1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright 2013 Emilio López
 4 *
 5 * Emilio López <emilio@elopez.com.ar>
 6 */
 7
 8#include <linux/clk-provider.h>
 9#include <linux/of.h>
10#include <linux/of_address.h>
11#include <linux/slab.h>
12
13#define SUNXI_OSC24M_GATE	0
14
15static DEFINE_SPINLOCK(hosc_lock);
16
17static void __init sun4i_osc_clk_setup(struct device_node *node)
18{
19	struct clk *clk;
20	struct clk_fixed_rate *fixed;
21	struct clk_gate *gate;
22	const char *clk_name = node->name;
23	u32 rate;
24
25	if (of_property_read_u32(node, "clock-frequency", &rate))
26		return;
27
28	/* allocate fixed-rate and gate clock structs */
29	fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);
30	if (!fixed)
31		return;
32	gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
33	if (!gate)
34		goto err_free_fixed;
35
36	of_property_read_string(node, "clock-output-names", &clk_name);
37
38	/* set up gate and fixed rate properties */
39	gate->reg = of_iomap(node, 0);
40	gate->bit_idx = SUNXI_OSC24M_GATE;
41	gate->lock = &hosc_lock;
42	fixed->fixed_rate = rate;
43
44	clk = clk_register_composite(NULL, clk_name,
45			NULL, 0,
46			NULL, NULL,
47			&fixed->hw, &clk_fixed_rate_ops,
48			&gate->hw, &clk_gate_ops, 0);
49
50	if (IS_ERR(clk))
51		goto err_free_gate;
52
53	of_clk_add_provider(node, of_clk_src_simple_get, clk);
54
55	return;
56
57err_free_gate:
58	kfree(gate);
59err_free_fixed:
60	kfree(fixed);
61}
62CLK_OF_DECLARE(sun4i_osc, "allwinner,sun4i-a10-osc-clk", sun4i_osc_clk_setup);