linux-kernel - [tip: timers/clocksource] ACPI: GTDT: Generate platform devices for MMIO timers

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Message-ID: <175883599488.709179.318444978040211978.tip-bot2@tip-bot2>
Date: Thu, 25 Sep 2025 21:33:14 -0000
From: "tip-bot2 for Marc Zyngier" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Marc Zyngier <maz@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 Sudeep Holla <sudeep.holla@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: timers/clocksource] ACPI: GTDT: Generate platform devices for
 MMIO timers

The following commit has been merged into the timers/clocksource branch of tip:

Commit-ID:     5669d92f3efa449c3906cbf15e676768a8f4d502
Gitweb:        https://git.kernel.org/tip/5669d92f3efa449c3906cbf15e676768a8f4d502
Author:        Marc Zyngier <maz@...nel.org>
AuthorDate:    Thu, 14 Aug 2025 16:46:19 +01:00
Committer:     Daniel Lezcano <daniel.lezcano@...aro.org>
CommitterDate: Tue, 23 Sep 2025 12:30:25 +02:00

ACPI: GTDT: Generate platform devices for MMIO timers

In preparation for the MMIO timer support code becoming an actual
driver, mimic what is done for the SBSA watchdog and expose
a synthetic device for each MMIO timer block.

Signed-off-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Tested-by: Sudeep Holla <sudeep.holla@....com>
Reviewed-by: Sudeep Holla <sudeep.holla@....com>
Link: https://lore.kernel.org/r/20250807160243.1970533-2-maz@kernel.org
---
 drivers/acpi/arm64/gtdt.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c
index 70f8290..fd995a1 100644
--- a/drivers/acpi/arm64/gtdt.c
+++ b/drivers/acpi/arm64/gtdt.c
@@ -388,11 +388,11 @@ static int __init gtdt_import_sbsa_gwdt(struct acpi_gtdt_watchdog *wd,
 	return 0;
 }
 
-static int __init gtdt_sbsa_gwdt_init(void)
+static int __init gtdt_platform_timer_init(void)
 {
 	void *platform_timer;
 	struct acpi_table_header *table;
-	int ret, timer_count, gwdt_count = 0;
+	int ret, timer_count, gwdt_count = 0, mmio_timer_count = 0;
 
 	if (acpi_disabled)
 		return 0;
@@ -414,20 +414,41 @@ static int __init gtdt_sbsa_gwdt_init(void)
 		goto out_put_gtdt;
 
 	for_each_platform_timer(platform_timer) {
+		ret = 0;
+
 		if (is_non_secure_watchdog(platform_timer)) {
 			ret = gtdt_import_sbsa_gwdt(platform_timer, gwdt_count);
 			if (ret)
-				break;
+				continue;
 			gwdt_count++;
+		} else 	if (is_timer_block(platform_timer)) {
+			struct arch_timer_mem atm = {};
+			struct platform_device *pdev;
+
+			ret = gtdt_parse_timer_block(platform_timer, &atm);
+			if (ret)
+				continue;
+
+			pdev = platform_device_register_data(NULL, "gtdt-arm-mmio-timer",
+							     gwdt_count, &atm,
+							     sizeof(atm));
+			if (IS_ERR(pdev)) {
+				pr_err("Can't register timer %d\n", gwdt_count);
+				continue;
+			}
+
+			mmio_timer_count++;
 		}
 	}
 
 	if (gwdt_count)
 		pr_info("found %d SBSA generic Watchdog(s).\n", gwdt_count);
+	if (mmio_timer_count)
+		pr_info("found %d Generic MMIO timer(s).\n", mmio_timer_count);
 
 out_put_gtdt:
 	acpi_put_table(table);
 	return ret;
 }
 
-device_initcall(gtdt_sbsa_gwdt_init);
+device_initcall(gtdt_platform_timer_init);