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_device.h> 17 #include <linux/slab.h> 18 #include "meson-aoclk.h" 19 20 static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev, 21 unsigned long id) 22 { 23 struct meson_aoclk_reset_controller *rstc = 24 container_of(rcdev, struct meson_aoclk_reset_controller, reset); 25 26 return regmap_write(rstc->regmap, rstc->data->reset_reg, 27 BIT(rstc->data->reset[id])); 28 } 29 30 static const struct reset_control_ops meson_aoclk_reset_ops = { 31 .reset = meson_aoclk_do_reset, 32 }; 33 34 int meson_aoclkc_probe(struct platform_device *pdev) 35 { 36 struct meson_aoclk_reset_controller *rstc; 37 struct meson_aoclk_data *data; 38 struct device *dev = &pdev->dev; 39 struct regmap *regmap; 40 int ret, clkid; 41 42 data = (struct meson_aoclk_data *) of_device_get_match_data(dev); 43 if (!data) 44 return -ENODEV; 45 46 rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL); 47 if (!rstc) 48 return -ENOMEM; 49 50 regmap = syscon_node_to_regmap(of_get_parent(dev->of_node)); 51 if (IS_ERR(regmap)) { 52 dev_err(dev, "failed to get regmap\n"); 53 return PTR_ERR(regmap); 54 } 55 56 /* Reset Controller */ 57 rstc->data = data; 58 rstc->regmap = regmap; 59 rstc->reset.ops = &meson_aoclk_reset_ops; 60 rstc->reset.nr_resets = data->num_reset, 61 rstc->reset.of_node = dev->of_node; 62 ret = devm_reset_controller_register(dev, &rstc->reset); 63 if (ret) { 64 dev_err(dev, "failed to register reset controller\n"); 65 return ret; 66 } 67 68 /* Populate regmap */ 69 for (clkid = 0; clkid < data->num_clks; clkid++) 70 data->clks[clkid]->map = regmap; 71 72 /* Register all clks */ 73 for (clkid = 0; clkid < data->hw_data->num; clkid++) { 74 if (!data->hw_data->hws[clkid]) 75 continue; 76 77 ret = devm_clk_hw_register(dev, data->hw_data->hws[clkid]); 78 if (ret) { 79 dev_err(dev, "Clock registration failed\n"); 80 return ret; 81 } 82 } 83 84 return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, 85 (void *) data->hw_data); 86 } 87