1/*
2 * Copyright (C) 2014 Chen-Yu Tsai
3 * Author: Chen-Yu Tsai <wens@csie.org>
4 *
5 * Allwinner A23 APB0 clock driver
6 *
7 * License Terms: GNU General Public License v2
8 *
9 * Based on clk-sun6i-apb0.c
10 * Allwinner A31 APB0 clock driver
11 *
12 * Copyright (C) 2014 Free Electrons
13 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
14 *
15 */
16
17#include <linux/clk-provider.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21
22static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev)
23{
24	struct device_node *np = pdev->dev.of_node;
25	const char *clk_name = np->name;
26	const char *clk_parent;
27	struct resource *r;
28	void __iomem *reg;
29	struct clk *clk;
30
31	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
32	reg = devm_ioremap_resource(&pdev->dev, r);
33	if (IS_ERR(reg))
34		return PTR_ERR(reg);
35
36	clk_parent = of_clk_get_parent_name(np, 0);
37	if (!clk_parent)
38		return -EINVAL;
39
40	of_property_read_string(np, "clock-output-names", &clk_name);
41
42	/* The A23 APB0 clock is a standard 2 bit wide divider clock */
43	clk = clk_register_divider(&pdev->dev, clk_name, clk_parent, 0, reg,
44				   0, 2, CLK_DIVIDER_POWER_OF_TWO, NULL);
45	if (IS_ERR(clk))
46		return PTR_ERR(clk);
47
48	return of_clk_add_provider(np, of_clk_src_simple_get, clk);
49}
50
51static const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = {
52	{ .compatible = "allwinner,sun8i-a23-apb0-clk" },
53	{ /* sentinel */ }
54};
55
56static struct platform_driver sun8i_a23_apb0_clk_driver = {
57	.driver = {
58		.name = "sun8i-a23-apb0-clk",
59		.of_match_table = sun8i_a23_apb0_clk_dt_ids,
60	},
61	.probe = sun8i_a23_apb0_clk_probe,
62};
63module_platform_driver(sun8i_a23_apb0_clk_driver);
64
65MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
66MODULE_DESCRIPTION("Allwinner A23 APB0 clock Driver");
67MODULE_LICENSE("GPL v2");
68