clk: ti: Use CPU ticks to count timeout

readl_relaxed_poll_timeout() relies on timers. On the beaglebone black,
the timer used by readl_relaxed_poll_timeout() depends on this clock
driver. So we have a sort of circular dependency [enable_clock ->
timer_init -> enable_clock -> timer_init]. It leads to a
division-per-zero during the second timer_init() and the beaglebone
fails to boot with following message:
| CPU  : AM335X-GP rev 2.1
| Model: TI AM335x BeagleBone Black
| DRAM:  512 MiB
| ### ERROR ### Please RESET the board ###

Replace readl_relaxed_poll_timeout() with a simple loop that uses CPU
ticks to countdown the timeout. This loop and the value of LDELAY are
inspired from what's done in arch/arm/mach-omap2/am33xx/clock.c
Also, arch/arm/mach-omap2/am33xx/clock.c doesn't return an error on
timeout, it only logs it, so let's stick with it.

Fixes: de2e3f00f2fa ("clk: ti: Remove AM33xx dependency")
Signed-off-by: Bastien Curutchet <[email protected]>
Reported-by: Tom Rini <[email protected]>
Tested-by: Tom Rini <[email protected]>

0 files changed, 0 insertions, 0 deletions