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ACPI: GTDT: Generate platform devices for MMIO timers

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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@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20250807160243.1970533-2-maz@kernel.org
This commit is contained in:
Marc Zyngier
2025-08-14 16:46:19 +01:00
committed by Daniel Lezcano
parent bee33f22d7
commit 5669d92f3e
1 changed files with 25 additions and 4 deletions
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29
drivers/acpi/arm64/gtdt.c
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@@ -388,11 +388,11 @@ static int __init gtdt_import_sbsa_gwdt(struct acpi_gtdt_watchdog *wd,
return 0; return 0;
} }
static int __init gtdt_sbsa_gwdt_init(void) static int __init gtdt_platform_timer_init(void)
{ {
void *platform_timer; void *platform_timer;
struct acpi_table_header *table; 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) if (acpi_disabled)
return 0; return 0;
@@ -414,20 +414,41 @@ static int __init gtdt_sbsa_gwdt_init(void)
goto out_put_gtdt; goto out_put_gtdt;
for_each_platform_timer(platform_timer) { for_each_platform_timer(platform_timer) {
ret = 0;
if (is_non_secure_watchdog(platform_timer)) { if (is_non_secure_watchdog(platform_timer)) {
ret = gtdt_import_sbsa_gwdt(platform_timer, gwdt_count); ret = gtdt_import_sbsa_gwdt(platform_timer, gwdt_count);
if (ret) if (ret)
break; continue;
gwdt_count++; 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) if (gwdt_count)
pr_info("found %d SBSA generic Watchdog(s).\n", 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: out_put_gtdt:
acpi_put_table(table); acpi_put_table(table);
return ret; return ret;
} }
device_initcall(gtdt_sbsa_gwdt_init); device_initcall(gtdt_platform_timer_init);