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72 lines
2.0 KiB
72 lines
2.0 KiB
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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# Copyright (C) 2020 SiFive, Inc. |
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%YAML 1.2 |
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--- |
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$id: http://devicetree.org/schemas/pwm/pwm-sifive.yaml# |
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$schema: http://devicetree.org/meta-schemas/core.yaml# |
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title: SiFive PWM controller |
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maintainers: |
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- Yash Shah <[email protected]> |
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- Sagar Kadam <[email protected]> |
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- Paul Walmsley <[email protected]> |
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description: |
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Unlike most other PWM controllers, the SiFive PWM controller currently |
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only supports one period for all channels in the PWM. All PWMs need to |
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run at the same period. The period also has significant restrictions on |
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the values it can achieve, which the driver rounds to the nearest |
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achievable period. PWM RTL that corresponds to the IP block version |
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numbers can be found here - |
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https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm |
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properties: |
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compatible: |
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items: |
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- enum: |
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- sifive,fu540-c000-pwm |
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- sifive,fu740-c000-pwm |
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- const: sifive,pwm0 |
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description: |
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Should be "sifive,<chip>-pwm" and "sifive,pwm<version>". Supported |
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compatible strings are "sifive,fu540-c000-pwm" and |
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"sifive,fu740-c000-pwm" for the SiFive PWM v0 as integrated onto the |
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SiFive FU540 and FU740 chip respectively, and "sifive,pwm0" for the |
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SiFive PWM v0 IP block with no chip integration tweaks. |
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Please refer to sifive-blocks-ip-versioning.txt for details. |
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reg: |
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maxItems: 1 |
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clocks: |
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maxItems: 1 |
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"#pwm-cells": |
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const: 3 |
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interrupts: |
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maxItems: 4 |
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description: |
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Each PWM instance in FU540-C000 has 4 comparators. One interrupt per comparator. |
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required: |
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- compatible |
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- reg |
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- clocks |
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- "#pwm-cells" |
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- interrupts |
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additionalProperties: false |
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examples: |
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- | |
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pwm: pwm@10020000 { |
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compatible = "sifive,fu540-c000-pwm", "sifive,pwm0"; |
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reg = <0x10020000 0x1000>; |
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clocks = <&tlclk>; |
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interrupt-parent = <&plic>; |
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interrupts = <42>, <43>, <44>, <45>; |
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#pwm-cells = <3>; |
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};
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