linux/drivers/clk/sprd/common.c
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   1// SPDX-License-Identifier: GPL-2.0
   2//
   3// Spreadtrum clock infrastructure
   4//
   5// Copyright (C) 2017 Spreadtrum, Inc.
   6// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
   7
   8#include <linux/mfd/syscon.h>
   9#include <linux/module.h>
  10#include <linux/of_address.h>
  11#include <linux/of_platform.h>
  12#include <linux/regmap.h>
  13
  14#include "common.h"
  15
  16static const struct regmap_config sprdclk_regmap_config = {
  17        .reg_bits       = 32,
  18        .reg_stride     = 4,
  19        .val_bits       = 32,
  20        .max_register   = 0xffff,
  21        .fast_io        = true,
  22};
  23
  24static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
  25                         struct regmap *regmap)
  26{
  27        int i;
  28        struct sprd_clk_common *cclk;
  29
  30        for (i = 0; i < desc->num_clk_clks; i++) {
  31                cclk = desc->clk_clks[i];
  32                if (!cclk)
  33                        continue;
  34
  35                cclk->regmap = regmap;
  36        }
  37}
  38
  39int sprd_clk_regmap_init(struct platform_device *pdev,
  40                         const struct sprd_clk_desc *desc)
  41{
  42        void __iomem *base;
  43        struct device *dev = &pdev->dev;
  44        struct device_node *node = dev->of_node;
  45        struct regmap *regmap;
  46
  47        if (of_find_property(node, "sprd,syscon", NULL)) {
  48                regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
  49                if (IS_ERR(regmap)) {
  50                        pr_err("%s: failed to get syscon regmap\n", __func__);
  51                        return PTR_ERR(regmap);
  52                }
  53        } else if (of_device_is_compatible(of_get_parent(dev->of_node),
  54                           "syscon")) {
  55                regmap = device_node_to_regmap(of_get_parent(dev->of_node));
  56                if (IS_ERR(regmap)) {
  57                        dev_err(dev, "failed to get regmap from its parent.\n");
  58                        return PTR_ERR(regmap);
  59                }
  60        } else {
  61                base = devm_platform_ioremap_resource(pdev, 0);
  62                if (IS_ERR(base))
  63                        return PTR_ERR(base);
  64
  65                regmap = devm_regmap_init_mmio(&pdev->dev, base,
  66                                               &sprdclk_regmap_config);
  67                if (IS_ERR(regmap)) {
  68                        pr_err("failed to init regmap\n");
  69                        return PTR_ERR(regmap);
  70                }
  71        }
  72
  73        sprd_clk_set_regmap(desc, regmap);
  74
  75        return 0;
  76}
  77EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
  78
  79int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
  80{
  81        int i, ret;
  82        struct clk_hw *hw;
  83
  84        for (i = 0; i < clkhw->num; i++) {
  85                const char *name;
  86
  87                hw = clkhw->hws[i];
  88                if (!hw)
  89                        continue;
  90
  91                name = hw->init->name;
  92                ret = devm_clk_hw_register(dev, hw);
  93                if (ret) {
  94                        dev_err(dev, "Couldn't register clock %d - %s\n",
  95                                i, name);
  96                        return ret;
  97                }
  98        }
  99
 100        ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
 101        if (ret)
 102                dev_err(dev, "Failed to add clock provider\n");
 103
 104        return ret;
 105}
 106EXPORT_SYMBOL_GPL(sprd_clk_probe);
 107
 108MODULE_LICENSE("GPL v2");
 109