2  * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com>
3  * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
9  * Fixed rate clock implementation
12 #include <linux/clk-provider.h>
21  * DOC: basic fixed-rate clock that cannot gate
23  * Traits of this clock:
24  * prepare - clk_(un)prepare only ensures parents are prepared
25  * enable - clk_enable only ensures parents are enabled
26  * rate - rate is always a fixed value.  No clk_set_rate support
27  * parent - fixed parent.  No clk_set_parent support
33 	return to_clk_fixed_rate(hw)->fixed_rate;  in clk_fixed_rate_recalc_rate()
39 	return to_clk_fixed_rate(hw)->fixed_accuracy;  in clk_fixed_rate_recalc_accuracy()
49  * clk_hw_register_fixed_rate_with_accuracy - register fixed-rate clock with
50  * the clock framework
51  * @dev: device that is registering this clock
52  * @name: name of this clock
53  * @parent_name: name of clock's parent
54  * @flags: framework-specific flags
55  * @fixed_rate: non-adjustable clock rate
56  * @fixed_accuracy: non-adjustable clock rate
62 	struct clk_fixed_rate *fixed;  in clk_hw_register_fixed_rate_with_accuracy()  local
67 	/* allocate fixed-rate clock */  in clk_hw_register_fixed_rate_with_accuracy()
68 	fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);  in clk_hw_register_fixed_rate_with_accuracy()
69 	if (!fixed)  in clk_hw_register_fixed_rate_with_accuracy()
70 		return ERR_PTR(-ENOMEM);  in clk_hw_register_fixed_rate_with_accuracy()
79 	fixed->fixed_rate = fixed_rate;  in clk_hw_register_fixed_rate_with_accuracy()
80 	fixed->fixed_accuracy = fixed_accuracy;  in clk_hw_register_fixed_rate_with_accuracy()
81 	fixed->hw.init = &init;  in clk_hw_register_fixed_rate_with_accuracy()
83 	/* register the clock */  in clk_hw_register_fixed_rate_with_accuracy()
84 	hw = &fixed->hw;  in clk_hw_register_fixed_rate_with_accuracy()
87 		kfree(fixed);  in clk_hw_register_fixed_rate_with_accuracy()
105 	return hw->clk;  in clk_register_fixed_rate_with_accuracy()
110  * clk_hw_register_fixed_rate - register fixed-rate clock with the clock
112  * @dev: device that is registering this clock
113  * @name: name of this clock
114  * @parent_name: name of clock's parent
115  * @flags: framework-specific flags
116  * @fixed_rate: non-adjustable clock rate
151 	struct clk_fixed_rate *fixed;  in clk_hw_unregister_fixed_rate()  local
153 	fixed = to_clk_fixed_rate(hw);  in clk_hw_unregister_fixed_rate()
156 	kfree(fixed);  in clk_hw_unregister_fixed_rate()
164 	const char *clk_name = node->name;  in _of_fixed_clk_setup()
169 	if (of_property_read_u32(node, "clock-frequency", &rate))  in _of_fixed_clk_setup()
170 		return ERR_PTR(-EIO);  in _of_fixed_clk_setup()
172 	of_property_read_u32(node, "clock-accuracy", &accuracy);  in _of_fixed_clk_setup()
174 	of_property_read_string(node, "clock-output-names", &clk_name);  in _of_fixed_clk_setup()
191  * 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()
217 	clk = _of_fixed_clk_setup(pdev->dev.of_node);  in of_fixed_clk_probe()
227 	{ .compatible = "fixed-clock" },