 bytes FIFO, DMA, front interrupts, 8-bit or 32-bit accesses to the FIFO), called also UART2. - reg: offset and length of the register set for the device. - clocks: UART reference clock used to derive the baudrate. If no clock is provided (possible only with the "marvell,armada-3700-uart" compatible string for backward compatibility), it will only work if the baudrate was initialized by the bootloader and no baudrate change will then be possible. When provided it should be UART1-clk for standard variant of UART and UART2-clk for extended variant of UART. TBG clock (with UART TBG divisors d1=d2=1) or xtal clock should not be used and are supported only for backward compatibility. - interrupts: - Must contain three elements for the standard variant of the IP (marvell,armada-3700-uart): "uart-sum", "uart-tx" and "uart-rx", respectively the UART sum interrupt, the UART TX interrupt and UART RX interrupt. A corresponding interrupt-names property must be defined. - Must contain two elements for the extended variant of the IP (marvell,armada-3700-uart-ext): "uart-tx" and "uart-rx", respectively the UART TX interrupt and the UART RX interrupt. A corresponding interrupt-names property must be defined. - For backward compatibility reasons, a single element interrupts property is also supported for the standard variant of the IP, containing only the UART sum interrupt. This form is deprecated and should no longer be used. Example: uart0: serial@12000 { compatible = "marvell,armada-3700-uart"; reg = <0x12000 0x18>; clocks = <&uartclk 0>; interrupts = , , ; interrupt-names = "uart-sum", "uart-tx", "uart-rx"; }; uart1: serial@12200 { compatible = "marvell,armada-3700-uart-ext"; reg = <0x12200 0x30>; clocks = <&uartclk 1>; interrupts = , ; interrupt-names = "uart-tx", "uart-rx"; };