tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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 struct resource *res;
46
47 if (of_find_property(node, "sprd,syscon", NULL)) {
48 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
49 if (IS_ERR_OR_NULL(regmap)) {
50 pr_err("%s: failed to get syscon regmap\n", __func__);
51 return PTR_ERR(regmap);
52 }
53 } else {
54 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
55 base = devm_ioremap_resource(&pdev->dev, res);
56 if (IS_ERR(base))
57 return PTR_ERR(base);
58
59 regmap = devm_regmap_init_mmio(&pdev->dev, base,
60 &sprdclk_regmap_config);
61 if (IS_ERR(regmap)) {
62 pr_err("failed to init regmap\n");
63 return PTR_ERR(regmap);
64 }
65 }
66
67 sprd_clk_set_regmap(desc, regmap);
68
69 return 0;
70}
71EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
72
73int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
74{
75 int i, ret;
76 struct clk_hw *hw;
77
78 for (i = 0; i < clkhw->num; i++) {
79 const char *name;
80
81 hw = clkhw->hws[i];
82 if (!hw)
83 continue;
84
85 name = hw->init->name;
86 ret = devm_clk_hw_register(dev, hw);
87 if (ret) {
88 dev_err(dev, "Couldn't register clock %d - %s\n",
89 i, name);
90 return ret;
91 }
92 }
93
94 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
95 if (ret)
96 dev_err(dev, "Failed to add clock provider\n");
97
98 return ret;
99}
100EXPORT_SYMBOL_GPL(sprd_clk_probe);
101
102MODULE_LICENSE("GPL v2");