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[98.128.249.223]) by smtp.gmail.com with ESMTPSA id u8sm290407ljj.1.2020.12.16.05.47.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Dec 2020 05:47:01 -0800 (PST) Date: Wed, 16 Dec 2020 14:46:59 +0100 From: Jens Wiklander To: Sudeep Holla Cc: Rob Herring , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Trilok Soni , arve@android.com, Andrew Walbran , David Hartley , Achin Gupta , Arunachalam Ganapathy Subject: Re: [PATCH v3 1/7] dt-bindings: Arm: Add Firmware Framework for Armv8-A (FF-A) binding Message-ID: <20201216134659.GA4146223@jade> References: <20201204121137.2966778-1-sudeep.holla@arm.com> <20201204121137.2966778-2-sudeep.holla@arm.com> <20201214220107.GA2430387@robh.at.kernel.org> <20201216122408.2fhubdyqm2ofpgc3@bogus> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20201216122408.2fhubdyqm2ofpgc3@bogus> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Wed, Dec 16, 2020 at 12:24:08PM +0000, Sudeep Holla wrote: > On Mon, Dec 14, 2020 at 04:01:07PM -0600, Rob Herring wrote: > > On Fri, Dec 04, 2020 at 12:11:31PM +0000, Sudeep Holla wrote: > > > Since the FF-A v1.0 specification doesn't list the UUID of all the > > > partitions in the discovery API, we need to specify the UUID of the > > > partitions that need to be accessed by drivers within the kernel. > > > > > > This binding to provide the list of partitions that kernel drivers > > > may need to access. > > > > > > Signed-off-by: Sudeep Holla > > > --- > > > .../devicetree/bindings/arm/arm,ffa.yaml | 58 +++++++++++++++++++ > > > 1 file changed, 58 insertions(+) > > > create mode 100644 Documentation/devicetree/bindings/arm/arm,ffa.yaml > > > > > > diff --git a/Documentation/devicetree/bindings/arm/arm,ffa.yaml b/Documentation/devicetree/bindings/arm/arm,ffa.yaml > > > new file mode 100644 > > > index 000000000000..a014a5801c34 > > > --- /dev/null > > > +++ b/Documentation/devicetree/bindings/arm/arm,ffa.yaml > > > @@ -0,0 +1,58 @@ > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > > +%YAML 1.2 > > > +--- > > > +$id: http://devicetree.org/schemas/arm/arm,ffa.yaml# > > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > > + > > > +title: Arm Firmware Framework for Arm v8-A (in-kernel users) > > > + > > > +maintainers: > > > + - Sudeep Holla > > > + > > > +description: | > > > + Firmware frameworks implementing partition according to the FF-A > > > + specification defined by ARM document number ARM DEN 0077A ("Arm Firmware > > > + Framework for Arm v8-A") [0], providing services to be used by other > > > + partitions. > > > + > > > + [0] https://developer.arm.com/docs/den0077/latest > > > + > > > +properties: > > > + $nodename: > > > + const: ffa > > > + > > > + compatible: > > > + oneOf: > > > + - const: arm,ffa-1.0 > > > + > > > +patternProperties: > > > + "^ffa_partition[0-9]+$": > > > + type: object > > > + description: One or more child nodes, each describing an FFA partition. > > > + properties: > > > + $nodename: > > > + const: ffa_partition > > > + > > > + compatible: > > > + oneOf: > > > + - const: arm,ffa-1.0-partition > > > + > > > + uuid: > > > + $ref: '/schemas/types.yaml#definitions/string' > > > + description: | > > > + The 128-bit UUID [2] of the service implemented by this partition. > > > + > > > + [2] https://tools.ietf.org/html/rfc4122 > > > > UUIDs are actually a known thing in json-schema with 'format: uuid'. > > The meta-schema will probably reject that, so we'll need to add support > > to dtschema. Maybe it should be a new definition to reference. > > > > Ah OK, I will try that and ask for help if I am stuck as I am still trying > to learn these, not there yet 😄 > > > > + > > > +additionalProperties: false > > > + > > > +examples: > > > + - | > > > + ffa { > > > + compatible = "arm,ffa-1.0"; > > > + > > > + ffa_partition0 { > > > + compatible = "arm,ffa-1.0-partition"; > > > + uuid = "12345678-9abc-def0-1234-56789abcdef0"; > > > + }; > > > + }; > > > > This could all be simplified down to just a single property: > > > > Thanks for the suggestion, I would love this to force spec authors to > stop relying on DT and add whatever needed in future to the spec as part > of discovery APIs. > > > arm,ffa-partitions = "12345678-9abc-def0-1234-56789abcdef0", > > "12345678-9abc-def0-1234-56789abcdef1" > > "12345678-9abc-def0-1234-56789abcdef2"; > > > > Obviously, that's not extensible, but do we need it to be? > > > > I prefer if we don't, but I will run this through spec authors so that > they are aware of what we will do in DT which means they *have* to > incorporate any future needs into the spec discovery apis. Speaking of discovery apis, doesn't the FF-A spec already have that? Or am I missing something? Cheers, Jens > > Ah I forgot the spec author is cc-ed. @Achin please shout if you see > issues with this approach. > > -- > Regards, > Sudeep