[RFC PATCH 09/14] treewide: disable other rtc's in t2 macs

[Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>]

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 <atharvatiwarilinuxdev@gmail.com>
---
 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 <linux/ktime.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/platform_data/x86/apple.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/rtc.h>
@@ -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 <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
+#include <linux/platform_data/x86/apple.h>
 #include <linux/platform_device.h>
 #include <linux/log2.h>
 #include <linux/pm.h>
@@ -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