1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Amlogic Meson-AXG Clock Controller Driver 4 * 5 * Copyright (c) 2016 BayLibre, SAS. 6 * Author: Neil Armstrong <narmstrong@baylibre.com> 7 * 8 * Copyright (c) 2018 Amlogic, inc. 9 * Author: Qiufang Dai <qiufang.dai@amlogic.com> 10 * Author: Yixun Lan <yixun.lan@amlogic.com> 11 */ 12 13 #include <linux/platform_device.h> 14 #include <linux/reset-controller.h> 15 #include <linux/mfd/syscon.h> 16 #include <linux/of.h> 17 #include <linux/module.h> 18 19 #include <linux/slab.h> 20 #include "meson-aoclk.h" 21 22 static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev, 23 unsigned long id) 24 { 25 struct meson_aoclk_reset_controller *rstc = 26 container_of(rcdev, struct meson_aoclk_reset_controller, reset); 27 28 return regmap_write(rstc->regmap, rstc->data->reset_reg, 29 BIT(rstc->data->reset[id])); 30 } 31 32 static const struct reset_control_ops meson_aoclk_reset_ops = { 33 .reset = meson_aoclk_do_reset, 34 }; 35 36 int meson_aoclkc_probe(struct platform_device *pdev) 37 { 38 struct meson_aoclk_reset_controller *rstc; 39 struct meson_aoclk_data *data; 40 struct device *dev = &pdev->dev; 41 struct device_node *np; 42 struct regmap *regmap; 43 int ret, clkid; 44 45 data = (struct meson_aoclk_data *) of_device_get_match_data(dev); 46 if (!data) 47 return -ENODEV; 48 49 rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL); 50 if (!rstc) 51 return -ENOMEM; 52 53 np = of_get_parent(dev->of_node); 54 regmap = syscon_node_to_regmap(np); 55 of_node_put(np); 56 if (IS_ERR(regmap)) { 57 dev_err(dev, "failed to get regmap\n"); 58 return PTR_ERR(regmap); 59 } 60 61 /* Reset Controller */ 62 rstc->data = data; 63 rstc->regmap = regmap; 64 rstc->reset.ops = &meson_aoclk_reset_ops; 65 rstc->reset.nr_resets = data->num_reset; 66 rstc->reset.of_node = dev->of_node; 67 ret = devm_reset_controller_register(dev, &rstc->reset); 68 if (ret) { 69 dev_err(dev, "failed to register reset controller\n"); 70 return ret; 71 } 72 73 /* Populate regmap */ 74 for (clkid = 0; clkid < data->num_clks; clkid++) 75 data->clks[clkid]->map = regmap; 76 77 /* Register all clks */ 78 for (clkid = 0; clkid < data->hw_clks.num; clkid++) { 79 if (!data->hw_clks.hws[clkid]) 80 continue; 81 82 ret = devm_clk_hw_register(dev, data->hw_clks.hws[clkid]); 83 if (ret) { 84 dev_err(dev, "Clock registration failed\n"); 85 return ret; 86 } 87 } 88 89 return devm_of_clk_add_hw_provider(dev, meson_clk_hw_get, (void *)&data->hw_clks); 90 } 91 EXPORT_SYMBOL_NS_GPL(meson_aoclkc_probe, CLK_MESON); 92 93 MODULE_DESCRIPTION("Amlogic Always-ON Clock Controller helpers"); 94 MODULE_LICENSE("GPL"); 95 MODULE_IMPORT_NS(CLK_MESON); 96