| Message ID | 20210112142342.7290-2-nsaenzjulienne@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Expose RPi4's bootloader configuration | expand |
On Tue, 12 Jan 2021 15:23:38 +0100, Nicolas Saenz Julienne wrote: > Firmware/co-processors might use reserved memory areas in order to pass > data stemming from an nvmem device otherwise non accessible to Linux. > For example an EEPROM memory only physically accessible to firmware, or > data only accessible early at boot time. > > Introduce the dt-bindings to nvmem's rmem. > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > > --- > > Changes since v2: > - Run yamllint and fix indentation issues > > Changes since v1: > - Update schema to new driver design > > .../devicetree/bindings/nvmem/rmem.yaml | 49 +++++++++++++++++++ > 1 file changed, 49 insertions(+) > create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml > Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/nvmem/rmem.yaml b/Documentation/devicetree/bindings/nvmem/rmem.yaml new file mode 100644 index 000000000000..1d85a0a30846 --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/rmem.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/nvmem/rmem.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Reserved Memory Based nvmem Device + +maintainers: + - Nicolas Saenz Julienne <nsaenzjulienne@suse.de> + +allOf: + - $ref: "nvmem.yaml#" + +properties: + compatible: + items: + - enum: + - raspberrypi,bootloader-config + - const: nvmem-rmem + + no-map: + $ref: /schemas/types.yaml#/definitions/flag + description: + Avoid creating a virtual mapping of the region as part of the OS' + standard mapping of system memory. + +required: + - compatible + - no-map + +unevaluatedProperties: false + +examples: + - | + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + + blconfig: nvram@10000000 { + compatible = "raspberrypi,bootloader-config", "nvmem-rmem"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x10000000 0x1000>; + no-map; + }; + }; + +...
Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. Introduce the dt-bindings to nvmem's rmem. Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> --- Changes since v2: - Run yamllint and fix indentation issues Changes since v1: - Update schema to new driver design .../devicetree/bindings/nvmem/rmem.yaml | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml