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
16 static 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
sprd_clk_set_regmap(const struct sprd_clk_desc * desc,struct regmap * regmap)24 static 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
sprd_clk_regmap_init(struct platform_device * pdev,const struct sprd_clk_desc * desc)39 int sprd_clk_regmap_init(struct platform_device *pdev,
40 const struct sprd_clk_desc *desc)
41 {
42 void __iomem *base;
43 struct device *dev = &pdev->dev;
44 struct device_node *node = dev->of_node;
45 struct regmap *regmap;
46
47 if (of_find_property(node, "sprd,syscon", NULL)) {
48 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
49 if (IS_ERR(regmap)) {
50 pr_err("%s: failed to get syscon regmap\n", __func__);
51 return PTR_ERR(regmap);
52 }
53 } else if (of_device_is_compatible(of_get_parent(dev->of_node),
54 "syscon")) {
55 regmap = device_node_to_regmap(of_get_parent(dev->of_node));
56 if (IS_ERR(regmap)) {
57 dev_err(dev, "failed to get regmap from its parent.\n");
58 return PTR_ERR(regmap);
59 }
60 } else {
61 base = devm_platform_ioremap_resource(pdev, 0);
62 if (IS_ERR(base))
63 return PTR_ERR(base);
64
65 regmap = devm_regmap_init_mmio(&pdev->dev, base,
66 &sprdclk_regmap_config);
67 if (IS_ERR(regmap)) {
68 pr_err("failed to init regmap\n");
69 return PTR_ERR(regmap);
70 }
71 }
72
73 sprd_clk_set_regmap(desc, regmap);
74
75 return 0;
76 }
77 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
78
sprd_clk_probe(struct device * dev,struct clk_hw_onecell_data * clkhw)79 int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
80 {
81 int i, ret;
82 struct clk_hw *hw;
83
84 for (i = 0; i < clkhw->num; i++) {
85 const char *name;
86
87 hw = clkhw->hws[i];
88 if (!hw)
89 continue;
90
91 name = hw->init->name;
92 ret = devm_clk_hw_register(dev, hw);
93 if (ret) {
94 dev_err(dev, "Couldn't register clock %d - %s\n",
95 i, name);
96 return ret;
97 }
98 }
99
100 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
101 if (ret)
102 dev_err(dev, "Failed to add clock provider\n");
103
104 return ret;
105 }
106 EXPORT_SYMBOL_GPL(sprd_clk_probe);
107
108 MODULE_LICENSE("GPL v2");
109