Commit 5669d92f authored by Marc Zyngier's avatar Marc Zyngier Committed by Daniel Lezcano
Browse files

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: default avatarMarc Zyngier <maz@kernel.org>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Reviewed-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20250807160243.1970533-2-maz@kernel.org
parent bee33f22

drivers/acpi/arm64/gtdt.c

+25 −4
Original line number Diff line number Diff line
@@ -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);