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, Scott Cheloha <cheloha@linux.ibm.com> Subject: [PATCH v1 3/4] powerpc/pseries: register pseries-wdt device with platform bus Date: Fri, 20 May 2022 12:20:54 -0500 [thread overview] Message-ID: <20220520172055.32220-3-cheloha@linux.ibm.com> (raw) In-Reply-To: <20220520172055.32220-1-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 | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index 955ff8aa1644..6e8b67ea2a33 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 +170,22 @@ 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 struct platform_device *pseries_wdt_pdev; + +static __init int pseries_wdt_init(void) +{ + if (!firmware_has_feature(FW_FEATURE_WATCHDOG)) + return 0; + pseries_wdt_pdev = 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 v1 3/4] powerpc/pseries: register pseries-wdt device with platform bus Date: Fri, 20 May 2022 12:20:54 -0500 [thread overview] Message-ID: <20220520172055.32220-3-cheloha@linux.ibm.com> (raw) In-Reply-To: <20220520172055.32220-1-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 | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index 955ff8aa1644..6e8b67ea2a33 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 +170,22 @@ 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 struct platform_device *pseries_wdt_pdev; + +static __init int pseries_wdt_init(void) +{ + if (!firmware_has_feature(FW_FEATURE_WATCHDOG)) + return 0; + pseries_wdt_pdev = 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:[~2022-05-20 17:21 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-20 17:20 [PATCH v1 1/4] powerpc/pseries: hvcall.h: add H_WATCHDOG opcode, H_NOOP return code Scott Cheloha 2022-05-20 17:20 ` Scott Cheloha 2022-05-20 17:20 ` [PATCH v1 2/4] powerpc/pseries: add FW_FEATURE_WATCHDOG flag Scott Cheloha 2022-05-20 17:20 ` Scott Cheloha 2022-05-20 17:20 ` Scott Cheloha [this message] 2022-05-20 17:20 ` [PATCH v1 3/4] powerpc/pseries: register pseries-wdt device with platform bus Scott Cheloha 2022-05-20 17:20 ` [PATCH v1 4/4] watchdog/pseries-wdt: initial support for PAPR H_WATCHDOG timers Scott Cheloha 2022-05-20 17:20 ` Scott Cheloha 2022-05-20 17:44 ` [PATCH v1 1/4] powerpc/pseries: hvcall.h: add H_WATCHDOG opcode, H_NOOP return code Guenter Roeck 2022-05-20 17:44 ` Guenter Roeck 2022-05-20 18:35 [PATCH v1 0/4] pseries-wdt: initial support for PAPR virtual watchdog timers Scott Cheloha 2022-05-20 18:35 ` [PATCH v1 3/4] powerpc/pseries: register pseries-wdt device with platform bus Scott Cheloha 2022-05-20 18:35 ` Scott Cheloha
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20220520172055.32220-3-cheloha@linux.ibm.com \ --to=cheloha@linux.ibm.com \ --cc=aik@ozlabs.ru \ --cc=brking@linux.ibm.com \ --cc=linux-watchdog@vger.kernel.org \ --cc=linux@roeck-us.net \ --cc=linuxppc-dev@lists.ozlabs.org \ --cc=nathanl@linux.ibm.com \ --cc=npiggin@gmail.com \ --cc=tzungbi@kernel.org \ --cc=vaishnavi@linux.ibm.com \ --cc=wvoigt@us.ibm.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.