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_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 = of_iomap(node, 0);
54 		regmap = devm_regmap_init_mmio(&pdev->dev, base,
55 					       &sprdclk_regmap_config);
56 		if (IS_ERR_OR_NULL(regmap)) {
57 			pr_err("failed to init regmap\n");
58 			return PTR_ERR(regmap);
59 		}
60 	}
61 
62 	sprd_clk_set_regmap(desc, regmap);
63 
64 	return 0;
65 }
66 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
67 
sprd_clk_probe(struct device * dev,struct clk_hw_onecell_data * clkhw)68 int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
69 {
70 	int i, ret;
71 	struct clk_hw *hw;
72 
73 	for (i = 0; i < clkhw->num; i++) {
74 		const char *name;
75 
76 		hw = clkhw->hws[i];
77 		if (!hw)
78 			continue;
79 
80 		name = hw->init->name;
81 		ret = devm_clk_hw_register(dev, hw);
82 		if (ret) {
83 			dev_err(dev, "Couldn't register clock %d - %s\n",
84 				i, name);
85 			return ret;
86 		}
87 	}
88 
89 	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
90 	if (ret)
91 		dev_err(dev, "Failed to add clock provider\n");
92 
93 	return ret;
94 }
95 EXPORT_SYMBOL_GPL(sprd_clk_probe);
96 
97 MODULE_LICENSE("GPL v2");
98