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Mon, 09 Nov 2026 13:01:54 -0800 (PST) Received: from sid-dev-env.cgrhrlrrq2nuffriizdlnb1x4b.xx.internal.cloudapp.net ([4.155.54.158]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b168ed00d2sm275299a91.1.2026.11.09.13.01.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 13:01:53 -0800 (PST) From: Siddharth Chintamaneni To: Andi Shyti , Mika Westerberg , "Rafael J . Wysocki" Cc: Andy Shevchenko , Len Brown , linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, apais@microsoft.com, rlmenge@gmail.com, hargar@linux.microsoft.com, Siddharth Chintamaneni , Jarred White , Jeff Kirsher Subject: [PATCH v2 1/1] i2c: designware: Add ACPI ID MSFT0006 for Microsoft Cobalt SoCs Date: Mon, 9 Nov 2026 21:01:46 +0000 Message-ID: <20261109210146.57766-1-sidchintamaneni@gmail.com> X-Mailer: git-send-email 2.43.0 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 Content-Transfer-Encoding: 8bit Add the MSFT0006 ACPI ID for the DesignWare I2C controller integrated on Microsoft Cobalt SoCs, along with its 300 MHz input clock description in acpi_apd.c. Without an explicit MSFT0006 entry, ACPI device matching falls back to its _CID (APMC0D0F), which configures a 100 MHz input clock instead of the controller's actual 300 MHz clock. Acked-by: Jarred White Acked-by: Jeff Kirsher Signed-off-by: Siddharth Chintamaneni --- drivers/acpi/acpi_apd.c | 6 ++++++ drivers/i2c/busses/i2c-designware-platdrv.c | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c index ea226fd987567..66a7607752d9b 100644 --- a/drivers/acpi/acpi_apd.c +++ b/drivers/acpi/acpi_apd.c @@ -198,6 +198,11 @@ static const struct apd_device_desc hjmc_i2c_desc = { .fixed_clk_rate = 200 * HZ_PER_MHZ, }; +static const struct apd_device_desc msft_i2c_desc = { + .setup = acpi_apd_setup, + .fixed_clk_rate = 300 * HZ_PER_MHZ, +}; + #endif /* CONFIG_ARM64 */ #endif @@ -272,6 +277,7 @@ static const struct acpi_device_id acpi_apd_device_ids[] = { { "HJMC3001", APD_ADDR(hjmc_i2c_desc) }, { "LECA0002", APD_ADDR(leca_spi_desc) }, { "LECA0003", APD_ADDR(leca_i2c_desc) }, + { "MSFT0006", APD_ADDR(msft_i2c_desc) }, { "NXP0001", APD_ADDR(nxp_i2c_desc) }, #endif { } diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 13dd7c50486a4..cf364f3c26199 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -280,6 +280,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = { { .id = "INT3433" }, { .id = "INTC10EF" }, { .id = "LECA0003" }, + { .id = "MSFT0006" }, { } }; MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); -- 2.45.4