1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com>
4  * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
6  * Fixed rate clock implementation
9 #include <linux/clk-provider.h>
18  * DOC: basic fixed-rate clock that cannot gate
21  * prepare - clk_(un)prepare only ensures parents are prepared
22  * enable - clk_enable only ensures parents are enabled
23  * rate - rate is always a fixed value.  No clk_set_rate support
24  * parent - fixed parent.  No clk_set_parent support
32 	return to_clk_fixed_rate(hw)->fixed_rate;  in clk_fixed_rate_recalc_rate()
38 	struct clk_fixed_rate *fixed = to_clk_fixed_rate(hw);  in clk_fixed_rate_recalc_accuracy()  local
40 	if (fixed->flags & CLK_FIXED_RATE_PARENT_ACCURACY)  in clk_fixed_rate_recalc_accuracy()
43 	return fixed->fixed_accuracy;  in clk_fixed_rate_recalc_accuracy()
61 	clk_hw_unregister(&fix->hw);  in devm_clk_hw_register_fixed_rate_release()
71 	struct clk_fixed_rate *fixed;  in __clk_hw_register_fixed_rate()  local
74 	int ret = -EINVAL;  in __clk_hw_register_fixed_rate()
76 	/* allocate fixed-rate clock */  in __clk_hw_register_fixed_rate()
78 		fixed = devres_alloc(devm_clk_hw_register_fixed_rate_release,  in __clk_hw_register_fixed_rate()
79 				     sizeof(*fixed), GFP_KERNEL);  in __clk_hw_register_fixed_rate()
81 		fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);  in __clk_hw_register_fixed_rate()
82 	if (!fixed)  in __clk_hw_register_fixed_rate()
83 		return ERR_PTR(-ENOMEM);  in __clk_hw_register_fixed_rate()
97 	fixed->flags = clk_fixed_flags;  in __clk_hw_register_fixed_rate()
98 	fixed->fixed_rate = fixed_rate;  in __clk_hw_register_fixed_rate()
99 	fixed->fixed_accuracy = fixed_accuracy;  in __clk_hw_register_fixed_rate()
100 	fixed->hw.init = &init;  in __clk_hw_register_fixed_rate()
103 	hw = &fixed->hw;  in __clk_hw_register_fixed_rate()
110 			devres_free(fixed);  in __clk_hw_register_fixed_rate()
112 			kfree(fixed);  in __clk_hw_register_fixed_rate()
115 		devres_add(dev, fixed);  in __clk_hw_register_fixed_rate()
131 	return hw->clk;  in clk_register_fixed_rate()
150 	struct clk_fixed_rate *fixed;  in clk_hw_unregister_fixed_rate()  local
152 	fixed = to_clk_fixed_rate(hw);  in clk_hw_unregister_fixed_rate()
155 	kfree(fixed);  in clk_hw_unregister_fixed_rate()
163 	const char *clk_name = node->name;  in _of_fixed_clk_setup()
164 	u32 rate;  in _of_fixed_clk_setup()  local
168 	if (of_property_read_u32(node, "clock-frequency", &rate))  in _of_fixed_clk_setup()
169 		return ERR_PTR(-EIO);  in _of_fixed_clk_setup()
171 	of_property_read_u32(node, "clock-accuracy", &accuracy);  in _of_fixed_clk_setup()
173 	of_property_read_string(node, "clock-output-names", &clk_name);  in _of_fixed_clk_setup()
176 						    0, rate, accuracy);  in _of_fixed_clk_setup()
190  * of_fixed_clk_setup() - Setup function for simple fixed rate clock
197 CLK_OF_DECLARE(fixed_clk, "fixed-clock", of_fixed_clk_setup);
203 	of_clk_del_provider(pdev->dev.of_node);  in of_fixed_clk_remove()
215 	hw = _of_fixed_clk_setup(pdev->dev.of_node);  in of_fixed_clk_probe()
225 	{ .compatible = "fixed-clock" },