// SPDX-License-Identifier: GPL-2.0+ /* * Amlogic Meson-AXG Clock Controller Driver * * Copyright (c) 2016 BayLibre, SAS. * Author: Neil Armstrong <narmstrong@baylibre.com> * * Copyright (c) 2018 Amlogic, inc. * Author: Qiufang Dai <qiufang.dai@amlogic.com> * Author: Yixun Lan <yixun.lan@amlogic.com> */ #include <linux/platform_device.h> #include <linux/reset-controller.h> #include <linux/mfd/syscon.h> #include <linux/of_device.h> #include <linux/slab.h> #include "meson-aoclk.h" static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev, unsigned long id) { struct meson_aoclk_reset_controller *rstc = container_of(rcdev, struct meson_aoclk_reset_controller, reset); return regmap_write(rstc->regmap, rstc->data->reset_reg, BIT(rstc->data->reset[id])); } static const struct reset_control_ops meson_aoclk_reset_ops = { .reset = meson_aoclk_do_reset, }; int meson_aoclkc_probe(struct platform_device *pdev) { struct meson_aoclk_reset_controller *rstc; struct meson_aoclk_data *data; struct device *dev = &pdev->dev; struct regmap *regmap; int ret, clkid; data = (struct meson_aoclk_data *) of_device_get_match_data(dev); if (!data) return -ENODEV; rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL); if (!rstc) return -ENOMEM; regmap = syscon_node_to_regmap(of_get_parent(dev->of_node)); if (IS_ERR(regmap)) { dev_err(dev, "failed to get regmap\n"); return PTR_ERR(regmap); } /* Reset Controller */ rstc->data = data; rstc->regmap = regmap; rstc->reset.ops = &meson_aoclk_reset_ops; rstc->reset.nr_resets = data->num_reset; rstc->reset.of_node = dev->of_node; ret = devm_reset_controller_register(dev, &rstc->reset); if (ret) { dev_err(dev, "failed to register reset controller\n"); return ret; } /* Populate regmap */ for (clkid = 0; clkid < data->num_clks; clkid++) data->clks[clkid]->map = regmap; /* Register all clks */ for (clkid = 0; clkid < data->hw_data->num; clkid++) { if (!data->hw_data->hws[clkid]) continue; ret = devm_clk_hw_register(dev, data->hw_data->hws[clkid]); if (ret) { dev_err(dev, "Clock registration failed\n"); return ret; } } return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, (void *) data->hw_data); }