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drivers: pwm: mcux_ftm: allow configuring the clock prescaler

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Allow configuring the clock prescaler divider for the NXP Kinetis
FlexTimer. Setting the prescaler to a lower value allows for much
higher resolution/accuracy for the generated PWM waveforms.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen 2020-05-17 17:13:45 +02:00 • committed by Carles Cufí
commit 784c4728b5
8 changed files with 40 additions and 1 deletions
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4
dts/arm/nxp/nxp_k6x.dtsi
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@ -388,6 +388,7 @@
reg = <0x40038000 0x98>;
interrupts = <42 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_0";
status = "disabled";
};
@ -397,6 +398,7 @@
reg = <0x40039000 0x98>;
interrupts = <43 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_1";
status = "disabled";
};
@ -406,6 +408,7 @@
reg = <0x4003a000 0x98>;
interrupts = <44 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_2";
status = "disabled";
};
@ -415,6 +418,7 @@
reg = <0x400b9000 0x98>;
interrupts = <71 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_3";
status = "disabled";
};