linux-kernel - Re: [PATCH v5 3/4] dt-bindings: arm: amlogic: amlogic,meson-gx-ao-secure: add secure-monitor property

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Date: Tue, 11 Jun 2024 19:07:28 +0100
From: Conor Dooley <conor@...nel.org>
To: Viacheslav <adeep@...ina.in>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 3/4] dt-bindings: arm: amlogic:
 amlogic,meson-gx-ao-secure: add secure-monitor property

On Tue, Jun 11, 2024 at 01:25:11PM +0300, Viacheslav wrote:
> Hi!
> 
> 10/06/2024 19.08, Conor Dooley wrote:
> > On Mon, Jun 10, 2024 at 11:39:49AM +0300, Viacheslav Bocharov wrote:
> > > Add secure-monitor property to schema for meson-gx-socinfo-sm driver.
> > 
> > "bindings are for hardware, not drivers". Why purpose does the "secure
> > monitor" serve that the secure firmware needs a reference to it?
> 
> This driver is an extension to the meson-gx-socinfo driver: it supplements
> information obtained from the register with information from the
> SM_GET_CHIP_ID secure monitor call. Due to the specifics of the module
> loading order, we cannot do away with meson-gx-socinfo, as it is used for
> platform identification in some drivers. Therefore, the extended information
> is formatted as a separate driver, which is loaded after the secure-monitor
> driver.

Please stop talking about drivers, this is a binding which is about
hardware. Please provide, in your next version, a commit message that
justifies adding this property without talking about driver probing
order etc, and instead focuses on what service the "secure monitor"
provides etc.

> The ability to obtain additional information depends on the support for the
> call in the secure-monitor, which can be described by an additional link
> from the amlogic,meson-gx-ao-secure node to the secure-monitor node, similar
> to how it is done for amlogic,meson-gxbb-efuse.
> 
> > 
> > Thanks,
> > Conor.
> > 
> > > 
> > > Signed-off-by: Viacheslav Bocharov <adeep@...ina.in>
> > > ---
> > >   .../bindings/arm/amlogic/amlogic,meson-gx-ao-secure.yaml      | 4 ++++
> > >   1 file changed, 4 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/arm/amlogic/amlogic,meson-gx-ao-secure.yaml b/Documentation/devicetree/bindings/arm/amlogic/amlogic,meson-gx-ao-secure.yaml
> > > index 7dff32f373cb..1128a794ec89 100644
> > > --- a/Documentation/devicetree/bindings/arm/amlogic/amlogic,meson-gx-ao-secure.yaml
> > > +++ b/Documentation/devicetree/bindings/arm/amlogic/amlogic,meson-gx-ao-secure.yaml
> > > @@ -32,6 +32,10 @@ properties:
> > >     reg:
> > >       maxItems: 1
> > > +  secure-monitor:
> > 
> > Missing a vendor prefix.
> > 
> > > +    description: phandle to the secure-monitor node
> > > +    $ref: /schemas/types.yaml#/definitions/phandle
> > > +
> > >     amlogic,has-chip-id:
> > >       description: |
> > >         A firmware register encodes the SoC type, package and revision
> > > -- 
> > > 2.45.2
> > > 
> > > 
> > > _______________________________________________
> > > linux-amlogic mailing list
> > > linux-amlogic@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-amlogic
> 
> --
> with regards,
> Viacheslav

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