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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Amlogic Meson-AXG Clock Controller Driver4 *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 22static 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 32static const struct reset_control_ops meson_aoclk_reset_ops = {33 .reset = meson_aoclk_do_reset,34};35 36int 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}91EXPORT_SYMBOL_NS_GPL(meson_aoclkc_probe, CLK_MESON);92 93MODULE_DESCRIPTION("Amlogic Always-ON Clock Controller helpers");94MODULE_LICENSE("GPL");95MODULE_IMPORT_NS(CLK_MESON);96