drivers/clk/meson/meson-eeclk.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2019 BayLibre, SAS.
   4  * Author: Jerome Brunet <jbrunet@baylibre.com>
   5  */
   6
   7 #include <linux/clk-provider.h>
   8 #include <linux/of_device.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/mfd/syscon.h>
  11 #include <linux/regmap.h>
  12
  13 #include "clk-input.h"
  14 #include "clk-regmap.h"
  15 #include "meson-eeclk.h"
  16
  17 int meson_eeclkc_probe(struct platform_device *pdev)
  18 {
  19         const struct meson_eeclkc_data *data;
  20         struct device *dev = &pdev->dev;
  21         struct clk_hw *input;
  22         struct regmap *map;
  23         int ret, i;
  24
  25         data = of_device_get_match_data(dev);
  26         if (!data)
  27                 return -EINVAL;
  28
  29         /* Get the hhi system controller node */
  30         map = syscon_node_to_regmap(of_get_parent(dev->of_node));
  31         if (IS_ERR(map)) {
  32                 dev_err(dev,
  33                         "failed to get HHI regmap\n");
  34                 return PTR_ERR(map);
  35         }
  36
  37         if (data->init_count)
  38                 regmap_multi_reg_write(map, data->init_regs, data->init_count);
  39
  40         input = meson_clk_hw_register_input(dev, "xtal", IN_PREFIX "xtal", 0);
  41         if (IS_ERR(input)) {
  42                 ret = PTR_ERR(input);
  43                 if (ret != -EPROBE_DEFER)
  44                         dev_err(dev, "failed to get input clock");
  45                 return ret;
  46         }
  47
  48         /* Populate regmap for the regmap backed clocks */
  49         for (i = 0; i < data->regmap_clk_num; i++)
  50                 data->regmap_clks[i]->map = map;
  51
  52         for (i = 0; i < data->hw_onecell_data->num; i++) {
  53                 /* array might be sparse */
  54                 if (!data->hw_onecell_data->hws[i])
  55                         continue;
  56
  57                 ret = devm_clk_hw_register(dev, data->hw_onecell_data->hws[i]);
  58                 if (ret) {
  59                         dev_err(dev, "Clock registration failed\n");
  60                         return ret;
  61                 }
  62         }
  63
  64         return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
  65                                            data->hw_onecell_data);
  66 }