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Message-ID: <20240105130404.301172-2-gatien.chevallier@foss.st.com>
Date: Fri, 5 Jan 2024 14:03:52 +0100
From: Gatien Chevallier <gatien.chevallier@...s.st.com>
To: <Oleksii_Moisieiev@...m.com>, <gregkh@...uxfoundation.org>,
        <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <alexandre.torgue@...s.st.com>,
        <vkoul@...nel.org>, <jic23@...nel.org>, <olivier.moysan@...s.st.com>,
        <arnaud.pouliquen@...s.st.com>, <mchehab@...nel.org>,
        <fabrice.gasnier@...s.st.com>, <andi.shyti@...nel.org>,
        <ulf.hansson@...aro.org>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <hugues.fruchet@...s.st.com>, <lee@...nel.org>,
        <will@...nel.org>, <catalin.marinas@....com>, <arnd@...nel.org>,
        <richardcochran@...il.com>, Frank Rowand <frowand.list@...il.com>,
        <peng.fan@....nxp.com>, <lars@...afoo.de>, <rcsekar@...sung.com>,
        <wg@...ndegger.com>, <mkl@...gutronix.de>
CC: <linux-crypto@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <dmaengine@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
        <linux-iio@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <linux-media@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
        <linux-serial@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <linux-usb@...r.kernel.org>,
        Oleksii Moisieiev <oleksii_moisieiev@...m.com>,
        Gatien Chevallier <gatien.chevallier@...s.st.com>,
        Rob Herring
	<robh@...nel.org>
Subject: [PATCH v9 01/13] dt-bindings: document generic access controllers

From: Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>

Introducing of the generic access controllers bindings for the
access controller provider and consumer devices. Those bindings are
intended to allow a better handling of accesses to resources in a
hardware architecture supporting several compartments.

This patch is based on [1]. It is integrated in this patchset as it
provides a use-case for it.

Diffs with [1]:
	- Rename feature-domain* properties to access-control* to narrow
	  down the scope of the binding
	- YAML errors and typos corrected.
	- Example updated
	- Some rephrasing in the binding description

[1]: https://lore.kernel.org/lkml/0c0a82bb-18ae-d057-562b

Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---

Changes in V9:
	- Added Rob's review tag

Changes in V6:
	- Renamed access-controller to access-controllers
	- Example updated
	- Removal of access-control-provider property

Changes in V5:
	- Diffs with [1]
	- Discarded the [IGNORE] tag as the patch is now part of the
	  patchset

 .../access-controllers.yaml                   | 84 +++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/access-controllers/access-controllers.yaml

diff --git a/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml b/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml
new file mode 100644
index 000000000000..99e2865f0e46
--- /dev/null
+++ b/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/access-controllers/access-controllers.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic Domain Access Controllers
+
+maintainers:
+  - Oleksii Moisieiev <oleksii_moisieiev@...m.com>
+
+description: |+
+  Common access controllers properties
+
+  Access controllers are in charge of stating which of the hardware blocks under
+  their responsibility (their domain) can be accesssed by which compartment. A
+  compartment can be a cluster of CPUs (or coprocessors), a range of addresses
+  or a group of hardware blocks. An access controller's domain is the set of
+  resources covered by the access controller.
+
+  This device tree binding can be used to bind devices to their access
+  controller provided by access-controllers property. In this case, the device
+  is a consumer and the access controller is the provider.
+
+  An access controller can be represented by any node in the device tree and
+  can provide one or more configuration parameters, needed to control parameters
+  of the consumer device. A consumer node can refer to the provider by phandle
+  and a set of phandle arguments, specified by '#access-controller-cells'
+  property in the access controller node.
+
+  Access controllers are typically used to set/read the permissions of a
+  hardware block and grant access to it. Any of which depends on the access
+  controller. The capabilities of each access controller are defined by the
+  binding of the access controller device.
+
+  Each node can be a consumer for the several access controllers.
+
+# always select the core schema
+select: true
+
+properties:
+  "#access-controller-cells":
+    description:
+      Number of cells in an access-controllers specifier;
+      Can be any value as specified by device tree binding documentation
+      of a particular provider. The node is an access controller.
+
+  access-controller-names:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description:
+      A list of access-controllers names, sorted in the same order as
+      access-controllers entries. Consumer drivers will use
+      access-controller-names to match with existing access-controllers entries.
+
+  access-controllers:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      A list of access controller specifiers, as defined by the
+      bindings of the access-controllers provider.
+
+additionalProperties: true
+
+examples:
+  - |
+    clock_controller: access-controllers@...00 {
+        reg = <0x50000 0x400>;
+        #access-controller-cells = <2>;
+    };
+
+    bus_controller: bus@...00 {
+        reg = <0x60000 0x10000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+        #access-controller-cells = <3>;
+
+        uart4: serial@...00 {
+            reg = <0x60100 0x400>;
+            clocks = <&clk_serial>;
+            access-controllers = <&clock_controller 1 2>,
+                                 <&bus_controller 1 3 5>;
+            access-controller-names = "clock", "bus";
+        };
+    };
-- 
2.35.3


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