56b3276954
Both UARTs support higher baudrates and are not limited to baudrate 230400.
Only current kernel driver implementation has limitation for both UARTs in
maximal baudrate 230400. This limitation will be removed in next patches.
So remove incorrect information about (hardware) limitation from bindings.
UART1 (standard variant with DT node name 'uart0') has register space
0x12000-0x12018 and not whole size 0x200. So fix also this in example.
Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: d160c3413478 ("dt-bindings: mvebu-uart: update documentation with extended UART")
Link: https://lore.kernel.org/r/20210624224909.6350-5-pali@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
54 lines
2.2 KiB
Plaintext
54 lines
2.2 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.
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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 = <&xtalclk>;
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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 = <&xtalclk>;
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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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