f985b0b6e1
On most of the Amlogic SoCs, the first UART controller in the "Everything-Else" power domain has 128bytes of RX & TX FIFO, so add an optional property to describe a different FIFO size from the other ports (64bytes). Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Link: https://lore.kernel.org/r/20210518075833.3736038-2-narmstrong@baylibre.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
81 lines
2.1 KiB
YAML
81 lines
2.1 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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# Copyright 2019 BayLibre, SAS
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%YAML 1.2
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---
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$id: "http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#"
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$schema: "http://devicetree.org/meta-schemas/core.yaml#"
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title: Amlogic Meson SoC UART Serial Interface
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maintainers:
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- Neil Armstrong <narmstrong@baylibre.com>
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description: |
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The Amlogic Meson SoC UART Serial Interface is present on a large range
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of SoCs, and can be present either in the "Always-On" power domain or the
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"Everything-Else" power domain.
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The particularity of the "Always-On" Serial Interface is that the hardware
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is active since power-on and does not need any clock gating and is usable
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as very early serial console.
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properties:
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compatible:
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oneOf:
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- description: Always-on power domain UART controller
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items:
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- enum:
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- amlogic,meson6-uart
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- amlogic,meson8-uart
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- amlogic,meson8b-uart
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- amlogic,meson-gx-uart
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- const: amlogic,meson-ao-uart
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- description: Everything-Else power domain UART controller
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enum:
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- amlogic,meson6-uart
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- amlogic,meson8-uart
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- amlogic,meson8b-uart
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- amlogic,meson-gx-uart
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reg:
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maxItems: 1
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interrupts:
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maxItems: 1
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clocks:
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items:
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- description: external xtal clock identifier
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- description: the bus core clock, either the clk81 clock or the gate clock
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- description: the source of the baudrate generator, can be either the xtal or the pclk
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clock-names:
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items:
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- const: xtal
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- const: pclk
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- const: baud
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fifo-size:
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description: The fifo size supported by the UART channel.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [64, 128]
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required:
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- compatible
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- reg
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- interrupts
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- clocks
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- clock-names
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additionalProperties: false
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examples:
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- |
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serial@84c0 {
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compatible = "amlogic,meson-gx-uart";
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reg = <0x84c0 0x14>;
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interrupts = <26>;
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clocks = <&xtal>, <&pclk>, <&xtal>;
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clock-names = "xtal", "pclk", "baud";
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};
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