linux-kernel - Re: [PATCH v4 6/8] dt-bindings: Add support for Amlogic GXBB SCPI Interface

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Date:   Sat, 29 Oct 2016 11:39:05 -0700
From:   Olof Johansson <olof@...om.net>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-amlogic@...ts.infradead.org,
        Kevin Hilman <khilman@...libre.com>,
        Heiko Stübner <heiko@...ech.de>,
        wxt@...k-chips.com, frank.wang@...k-chips.com
Subject: Re: [PATCH v4 6/8] dt-bindings: Add support for Amlogic GXBB SCPI Interface

Hi,


On Wed, Oct 5, 2016 at 12:33 AM, Neil Armstrong <narmstrong@...libre.com> wrote:
> Acked-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  Documentation/devicetree/bindings/arm/arm,scpi.txt | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/arm,scpi.txt b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> index faa4b44..04bc171 100644
> --- a/Documentation/devicetree/bindings/arm/arm,scpi.txt
> +++ b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> @@ -7,7 +7,7 @@ by Linux to initiate various system control and power operations.
>
>  Required properties:
>
> -- compatible : should be "arm,scpi"
> +- compatible : should be "arm,scpi" or "amlogic,meson-gxbb-scpi"

This doesn't seem right to document here. If anything you might want
to have a table of more-specific-compatibles for specific
implementations, but "arm,scpi" should still be the compatible of the
node (just not the most specific one).

Also, documenting it here indiciates that non-amlogic implementations
can/should use that compatible, which is misleading.

>  - mboxes: List of phandle and mailbox channel specifiers
>           All the channels reserved by remote SCP firmware for use by
>           SCPI message protocol should be specified in any order
> @@ -60,7 +60,8 @@ A small area of SRAM is reserved for SCPI communication between application
>  processors and SCP.
>
>  Required properties:
> -- compatible : should be "arm,juno-sram-ns" for Non-secure SRAM on Juno
> +- compatible : should be "arm,juno-sram-ns" for Non-secure SRAM on Juno,
> +               or "amlogic,meson-gxbb-sram" for Amlogic GXBB SoC.

Maybe you'd be better of with a meson-specific document that refers to
these but with different compatible values.

Come to think of it, the Juno-specific one maybe shouldn't be in
arm,scpi at all, since that adds confusion here.

It's somewhat confusing that ARM is both a platform, architecture and
in some cases implementer of specific systems. :)

>  The rest of the properties should follow the generic mmio-sram description
>  found in ../../sram/sram.txt
> @@ -70,7 +71,8 @@ Each sub-node represents the reserved area for SCPI.
>  Required sub-node properties:
>  - reg : The base offset and size of the reserved area with the SRAM
>  - compatible : should be "arm,juno-scp-shmem" for Non-secure SRAM based
> -              shared memory on Juno platforms
> +              shared memory on Juno platforms or
> +              "amlogic,meson-gxbb-scp-shmem" for Amlogic GXBB SoC.

Same here. It won't scale if all vendors are expected to add an entry here.


-Olof