[PATCH 2/3] pwm: bcm2835: prevent division by zero

[Eric Anholt]

Stefan Wahren <stefan.wahren at i2se.com> writes:

> Am 02.12.2015 um 00:16 schrieb Eric Anholt:
>> Stefan Wahren <stefan.wahren at i2se.com> writes:
>>
>>> It's possible that the pwm clock become an orphan. So better
>>> check the result of clk_get_rate in order to prevent a division
>>> by zero.
>> How would we lose our clock when we're keeping the clock enabled from
>> driver probe until remove?
>
> It's not the problem that we lose the clock inside this driver. The pwm
> clock could be initial assigned to a unregistered parent clock like "GND".
>
> I'm refering to this discussion:
>
> http://lists.infradead.org/pipermail/linux-rpi-kernel/2015-November/002603.html

I actually would have expected that the prepare would error out on a
clock with no rate set.  Interesting.  This seems like a good safety
measure, so this one is also:

Reviewed-by: Eric Anholt <eric at anholt.net>
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