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Wed, 05 Nov 2025 03:49:40 -0800 (PST) X-Google-Smtp-Source: AGHT+IEFviZmOscvu3WeDg7aLm2At05oLETpKTO0Bo+Vv4IMN5Nrz6eqob/nlu0UHv+XYfNOe61kkg== X-Received: by 2002:a05:622a:830f:b0:4ed:44a7:cf78 with SMTP id d75a77b69052e-4ed723a8f55mr30373751cf.34.1762343379595; Wed, 05 Nov 2025 03:49:39 -0800 (PST) Received: from localhost ([2a01:4b00:b703:c200:1ac0:4dff:fe39:5426]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-4775cdc2d14sm44637865e9.1.2025.11.05.03.49.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Nov 2025 03:49:39 -0800 (PST) From: Punit Agrawal To: Sudeep Holla Cc: Cristian Marussi , arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 0/8] firmware: arm_scmi: Refactoring and enablement of ACPI PCC transport In-Reply-To: <20251017-acpi_scmi_pcc-v1-0-0adbab7709d9@arm.com> (Sudeep Holla's message of "Fri, 17 Oct 2025 14:23:43 +0100") References: <20251017-acpi_scmi_pcc-v1-0-0adbab7709d9@arm.com> Date: Wed, 05 Nov 2025 11:49:38 +0000 Message-ID: <87wm44aect.fsf@stealth> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-ORIG-GUID: 9EpEEYtmXMBbYrEILB_k_Szdupq199pY X-Proofpoint-GUID: 9EpEEYtmXMBbYrEILB_k_Szdupq199pY X-Authority-Analysis: v=2.4 cv=YZKwJgRf c=1 sm=1 tr=0 ts=690b39d5 cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=xqWC_Br6kY4A:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=7CQSdrXTAAAA:8 a=XzXL5FNJrteVcywYxDQA:9 a=kacYvNCVWA4VmyqE58fU:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA1MDA4OCBTYWx0ZWRfX/RaXWcgTdg5B eJRmoV1RjRt6paHUtFUT/aQO1ujeqG5ovd3E887p6T/nxrZSs2SBRcC7050kUH+jehWg3Wa2gfw cR3c9b//iyK45rIHfimZwSBSDUMvIrQATOTFGQ2u0Lik7bVurQG8IR7pvW5UvxtsUnF09aTD6Lg hMWiE9hYIBkYw87wRd2WGPaf/vyiRVSBmcdiZ6Izstex+b5yf5quxHF9/esplef4MWpcQL6fa/W SeNUX0jNdRB6fc021qFG4GA/k+vrAOHekshHTAbWnr/SGP5Q0rP3ULVj3mIl9qhPqN1DT3dX6/i UAvmqJY5mtfAXdDYV1AK0SkucJlvv2HCq49XD4mcRdTslXKjtwwd58lOQWGfmICZNNnYmDoe40R wxNsNLY7ehNKCULXREKU5KaE9aWbBA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-05_04,2025-11-03_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 impostorscore=0 adultscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 bulkscore=0 suspectscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511050088 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251105_034943_546157_EC29F0EC X-CRM114-Status: GOOD ( 24.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Sudeep, Sudeep Holla writes: > The SCMI can be utilized in systems using either the FDT or ACPI specification. > While FDT-based systems can natively use SCMI, ACPI-based systems often > need to abstract the functionality provided by SCMI under ASL methods. > So far, there has been no need to support SCMI natively on ACPI systems. > > However, with the addition of a few new protocols such as Powercap and Telemetry, > which lack abstractions in the ACPI specification, there is now a need to > run SCMI natively for those use cases. > > This patch series introduces ACPI PCC transport support for the Arm SCMI > framework, alongside several foundational refactors and enhancements to > achieve firmware-node neutrality between Device Tree (DT) and ACPI systems. > > The key changes include: > > 1. ACPI/DT abstraction and fwnode transition > > Converted the core SCMI code to use `fwnode_handle` instead of DT-specific > structures, ensuring seamless operation across both ACPI and DT > environments. All property lookups, child enumeration, and device > association paths have been updated accordingly. > > 2. Unified transport registration for ACPI and DT > > Extended the SCMI transport driver macros to support ACPI match tables, > enabling transports to probe using ACPI device IDs while maintaining > backward compatibility with DT-only systems. > > 3. Protocol device initialization and refactoring > > Refactored the protocol device creation and validation logic into a new > helper for improved readability and maintainability. Enhanced the > initialization logic to handle ACPI-based SCMI devices without explicit > child fwnodes. > > 4. Introduction of ACPI PCC transport > > Added a new SCMI transport driver leveraging ACPI PCCT (Platform > Communications Channel Table) subspaces via the Linux PCC mailbox > framework. This enables SCMI communication over PCC on ACPI-based > platforms. > > Collectively, these changes lay the groundwork for robust SCMI operation on > ACPI platforms, achieving near parity with DT systems where applicable, > while enabling the new PCC transport path for firmware communication. I was interested in taking a closer look at the patches here but they have a dependency on support for the telemetry protocol patches. I get a compile error. I was wondering if you have a branch with the dependencies included. Are the v1 telemetry support patches[0] the right version to be using? Thanks, Punit [0] https://lore.kernel.org/all/20250925203554.482371-1-cristian.marussi@arm.com/ [...]