From 578030bfe117060bf86c81aaa7b3faead4589810 Mon Sep 17 00:00:00 2001 From: Scott Cheloha Date: Wed, 13 Jul 2022 15:23:34 -0500 Subject: [PATCH] powerpc/pseries: register pseries-wdt device with platform bus PAPR v2.12 defines a new hypercall, H_WATCHDOG. The hypercall permits guest control of one or more virtual watchdog timers. These timers do not conform to PowerPC device conventions. They are not affixed to any extant bus, nor do they have full representation in the device tree. As a workaround we represent them as platform devices. This patch registers a single platform device, "pseries-wdt", with the platform bus if the FW_FEATURE_WATCHDOG flag is set. A driver for this device, "pseries-wdt", will be introduced in a subsequent patch. Signed-off-by: Scott Cheloha Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220713202335.1217647-4-cheloha@linux.ibm.com --- arch/powerpc/platforms/pseries/setup.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index a74c425..489f4c4 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -14,6 +14,7 @@ #include #include +#include #include #include #include @@ -170,6 +171,18 @@ static void __init fwnmi_init(void) #endif } +/* + * Affix a device for the first timer to the platform bus if + * we have firmware support for the H_WATCHDOG hypercall. + */ +static __init int pseries_wdt_init(void) +{ + if (firmware_has_feature(FW_FEATURE_WATCHDOG)) + platform_device_register_simple("pseries-wdt", 0, NULL, 0); + return 0; +} +machine_subsys_initcall(pseries, pseries_wdt_init); + static void pseries_8259_cascade(struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); -- 2.7.4