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