This driver is an OF driver, it depends on OF, and uses
TIMER_OF_DECLARE, so it should select CONFIG_TIMER_OF.

Without CONFIG_TIMER_OF enabled this can lead to warnings such as:

  powerpc-linux-ld: warning: orphan section `__timer_of_table' from
  `drivers/clocksource/timer-microchip-pit64b.o' being placed in
  section `__timer_of_table'.

Because TIMER_OF_TABLES in vmlinux.lds.h doesn't emit anything into
the linker script when CONFIG_TIMER_OF is not enabled.

Fixes: 625022a5f160 ("clocksource/drivers/timer-microchip-pit64b: Add Microchip 
PIT64B support")
Cc: sta...@vger.kernel.org # v5.6+
Reported-by: kbuild test robot <l...@intel.com>
Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
---
 drivers/clocksource/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index f2142e6bbea3..f225c27b70f7 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -709,6 +709,7 @@ config MICROCHIP_PIT64B
        bool "Microchip PIT64B support"
        depends on OF || COMPILE_TEST
        select CLKSRC_MMIO
+       select TIMER_OF
        help
          This option enables Microchip PIT64B timer for Atmel
          based system. It supports the oneshot, the periodic
-- 
2.25.1

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