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Diffstat (limited to 'Documentation/devicetree/bindings/serial/mvebu-uart.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/serial/mvebu-uart.txt | 50 |
1 files changed, 45 insertions, 5 deletions
diff --git a/Documentation/devicetree/bindings/serial/mvebu-uart.txt b/Documentation/devicetree/bindings/serial/mvebu-uart.txt index d37fabe17bd1..2ae2fee7e023 100644 --- a/Documentation/devicetree/bindings/serial/mvebu-uart.txt +++ b/Documentation/devicetree/bindings/serial/mvebu-uart.txt @@ -1,13 +1,53 @@ -* Marvell UART : Non standard UART used in some of Marvell EBU SoCs (e.g., Armada-3700) +* Marvell UART : Non standard UART used in some of Marvell EBU SoCs + e.g., Armada-3700. Required properties: -- compatible: "marvell,armada-3700-uart" +- 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, baudrate limited to 230400). + - "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, baudrate unlimited by the dividers). - reg: offset and length of the register set for the device. -- interrupts: device interrupt +- 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. +- 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 interrupts-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: - serial@12000 { + uart0: serial@12000 { compatible = "marvell,armada-3700-uart"; reg = <0x12000 0x200>; - interrupts = <43>; + clocks = <&xtalclk>; + interrupts = + <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>; + interrupt-names = "uart-sum", "uart-tx", "uart-rx"; + }; + + uart1: serial@12200 { + compatible = "marvell,armada-3700-uart-ext"; + reg = <0x12200 0x30>; + clocks = <&xtalclk>; + interrupts = + <GIC_SPI 30 IRQ_TYPE_EDGE_RISING>, + <GIC_SPI 31 IRQ_TYPE_EDGE_RISING>; + interrupt-names = "uart-tx", "uart-rx"; }; |