drivers/clk/imx/clk-imx8.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2018 NXP
   4  * Peng Fan <peng.fan@nxp.com>
   5  */
   6
   7 #include <common.h>
   8 #include <clk-uclass.h>
   9 #include <dm.h>
  10 #include <asm/arch/sci/sci.h>
  11 #include <asm/arch/clock.h>
  12 #include <dt-bindings/clock/imx8qxp-clock.h>
  13 #include <dt-bindings/soc/imx_rsrc.h>
  14 #include <misc.h>
  15
  16 #include "clk-imx8.h"
  17
  18 __weak ulong imx8_clk_get_rate(struct clk *clk)
  19 {
  20         return 0;
  21 }
  22
  23 __weak ulong imx8_clk_set_rate(struct clk *clk, unsigned long rate)
  24 {
  25         return 0;
  26 }
  27
  28 __weak int __imx8_clk_enable(struct clk *clk, bool enable)
  29 {
  30         return -ENOTSUPP;
  31 }
  32
  33 static int imx8_clk_disable(struct clk *clk)
  34 {
  35         return __imx8_clk_enable(clk, 0);
  36 }
  37
  38 static int imx8_clk_enable(struct clk *clk)
  39 {
  40         return __imx8_clk_enable(clk, 1);
  41 }
  42
  43 #if CONFIG_IS_ENABLED(CMD_CLK)
  44 int soc_clk_dump(void)
  45 {
  46         struct udevice *dev;
  47         struct clk clk;
  48         unsigned long rate;
  49         int i, ret;
  50
  51         ret = uclass_get_device_by_driver(UCLASS_CLK,
  52                                           DM_GET_DRIVER(imx8_clk), &dev);
  53         if (ret)
  54                 return ret;
  55
  56         printf("Clk\t\tHz\n");
  57
  58         for (i = 0; i < num_clks; i++) {
  59                 clk.id = imx8_clk_names[i].id;
  60                 ret = clk_request(dev, &clk);
  61                 if (ret < 0) {
  62                         debug("%s clk_request() failed: %d\n", __func__, ret);
  63                         continue;
  64                 }
  65
  66                 ret = clk_get_rate(&clk);
  67                 rate = ret;
  68
  69                 clk_free(&clk);
  70
  71                 if (ret == -ENOTSUPP) {
  72                         printf("clk ID %lu not supported yet\n",
  73                                imx8_clk_names[i].id);
  74                         continue;
  75                 }
  76                 if (ret < 0) {
  77                         printf("%s %lu: get_rate err: %d\n",
  78                                __func__, imx8_clk_names[i].id, ret);
  79                         continue;
  80                 }
  81
  82                 printf("%s(%3lu):\t%lu\n",
  83                        imx8_clk_names[i].name, imx8_clk_names[i].id, rate);
  84         }
  85
  86         return 0;
  87 }
  88 #endif
  89
  90 static struct clk_ops imx8_clk_ops = {
  91         .set_rate = imx8_clk_set_rate,
  92         .get_rate = imx8_clk_get_rate,
  93         .enable = imx8_clk_enable,
  94         .disable = imx8_clk_disable,
  95 };
  96
  97 static int imx8_clk_probe(struct udevice *dev)
  98 {
  99         return 0;
 100 }
 101
 102 static const struct udevice_id imx8_clk_ids[] = {
 103         { .compatible = "fsl,imx8qxp-clk" },
 104         { .compatible = "fsl,imx8qm-clk" },
 105         { },
 106 };
 107
 108 U_BOOT_DRIVER(imx8_clk) = {
 109         .name = "clk_imx8",
 110         .id = UCLASS_CLK,
 111         .of_match = imx8_clk_ids,
 112         .ops = &imx8_clk_ops,
 113         .probe = imx8_clk_probe,
 114         .flags = DM_FLAG_PRE_RELOC,
 115 };