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author | Sagar Kadam <sagar.kadam@sifive.com> | 2020-09-29 18:32:11 +0300 |
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committer | Rob Herring <robh@kernel.org> | 2020-10-06 21:44:42 +0300 |
commit | 6b49329ae68caeefbd0d69ff85475cd54a4b0d03 (patch) | |
tree | 9d1a62bab4a39a09b659fd52bd0b2119f9d64854 /Documentation/devicetree/bindings/pwm/pwm-sifive.yaml | |
parent | c825a081c169cc7f2b956a4b29c878662834e672 (diff) | |
download | linux-6b49329ae68caeefbd0d69ff85475cd54a4b0d03.tar.xz |
dt-bindings: riscv: convert pwm bindings to json-schema
Convert device tree bindings for SiFive's PWM controller to YAML
format.
Signed-off-by: Sagar Kadam <sagar.kadam@sifive.com>
Link: https://lore.kernel.org/r/1601393531-2402-4-git-send-email-sagar.kadam@sifive.com
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/pwm/pwm-sifive.yaml')
-rw-r--r-- | Documentation/devicetree/bindings/pwm/pwm-sifive.yaml | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pwm/pwm-sifive.yaml b/Documentation/devicetree/bindings/pwm/pwm-sifive.yaml new file mode 100644 index 000000000000..5ac25275d8bf --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.yaml @@ -0,0 +1,69 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2020 SiFive, Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/pwm-sifive.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: SiFive PWM controller + +maintainers: + - Yash Shah <yash.shah@sifive.com> + - Sagar Kadam <sagar.kadam@sifive.com> + - Paul Walmsley <paul.walmsley@sifive.com> + +description: + Unlike most other PWM controllers, the SiFive PWM controller currently + only supports one period for all channels in the PWM. All PWMs need to + run at the same period. The period also has significant restrictions on + the values it can achieve, which the driver rounds to the nearest + achievable period. PWM RTL that corresponds to the IP block version + numbers can be found here - + + https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm + +properties: + compatible: + items: + - const: sifive,fu540-c000-pwm + - const: sifive,pwm0 + description: + Should be "sifive,<chip>-pwm" and "sifive,pwm<version>". Supported + compatible strings are "sifive,fu540-c000-pwm" for the SiFive PWM v0 + as integrated onto the SiFive FU540 chip, and "sifive,pwm0" for the + SiFive PWM v0 IP block with no chip integration tweaks. + Please refer to sifive-blocks-ip-versioning.txt for details. + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + "#pwm-cells": + const: 3 + + interrupts: + maxItems: 4 + description: + Each PWM instance in FU540-C000 has 4 comparators. One interrupt per comparator. + +required: + - compatible + - reg + - clocks + - "#pwm-cells" + - interrupts + +additionalProperties: false + +examples: + - | + pwm: pwm@10020000 { + compatible = "sifive,fu540-c000-pwm", "sifive,pwm0"; + reg = <0x10020000 0x1000>; + clocks = <&tlclk>; + interrupt-parent = <&plic>; + interrupts = <42>, <43>, <44>, <45>; + #pwm-cells = <3>; + }; |