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 #include "clk-regmap.h" 22 23 static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev, 24 unsigned long id) 25 { 26 struct meson_aoclk_reset_controller *rstc = 27 container_of(rcdev, struct meson_aoclk_reset_controller, reset); 28 29 return regmap_write(rstc->regmap, rstc->data->reset_reg, 30 BIT(rstc->data->reset[id])); 31 } 32 33 static const struct reset_control_ops meson_aoclk_reset_ops = { 34 .reset = meson_aoclk_do_reset, 35 }; 36 37 int meson_aoclkc_probe(struct platform_device *pdev) 38 { 39 struct meson_aoclk_reset_controller *rstc; 40 const struct meson_clkc_data *clkc_data; 41 const struct meson_aoclk_data *data; 42 struct device *dev = &pdev->dev; 43 struct device_node *np; 44 struct regmap *regmap; 45 int ret; 46 47 clkc_data = of_device_get_match_data(dev); 48 if (!clkc_data) 49 return -EINVAL; 50 51 ret = meson_clkc_syscon_probe(pdev); 52 if (ret) 53 return ret; 54 55 data = container_of(clkc_data, struct meson_aoclk_data, 56 clkc_data); 57 58 rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL); 59 if (!rstc) 60 return -ENOMEM; 61 62 np = of_get_parent(dev->of_node); 63 regmap = syscon_node_to_regmap(np); 64 of_node_put(np); 65 if (IS_ERR(regmap)) { 66 dev_err(dev, "failed to get regmap\n"); 67 return PTR_ERR(regmap); 68 } 69 70 /* Reset Controller */ 71 rstc->data = data; 72 rstc->regmap = regmap; 73 rstc->reset.ops = &meson_aoclk_reset_ops; 74 rstc->reset.nr_resets = data->num_reset; 75 rstc->reset.of_node = dev->of_node; 76 ret = devm_reset_controller_register(dev, &rstc->reset); 77 if (ret) { 78 dev_err(dev, "failed to register reset controller\n"); 79 return ret; 80 } 81 82 return 0; 83 } 84 EXPORT_SYMBOL_NS_GPL(meson_aoclkc_probe, "CLK_MESON"); 85 86 MODULE_DESCRIPTION("Amlogic Always-ON Clock Controller helpers"); 87 MODULE_LICENSE("GPL"); 88 MODULE_IMPORT_NS("CLK_MESON"); 89