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drivers: pwm: pwm driver
Add pwm driver for ENE KB106X Signed-off-by: Steven Chang <[email protected]>
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‎drivers/pwm/CMakeLists.txt

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@@ -50,6 +50,7 @@ zephyr_library_sources_ifdef(CONFIG_PWM_MSPM0 pwm_mspm0.c)
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zephyr_library_sources_ifdef(CONFIG_PWM_NUMAKER pwm_numaker.c)
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zephyr_library_sources_ifdef(CONFIG_PWM_NXP_FLEXIO pwm_nxp_flexio.c)
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zephyr_library_sources_ifdef(CONFIG_PWM_NXP_S32_EMIOS pwm_nxp_s32_emios.c)
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zephyr_library_sources_ifdef(CONFIG_PWM_ENE_KB106X pwm_ene_kb106x.c)
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zephyr_library_sources_ifdef(CONFIG_PWM_ENE_KB1200 pwm_ene_kb1200.c)
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zephyr_library_sources_ifdef(CONFIG_PWM_RENESAS_RA pwm_renesas_ra.c)
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zephyr_library_sources_ifdef(CONFIG_PWM_RENESAS_RX_MTU pwm_renesas_rx_mtu.c)

‎drivers/pwm/Kconfig.ene

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@@ -8,3 +8,11 @@ config PWM_ENE_KB1200
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select PINCTRL
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help
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This option enables the PWM driver for KB1200 processors.
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config PWM_ENE_KB106X
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bool "ENE KB106X PWM driver"
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default y
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depends on DT_HAS_ENE_KB106X_PWM_ENABLED
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select PINCTRL
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help
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This option enables the PWM driver for KB106X processors.

‎drivers/pwm/pwm_ene_kb106x.c

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/*
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* Copyright (c) 2025 ENE Technology Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT ene_kb106x_pwm
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/pwm.h>
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#include <zephyr/drivers/pinctrl.h>
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#include <reg/pwm.h>
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/* Device config */
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struct pwm_kb106x_config {
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/* pwm controller base address */
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struct pwm_regs *pwm;
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const struct pinctrl_dev_config *pcfg;
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};
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/* Driver data */
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struct pwm_kb106x_data {
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/* PWM cycles per second */
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uint32_t cycles_per_sec;
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};
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/* PWM api functions */
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static int pwm_kb106x_set_cycles(const struct device *dev, uint32_t channel, uint32_t period_cycles,
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uint32_t pulse_cycles, pwm_flags_t flags)
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{
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/* Single channel for each pwm device */
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ARG_UNUSED(channel);
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const struct pwm_kb106x_config *config = dev->config;
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int prescaler;
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uint32_t high_len;
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uint32_t cycle_len;
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/*
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* Calculate PWM prescaler that let period_cycles map to
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* maximum pwm period cycles and won't exceed it.
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* Then prescaler = ceil (period_cycles / pwm_max_period_cycles)
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*/
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prescaler = DIV_ROUND_UP(period_cycles, PWM_MAX_CYCLES);
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if (prescaler > PWM_MAX_PRESCALER) {
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return -EINVAL;
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}
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high_len = (pulse_cycles / prescaler);
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cycle_len = (period_cycles / prescaler);
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/* Select PWM inverted polarity (ie. active-low pulse). */
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if (flags & PWM_POLARITY_INVERTED) {
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high_len = cycle_len - high_len;
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}
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/* Set PWM prescaler. */
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config->pwm->PWMCFG = (config->pwm->PWMCFG & ~GENMASK(13, 8)) | ((prescaler - 1) << 8);
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/*
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* period_cycles: PWM Cycle Length
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* pulse_cycles : PWM High Length
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*/
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config->pwm->PWMHIGH = high_len;
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config->pwm->PWMCYC = cycle_len;
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/* Start pwm */
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config->pwm->PWMCFG |= PWM_ENABLE;
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return 0;
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}
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static int pwm_kb106x_get_cycles_per_sec(const struct device *dev, uint32_t channel,
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uint64_t *cycles)
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{
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/* Single channel for each pwm device */
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ARG_UNUSED(channel);
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ARG_UNUSED(dev);
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if (cycles) {
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/* User does not have to know about lowest clock,
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* the driver will select the most relevant one.
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*/
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*cycles = PWM_INPUT_FREQ_HI; /*32Mhz*/
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}
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return 0;
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}
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static DEVICE_API(pwm, pwm_kb106x_driver_api) = {
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.set_cycles = pwm_kb106x_set_cycles,
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.get_cycles_per_sec = pwm_kb106x_get_cycles_per_sec,
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};
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static int pwm_kb106x_init(const struct device *dev)
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{
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int ret;
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const struct pwm_kb106x_config *config = dev->config;
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ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
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if (ret != 0) {
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return ret;
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}
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config->pwm->PWMCFG = PWM_SOURCE_CLK_32M | PWM_RULE1 | PWM_PUSHPULL;
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return 0;
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}
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#define KB106X_PWM_INIT(inst) \
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PINCTRL_DT_INST_DEFINE(inst); \
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static const struct pwm_kb106x_config pwm_kb106x_cfg_##inst = { \
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.pwm = (struct pwm_regs *)DT_INST_REG_ADDR(inst), \
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.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(inst), \
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}; \
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static struct pwm_kb106x_data pwm_kb106x_data_##inst; \
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DEVICE_DT_INST_DEFINE(inst, &pwm_kb106x_init, NULL, &pwm_kb106x_data_##inst, \
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&pwm_kb106x_cfg_##inst, PRE_KERNEL_1, CONFIG_PWM_INIT_PRIORITY, \
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&pwm_kb106x_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(KB106X_PWM_INIT)

