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@xxxxxxx> --- Cc: Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx> Cc: Rafał Miłecki <rafal@xxxxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> Cc: devicetree@xxxxxxxxxxxxxxx Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx --- .../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@xxxxxxx> + +allOf: + - $ref: "nvmem.yaml#" + +properties: + compatible: + enum: + - nvmem-syscon + + reg: + maxItems: 1 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + tamp@5c00a000 { + compatible = "st,stm32-tamp", "syscon", "simple-mfd"; + reg = <0x5c00a000 0x400>; + + nvmem-syscon { + compatible = "nvmem-syscon"; + reg = <0x14c 0x4>; + }; + }; -- 2.35.1
