Add support for newer SoCs that store the data as number of days since the
Unix epoch instead of a calender date.

ok jca@

Convert more drivers to use todr_attach(). The quality of the RTC is
set such that "discrete" RTC chips are preferred over RTCs integrated on
a SoC.

ok deraadt@, miod@

Extend struct todr_chip_handle with a todr_quality member. This allows us
to assign a quality to RTC implementation and pick the "best" RTC if a
system has multiple RTCs (or multiple interfaces to an RTC). This allows
us to prefer a battery-backed I2C RTC over an RTC that is part of the SoC
which is only running of the SoC is powered. It also allows us to
work around issues with firmware RTC interfaces that may lie to us or
even crash the system.

This change makes sure the todr_quality member of the struct is always
initialized. In most cases the quality will be set to zero; further
adjustments of the quality for specific subsystems/architectures will follow.

ok cheloha@, patrick@

Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

Remove unused function pointers from `todr_handle'.

from miod@

Add clock support to sxirtc(4); needed by newer Linux DTs.

ok patrick@

Adapt to allwinner device tree changes in linux >= 5.0-rc1
"allwinner,sun6i-a31-rtc" has been removed from h3/h5/r40/a64

ok kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@

Convert more drivers to use todr_attach(). The quality of the RTC is
set such that "discrete" RTC chips are preferred over RTCs integrated on
a SoC.

ok deraadt@, miod@

Extend struct todr_chip_handle with a todr_quality member. This allows us
to assign a quality to RTC implementation and pick the "best" RTC if a
system has multiple RTCs (or multiple interfaces to an RTC). This allows
us to prefer a battery-backed I2C RTC over an RTC that is part of the SoC
which is only running of the SoC is powered. It also allows us to
work around issues with firmware RTC interfaces that may lie to us or
even crash the system.

This change makes sure the todr_quality member of the struct is always
initialized. In most cases the quality will be set to zero; further
adjustments of the quality for specific subsystems/architectures will follow.

ok cheloha@, patrick@

Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

Remove unused function pointers from `todr_handle'.

from miod@

Add clock support to sxirtc(4); needed by newer Linux DTs.

ok patrick@

Adapt to allwinner device tree changes in linux >= 5.0-rc1
"allwinner,sun6i-a31-rtc" has been removed from h3/h5/r40/a64

ok kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@

Extend struct todr_chip_handle with a todr_quality member. This allows us
to assign a quality to RTC implementation and pick the "best" RTC if a
system has multiple RTCs (or multiple interfaces to an RTC). This allows
us to prefer a battery-backed I2C RTC over an RTC that is part of the SoC
which is only running of the SoC is powered. It also allows us to
work around issues with firmware RTC interfaces that may lie to us or
even crash the system.

This change makes sure the todr_quality member of the struct is always
initialized. In most cases the quality will be set to zero; further
adjustments of the quality for specific subsystems/architectures will follow.

ok cheloha@, patrick@

Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

Remove unused function pointers from `todr_handle'.

from miod@

Add clock support to sxirtc(4); needed by newer Linux DTs.

ok patrick@

Adapt to allwinner device tree changes in linux >= 5.0-rc1
"allwinner,sun6i-a31-rtc" has been removed from h3/h5/r40/a64

ok kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@

Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

Remove unused function pointers from `todr_handle'.

from miod@

Add clock support to sxirtc(4); needed by newer Linux DTs.

ok patrick@

Adapt to allwinner device tree changes in linux >= 5.0-rc1
"allwinner,sun6i-a31-rtc" has been removed from h3/h5/r40/a64

ok kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@

Remove unused function pointers from `todr_handle'.

from miod@

Add clock support to sxirtc(4); needed by newer Linux DTs.

ok patrick@

Adapt to allwinner device tree changes in linux >= 5.0-rc1
"allwinner,sun6i-a31-rtc" has been removed from h3/h5/r40/a64

ok kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@

Add clock support to sxirtc(4); needed by newer Linux DTs.

ok patrick@

Adapt to allwinner device tree changes in linux >= 5.0-rc1
"allwinner,sun6i-a31-rtc" has been removed from h3/h5/r40/a64

ok kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@

Adapt to allwinner device tree changes in linux >= 5.0-rc1
"allwinner,sun6i-a31-rtc" has been removed from h3/h5/r40/a64

ok kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@

Reject times in the first year that can be represented by the clock to catch
RTC clocks that aren't battery powered.

ok deraadt@, millert@, visa@, tom@

Move Allwinner drivers that will soon be used by OpenBSD/arm64
to the new MI FDT driver directory.

"go ahead" kettenis@