From: acampanella-thegoodpenguin <acampanella@thegoodpenguin.co.uk>
To: linux-embedded@vger.kernel.org
Subject: [PATCH PREVIEW RFC 6/6] dt-bindings: bootcache: Add bindings for bootcache backend
Date: Tue, 23 Sep 2025 15:23:43 +0100 [thread overview]
Message-ID: <20250923-bootcache-v1-6-4f86fdc38b4e@thegoodpenguin.co.uk> (raw)
In-Reply-To: <20250923-bootcache-v1-0-4f86fdc38b4e@thegoodpenguin.co.uk>
From: Marc Kelly <mkelly@thegoodpenguin.co.uk>
Add device tree bindings for the bootcache_backend_memory.
Signed-off-by: Marc Kelly <mkelly@thegoodpenguin.co.uk>
---
.../bootcache/linux,bootcache-backend-memory.yaml | 67 ++++++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 68 insertions(+)
diff --git a/Documentation/devicetree/bindings/bootcache/linux,bootcache-backend-memory.yaml b/Documentation/devicetree/bindings/bootcache/linux,bootcache-backend-memory.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..cf46bf4c513e263f67cdf2323349fa16837c8d22
--- /dev/null
+++ b/Documentation/devicetree/bindings/bootcache/linux,bootcache-backend-memory.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bootcache/linux,bootcache-backend-memory.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bootcache Framework reserved memory backend
+
+maintainers:
+ - Marc Kelly <mkelly@thegoodpenguin.co.uk>
+ - Andrea Campenella <acampenella@thegoodpenguin.co.uk>
+
+description:
+ This bootcache backend adds support for using reserved memory
+ for the storage location for bootcache data. On initialization this
+ memory is read and any bootcache entries found are added to the
+ bootcache framework.
+ Data is inserted into these memory locations via the bootloader
+ or other means before the kernel boots.
+
+properties:
+ compatible:
+ enum:
+ - linux,backend-backend-memory
+
+ reg:
+ maxItems: 2
+
+ memory-region:
+ maxItems: 1
+ description:
+ Contains the bootcache reserved memory.
+ Data format is a binary block of packed cache data consisting
+ of a selection of key and value pairs, along with size indicators.
+ The format should be considered private to the driver and should
+ not be interpreted outside of the drivers context.
+
+required:
+ - compatible
+ - reg
+ - memory-region
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ /*
+ * The bootcache-backend is placed in the in the main domain
+ * of the SOC, with the reserved memory location defined as
+ * follows.
+ * This defines 64kBytes in the upper 2GBytes.
+ *
+ * The size
+ * reserved-memory {
+ * bootcache_reserved: bootcache-reserved@BFFF0000 {
+ * no-map;
+ * reg = <0x00 0xBFFF0000 0x00 0x10000>;
+ * label = "bootcache_backend_memory";
+ * };
+ * }
+ */
+
+ bootcache-backend@BFFF0000 {
+ compatible = "linux,backend-backend-memory";
+ reg = <0x00 0xBFFF0000 0x00 0x10000>;
+ memory-region = <&bootcache_reserved>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 73679686d49ac653382ecb32b9b3b500a4509383..d547fe2fa77f6fabdd19be3c0a68526d2f6d2d4d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4422,6 +4422,7 @@ BOOT CACHE
M: Andrea Campanella <acampanella@thegoodpenguin.co.uk>
M: Marc Kelly <mkelly@thegoodpenguin.co.uk>
S: Maintained
+F: Documentation/devicetree/bindings/bootcache/linux,bootcache-backend-memory.yaml
F: drivers/base/bootcache.c
F: drivers/base/bootcache_*
F: include/linux/bootcache.h
--
2.48.1
next prev parent reply other threads:[~2025-09-23 14:23 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-23 14:23 [PATCH PREVIEW RFC 0/6] Add support for boot-time caching acampanella-thegoodpenguin
2025-09-23 14:23 ` [PATCH PREVIEW RFC 1/6] base: bootcache: initial commit acampanella-thegoodpenguin
2025-09-29 23:38 ` Bird, Tim
2025-09-30 8:24 ` Andrea Campanella
2025-09-23 14:23 ` [PATCH PREVIEW RFC 2/6] raid6: Add bootcache acampanella-thegoodpenguin
2025-09-23 14:23 ` [PATCH PREVIEW RFC 3/6] crypto: use bootcache to cache fastest algorithm acampanella-thegoodpenguin
2025-09-29 23:48 ` Bird, Tim
2025-09-30 11:37 ` Andrew Murray
2025-09-23 14:23 ` [PATCH PREVIEW RFC 4/6] base: bootcache: Add bootcache test backend acampanella-thegoodpenguin
2025-09-23 14:23 ` [PATCH PREVIEW RFC 5/6] base: bootcache: Add bootcache memory backend acampanella-thegoodpenguin
2025-09-24 14:42 ` Dan Scally
2025-09-24 15:13 ` Andrea Campanella
2025-09-26 17:34 ` Marc Kelly
2025-09-26 20:09 ` Dan Scally
2025-09-23 14:23 ` acampanella-thegoodpenguin [this message]
2025-09-30 12:49 ` [PATCH PREVIEW RFC 0/6] Add support for boot-time caching Rob Landley
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