This series adds RTC device to QEMU RISC-V virt machine. We have
selected Goldfish RTC device model for this. It's a pretty simple
synthetic device with few MMIO registers and no dependency external
clock. The driver for Goldfish RTC is already available in Linux so
we just need to enable it in Kconfig for RISCV and also update Linux
defconfigs.

We have tested this series with Linux-5.4-rc1 plus defconfig changes
available in 'goldfish_rtc_v2' branch of:
https://github.com/avpatel/linux.git

Changes since v2:
 - Rebased patches on recent RTC refactoring by Philippe Mathieu-Daud??
   (Refer, https://patchew.org/QEMU/20191003230404.19384-1-philmd@redhat.com/)

Changes since v1:
 - Implemented VMState save/restore for Goldfish RTC

Anup Patel (2):
  hw: timer: Add Goldfish RTC device
  riscv: virt: Use Goldfish RTC device

 hw/riscv/Kconfig                |   1 +
 hw/riscv/virt.c                 |  15 ++
 hw/rtc/Kconfig                  |   3 +
 hw/rtc/Makefile.objs            |   1 +
 hw/rtc/goldfish_rtc.c           | 278 ++++++++++++++++++++++++++++++++
 include/hw/riscv/virt.h         |   2 +
 include/hw/timer/goldfish_rtc.h |  46 ++++++
 7 files changed, 346 insertions(+)
 create mode 100644 hw/rtc/goldfish_rtc.c
 create mode 100644 include/hw/timer/goldfish_rtc.h

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2.17.1