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/platform_device.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 .fast_io = true,
21 };
22
sprd_clk_set_regmap(const struct sprd_clk_desc * desc,struct regmap * regmap)23 static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
24 struct regmap *regmap)
25 {
26 int i;
27 struct sprd_clk_common *cclk;
28
29 for (i = 0; i < desc->num_clk_clks; i++) {
30 cclk = desc->clk_clks[i];
31 if (!cclk)
32 continue;
33
34 cclk->regmap = regmap;
35 }
36 }
37
sprd_clk_regmap_init(struct platform_device * pdev,const struct sprd_clk_desc * desc)38 int sprd_clk_regmap_init(struct platform_device *pdev,
39 const struct sprd_clk_desc *desc)
40 {
41 void __iomem *base;
42 struct device *dev = &pdev->dev;
43 struct device_node *node = dev->of_node, *np;
44 struct regmap *regmap;
45 struct resource *res;
46 struct regmap_config reg_config = sprdclk_regmap_config;
47
48 if (of_property_present(node, "sprd,syscon")) {
49 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
50 if (IS_ERR(regmap)) {
51 pr_err("%s: failed to get syscon regmap\n", __func__);
52 return PTR_ERR(regmap);
53 }
54 } else if (of_device_is_compatible(np = of_get_parent(node), "syscon") ||
55 (of_node_put(np), 0)) {
56 regmap = device_node_to_regmap(np);
57 of_node_put(np);
58 if (IS_ERR(regmap)) {
59 dev_err(dev, "failed to get regmap from its parent.\n");
60 return PTR_ERR(regmap);
61 }
62 } else {
63 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
64 if (IS_ERR(base))
65 return PTR_ERR(base);
66
67 reg_config.max_register = resource_size(res) - reg_config.reg_stride;
68
69 regmap = devm_regmap_init_mmio(&pdev->dev, base,
70 ®_config);
71 if (IS_ERR(regmap)) {
72 pr_err("failed to init regmap\n");
73 return PTR_ERR(regmap);
74 }
75 }
76
77 sprd_clk_set_regmap(desc, regmap);
78
79 return 0;
80 }
81 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
82
sprd_clk_probe(struct device * dev,struct clk_hw_onecell_data * clkhw)83 int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
84 {
85 int i, ret;
86 struct clk_hw *hw;
87
88 for (i = 0; i < clkhw->num; i++) {
89 const char *name;
90
91 hw = clkhw->hws[i];
92 if (!hw)
93 continue;
94
95 name = hw->init->name;
96 ret = devm_clk_hw_register(dev, hw);
97 if (ret) {
98 dev_err(dev, "Couldn't register clock %d - %s\n",
99 i, name);
100 return ret;
101 }
102 }
103
104 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
105 if (ret)
106 dev_err(dev, "Failed to add clock provider\n");
107
108 return ret;
109 }
110 EXPORT_SYMBOL_GPL(sprd_clk_probe);
111
112 MODULE_DESCRIPTION("Spreadtrum clock infrastructure");
113 MODULE_LICENSE("GPL v2");
114