From: Scott Cheloha <cheloha@linux.ibm.com> To: linux-watchdog@vger.kernel.org Cc: linux@roeck-us.net, tzungbi@kernel.org, brking@linux.ibm.com, nathanl@linux.ibm.com, aik@ozlabs.ru, npiggin@gmail.com, vaishnavi@linux.ibm.com, wvoigt@us.ibm.com, linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, Scott Cheloha <cheloha@linux.ibm.com> Subject: [PATCH v3 3/4] powerpc/pseries: register pseries-wdt device with platform bus Date: Wed, 13 Jul 2022 15:23:34 -0500 [thread overview] Message-ID: <20220713202335.1217647-4-cheloha@linux.ibm.com> (raw) In-Reply-To: <20220713202335.1217647-1-cheloha@linux.ibm.com> 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 <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 ee4f1db49515..dd9d3f500cff 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -14,6 +14,7 @@ #include <linux/cpu.h> #include <linux/errno.h> +#include <linux/platform_device.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> @@ -169,6 +170,18 @@ 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); -- 2.27.0
WARNING: multiple messages have this Message-ID (diff)
From: Scott Cheloha <cheloha@linux.ibm.com> To: linux-watchdog@vger.kernel.org Cc: nathanl@linux.ibm.com, wvoigt@us.ibm.com, aik@ozlabs.ru, Scott Cheloha <cheloha@linux.ibm.com>, vaishnavi@linux.ibm.com, npiggin@gmail.com, tzungbi@kernel.org, brking@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, linux@roeck-us.net Subject: [PATCH v3 3/4] powerpc/pseries: register pseries-wdt device with platform bus Date: Wed, 13 Jul 2022 15:23:34 -0500 [thread overview] Message-ID: <20220713202335.1217647-4-cheloha@linux.ibm.com> (raw) In-Reply-To: <20220713202335.1217647-1-cheloha@linux.ibm.com> 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 <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 ee4f1db49515..dd9d3f500cff 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -14,6 +14,7 @@ #include <linux/cpu.h> #include <linux/errno.h> +#include <linux/platform_device.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> @@ -169,6 +170,18 @@ 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); -- 2.27.0
next prev parent reply other threads:[~2022-07-13 20:25 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-07-13 20:23 [PATCH v3 0/4] pseries-wdt: initial support for H_WATCHDOG-based watchdog timers Scott Cheloha 2022-07-13 20:23 ` Scott Cheloha 2022-07-13 20:23 ` [PATCH v3 1/4] powerpc/pseries: hvcall.h: add H_WATCHDOG opcode, H_NOOP return code Scott Cheloha 2022-07-13 20:23 ` Scott Cheloha 2022-07-13 20:23 ` [PATCH v3 2/4] powerpc/pseries: add FW_FEATURE_WATCHDOG flag Scott Cheloha 2022-07-13 20:23 ` Scott Cheloha 2022-07-13 20:23 ` Scott Cheloha [this message] 2022-07-13 20:23 ` [PATCH v3 3/4] powerpc/pseries: register pseries-wdt device with platform bus Scott Cheloha 2022-07-13 20:23 ` [PATCH v3 4/4] watchdog/pseries-wdt: initial support for H_WATCHDOG-based watchdog timers Scott Cheloha 2022-07-13 20:23 ` Scott Cheloha 2022-07-13 20:50 ` Guenter Roeck 2022-07-13 20:50 ` Guenter Roeck 2022-07-25 16:11 ` Scott Cheloha 2022-07-25 16:11 ` Scott Cheloha 2022-07-25 21:30 ` Guenter Roeck 2022-07-25 21:30 ` Guenter Roeck 2022-07-26 7:14 ` Michael Ellerman 2022-07-26 7:14 ` Michael Ellerman 2022-07-29 13:01 ` [PATCH v3 0/4] pseries-wdt: " Michael Ellerman 2022-07-29 13:01 ` Michael Ellerman
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