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Sat, 14 Nov 2026 15:54:20 -0800 (PST) Received: from [192.168.35.43] ([218.50.238.131]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b50313d8f5sm29226208c88.3.2026.11.14.15.54.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 14 Nov 2026 15:54:19 -0800 (PST) Message-ID: <4b8a7510-808b-40fc-a6c5-551e7d88d5e4@gmail.com> Date: Sun, 15 Nov 2026 08:54:17 +0900 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Reply-To: chanwoo@kernel.org Subject: Re: [PATCH v2 0/2] PM / devfreq: add Airoha SoC Subsystem scale support Content-Language: ko To: Christian Marangi , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20261009073330.18175-1-ansuelsmth@gmail.com> From: Choi Chanwoo In-Reply-To: <20261009073330.18175-1-ansuelsmth@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/9/2026 4:33 PM, Christian Marangi wrote: > Airoha SoC contains multiple subsystem that are scaled to a > specific OPP taking the CPU clock as reference. Such sybsystem > can enter idle or performance state based on the system load > and power consumption conditions. > > Example of such subsystem are GSW (Gigabit Switch), NPU (Custom > Risc Co-Processor for Network acceleration), SOE (Crypto Module) BUS... > > Changes v2: > - Rename to a more symbolic name > - Address some sashiko bot warning > - Better describe the use of this devfreq driver > > Christian Marangi (2): > dt-bindings: devfreq: Document support for Airoha Subsystem Scale > PM / devfreq: add Airoha SoC Subsystem devfreq driver > > .../devfreq/airoha,subsystem-scale.yaml | 114 ++++++++++++++++++ > drivers/devfreq/Kconfig | 10 ++ > drivers/devfreq/Makefile | 1 + > drivers/devfreq/airoha-subsystem-devfreq.c | 100 +++++++++++++++ > 4 files changed, 225 insertions(+) > create mode 100644 Documentation/devicetree/bindings/devfreq/airoha,subsystem-scale.yaml > create mode 100644 drivers/devfreq/airoha-subsystem-devfreq.c > Hi, The devicetree contains ths only clock information for scaling without any parent device information even if this drier has used the passive governor as default. I think that you better to use 'userspace' governor. Also, are there any connected device to provide the utilization? -- Best Regards, Chanwoo Choi Principal Engineer, Samsung Electronics