drivers/clk/actions/owl-common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // OWL common clock driver
   4 //
   5 // Copyright (c) 2014 Actions Semi Inc.
   6 // Author: David Liu <liuwei@actions-semi.com>
   7 //
   8 // Copyright (c) 2018 Linaro Ltd.
   9 // Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
  10
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13
  14 #include "owl-common.h"
  15
  16 static const struct regmap_config owl_regmap_config = {
  17         .reg_bits       = 32,
  18         .reg_stride     = 4,
  19         .val_bits       = 32,
  20         .max_register   = 0x00cc,
  21         .fast_io        = true,
  22 };
  23
  24 static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
  25                          struct regmap *regmap)
  26 {
  27         int i;
  28         struct owl_clk_common *clks;
  29
  30         for (i = 0; i < desc->num_clks; i++) {
  31                 clks = desc->clks[i];
  32                 if (!clks)
  33                         continue;
  34
  35                 clks->regmap = regmap;
  36         }
  37 }
  38
  39 int owl_clk_regmap_init(struct platform_device *pdev,
  40                         struct owl_clk_desc *desc)
  41 {
  42         void __iomem *base;
  43         struct regmap *regmap;
  44
  45         base = devm_platform_ioremap_resource(pdev, 0);
  46         if (IS_ERR(base))
  47                 return PTR_ERR(base);
  48
  49         regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
  50         if (IS_ERR(regmap)) {
  51                 pr_err("failed to init regmap\n");
  52                 return PTR_ERR(regmap);
  53         }
  54
  55         owl_clk_set_regmap(desc, regmap);
  56         desc->regmap = regmap;
  57
  58         return 0;
  59 }
  60
  61 int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
  62 {
  63         int i, ret;
  64         struct clk_hw *hw;
  65
  66         for (i = 0; i < hw_clks->num; i++) {
  67                 const char *name;
  68
  69                 hw = hw_clks->hws[i];
  70                 if (IS_ERR_OR_NULL(hw))
  71                         continue;
  72
  73                 name = hw->init->name;
  74                 ret = devm_clk_hw_register(dev, hw);
  75                 if (ret) {
  76                         dev_err(dev, "Couldn't register clock %d - %s\n",
  77                                 i, name);
  78                         return ret;
  79                 }
  80         }
  81
  82         ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
  83         if (ret)
  84                 dev_err(dev, "Failed to add clock provider\n");
  85
  86         return ret;
  87 }