On Wed, Apr 28, 2021 at 04:50:38PM +0300, Nandor Han wrote: > Documents the device tree bindings for `bootcount-nvmem` driver. > > Signed-off-by: Nandor Han <nandor.han@xxxxxxxxxxx> > --- > .../bindings/nvmem/bootcount-nvmem.yaml | 66 +++++++++++++++++++ > 1 file changed, 66 insertions(+) > create mode 100644 Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml > > diff --git a/Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml b/Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml > new file mode 100644 > index 000000000000..cc673452fe0f > --- /dev/null > +++ b/Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml > @@ -0,0 +1,66 @@ > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause > +# Copyright (c) Vaisala Oyj. All rights reserved. > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/nvmem/bootcount-nvmem.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Bootcount NVMEM bindings > + > +maintainers: > + - Nandor Han <nandor.han@xxxxxxxxxxx> > + > +description: | > + This binding is intendent to describe the hardware location for > + storing the bootcount value and magic combo. > + > + The NVMEM cell size should be 2 or 4 bytes. > + > +allOf: > + - $ref: "nvmem-consumer.yaml#" > + > +properties: > + compatible: > + enum: > + - linux,bootcount-nvmem What makes this Linux specific? IIRC, u-boot has boot counting function too. > + > + nvmem-cells: > + description: Phandle to reboot mode nvmem data cell. > + $ref: /schemas/types.yaml#/definitions/phandle-array > + > + nvmem-cell-names: > + description: Name of the NVMEM cell. > + $ref: /schemas/types.yaml#/definitions/string-array > + enum: > + - bootcount-regs > + > + linux,bootcount-magic: > + description: Override default mask value. > + $ref: /schemas/types.yaml#/definitions/uint32 I don't understand what this is. Is it magic or a mask? > + > +dependencies: > + nvmem-cell-names: [ nvmem-cells ] Core schema takes care of this. > + > +required: > + - compatible > + - nvmem-cells > + - nvmem-cell-names > + > +additionalProperties: false > + > +examples: > + # example with 16 bit nvram cell: > + - | > + bootcount { > + compatible = "linux,bootcount-nvmem"; > + nvmem-cells = <&bootcount_regs>; > + nvmem-cell-names = "bootcount-regs"; > + }; > + > + rtc: rtc@68 { > + bootcount_regs: bootcount_nvmem_regs@e { > + reg = <0x0e 0x2>; It would be simpler to just add a compatible here and get rid of the 'bootcount' node here. > + }; > + }; > + > +... > -- > 2.26.3 >
