linux-kernel - Re: [PATCH 1/6] dt-bindings: nvmem: Add bindings for rmem driver

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Message-ID: <6773252eb539f09383f2b31118467b0be23e592a.camel@suse.de>
Date:   Tue, 15 Dec 2020 22:16:54 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        devicetree@...r.kernel.org,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH 1/6] dt-bindings: nvmem: Add bindings for rmem driver

On Tue, 2020-12-15 at 14:25 -0600, Rob Herring wrote:
> On Tue, Dec 15, 2020 at 9:56 AM Nicolas Saenz Julienne
> <nsaenzjulienne@...e.de> 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@...e.de>
> > ---
> >  .../devicetree/bindings/nvmem/rmem.yaml       | 35 +++++++++++++++++++
> >  1 file changed, 35 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/nvmem/rmem.yaml b/Documentation/devicetree/bindings/nvmem/rmem.yaml
> > new file mode 100644
> > index 000000000000..3037ebc4634d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/nvmem/rmem.yaml
> > @@ -0,0 +1,35 @@
> > +# 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@...e.de>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - nvmem-rmem
> > +
> > +  memory-region:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description:
> > +      phandle to the reserved memory region
> 
> There's no need for this indirection. Just add a compatible to the
> reserved-memory node. See ramoops for example.
> 
> Please make the compatible specific enough to define what the memory
> contains. If you want 'nvmem-rmem' as a fallback that's fine.

Ok, I'll look into it.

Regards,
Nicolas


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