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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: DjVBFkp5hoM3fCuV2q1yiOHF9jdAbZtl X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA0MDA5OSBTYWx0ZWRfX1PT+NICgQStR t6/IQxy5DAzv6HmJSsNuxN52/dajOHRYBetDaOv2Osy+4cc98ajXyOE9khl6pRdueH3qmpuvjfn m2S7DJcn12jLYSByqq81k4r4TWtQlIEbUCcR1FBb9P01NoYvLrudx72XgLrfkyUssD+V8aR5det WJsgq03MKIW3f0DuqM5XBOz2uSXS8P/8W1lxR6HATIV8KLahxq1lwa31V/F6xzDH33ua3nzzuVH lPw/JsVMaKkEsvmZNObySTypDgz/jHFmv/4zB9RDGhs/xJuBFKqwr/jhEY4+3Z6Wn//IvZmNn5X VF17Ci7Autve/furKGzG6WqjEntzWJnyEbPvybM9jzIJvvTLHZNmaQADZQfKoVAWZEQRjCzGR1p lb09NHCOxtq6G76XocRVb2Ymy2Q4mRMHIrIP4v9snsBzrhNM8JN9kEZZvQqVAouqgNnbwljN15Y pSsscsA8sm+8KPCEEMw== X-Authority-Analysis: v=2.4 cv=dqLrzVg4 c=1 sm=1 tr=0 ts=69f864da cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=DWWpLck2SfFL7czMIZ0A:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-ORIG-GUID: DjVBFkp5hoM3fCuV2q1yiOHF9jdAbZtl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-04_03,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 suspectscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 adultscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605040099 On 4/27/2026 3:25 PM, Sumit Garg via OP-TEE wrote: > From: Sumit Garg > > Qcom platforms has the legacy of using non-standard SCM calls > splintered over the various kernel drivers. These SCM calls aren't > compliant with the standard SMC calling conventions which is a > prerequisite to enable migration to the FF-A specifications from Arm. > > OP-TEE as an alternative trusted OS to Qualcomm TEE (QTEE) can't > support these non-standard SCM calls. And even for newer architectures > using S-EL2 with Hafnium support, QTEE won't be able to support SCM > calls either with FF-A requirements coming in. And with both OP-TEE > and QTEE drivers well integrated in the TEE subsystem, it makes further > sense to reuse the TEE bus client drivers infrastructure. > > The added benefit of TEE bus infrastructure is that there is support > for discoverable/enumerable services. With that client drivers don't > have to manually invoke a special SCM call to know the service status. > > So enable the generic Peripheral Authentication Service (PAS) provided > by the firmware. It acts as the common layer with different TZ > backends plugged in whether it's an SCM implementation or a proper > TEE bus based PAS service implementation. > > Signed-off-by: Sumit Garg > --- Reviewed-by: Harshal Dev Regards, Harshal