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Backport axi-pwmgen driver #2602

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Backport axi-pwmgen driver #2602

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Commits on Sep 30, 2024

  1. iio: adc: ad4134: Make use of devm_clk_get_enabled() 

    The driver's probe function had an open-coded variant of
devm_clk_get_enabled(). Replace it by the actual function with the same
semantics.

Signed-off-by: Uwe Kleine-König <[email protected]>
    Uwe Kleine-König committed Sep 30, 2024
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  2. iio: adc: ad_pulsar: Implement more exact period calculation 

    With knowing the input clock of the PWM hardware unit, the optimal period
can be calculated such that the sample frequency is configured as the
highest possible value not bigger than the requested value. Do that with
some commentary that explains the calculation.

Note that currently the initial claim about the axi-pwmgen driver's
implemented period isn't true. But it's true for the mainline driver and
soon for the driver in this tree as well.

Signed-off-by: Uwe Kleine-König <[email protected]>
    Uwe Kleine-König committed Sep 30, 2024
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  3. iio: adc: ltc2387: Implement more exact period calculation 

    With knowing the input clock of the PWM hardware unit, the optimal period
can be calculated such that the sample frequency is configured as the
highest possible value not bigger than the requested value. Do that with
some commentary that explains the calculation.

Note that currently the initial claim about the axi-pwmgen driver's
implemented period isn't true. But it's true for the mainline driver and
soon for the driver in this tree as well.

Signed-off-by: Uwe Kleine-König <[email protected]>
    Uwe Kleine-König committed Sep 30, 2024
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  4. pwm: Replace axi-pwmgen driver by a backport of the mainline driver 

    Backporting involved several changes. These were marked using some cpp
magic to simplify updates to newer kernel version and for documentation
purposes.

The relevant semantical changes are:

 - The apply callback uses round down now to match the policy upstream.

 - The compatible string changed. All devicetrees are updated
   accordingly.

 - The v1 hardware revision isn't supported any more.
   The v1 documentation isn't in the public documentations any more, so
   this is expected to be ok.

Signed-off-by: Uwe Kleine-König <[email protected]>
    Uwe Kleine-König committed Sep 30, 2024
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