1 // SPDX-License-Identifier: GPL-2.0
3 // Spreadtrum clock infrastructure
5 // Copyright (C) 2017 Spreadtrum, Inc.
6 // Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
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>
16 static const struct regmap_config sprdclk_regmap_config = {
23 static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
24 struct regmap *regmap)
27 struct sprd_clk_common *cclk;
29 for (i = 0; i < desc->num_clk_clks; i++) {
30 cclk = desc->clk_clks[i];
34 cclk->regmap = regmap;
38 int sprd_clk_regmap_init(struct platform_device *pdev,
39 const struct sprd_clk_desc *desc)
42 struct device *dev = &pdev->dev;
43 struct device_node *node = dev->of_node, *np;
44 struct regmap *regmap;
46 struct regmap_config reg_config = sprdclk_regmap_config;
48 if (of_property_present(node, "sprd,syscon")) {
49 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
51 pr_err("%s: failed to get syscon regmap\n", __func__);
52 return PTR_ERR(regmap);
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);
59 dev_err(dev, "failed to get regmap from its parent.\n");
60 return PTR_ERR(regmap);
63 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
67 reg_config.max_register = resource_size(res) - reg_config.reg_stride;
69 regmap = devm_regmap_init_mmio(&pdev->dev, base,
72 pr_err("failed to init regmap\n");
73 return PTR_ERR(regmap);
77 sprd_clk_set_regmap(desc, regmap);
81 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
83 int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
88 for (i = 0; i < clkhw->num; i++) {
95 name = hw->init->name;
96 ret = devm_clk_hw_register(dev, hw);
98 dev_err(dev, "Couldn't register clock %d - %s\n",
104 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
106 dev_err(dev, "Failed to add clock provider\n");
110 EXPORT_SYMBOL_GPL(sprd_clk_probe);
112 MODULE_LICENSE("GPL v2");