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Thu, 29 Oct 2026 02:00:08 -0700 (PDT) Received: from at-Standard-PC-Q35-ICH9-2009 ([27.60.20.232]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a23641e78sm16497937eec.0.2026.10.29.01.59.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 02:00:08 -0700 (PDT) From: Atharva Tiwari To: Cc: Atharva Tiwari , Bjorn Helgaas , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Rafael J. Wysocki" , Len Brown , Linus Walleij , Bartosz Golaszewski , Sven Peter , Janne Grunau , Neal Gompa , Guenter Roeck , Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Lee Jones , Pavel Machek , Griffin Kroah-Hartman , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sebastian Reichel , Alexandre Belloni , Wim Van Sebroeck , Jarkko Sakkinen , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Paul Moore , James Morris , "Serge E. Hallyn" , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-leds@vger.kernel.org, mfd@lists.linux.dev, platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [RFC PATCH 09/14] treewide: disable other rtc's in t2 macs Date: Thu, 29 Oct 2026 04:52:06 -0400 Message-ID: <20261029085504.3547-10-atharvatiwarilinuxdev@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261029085504.3547-1-atharvatiwarilinuxdev@gmail.com> References: <20261029085504.3547-1-atharvatiwarilinuxdev@gmail.com> X-Mailing-List: linux-hwmon@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 The CMOS RTC and the ACPI TAD clock don't work correctly on T2 Macs. When macsmc-rtc is enabled, turn them off on these machines so macsmc-rtc is the only clock. Signed-off-by: Atharva Tiwari --- drivers/acpi/acpi_tad.c | 4 ++++ drivers/rtc/rtc-cmos.c | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c index 45459a4ca..a137a39e5 100644 --- a/drivers/acpi/acpi_tad.c +++ b/drivers/acpi/acpi_tad.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -845,6 +846,9 @@ static int acpi_tad_probe(struct platform_device *pdev) return -ENODEV; } + if (IS_ENABLED(CONFIG_RTC_DRV_MACSMC) && has_apple_t2_chip) + caps &= ~ACPI_TAD_RT; + if (!acpi_has_method(handle, "_PRW")) { dev_info(dev, "Missing _PRW\n"); caps &= ~(ACPI_TAD_AC_WAKE | ACPI_TAD_DC_WAKE); diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index fa04ece15..bdb436e24 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include #include @@ -944,6 +945,9 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) .priv = &cmos_rtc, }; + if (IS_ENABLED(CONFIG_RTC_DRV_MACSMC) && has_apple_t2_chip) + return -ENODEV; + /* there can be only one ... */ if (cmos_rtc.dev) return -EBUSY; -- 2.55.0