‎dts/arm/ene/kb106x/kb1064.dtsi

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@@ -5,3 +5,101 @@
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*/
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#include <arm/ene/kb106x/kb106x.dtsi>
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&soc {
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pwm4: pwm@40210040 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210040 0x10>;
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pwm-channel = <4>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm5: pwm@40210050 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210050 0x10>;
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pwm-channel = <5>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm6: pwm@40210060 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210060 0x10>;
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pwm-channel = <6>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm7: pwm@40210070 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210070 0x10>;
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pwm-channel = <7>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm8: pwm@40210080 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210080 0x10>;
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pwm-channel = <8>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm9: pwm@40210090 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210090 0x10>;
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pwm-channel = <9>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm10: pwm@402100a0 {
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compatible = "ene,kb106x-pwm";
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reg = <0x402100A0 0x10>;
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pwm-channel = <10>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm11: pwm@402100b0 {
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compatible = "ene,kb106x-pwm";
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reg = <0x402100B0 0x10>;
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pwm-channel = <11>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm12: pwm@402100c0 {
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compatible = "ene,kb106x-pwm";
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reg = <0x402100C0 0x10>;
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pwm-channel = <12>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm13: pwm@402100d0 {
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compatible = "ene,kb106x-pwm";
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reg = <0x402100D0 0x10>;
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pwm-channel = <13>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm14: pwm@402100e0 {
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compatible = "ene,kb106x-pwm";
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reg = <0x402100E0 0x10>;
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pwm-channel = <14>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm15: pwm@402100f0 {
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compatible = "ene,kb106x-pwm";
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reg = <0x402100F0 0x10>;
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pwm-channel = <15>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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};

‎dts/arm/ene/kb106x/kb106x.dtsi

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status = "disabled";
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#io-channel-cells = <1>;
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};
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pwm0: pwm@40210000 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210000 0x10>;
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pwm-channel = <0>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm1: pwm@40210010 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210010 0x10>;
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pwm-channel = <1>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm2: pwm@40210020 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210020 0x10>;
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pwm-channel = <2>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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pwm3: pwm@40210030 {
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compatible = "ene,kb106x-pwm";
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reg = <0x40210030 0x10>;
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pwm-channel = <3>;
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#pwm-cells = <3>;
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status = "disabled";
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};
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};
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};
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‎dts/bindings/pwm/ene,kb106x-pwm.yaml

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# Copyright (c) 2025 ENE Technology Inc.
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# SPDX-License-Identifier: Apache-2.0
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description: ENE, Pulse Width Modulator (PWM) node
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compatible: "ene,kb106x-pwm"
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include: [pwm-controller.yaml, base.yaml, pinctrl-device.yaml]
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properties:
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reg:
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required: true
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pwm-channel:
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type: int
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description: |
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A index to indicate PWM module that generates a single PWM signal.
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Please don't overwrite it in the board-level DT driver.
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pinctrl-0:
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required: true
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pinctrl-names:
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required: true
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pwm-cells:
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- channel
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- period
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- flags

‎soc/ene/kb106x/common/reg/pwm.h

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/*
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* Copyright (c) 2025 ENE Technology Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ENE_KB106X_PWM_H
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#define ENE_KB106X_PWM_H
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/**
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* Structure type to access Pulse Width Modulation (PWM).
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*/
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struct pwm_regs {
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volatile uint16_t PWMCFG; /*Configuration Register */
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volatile uint16_t Reserved0; /*Reserved */
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volatile uint16_t PWMHIGH; /*High Length Register */
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volatile uint16_t Reserved1; /*Reserved */
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volatile uint16_t PWMCYC; /*Cycle Length Register */
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volatile uint16_t Reserved2; /*Reserved */
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volatile uint32_t PWMCHC; /*Current High/Cycle Length Register */
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};
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#define PWM_SOURCE_CLK_32M 0x0000
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#define PWM_SOURCE_CLK_1M 0x4000
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#define PWM_SOURCE_CLK_32_768K 0x8000
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#define PWM_PRESCALER_BIT_S 8
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#define PWM_RULE0 0x0000
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#define PWM_RULE1 0x0080
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#define PWM_PUSHPULL 0x0000
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#define PWM_OPENDRAIN 0x0002
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#define PWM_ENABLE 0x0001
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#define PWM_INPUT_FREQ_HI 32000000u
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#define PWM_MAX_PRESCALER (1UL << (6))
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#define PWM_MAX_CYCLES (1UL << (14))
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#endif /* ENE_KB106X_PWM_H */

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