[PATCH v6 1/2] schemas: Add some common reserved-memory usages

[Simon Glass]

It is common to split firmware into 'Platform Init', which does the
initial hardware setup and a "Payload" which selects the OS to be booted.
Thus an handover interface is required between these two pieces.

This aims to provide an small schema addition for the memory mapping
needed to keep these two pieces working together well.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v6:
- Drop mention of UEFI
- Use compatible strings instead of node names

Changes in v5:
- Drop the memory-map node (should have done that in v4)
- Tidy up schema a bit

Changes in v4:
- Make use of the reserved-memory node instead of creating a new one

Changes in v3:
- Reword commit message again
- cc a lot more people, from the FFI patch
- Split out the attributes into the /memory nodes

Changes in v2:
- Reword commit message

 .../reserved-memory/common-reserved.yaml      | 71 +++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 dtschema/schemas/reserved-memory/common-reserved.yaml

diff --git a/dtschema/schemas/reserved-memory/common-reserved.yaml b/dtschema/schemas/reserved-memory/common-reserved.yaml
new file mode 100644
index 0000000..4889f59
--- /dev/null
+++ b/dtschema/schemas/reserved-memory/common-reserved.yaml
@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/common-reserved.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Common memory reservations
+
+description: |
+  Specifies that the reserved memory region can be used for the purpose
+  indicated by its compatible string.
+
+  Clients may reuse this reserved memory if they understand what it is for,
+  subject to the notes below.
+
+maintainers:
+  - Simon Glass <sjg at chromium.org>
+
+allOf:
+  - $ref: reserved-memory.yaml
+
+properties:
+  compatible:
+    description: |
+      This describes some common memory reservations:
+
+         acpi-reclaim: Contains ACPI tables; memory may be reclaimed when the
+           tables are no-longer needed
+         acpi-nvs: Contains ACPI Non-volatile-storage data; memory may be
+           reclaimed when the tables are no-longer needed
+         boot-code: Contains code used for booting; memory may be reclaimed by
+           the OS when it is running
+         boot-code: Contains data used for booting; memory may be reclaimed by
+           the OS when it is running
+         runtime-code: Contains code used for interacting with the system when
+           running; memory may be reclaimed if this code is not called
+         runtime-data: Contains data used for interacting with the system when
+           running; memory may be reclaimed if the runtime code is not used
+    enum:
+      - acpi-reclaim
+      - acpi-nvs
+      - boot-code
+      - boot-data
+      - runtime-code
+      - runtime-data
+
+  reg:
+    description: region of memory that is reserved for the purpose indicated
+      by the compatible string.
+
+required:
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        reserved at 12340000 {
+            compatible = "boot-code";
+            reg = <0x12340000 0x00800000>;
+        };
+
+        reserved at 43210000 {
+            compatible = "boot-data";
+            reg = <0x43210000 0x00800000>;
+        };
+    };
-- 
2.42.0.283.g2d96d420d3-goog