diff options
Diffstat (limited to 'drivers/virtio/Kconfig')
| -rw-r--r-- | drivers/virtio/Kconfig | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index 2eb747311bfd..6db5235a7693 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -188,4 +188,68 @@ config VIRTIO_DEBUG If unsure, say N. +config VIRTIO_RTC + tristate "Virtio RTC driver" + depends on VIRTIO + depends on PTP_1588_CLOCK_OPTIONAL + help + This driver provides current time from a Virtio RTC device. The driver + provides the time through one or more clocks. The Virtio RTC PTP + clocks and/or the Real Time Clock driver for Virtio RTC must be + enabled to expose the clocks to userspace. + + To compile this code as a module, choose M here: the module will be + called virtio_rtc. + + If unsure, say M. + +if VIRTIO_RTC + +comment "WARNING: Consider enabling VIRTIO_RTC_PTP and/or VIRTIO_RTC_CLASS." + depends on !VIRTIO_RTC_PTP && !VIRTIO_RTC_CLASS + +comment "Enable PTP_1588_CLOCK in order to enable VIRTIO_RTC_PTP." + depends on PTP_1588_CLOCK=n + +config VIRTIO_RTC_PTP + bool "Virtio RTC PTP clocks" + default y + depends on PTP_1588_CLOCK + help + This exposes any Virtio RTC clocks as PTP Hardware Clocks (PHCs) to + userspace. The PHC sysfs attribute "clock_name" describes the clock + type. + + If unsure, say Y. + +config VIRTIO_RTC_ARM + bool "Virtio RTC cross-timestamping using Arm Generic Timer" + default y + depends on VIRTIO_RTC_PTP && ARM_ARCH_TIMER + help + This enables Virtio RTC cross-timestamping using the Arm Generic Timer. + It only has an effect if the Virtio RTC device also supports this. The + cross-timestamp is available through the PTP clock driver precise + cross-timestamp ioctl (PTP_SYS_OFFSET_PRECISE2 aka + PTP_SYS_OFFSET_PRECISE). + + If unsure, say Y. + +comment "Enable RTC_CLASS in order to enable VIRTIO_RTC_CLASS." + depends on RTC_CLASS=n + +config VIRTIO_RTC_CLASS + bool "Real Time Clock driver for Virtio RTC" + default y + depends on RTC_CLASS + help + This exposes the Virtio RTC UTC-like clock as a Linux Real Time Clock. + It only has an effect if the Virtio RTC device has a UTC-like clock + which smears leap seconds to avoid steps. The Real Time Clock is + read-only, and may support setting an alarm. + + If unsure, say Y. + +endif # VIRTIO_RTC + endif # VIRTIO_MENU |