| // SPDX-License-Identifier: GPL-2.0 |
| // |
| // Spreadtrum clock infrastructure |
| // |
| // Copyright (C) 2017 Spreadtrum, Inc. |
| // Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com> |
| |
| #include <linux/mfd/syscon.h> |
| #include <linux/module.h> |
| #include <linux/of_address.h> |
| #include <linux/of_platform.h> |
| #include <linux/regmap.h> |
| |
| #include "common.h" |
| |
| static const struct regmap_config sprdclk_regmap_config = { |
| .reg_bits = 32, |
| .reg_stride = 4, |
| .val_bits = 32, |
| .max_register = 0xffff, |
| .fast_io = true, |
| }; |
| |
| static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc, |
| struct regmap *regmap) |
| { |
| int i; |
| struct sprd_clk_common *cclk; |
| |
| for (i = 0; i < desc->num_clk_clks; i++) { |
| cclk = desc->clk_clks[i]; |
| if (!cclk) |
| continue; |
| |
| cclk->regmap = regmap; |
| } |
| } |
| |
| int sprd_clk_regmap_init(struct platform_device *pdev, |
| const struct sprd_clk_desc *desc) |
| { |
| void __iomem *base; |
| struct device_node *node = pdev->dev.of_node; |
| struct regmap *regmap; |
| struct resource *res; |
| |
| if (of_find_property(node, "sprd,syscon", NULL)) { |
| regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon"); |
| if (IS_ERR_OR_NULL(regmap)) { |
| pr_err("%s: failed to get syscon regmap\n", __func__); |
| return PTR_ERR(regmap); |
| } |
| } else { |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| base = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| |
| regmap = devm_regmap_init_mmio(&pdev->dev, base, |
| &sprdclk_regmap_config); |
| if (IS_ERR(regmap)) { |
| pr_err("failed to init regmap\n"); |
| return PTR_ERR(regmap); |
| } |
| } |
| |
| sprd_clk_set_regmap(desc, regmap); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(sprd_clk_regmap_init); |
| |
| int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw) |
| { |
| int i, ret; |
| struct clk_hw *hw; |
| |
| for (i = 0; i < clkhw->num; i++) { |
| const char *name; |
| |
| hw = clkhw->hws[i]; |
| if (!hw) |
| continue; |
| |
| name = hw->init->name; |
| ret = devm_clk_hw_register(dev, hw); |
| if (ret) { |
| dev_err(dev, "Couldn't register clock %d - %s\n", |
| i, name); |
| return ret; |
| } |
| } |
| |
| ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw); |
| if (ret) |
| dev_err(dev, "Failed to add clock provider\n"); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(sprd_clk_probe); |
| |
| MODULE_LICENSE("GPL v2"); |