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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
drivers/pwm/pwm_mcux_ftm.c
View file

@ -153,6 +153,8 @@ static const struct pwm_driver_api mcux_ftm_driver_api = {
.get_cycles_per_sec = mcux_ftm_get_cycles_per_sec,
};
#define TO_FTM_PRESCALE_DIVIDE(val) _DO_CONCAT(kFTM_Prescale_Divide_, val)
#define FTM_DEVICE(n) \
static const struct mcux_ftm_config mcux_ftm_config_##n = { \
.base = (FTM_Type *)DT_INST_REG_ADDR(n),\
@ -160,7 +162,7 @@ static const struct pwm_driver_api mcux_ftm_driver_api = {
.clock_subsys = (clock_control_subsys_t) \
DT_INST_CLOCKS_CELL(n, name), \
.ftm_clock_source = kFTM_FixedClock, \
.prescale = kFTM_Prescale_Divide_16, \
.prescale = TO_FTM_PRESCALE_DIVIDE(DT_INST_PROP(n, prescaler)),\
.channel_count = FSL_FEATURE_FTM_CHANNEL_COUNTn((FTM_Type *) \
DT_INST_REG_ADDR(n)), \
.mode = kFTM_EdgeAlignedPwm, \

4
dts/arm/nxp/nxp_k2x.dtsi
View file

@ -308,6 +308,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x40038000 0x98>;
interrupts = <42 0>;
prescaler = <16>;
label = "FTM_0";
status = "disabled";
};
@ -316,6 +317,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x40039000 0x98>;
interrupts = <43 0>;
prescaler = <16>;
label = "FTM_1";
status = "disabled";
};
@ -324,6 +326,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x4003a000 0x98>;
interrupts = <44 0>;
prescaler = <16>;
label = "FTM_2";
status = "disabled";
};
@ -332,6 +335,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x400b9000 0x98>;
interrupts = <71 0>;
prescaler = <16>;
label = "FTM_3";
status = "disabled";
};

4
dts/arm/nxp/nxp_k6x.dtsi
View file

@ -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";
};

4
dts/arm/nxp/nxp_k8x.dtsi
View file

@ -279,6 +279,7 @@
reg = <0x40038000 0x1000>;
interrupts = <42 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_0";
status = "disabled";
};
@ -288,6 +289,7 @@
reg = <0x40039000 0x1000>;
interrupts = <43 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_1";
status = "disabled";
};
@ -297,6 +299,7 @@
reg = <0x4003a000 0x1000>;
interrupts = <44 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_2";
status = "disabled";
};
@ -306,6 +309,7 @@
reg = <0x400b9000 0x1000>;
interrupts = <71 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_3";
status = "disabled";
};

4
dts/arm/nxp/nxp_ke1xf.dtsi
View file

@ -416,6 +416,7 @@
reg = <0x40038000 0x1000>;
interrupts = <42 0>;
clocks = <&pcc 0xe0 KINETIS_PCC_SRC_FIRC_ASYNC>;
prescaler = <16>;
label = "FTM_0";
status = "disabled";
};
@ -425,6 +426,7 @@
reg = <0x40039000 0x1000>;
interrupts = <43 0>;
clocks = <&pcc 0xe4 KINETIS_PCC_SRC_FIRC_ASYNC>;
prescaler = <16>;
label = "FTM_1";
status = "disabled";
};
@ -434,6 +436,7 @@
reg = <0x4003a000 0x1000>;
interrupts = <44 0>;
clocks = <&pcc 0xe8 KINETIS_PCC_SRC_FIRC_ASYNC>;
prescaler = <16>;
label = "FTM_2";
status = "disabled";
};
@ -443,6 +446,7 @@
reg = <0x40026000 0x1000>;
interrupts = <71 0>;
clocks = <&pcc 0x98 KINETIS_PCC_SRC_FIRC_ASYNC>;
prescaler = <16>;
label = "FTM_3";
status = "disabled";
};

4
dts/arm/nxp/nxp_kv5x.dtsi
View file

@ -203,6 +203,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x40038000 0x1000>;
interrupts = <42 0>;
prescaler = <16>;
label = "FTM_0";
status = "disabled";
};
@ -211,6 +212,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x40039000 0x1000>;
interrupts = <43 0>;
prescaler = <16>;
label = "FTM_1";
status = "disabled";
};
@ -219,6 +221,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x4003a000 0x1000>;
interrupts = <53 0>;
prescaler = <16>;
label = "FTM_2";
status = "disabled";
};
@ -227,6 +230,7 @@
compatible = "nxp,kinetis-ftm";
reg = <0x40026000 0x1000>;
interrupts = <71 0>;
prescaler = <16>;
label = "FTM_3";
status = "disabled";
};

3
dts/arm/nxp/nxp_kw2xd.dtsi
View file

@ -282,6 +282,7 @@
reg = <0x40038000 0x98>;
interrupts = <42 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_0";
status = "disabled";
};
@ -291,6 +292,7 @@
reg = <0x40039000 0x98>;
interrupts = <43 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_1";
status = "disabled";
};
@ -300,6 +302,7 @@
reg = <0x4003a000 0x98>;
interrupts = <44 0>;
clocks = <&mcg KINETIS_MCG_FIXED_FREQ_CLK>;
prescaler = <16>;
label = "FTM_2";
status = "disabled";
};

14
dts/bindings/arm/nxp,kinetis-ftm.yaml
View file

@ -13,3 +13,17 @@ properties:
interrupts:
required: true
prescaler:
type: int
required: true
enum:
- 1
- 2
- 4
- 8
- 16
- 32
- 64
- 128
description: Input clock prescaler