owl-common.c

 1// SPDX-License-Identifier: GPL-2.0+
 2//
 3// OWL common clock driver
 4//
 5// Copyright (c) 2014 Actions Semi Inc.
 6// Author: David Liu <liuwei@actions-semi.com>
 7//
 8// Copyright (c) 2018 Linaro Ltd.
 9// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
10
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13
14#include "owl-common.h"
15
16static const struct regmap_config owl_regmap_config = {
17	.reg_bits	= 32,
18	.reg_stride	= 4,
19	.val_bits	= 32,
20	.max_register	= 0x00cc,
21};
22
23static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
24			 struct regmap *regmap)
25{
26	int i;
27	struct owl_clk_common *clks;
28
29	for (i = 0; i < desc->num_clks; i++) {
30		clks = desc->clks[i];
31		if (!clks)
32			continue;
33
34		clks->regmap = regmap;
35	}
36}
37
38int owl_clk_regmap_init(struct platform_device *pdev,
39			struct owl_clk_desc *desc)
40{
41	void __iomem *base;
42	struct regmap *regmap;
43
44	base = devm_platform_ioremap_resource(pdev, 0);
45	if (IS_ERR(base))
46		return PTR_ERR(base);
47
48	regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
49	if (IS_ERR(regmap)) {
50		pr_err("failed to init regmap\n");
51		return PTR_ERR(regmap);
52	}
53
54	owl_clk_set_regmap(desc, regmap);
55	desc->regmap = regmap;
56
57	return 0;
58}
59
60int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
61{
62	int i, ret;
63	struct clk_hw *hw;
64
65	for (i = 0; i < hw_clks->num; i++) {
66		const char *name;
67
68		hw = hw_clks->hws[i];
69		if (IS_ERR_OR_NULL(hw))
70			continue;
71
72		name = hw->init->name;
73		ret = devm_clk_hw_register(dev, hw);
74		if (ret) {
75			dev_err(dev, "Couldn't register clock %d - %s\n",
76				i, name);
77			return ret;
78		}
79	}
80
81	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
82	if (ret)
83		dev_err(dev, "Failed to add clock provider\n");
84
85	return ret;
86}