// SPDX-License-Identifier: GPL-2.0 /* * Analog Devices AXI PWM generator * * Copyright 2024 Analog Devices Inc. * Copyright 2024 Baylibre SAS * * Device docs: https://analogdevicesinc.github.io/hdl/library/axi_pwm_gen/index.html * * Limitations: * - The writes to registers for period and duty are shadowed until * LOAD_CONFIG is written to AXI_PWMGEN_REG_CONFIG, at which point * they take effect. * - Writing LOAD_CONFIG also has the effect of re-synchronizing all * enabled channels, which could cause glitching on other channels. It * is therefore expected that channels are assigned harmonic periods * and all have a single user coordinating this. * - Supports normal polarity. Does not support changing polarity. * - On disable, the PWM output becomes low (inactive). */ #include <linux/bits.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/fpga/adi-axi-common.h> #include <linux/io.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/regmap.h> #include <linux/slab.h> #define AXI_PWMGEN_REG_CORE_VERSION … #define AXI_PWMGEN_REG_ID … #define AXI_PWMGEN_REG_SCRATCHPAD … #define AXI_PWMGEN_REG_CORE_MAGIC … #define AXI_PWMGEN_REG_CONFIG … #define AXI_PWMGEN_REG_NPWM … #define AXI_PWMGEN_CHX_PERIOD(ch) … #define AXI_PWMGEN_CHX_DUTY(ch) … #define AXI_PWMGEN_CHX_OFFSET(ch) … #define AXI_PWMGEN_REG_CORE_MAGIC_VAL … #define AXI_PWMGEN_LOAD_CONFIG … #define AXI_PWMGEN_REG_CONFIG_RESET … struct axi_pwmgen_ddata { … }; static const struct regmap_config axi_pwmgen_regmap_config = …; static int axi_pwmgen_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static int axi_pwmgen_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { … } static const struct pwm_ops axi_pwmgen_pwm_ops = …; static int axi_pwmgen_setup(struct regmap *regmap, struct device *dev) { … } static int axi_pwmgen_probe(struct platform_device *pdev) { … } static const struct of_device_id axi_pwmgen_ids[] = …; MODULE_DEVICE_TABLE(of, axi_pwmgen_ids); static struct platform_driver axi_pwmgen_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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