dt-bindings: timer: Add Broadcom's BCMBCA timers

BCA is a big set / family of Broadcom devices sharing multiple hardware
blocks. One of them is timer that actually exists in two versions. It's
a part of TWD MFD block.

Add binding for it so SoCs can be properly described. Linux (and
probably any other OS) doesn't really seem to need a driver for it. it
may be needed for bootloaders (e.g. U-Boot) though. Especially for SoCs
with CPUs other than Cortex-A9 (which contains arch timers).

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221028115353.13881-1-zajec5@gmail.com
This commit is contained in:
Rafał Miłecki 2022-10-28 13:53:53 +02:00 committed by Lee Jones
parent 727b67e349
commit e112f2de15
2 changed files with 48 additions and 0 deletions
Documentation/devicetree/bindings

@ -36,6 +36,9 @@ properties:
const: 1
patternProperties:
'^timer@[a-f0-9]+$':
$ref: /schemas/timer/brcm,bcmbca-timer.yaml
'^watchdog@[a-f0-9]+$':
$ref: /schemas/watchdog/brcm,bcm7038-wdt.yaml
@ -54,6 +57,11 @@ examples:
#address-cells = <1>;
#size-cells = <1>;
timer@0 {
compatible = "brcm,bcm63138-timer";
reg = <0x0 0x28>;
};
watchdog@28 {
compatible = "brcm,bcm7038-wdt";
reg = <0x28 0x8>;

@ -0,0 +1,40 @@
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/timer/brcm,bcmbca-timer.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Broadcom Broadband SoC timer
maintainers:
- Rafał Miłecki <rafal@milecki.pl>
properties:
compatible:
oneOf:
- const: brcm,bcm6345-timer
description: >
An old block with 3 timers.
It can be found in BCM6345, BCM6838 and BCM63268.
- const: brcm,bcm63138-timer
description: >
Updated block with 4 timers and control regs at the beginning.
It can be found in newer SoCs, e.g. BCM63138, BCM63148, BCM63381,
BCM68360, BCM6848, BCM6858, BCM4908.
reg:
maxItems: 1
additionalProperties: false
required:
- reg
examples:
- |
timer@fffe0200 {
compatible = "brcm,bcm6345-timer";
reg = <0xfffe0200 0x1c>;
};