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Message-ID: <CAL_JsqK7zZdWi0orXoqPWqvvxP3H6n7=JRqhdeAiAYAHRS3WHQ@mail.gmail.com>
Date: Tue, 15 Dec 2020 14:25:34 -0600
From: Rob Herring <robh+dt@...nel.org>
To: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
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, 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.
> +
> +required:
> + - compatible
> + - memory-region
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + fw-config {
> + compatible = "nvmem-rmem";
> + memory-region = <&mem>;
> + };
> +
> +...
> --
> 2.29.2
>
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