On Fri, Jan 27, 2023 at 07:46:49PM +0100, Maximilian Luz wrote: > Add bindings for the Qualcomm Secure Execution Environment interface > (QSEECOM). > > Signed-off-by: Maximilian Luz <luzmaximilian@xxxxxxxxx> > --- > > Changes in v2: > - Replaces uefisecapp bindings. > - Fix various dt-checker complaints. > > --- > .../bindings/firmware/qcom,qseecom.yaml | 49 +++++++++++++++++++ > MAINTAINERS | 1 + > 2 files changed, 50 insertions(+) > create mode 100644 Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml > > diff --git a/Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml b/Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml > new file mode 100644 > index 000000000000..540a604f81bc > --- /dev/null > +++ b/Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml > @@ -0,0 +1,49 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/firmware/qcom,qseecom.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Qualcomm Secure Execution Environment Communication Interface > + > +maintainers: > + - Maximilian Luz <luzmaximilian@xxxxxxxxx> > + > +description: | > + QSEECOM provides an interface to Qualcomm's Secure Execution Environment > + (SEE) running in the Trust Zone via SCM calls. In particular, it allows SCM is SMCCC or something else? > + communication with secure applications running therein. > + > + Applications running in this environment can, for example, include > + 'uefisecapp', which is required for accessing UEFI variables on certain > + systems as these cannot be accessed directly. > + > +properties: > + compatible: > + items: > + - enum: > + - qcom,qseecom-sc8280xp > + - const: qcom,qseecom > + > + qcom,scm: > + $ref: '/schemas/types.yaml#/definitions/phandle' > + description: > + A phandle pointing to the QCOM SCM device (see ./qcom,scm.yaml). > + > +required: > + - compatible > + - qcom,scm > + > +additionalProperties: false > + > +examples: > + - | > + firmware { > + scm { > + compatible = "qcom,scm-sc8280xp", "qcom,scm"; > + }; > + qseecom { > + compatible = "qcom,qseecom-sc8280xp", "qcom,qseecom"; > + qcom,scm = <&scm>; Why do you need this in DT? If you already know you have a firmware interface (via "qcom,scm"), then query the firmware to see if the SEE is there. Rob
