Bindings/serial/mvebu-uart.txt

   1 * Marvell UART : Non standard UART used in some of Marvell EBU SoCs
   2                  e.g., Armada-3700.
   3
   4 Required properties:
   5 - compatible:
   6     - "marvell,armada-3700-uart" for the standard variant of the UART
   7       (32 bytes FIFO, no DMA, level interrupts, 8-bit access to the
   8       FIFO), called also UART1.
   9     - "marvell,armada-3700-uart-ext" for the extended variant of the
  10       UART (128 bytes FIFO, DMA, front interrupts, 8-bit or 32-bit
  11       accesses to the FIFO), called also UART2.
  12 - reg: offset and length of the register set for the device.
  13 - clocks: UART reference clock used to derive the baudrate. If no clock
  14       is provided (possible only with the "marvell,armada-3700-uart"
  15       compatible string for backward compatibility), it will only work
  16       if the baudrate was initialized by the bootloader and no baudrate
  17       change will then be possible. When provided it should be UART1-clk
  18       for standard variant of UART and UART2-clk for extended variant
  19       of UART. TBG clock (with UART TBG divisors d1=d2=1) or xtal clock
  20       should not be used and are supported only for backward compatibility.
  21 - interrupts:
  22     - Must contain three elements for the standard variant of the IP
  23       (marvell,armada-3700-uart): "uart-sum", "uart-tx" and "uart-rx",
  24       respectively the UART sum interrupt, the UART TX interrupt and
  25       UART RX interrupt. A corresponding interrupt-names property must
  26       be defined.
  27     - Must contain two elements for the extended variant of the IP
  28       (marvell,armada-3700-uart-ext): "uart-tx" and "uart-rx",
  29       respectively the UART TX interrupt and the UART RX interrupt. A
  30       corresponding interrupt-names property must be defined.
  31     - For backward compatibility reasons, a single element interrupts
  32       property is also supported for the standard variant of the IP,
  33       containing only the UART sum interrupt. This form is deprecated
  34       and should no longer be used.
  35
  36 Example:
  37         uart0: serial@12000 {
  38                 compatible = "marvell,armada-3700-uart";
  39                 reg = <0x12000 0x18>;
  40                 clocks = <&uartclk 0>;
  41                 interrupts =
  42                 <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
  43                 <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
  44                 <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
  45                 interrupt-names = "uart-sum", "uart-tx", "uart-rx";
  46         };
  47
  48         uart1: serial@12200 {
  49                 compatible = "marvell,armada-3700-uart-ext";
  50                 reg = <0x12200 0x30>;
  51                 clocks = <&uartclk 1>;
  52                 interrupts =
  53                 <GIC_SPI 30 IRQ_TYPE_EDGE_RISING>,
  54                 <GIC_SPI 31 IRQ_TYPE_EDGE_RISING>;
  55                 interrupt-names = "uart-tx", "uart-rx";
  56         };