[PATCH 1/3] [RFC] dt-bindings: nvmem: syscon: Add syscon backed nvmem bindings
Marek Vasut
marex at denx.de
Thu Oct 27 15:50:18 PDT 2022
Add trivial bindings for driver which permits exposing syscon backed
register to userspace. This is useful e.g. to expose U-Boot boot
counter on various platforms where the boot counter is stored in
random volatile register, like STM32MP15xx TAMP_BKPxR register.
Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
Cc: Rafał Miłecki <rafal at milecki.pl>
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
Cc: devicetree at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
To: linux-arm-kernel at lists.infradead.org
---
.../bindings/nvmem/nvmem-syscon.yaml | 39 +++++++++++++++++++
1 file changed, 39 insertions(+)
create mode 100644 Documentation/devicetree/bindings/nvmem/nvmem-syscon.yaml
diff --git a/Documentation/devicetree/bindings/nvmem/nvmem-syscon.yaml b/Documentation/devicetree/bindings/nvmem/nvmem-syscon.yaml
new file mode 100644
index 0000000000000..3035a0b2cd24a
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/nvmem-syscon.yaml
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/nvmem-syscon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic syscon backed nvmem
+
+maintainers:
+ - Marek Vasut <marex at denx.de>
+
+allOf:
+ - $ref: "nvmem.yaml#"
+
+properties:
+ compatible:
+ enum:
+ - nvmem-syscon
+
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ tamp at 5c00a000 {
+ compatible = "st,stm32-tamp", "syscon", "simple-mfd";
+ reg = <0x5c00a000 0x400>;
+
+ nvmem-syscon {
+ compatible = "nvmem-syscon";
+ reg = <0x14c 0x4>;
+ };
+ };
--
2.35.1
More information about the linux-arm-kernel
mailing list