// SPDX-License-Identifier: GPL-2.0-only /* * Toshiba Visconti pulse-width-modulation controller driver * * Copyright (c) 2020 - 2021 TOSHIBA CORPORATION * Copyright (c) 2020 - 2021 Toshiba Electronic Devices & Storage Corporation * * Authors: Nobuhiro Iwamatsu <[email protected]> * * Limitations: * - The fixed input clock is running at 1 MHz and is divided by either 1, * 2, 4 or 8. * - When the settings of the PWM are modified, the new values are shadowed * in hardware until the PIPGM_PCSR register is written and the currently * running period is completed. This way the hardware switches atomically * from the old setting to the new. * - Disabling the hardware completes the currently running period and keeps * the output at low level at all times. */ #include <linux/err.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pwm.h> #define PIPGM_PCSR(ch) … #define PIPGM_PDUT(ch) … #define PIPGM_PWMC(ch) … #define PIPGM_PWMC_PWMACT … #define PIPGM_PWMC_CLK_MASK … #define PIPGM_PWMC_POLARITY_MASK … struct visconti_pwm_chip { … }; static inline struct visconti_pwm_chip *visconti_pwm_from_chip(struct pwm_chip *chip) { … } static int visconti_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static int visconti_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { … } static const struct pwm_ops visconti_pwm_ops = …; static int visconti_pwm_probe(struct platform_device *pdev) { … } static const struct of_device_id visconti_pwm_of_match[] = …; MODULE_DEVICE_TABLE(of, visconti_pwm_of_match); static struct platform_driver visconti_pwm_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_ALIAS(…) …;
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