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_node *node = pdev->dev.of_node;
  44         struct regmap *regmap;
  45
  46         if (of_find_property(node, "sprd,syscon", NULL)) {
  47                 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
  48                 if (IS_ERR(regmap)) {
  49                         pr_err("%s: failed to get syscon regmap\n", __func__);
  50                         return PTR_ERR(regmap);
  51                 }
  52         } else {
  53                 base = of_iomap(node, 0);
  54                 regmap = devm_regmap_init_mmio(&pdev->dev, base,
  55                                                &sprdclk_regmap_config);
  56                 if (IS_ERR_OR_NULL(regmap)) {
  57                         pr_err("failed to init regmap\n");
  58                         return PTR_ERR(regmap);
  59                 }
  60         }
  61
  62         sprd_clk_set_regmap(desc, regmap);
  63
  64         return 0;
  65 }
  66 EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
  67
  68 int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
  69 {
  70         int i, ret;
  71         struct clk_hw *hw;
  72
  73         for (i = 0; i < clkhw->num; i++) {
  74                 const char *name;
  75
  76                 hw = clkhw->hws[i];
  77                 if (!hw)
  78                         continue;
  79
  80                 name = hw->init->name;
  81                 ret = devm_clk_hw_register(dev, hw);
  82                 if (ret) {
  83                         dev_err(dev, "Couldn't register clock %d - %s\n",
  84                                 i, name);
  85                         return ret;
  86                 }
  87         }
  88
  89         ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
  90         if (ret)
  91                 dev_err(dev, "Failed to add clock provider\n");
  92
  93         return ret;
  94 }
  95 EXPORT_SYMBOL_GPL(sprd_clk_probe);
  96
  97 MODULE_LICENSE("GPL v2");