drivers/clk/sprd/common.c

   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
  16 static 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
  24 static 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
  39 int 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 }
  77 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
  78
  79 int 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 }
 106 EXPORT_SYMBOL_GPL(sprd_clk_probe);
 107
 108 MODULE_LICENSE("GPL v2");