1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
// SPDX-License-Identifier: GPL-2.0
//
// Spreadtrum clock infrastructure
//
// Copyright (C) 2017 Spreadtrum, Inc.
// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include "common.h"
static const struct regmap_config sprdclk_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = 0xffff,
.fast_io = true,
};
static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
struct regmap *regmap)
{
int i;
struct sprd_clk_common *cclk;
for (i = 0; i < desc->num_clk_clks; i++) {
cclk = desc->clk_clks[i];
if (!cclk)
continue;
cclk->regmap = regmap;
}
}
int sprd_clk_regmap_init(struct platform_device *pdev,
const struct sprd_clk_desc *desc)
{
void __iomem *base;
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
struct regmap *regmap;
if (of_find_property(node, "sprd,syscon", NULL)) {
regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
if (IS_ERR(regmap)) {
pr_err("%s: failed to get syscon regmap\n", __func__);
return PTR_ERR(regmap);
}
} else if (of_device_is_compatible(of_get_parent(dev->of_node),
"syscon")) {
regmap = device_node_to_regmap(of_get_parent(dev->of_node));
if (IS_ERR(regmap)) {
dev_err(dev, "failed to get regmap from its parent.\n");
return PTR_ERR(regmap);
}
} else {
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
regmap = devm_regmap_init_mmio(&pdev->dev, base,
&sprdclk_regmap_config);
if (IS_ERR(regmap)) {
pr_err("failed to init regmap\n");
return PTR_ERR(regmap);
}
}
sprd_clk_set_regmap(desc, regmap);
return 0;
}
EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
{
int i, ret;
struct clk_hw *hw;
for (i = 0; i < clkhw->num; i++) {
const char *name;
hw = clkhw->hws[i];
if (!hw)
continue;
name = hw->init->name;
ret = devm_clk_hw_register(dev, hw);
if (ret) {
dev_err(dev, "Couldn't register clock %d - %s\n",
i, name);
return ret;
}
}
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
if (ret)
dev_err(dev, "Failed to add clock provider\n");
return ret;
}
EXPORT_SYMBOL_GPL(sprd_clk_probe);
MODULE_LICENSE("GPL v2");
|
