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[2.205.18.108]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b48652a9ebbsm1607940866b.7.2025.10.08.02.14.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Oct 2025 02:14:37 -0700 (PDT) Message-ID: <48d0fb45-096c-4caa-b51c-753c2f17f018@gmail.com> Date: Wed, 8 Oct 2025 11:14:37 +0200 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: linux-acpi@vger.kernel.org Cc: "Rafael J. Wysocki" , Andy Shevchenko From: Jonas Gorski Subject: i2c-mux ACPI parent device references in example Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi, I'm currently trying to wrap my head around describing devices via SSDT. While reading Documentation/firmware-guide/acpi/i2c-muxes.rst, the references used for the devices behind the mux confuse me a bit. The tree from the example is: Device (SMB1) { Device (MUX0) { Device (CH00) { Device (CLIA) { Name (_CRS, ResourceTemplate () { I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED, AddressingMode7Bit, "\\_SB.SMB1.CH00", 0x00, ResourceConsumer,,) } } } Device (CH01) { Device (CLIB) { Name (_CRS, ResourceTemplate () { I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED, AddressingMode7Bit, "\\_SB.SMB1.CH01", 0x00, ResourceConsumer,,) } } } } } Is there a ".MUX0" missing in the references, or is it correct that it is not present? E.g. should it be "\\_SB.SMB1.MUX0.CH00" instead of "\\_SB.SMB1.CH00"? FWIW, the references were changed from relative to absolute in e65cb011349e ("Documentation: ACPI: Fix parent device references"). Best regards, Jonas