ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<ukleinek>
geertu: you only have usages in mind where a shorter period for a PWM is bad? :-)
<geertu>
ukleinek: Usually overclocking leads to bad results
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<geertu>
For e.g. I2C and SPI, the requested rate (should) never be exceeded
<ukleinek>
geertu: unless for the exceptions that is always the case :-)
<ukleinek>
Something watchdog like where you need a raising edge every 10ms is an example from the other side.
<ukleinek>
or a fan that must have a minimal rotation speed to yield enough cooling
<geertu>
ukleinek: While overclocking the fan might overheat it to destruction?
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<ukleinek>
geertu: ¯\_(ツ)_/¯
<ukleinek>
geertu: at least the rounding direction is fixed. This is a nice upside compared to clk_set_rate().
<robmur01>
How does one overclock a fan? The limit as PWM period tends towards zero is just DC, surely :)
<ukleinek>
Note that for clk_set_rate rounding down isn't always the right thing either. For spi and i2c indeed you want round down, for an UART you want something near.
<ukleinek>
geertu: bonus question: If you want a UART clock at rate R, but you can have only 0.8 R or 1.22 R, which one is better? Is it 0.8 R because abs(1 - 0.8) < abs(1 - 1.22)? Or is it 1.22 R because 1 / 1.22 > 0.8?
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<cambrian_invader>
(bonus answer: it's 1.22, since differences in baud time between the sender/receiver are what introduce bit errors when the reciever samples too close to an edge)
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<geertu>
ukleinek: It's been ages I did these calculations. drivers/tty/serial/sh-sci.c knows ;-)
<geertu>
1.22 R is best
<geertu>
But it still won't work, as the deviation is too large.
<geertu>
Unless you have only 2 databits ;)
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