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dt-bindings: reset: Convert ti,sci-reset to json schema

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Convert the ti,sci-reset to json schema for better checks and documentation.

Differences being:
 - Drop consumer example as they are documented in the corresponding
   bindings themselves.
 - Drop phandle description for reset consumer or cell definition as it is
   redundant.

Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20210426155457.21221-2-nm@ti.com
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Nishanth Menon 2021-04-26 10:54:54 -05:00 committed by Rob Herring
parent 6efb943b86
commit 9a81b8cbc2
2 changed files with 51 additions and 62 deletions
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62
Documentation/devicetree/bindings/reset/ti,sci-reset.txt
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Texas Instruments System Control Interface (TI-SCI) Reset Controller
=====================================================================
Some TI SoCs contain a system controller (like the Power Management Micro
Controller (PMMC) on Keystone 66AK2G SoC) that are responsible for controlling
the state of the various hardware modules present on the SoC. Communication
between the host processor running an OS and the system controller happens
through a protocol called TI System Control Interface (TI-SCI protocol).
For TI SCI details, please refer to the document,
Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
TI-SCI Reset Controller Node
============================
This reset controller node uses the TI SCI protocol to perform the reset
management of various hardware modules present on the SoC. Must be a child
node of the associated TI-SCI system controller node.
Required properties:
--------------------
- compatible : Should be "ti,sci-reset"
- #reset-cells : Should be 2. Please see the reset consumer node below for
usage details.
TI-SCI Reset Consumer Nodes
===========================
Each of the reset consumer nodes should have the following properties,
in addition to their own properties.
Required properties:
--------------------
- resets : A phandle and reset specifier pair, one pair for each reset
signal that affects the device, or that the device manages.
The phandle should point to the TI-SCI reset controller node,
and the reset specifier should have 2 cell-values. The first
cell should contain the device ID. The second cell should
contain the reset mask value used by system controller.
Please refer to the protocol documentation for these values
to be used for different devices,
http://processors.wiki.ti.com/index.php/TISCI#66AK2G02_Data
Please also refer to Documentation/devicetree/bindings/reset/reset.txt for
common reset controller usage by consumers.
Example:
--------
The following example demonstrates both a TI-SCI reset controller node and a
consumer (a DSP device) on the 66AK2G SoC.
pmmc: pmmc {
compatible = "ti,k2g-sci";
k2g_reset: reset-controller {
compatible = "ti,sci-reset";
#reset-cells = <2>;
};
};
dsp0: dsp@10800000 {
...
resets = <&k2g_reset 0x0046 0x1>;
...
};

51
Documentation/devicetree/bindings/reset/ti,sci-reset.yaml Normal file
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# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/reset/ti,sci-reset.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: TI-SCI reset controller node bindings
maintainers:
- Nishanth Menon <nm@ti.com>
description: |
Some TI SoCs contain a system controller (like the Power Management Micro
Controller (PMMC) on Keystone 66AK2G SoC) that are responsible for controlling
the state of the various hardware modules present on the SoC. Communication
between the host processor running an OS and the system controller happens
through a protocol called TI System Control Interface (TI-SCI protocol).
This reset controller node uses the TI SCI protocol to perform the reset
management of various hardware modules present on the SoC. Must be a child
node of the associated TI-SCI system controller node.
properties:
$nodename:
pattern: "^reset-controller$"
compatible:
const: ti,sci-reset
"#reset-cells":
const: 2
description:
The two cells represent values that the TI-SCI controller defines.
The first cell should contain the device ID.
The second cell should contain the reset mask corresponding to the device
used by system controller.
Please see http://processors.wiki.ti.com/index.php/TISCI for
protocol documentation for the values to be used for different devices.
additionalProperties: false
examples:
- |
k3_reset: reset-controller {
compatible = "ti,sci-reset";
#reset-cells = <2>;
};