57 lines
2.5 KiB
Plaintext
57 lines
2.5 KiB
Plaintext
* Marvell UART : Non standard UART used in some of Marvell EBU SoCs
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e.g., Armada-3700.
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Required properties:
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- compatible:
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- "marvell,armada-3700-uart" for the standard variant of the UART
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(32 bytes FIFO, no DMA, level interrupts, 8-bit access to the
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FIFO), called also UART1.
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- "marvell,armada-3700-uart-ext" for the extended variant of the
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UART (128 bytes FIFO, DMA, front interrupts, 8-bit or 32-bit
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accesses to the FIFO), called also UART2.
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- reg: offset and length of the register set for the device.
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- clocks: UART reference clock used to derive the baudrate. If no clock
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is provided (possible only with the "marvell,armada-3700-uart"
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compatible string for backward compatibility), it will only work
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if the baudrate was initialized by the bootloader and no baudrate
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change will then be possible. When provided it should be UART1-clk
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for standard variant of UART and UART2-clk for extended variant
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of UART. TBG clock (with UART TBG divisors d1=d2=1) or xtal clock
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should not be used and are supported only for backward compatibility.
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- interrupts:
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- Must contain three elements for the standard variant of the IP
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(marvell,armada-3700-uart): "uart-sum", "uart-tx" and "uart-rx",
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respectively the UART sum interrupt, the UART TX interrupt and
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UART RX interrupt. A corresponding interrupt-names property must
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be defined.
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- Must contain two elements for the extended variant of the IP
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(marvell,armada-3700-uart-ext): "uart-tx" and "uart-rx",
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respectively the UART TX interrupt and the UART RX interrupt. A
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corresponding interrupt-names property must be defined.
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- For backward compatibility reasons, a single element interrupts
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property is also supported for the standard variant of the IP,
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containing only the UART sum interrupt. This form is deprecated
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and should no longer be used.
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Example:
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uart0: serial@12000 {
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compatible = "marvell,armada-3700-uart";
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reg = <0x12000 0x18>;
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clocks = <&uartclk 0>;
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interrupts =
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<GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
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interrupt-names = "uart-sum", "uart-tx", "uart-rx";
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};
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uart1: serial@12200 {
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compatible = "marvell,armada-3700-uart-ext";
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reg = <0x12200 0x30>;
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clocks = <&uartclk 1>;
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interrupts =
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<GIC_SPI 30 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 31 IRQ_TYPE_EDGE_RISING>;
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interrupt-names = "uart-tx", "uart-rx";
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};
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