Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2//
3// Spreadtrum clock infrastructure
4//
5// Copyright (C) 2017 Spreadtrum, Inc.
6// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
7
8#include <linux/mfd/syscon.h>
9#include <linux/module.h>
10#include <linux/of_address.h>
11#include <linux/of_platform.h>
12#include <linux/regmap.h>
13
14#include "common.h"
15
16static const struct regmap_config sprdclk_regmap_config = {
17 .reg_bits = 32,
18 .reg_stride = 4,
19 .val_bits = 32,
20 .max_register = 0xffff,
21 .fast_io = true,
22};
23
24static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
25 struct regmap *regmap)
26{
27 int i;
28 struct sprd_clk_common *cclk;
29
30 for (i = 0; i < desc->num_clk_clks; i++) {
31 cclk = desc->clk_clks[i];
32 if (!cclk)
33 continue;
34
35 cclk->regmap = regmap;
36 }
37}
38
39int sprd_clk_regmap_init(struct platform_device *pdev,
40 const struct sprd_clk_desc *desc)
41{
42 void __iomem *base;
43 struct device_node *node = pdev->dev.of_node;
44 struct regmap *regmap;
45
46 if (of_find_property(node, "sprd,syscon", NULL)) {
47 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
48 if (IS_ERR(regmap)) {
49 pr_err("%s: failed to get syscon regmap\n", __func__);
50 return PTR_ERR(regmap);
51 }
52 } else {
53 base = devm_platform_ioremap_resource(pdev, 0);
54 if (IS_ERR(base))
55 return PTR_ERR(base);
56
57 regmap = devm_regmap_init_mmio(&pdev->dev, base,
58 &sprdclk_regmap_config);
59 if (IS_ERR(regmap)) {
60 pr_err("failed to init regmap\n");
61 return PTR_ERR(regmap);
62 }
63 }
64
65 sprd_clk_set_regmap(desc, regmap);
66
67 return 0;
68}
69EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
70
71int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
72{
73 int i, ret;
74 struct clk_hw *hw;
75
76 for (i = 0; i < clkhw->num; i++) {
77 const char *name;
78
79 hw = clkhw->hws[i];
80 if (!hw)
81 continue;
82
83 name = hw->init->name;
84 ret = devm_clk_hw_register(dev, hw);
85 if (ret) {
86 dev_err(dev, "Couldn't register clock %d - %s\n",
87 i, name);
88 return ret;
89 }
90 }
91
92 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
93 if (ret)
94 dev_err(dev, "Failed to add clock provider\n");
95
96 return ret;
97}
98EXPORT_SYMBOL_GPL(sprd_clk_probe);
99
100MODULE_LICENSE("GPL v2");