// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for Silicon Labs Si514 Programmable Oscillator * * Copyright (C) 2015 Topic Embedded Products * * Author: Mike Looijmans <[email protected]> */ #include <linux/clk-provider.h> #include <linux/delay.h> #include <linux/module.h> #include <linux/i2c.h> #include <linux/regmap.h> #include <linux/slab.h> /* I2C registers */ #define SI514_REG_LP … #define SI514_REG_M_FRAC1 … #define SI514_REG_M_FRAC2 … #define SI514_REG_M_FRAC3 … #define SI514_REG_M_INT_FRAC … #define SI514_REG_M_INT … #define SI514_REG_HS_DIV … #define SI514_REG_LS_HS_DIV … #define SI514_REG_OE_STATE … #define SI514_REG_RESET … #define SI514_REG_CONTROL … /* Register values */ #define SI514_RESET_RST … #define SI514_CONTROL_FCAL … #define SI514_CONTROL_OE … #define SI514_MIN_FREQ … #define SI514_MAX_FREQ … #define FXO … #define FVCO_MIN … #define FVCO_MAX … #define HS_DIV_MAX … struct clk_si514 { … }; #define to_clk_si514(_hw) … /* Multiplier/divider settings */ struct clk_si514_muldiv { … }; /* Enables or disables the output driver */ static int si514_enable_output(struct clk_si514 *data, bool enable) { … } static int si514_prepare(struct clk_hw *hw) { … } static void si514_unprepare(struct clk_hw *hw) { … } static int si514_is_prepared(struct clk_hw *hw) { … } /* Retrieve clock multiplier and dividers from hardware */ static int si514_get_muldiv(struct clk_si514 *data, struct clk_si514_muldiv *settings) { … } static int si514_set_muldiv(struct clk_si514 *data, struct clk_si514_muldiv *settings) { … } /* Calculate divider settings for a given frequency */ static int si514_calc_muldiv(struct clk_si514_muldiv *settings, unsigned long frequency) { … } /* Calculate resulting frequency given the register settings */ static unsigned long si514_calc_rate(struct clk_si514_muldiv *settings) { … } static unsigned long si514_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { … } static long si514_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *parent_rate) { … } /* * Update output frequency for big frequency changes (> 1000 ppm). * The chip supports <1000ppm changes "on the fly", we haven't implemented * that here. */ static int si514_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { … } static const struct clk_ops si514_clk_ops = …; static bool si514_regmap_is_volatile(struct device *dev, unsigned int reg) { … } static bool si514_regmap_is_writeable(struct device *dev, unsigned int reg) { … } static const struct regmap_config si514_regmap_config = …; static int si514_probe(struct i2c_client *client) { … } static const struct i2c_device_id si514_id[] = …; MODULE_DEVICE_TABLE(i2c, si514_id); static const struct of_device_id clk_si514_of_match[] = …; MODULE_DEVICE_TABLE(of, clk_si514_of_match); static struct i2c_driver si514_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux