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_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 } 71 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init); 72 73 int 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 } 100 EXPORT_SYMBOL_GPL(sprd_clk_probe); 101 102 MODULE_LICENSE("GPL v2"); 103