LXR linux/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/of_address.h>
  12#include <linux/of_platform.h>
  13#include <linux/platform_device.h>
  14#include <linux/regmap.h>
  15
  16#include "owl-common.h"
  17
  18static const struct regmap_config owl_regmap_config = {
  19        .reg_bits       = 32,
  20        .reg_stride     = 4,
  21        .val_bits       = 32,
  22        .max_register   = 0x00cc,
  23        .fast_io        = true,
  24};
  25
  26static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
  27                         struct regmap *regmap)
  28{
  29        int i;
  30        struct owl_clk_common *clks;
  31
  32        for (i = 0; i < desc->num_clks; i++) {
  33                clks = desc->clks[i];
  34                if (!clks)
  35                        continue;
  36
  37                clks->regmap = regmap;
  38        }
  39}
  40
  41int owl_clk_regmap_init(struct platform_device *pdev,
  42                        struct owl_clk_desc *desc)
  43{
  44        void __iomem *base;
  45        struct regmap *regmap;
  46        struct resource *res;
  47
  48        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  49        base = devm_ioremap_resource(&pdev->dev, res);
  50        if (IS_ERR(base))
  51                return PTR_ERR(base);
  52
  53        regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
  54        if (IS_ERR(regmap)) {
  55                pr_err("failed to init regmap\n");
  56                return PTR_ERR(regmap);
  57        }
  58
  59        owl_clk_set_regmap(desc, regmap);
  60        desc->regmap = regmap;
  61
  62        return 0;
  63}
  64
  65int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
  66{
  67        int i, ret;
  68        struct clk_hw *hw;
  69
  70        for (i = 0; i < hw_clks->num; i++) {
  71                const char *name;
  72
  73                hw = hw_clks->hws[i];
  74                if (IS_ERR_OR_NULL(hw))
  75                        continue;
  76
  77                name = hw->init->name;
  78                ret = devm_clk_hw_register(dev, hw);
  79                if (ret) {
  80                        dev_err(dev, "Couldn't register clock %d - %s\n",
  81                                i, name);
  82                        return ret;
  83                }
  84        }
  85
  86        ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
  87        if (ret)
  88                dev_err(dev, "Failed to add clock provider\n");
  89
  90        return ret;
  91}
  92