On Tue, Mar 02, 2021 at 08:44:04AM +0100, Rafał Miłecki wrote: > From: Rafał Miłecki <rafal@xxxxxxxxxx> > > NVRAM structure contains device data and can be accessed using MMIO. > > Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx> > --- > .../bindings/firmware/brcm,nvram.yaml | 41 +++++++++++++++++++ > 1 file changed, 41 insertions(+) > create mode 100644 Documentation/devicetree/bindings/firmware/brcm,nvram.yaml > > diff --git a/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml > new file mode 100644 > index 000000000000..12af8e2e7c9c > --- /dev/null > +++ b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml > @@ -0,0 +1,41 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: "http://devicetree.org/schemas/firmware/brcm,nvram.yaml#"; > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"; > + > +title: Broadcom's NVRAM > + > +maintainers: > + - Rafał Miłecki <rafal@xxxxxxxxxx> > + > +description: | > + NVRAM is a structure containing device specific environment variables. > + It is used for storing device configuration, booting parameters and > + calibration data. The structure of the data is fully discoverable just from a genericish 'brcm,nvram'? And it's a dedicated memory outside of regular RAM? > + > + It's required very early in booting process and so is made available > + using memory mapping. > + > + NVRAM can be found on Broadcom BCM47xx MIPS, Northstar ARM Cortex-A9 > + and some more devices. > + > +properties: > + compatible: > + const: brcm,nvram > + > + reg: > + description: memory region with NVRAM data > + maxItems: 1 > + > +required: > + - reg > + > +additionalProperties: false > + > +examples: > + - | > + nvram@1e000000 { > + compatible = "brcm,nvram"; > + reg = <0x1e000000 0x10000>; > + }; > -- > 2.26.2 >
