2 * Copyright (c) 2014 Lucas Stach <l.stach@pengutronix.de>, Pengutronix
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * http://www.opensource.org/licenses/gpl-license.html
9 * http://www.gnu.org/copyleft/gpl.html
12 #include <linux/clk.h>
13 #include <linux/clk-provider.h>
14 #include <linux/slab.h>
24 static inline struct clk_cpu *to_clk_cpu(struct clk_hw *hw)
26 return container_of(hw, struct clk_cpu, hw);
29 static unsigned long clk_cpu_recalc_rate(struct clk_hw *hw,
30 unsigned long parent_rate)
32 struct clk_cpu *cpu = to_clk_cpu(hw);
34 return clk_get_rate(cpu->div);
37 static long clk_cpu_round_rate(struct clk_hw *hw, unsigned long rate,
40 struct clk_cpu *cpu = to_clk_cpu(hw);
42 return clk_round_rate(cpu->pll, rate);
45 static int clk_cpu_set_rate(struct clk_hw *hw, unsigned long rate,
46 unsigned long parent_rate)
48 struct clk_cpu *cpu = to_clk_cpu(hw);
51 /* switch to PLL bypass clock */
52 ret = clk_set_parent(cpu->mux, cpu->step);
57 ret = clk_set_rate(cpu->pll, rate);
59 clk_set_parent(cpu->mux, cpu->pll);
62 /* switch back to PLL clock */
63 clk_set_parent(cpu->mux, cpu->pll);
65 /* Ensure the divider is what we expect */
66 clk_set_rate(cpu->div, rate);
71 static const struct clk_ops clk_cpu_ops = {
72 .recalc_rate = clk_cpu_recalc_rate,
73 .round_rate = clk_cpu_round_rate,
74 .set_rate = clk_cpu_set_rate,
77 struct clk *imx_clk_cpu(const char *name, const char *parent_name,
78 struct clk *div, struct clk *mux, struct clk *pll,
83 struct clk_init_data init;
85 cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
87 return ERR_PTR(-ENOMEM);
95 init.ops = &clk_cpu_ops;
97 init.parent_names = &parent_name;
100 cpu->hw.init = &init;
102 clk = clk_register(NULL, &cpu->hw);