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 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 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 *dev = &pdev->dev; 44 struct device_node *node = dev->of_node, *np; 45 struct regmap *regmap; 46 47 if (of_find_property(node, "sprd,syscon", NULL)) { 48 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon"); 49 if (IS_ERR(regmap)) { 50 pr_err("%s: failed to get syscon regmap\n", __func__); 51 return PTR_ERR(regmap); 52 } 53 } else if (of_device_is_compatible(np = of_get_parent(node), "syscon") || 54 (of_node_put(np), 0)) { 55 regmap = device_node_to_regmap(np); 56 of_node_put(np); 57 if (IS_ERR(regmap)) { 58 dev_err(dev, "failed to get regmap from its parent.\n"); 59 return PTR_ERR(regmap); 60 } 61 } else { 62 base = devm_platform_ioremap_resource(pdev, 0); 63 if (IS_ERR(base)) 64 return PTR_ERR(base); 65 66 regmap = devm_regmap_init_mmio(&pdev->dev, base, 67 &sprdclk_regmap_config); 68 if (IS_ERR(regmap)) { 69 pr_err("failed to init regmap\n"); 70 return PTR_ERR(regmap); 71 } 72 } 73 74 sprd_clk_set_regmap(desc, regmap); 75 76 return 0; 77 } 78 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init); 79 80 int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw) 81 { 82 int i, ret; 83 struct clk_hw *hw; 84 85 for (i = 0; i < clkhw->num; i++) { 86 const char *name; 87 88 hw = clkhw->hws[i]; 89 if (!hw) 90 continue; 91 92 name = hw->init->name; 93 ret = devm_clk_hw_register(dev, hw); 94 if (ret) { 95 dev_err(dev, "Couldn't register clock %d - %s\n", 96 i, name); 97 return ret; 98 } 99 } 100 101 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw); 102 if (ret) 103 dev_err(dev, "Failed to add clock provider\n"); 104 105 return ret; 106 } 107 EXPORT_SYMBOL_GPL(sprd_clk_probe); 108 109 MODULE_LICENSE("GPL v2"); 110