linux/Documentation/devicetree/bindings/timer/arm,arch_timer_mmio.yaml
Rob Herring 972d6a7dce dt-bindings: Drop redundant minItems/maxItems
If a property has an 'items' list, then a 'minItems' or 'maxItems' with the
same size as the list is redundant and can be dropped. Note that is DT
schema specific behavior and not standard json-schema behavior. The tooling
will fixup the final schema adding any unspecified minItems/maxItems.

This condition is partially checked with the meta-schema already, but
only if both 'minItems' and 'maxItems' are equal to the 'items' length.
An improved meta-schema is pending.

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Vivien Didelot <vivien.didelot@gmail.com>
Cc: Vladimir Oltean <olteanv@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for MMC
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20210615191543.1043414-1-robh@kernel.org
2021-06-21 13:56:46 -06:00

123 lines
3.1 KiB
YAML

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/timer/arm,arch_timer_mmio.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ARM memory mapped architected timer
maintainers:
- Marc Zyngier <marc.zyngier@arm.com>
- Mark Rutland <mark.rutland@arm.com>
description: |+
ARM cores may have a memory mapped architected timer, which provides up to 8
frames with a physical and optional virtual timer per frame.
The memory mapped timer is attached to a GIC to deliver its interrupts via SPIs.
properties:
compatible:
items:
- enum:
- arm,armv7-timer-mem
reg:
maxItems: 1
description: The control frame base address
'#address-cells':
enum: [1, 2]
'#size-cells':
const: 1
ranges: true
clock-frequency:
description: The frequency of the main counter, in Hz. Should be present
only where necessary to work around broken firmware which does not configure
CNTFRQ on all CPUs to a uniform correct value. Use of this property is
strongly discouraged; fix your firmware unless absolutely impossible.
always-on:
type: boolean
description: If present, the timer is powered through an always-on power
domain, therefore it never loses context.
arm,cpu-registers-not-fw-configured:
type: boolean
description: Firmware does not initialize any of the generic timer CPU
registers, which contain their architecturally-defined reset values. Only
supported for 32-bit systems which follow the ARMv7 architected reset
values.
arm,no-tick-in-suspend:
type: boolean
description: The main counter does not tick when the system is in
low-power system suspend on some SoCs. This behavior does not match the
Architecture Reference Manual's specification that the system counter "must
be implemented in an always-on power domain."
patternProperties:
'^frame@[0-9a-z]*$':
type: object
description: A timer node has up to 8 frame sub-nodes, each with the following properties.
properties:
frame-number:
$ref: "/schemas/types.yaml#/definitions/uint32"
minimum: 0
maximum: 7
interrupts:
minItems: 1
items:
- description: physical timer irq
- description: virtual timer irq
reg:
minItems: 1
items:
- description: 1st view base address
- description: 2nd optional view base address
required:
- frame-number
- interrupts
- reg
required:
- compatible
- reg
- '#address-cells'
- '#size-cells'
additionalProperties: false
examples:
- |
timer@f0000000 {
compatible = "arm,armv7-timer-mem";
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0xf0001000 0x1000>;
reg = <0xf0000000 0x1000>;
clock-frequency = <50000000>;
frame@0 {
frame-number = <0>;
interrupts = <0 13 0x8>,
<0 14 0x8>;
reg = <0x0000 0x1000>,
<0x1000 0x1000>;
};
frame@2000 {
frame-number = <1>;
interrupts = <0 15 0x8>;
reg = <0x2000 0x1000>;
};
};
...