git.sur5r.net Git - u-boot/blob - drivers/clk/clk_fixed_rate.c

   1 /*
   2  * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <clk-uclass.h>
   9 #include <dm.h>
  10
  11 DECLARE_GLOBAL_DATA_PTR;
  12
  13 struct clk_fixed_rate {
  14         unsigned long fixed_rate;
  15 };
  16
  17 #define to_clk_fixed_rate(dev)  ((struct clk_fixed_rate *)dev_get_platdata(dev))
  18
  19 static ulong clk_fixed_rate_get_rate(struct clk *clk)
  20 {
  21         if (clk->id != 0)
  22                 return -EINVAL;
  23
  24         return to_clk_fixed_rate(clk->dev)->fixed_rate;
  25 }
  26
  27 const struct clk_ops clk_fixed_rate_ops = {
  28         .get_rate = clk_fixed_rate_get_rate,
  29 };
  30
  31 static int clk_fixed_rate_ofdata_to_platdata(struct udevice *dev)
  32 {
  33 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
  34         to_clk_fixed_rate(dev)->fixed_rate = dev_read_u32_default(dev,
  35                                                         "clock-frequency", 0);
  36 #endif
  37
  38         return 0;
  39 }
  40
  41 static const struct udevice_id clk_fixed_rate_match[] = {
  42         {
  43                 .compatible = "fixed-clock",
  44         },
  45         { /* sentinel */ }
  46 };
  47
  48 U_BOOT_DRIVER(clk_fixed_rate) = {
  49         .name = "fixed_rate_clock",
  50         .id = UCLASS_CLK,
  51         .of_match = clk_fixed_rate_match,
  52         .ofdata_to_platdata = clk_fixed_rate_ofdata_to_platdata,
  53         .platdata_auto_alloc_size = sizeof(struct clk_fixed_rate),
  54         .ops = &clk_fixed_rate_ops,
  55 };