MFC r281073, r281074, r281077, r281200:

Use OF_getencprop over OF_getprop and fdt32_to_cpu. The latter may give
us the wrong data in the failure case if shift was not zero.

Remove the extra copy of uart_fdt_get_clock and uart_fdt_get_shift. While
here also use OF_getencprop in uart_fdt_get_clock.

Move uart_fdt_get_clock and uart_fdt_get_shift to uart_bus_fdt.c, we may
not build uart_cpu_fdt.c in all configs.

Fix uart_fdt_get_clock. It should have been using the cell variable passed
in, not value on the stack.

MFC r279723, r279724:

Define new linker set, UART_FDT_CLASS_AND_DEVICE, for registering full
(class and device) FDT UART. Define second one, UART_FDT_CLASS, for UART
class only.

Move the uart_class definitions and fdt compat data into the individual
uart implementations, and export them using the new linker-set mechanism.

MFC r261083, r261092, r261126, r261127, r261128, r261129, r261130, r261131

Add Atmel serial drivers.

uart clock-frequency is a FreeBSD-specific extention. Make it optional and
allow the client uart drivers to decide if a frequency is required.

Remove redundant declaration for uart devclass.
Commit some unrelated, but harmless, FDT ifdefs.

Add at91 NAND support, Fix comment.

Remove obsolete options and fix comments

MFC r257180, r257195, r257196, r257198, r257209, r257295

Add some extra sanity checking and checks to printf format specifiers.

Try even harder to find a console before giving up.

Make devices with registers into the KVA region work reliably.

Turn on VM_KMEM_SIZE_SCALE on 32-bit as well as 64-bit PowerPC.

Return NOKEY instead of 0 if there are no more key presses queued.

MFC r257111, r257144, r257157, r257183

Test UARTs physical address instead of virtual.

Be a bit more flexible in how we find the console from the properties on
/chosen, following the list of allowed console properties in ePAPR. Also
do not require that stdin be defined and equal to stdout: stdin is
nonstandard (for ePAPR) and console in an unexpected place is after all
better than no console.

MFC r257556:

Arrange for uart_cpu_fdt's probe() routine to use the same table of compat
strings as uart_bus_fdt's probe().

MFC r281073, r281074, r281077, r281200:

Use OF_getencprop over OF_getprop and fdt32_to_cpu. The latter may give
us the wrong data in the failure case if shift was not zero.

Remove the extra copy of uart_fdt_get_clock and uart_fdt_get_shift. While
here also use OF_getencprop in uart_fdt_get_clock.

Move uart_fdt_get_clock and uart_fdt_get_shift to uart_bus_fdt.c, we may
not build uart_cpu_fdt.c in all configs.

Fix uart_fdt_get_clock. It should have been using the cell variable passed
in, not value on the stack.

MFC r279723, r279724:

Define new linker set, UART_FDT_CLASS_AND_DEVICE, for registering full
(class and device) FDT UART. Define second one, UART_FDT_CLASS, for UART
class only.

Move the uart_class definitions and fdt compat data into the individual
uart implementations, and export them using the new linker-set mechanism.

MFC r261083, r261092, r261126, r261127, r261128, r261129, r261130, r261131

Add Atmel serial drivers.

uart clock-frequency is a FreeBSD-specific extention. Make it optional and
allow the client uart drivers to decide if a frequency is required.

Remove redundant declaration for uart devclass.
Commit some unrelated, but harmless, FDT ifdefs.

Add at91 NAND support, Fix comment.

Remove obsolete options and fix comments

MFC r257180, r257195, r257196, r257198, r257209, r257295

Add some extra sanity checking and checks to printf format specifiers.

Try even harder to find a console before giving up.

Make devices with registers into the KVA region work reliably.

Turn on VM_KMEM_SIZE_SCALE on 32-bit as well as 64-bit PowerPC.

Return NOKEY instead of 0 if there are no more key presses queued.

MFC r257111, r257144, r257157, r257183

Test UARTs physical address instead of virtual.

Be a bit more flexible in how we find the console from the properties on
/chosen, following the list of allowed console properties in ePAPR. Also
do not require that stdin be defined and equal to stdout: stdin is
nonstandard (for ePAPR) and console in an unexpected place is after all
better than no console.

MFC r257556:

Arrange for uart_cpu_fdt's probe() routine to use the same table of compat
strings as uart_bus_fdt's probe().