1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // OWL common clock driver 4 // 5 // Copyright (c) 2014 Actions Semi Inc. 6 // Author: David Liu <liuwei@actions-semi.com> 7 // 8 // Copyright (c) 2018 Linaro Ltd. 9 // Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> 10 11 #include <linux/platform_device.h> 12 #include <linux/regmap.h> 13 14 #include "owl-common.h" 15 16 static const struct regmap_config owl_regmap_config = { 17 .reg_bits = 32, 18 .reg_stride = 4, 19 .val_bits = 32, 20 .max_register = 0x00cc, 21 }; 22 23 static void owl_clk_set_regmap(const struct owl_clk_desc *desc, 24 struct regmap *regmap) 25 { 26 int i; 27 struct owl_clk_common *clks; 28 29 for (i = 0; i < desc->num_clks; i++) { 30 clks = desc->clks[i]; 31 if (!clks) 32 continue; 33 34 clks->regmap = regmap; 35 } 36 } 37 38 int owl_clk_regmap_init(struct platform_device *pdev, 39 struct owl_clk_desc *desc) 40 { 41 void __iomem *base; 42 struct regmap *regmap; 43 44 base = devm_platform_ioremap_resource(pdev, 0); 45 if (IS_ERR(base)) 46 return PTR_ERR(base); 47 48 regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config); 49 if (IS_ERR(regmap)) { 50 pr_err("failed to init regmap\n"); 51 return PTR_ERR(regmap); 52 } 53 54 owl_clk_set_regmap(desc, regmap); 55 desc->regmap = regmap; 56 57 return 0; 58 } 59 60 int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks) 61 { 62 int i, ret; 63 struct clk_hw *hw; 64 65 for (i = 0; i < hw_clks->num; i++) { 66 const char *name; 67 68 hw = hw_clks->hws[i]; 69 if (IS_ERR_OR_NULL(hw)) 70 continue; 71 72 name = hw->init->name; 73 ret = devm_clk_hw_register(dev, hw); 74 if (ret) { 75 dev_err(dev, "Couldn't register clock %d - %s\n", 76 i, name); 77 return ret; 78 } 79 } 80 81 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks); 82 if (ret) 83 dev_err(dev, "Failed to add clock provider\n"); 84 85 return ret; 86 } 87