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Message-ID: <20210426155457.21221-4-nm@ti.com>
Date: Mon, 26 Apr 2021 10:54:56 -0500
From: Nishanth Menon <nm@...com>
To: Rob Herring <robh@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
Tero Kristo <kristo@...nel.org>
CC: Philipp Zabel <p.zabel@...gutronix.de>,
Michael Turquette <mturquette@...libre.com>,
Santosh Shilimkar <ssantosh@...nel.org>,
<linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, Nishanth Menon <nm@...com>
Subject: [PATCH V2 3/4] dt-bindings: soc: ti: Convert ti,sci-pm-domain to json schema
Convert the ti,sci-pm-domain 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@...com>
Reviewed-by: Rob Herring <robh@...nel.org>
Reviewed-by: Tero Kristo <kristo@...nel.org>
---
Changes since V1:
* reviewed by from Tero and Rob
https://lore.kernel.org/linux-arm-kernel/20210421223627.GA1740013@robh.at.kernel.org/
https://lore.kernel.org/linux-arm-kernel/56388707-c8d3-ebdf-77a2-c5a983856b4d@kernel.org/
* Updated commit message to drop the 'checkpatch warning'
v1: https://lore.kernel.org/linux-arm-kernel/20210416063721.20538-4-nm@ti.com/
.../bindings/soc/ti/sci-pm-domain.txt | 65 -------------------
.../bindings/soc/ti/sci-pm-domain.yaml | 59 +++++++++++++++++
2 files changed, 59 insertions(+), 65 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
create mode 100644 Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml
diff --git a/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt b/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
deleted file mode 100644
index 6217e64309de..000000000000
--- a/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
+++ /dev/null
@@ -1,65 +0,0 @@
-Texas Instruments TI-SCI Generic Power Domain
----------------------------------------------
-
-Some TI SoCs contain a system controller (like the PMMC, etc...) that is
-responsible for controlling the state of the IPs that are present.
-Communication between the host processor running an OS and the system
-controller happens through a protocol known as TI-SCI [1].
-
-[1] Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
-
-PM Domain Node
-==============
-The PM domain node represents the global PM domain managed by the PMMC, which
-in this case is the implementation as documented by the generic PM domain
-bindings in Documentation/devicetree/bindings/power/power-domain.yaml. Because
-this relies on the TI SCI protocol to communicate with the PMMC it must be a
-child of the pmmc node.
-
-Required Properties:
---------------------
-- compatible: should be "ti,sci-pm-domain"
-- #power-domain-cells: Can be one of the following:
- 1: Containing the device id of each node
- 2: First entry should be device id
- Second entry should be one of the floowing:
- TI_SCI_PD_EXCLUSIVE: To allow device to be
- exclusively controlled by
- the requesting hosts.
- TI_SCI_PD_SHARED: To allow device to be shared
- by multiple hosts.
-
-Example (K2G):
--------------
- pmmc: pmmc {
- compatible = "ti,k2g-sci";
- ...
-
- k2g_pds: power-controller {
- compatible = "ti,sci-pm-domain";
- #power-domain-cells = <1>;
- };
- };
-
-PM Domain Consumers
-===================
-Hardware blocks belonging to a PM domain should contain a "power-domains"
-property that is a phandle pointing to the corresponding PM domain node
-along with an index representing the device id to be passed to the PMMC
-for device control.
-
-Required Properties:
---------------------
-- power-domains: phandle pointing to the corresponding PM domain node
- and an ID representing the device.
-
-See http://processors.wiki.ti.com/index.php/TISCI#66AK2G02_Data for the list
-of valid identifiers for k2g.
-
-Example (K2G):
---------------------
- uart0: serial@...0c00 {
- compatible = "ns16550a";
- ...
- power-domains = <&k2g_pds 0x002c>;
- };
diff --git a/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml b/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml
new file mode 100644
index 000000000000..9e6cb4ee9755
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/ti/sci-pm-domain.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI-SCI generic power domain node bindings
+
+maintainers:
+ - Nishanth Menon <nm@...com>
+
+allOf:
+ - $ref: /schemas/power/power-domain.yaml#
+
+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 PM domain node represents the global PM domain managed by the TI-SCI
+ controller. Since this relies on the TI SCI protocol to communicate with
+ the TI-SCI controller, it must be a child of the TI-SCI controller node.
+
+properties:
+ compatible:
+ const: ti,sci-pm-domain
+
+ "#power-domain-cells":
+ enum: [1, 2]
+ description:
+ The two cells represent values that the TI-SCI controller defines.
+
+ The first cell should contain the device ID.
+
+ The second cell, if cell-value is 2, should be one of the following
+ TI_SCI_PD_EXCLUSIVE - Allows the device to be exclusively controlled
+ or
+ TI_SCI_PD_SHARED - Allows the device to be shared by multiple hosts.
+ Please refer to dt-bindings/soc/ti,sci_pm_domain.h for the definitions.
+
+ 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:
+ - |
+ k2g_pds: power-controller {
+ compatible = "ti,sci-pm-domain";
+ #power-domain-cells = <1>;
+ };
+
+ - |
+ k3_pds: power-controller {
+ compatible = "ti,sci-pm-domain";
+ #power-domain-cells = <2>;
+ };
--
2.31.0
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