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 <log.h>
  11 #include <malloc.h>
  12 #include <asm/arch/sci/sci.h>
  13 #include <asm/arch/clock.h>
  14 #include <dt-bindings/clock/imx8qxp-clock.h>
  15 #include <dt-bindings/soc/imx_rsrc.h>
  16 #include <misc.h>
  17
  18 #include "clk-imx8.h"
  19
  20 __weak ulong imx8_clk_get_rate(struct clk *clk)
  21 {
  22         return 0;
  23 }
  24
  25 __weak ulong imx8_clk_set_rate(struct clk *clk, unsigned long rate)
  26 {
  27         return 0;
  28 }
  29
  30 __weak int __imx8_clk_enable(struct clk *clk, bool enable)
  31 {
  32         return -ENOTSUPP;
  33 }
  34
  35 static int imx8_clk_disable(struct clk *clk)
  36 {
  37         return __imx8_clk_enable(clk, 0);
  38 }
  39
  40 static int imx8_clk_enable(struct clk *clk)
  41 {
  42         return __imx8_clk_enable(clk, 1);
  43 }
  44
  45 #if CONFIG_IS_ENABLED(CMD_CLK)
  46 int soc_clk_dump(void)
  47 {
  48         struct udevice *dev;
  49         struct clk clk;
  50         unsigned long rate;
  51         int i, ret;
  52
  53         ret = uclass_get_device_by_driver(UCLASS_CLK,
  54                                           DM_GET_DRIVER(imx8_clk), &dev);
  55         if (ret)
  56                 return ret;
  57
  58         printf("Clk\t\tHz\n");
  59
  60         for (i = 0; i < num_clks; i++) {
  61                 clk.id = imx8_clk_names[i].id;
  62                 ret = clk_request(dev, &clk);
  63                 if (ret < 0) {
  64                         debug("%s clk_request() failed: %d\n", __func__, ret);
  65                         continue;
  66                 }
  67
  68                 ret = clk_get_rate(&clk);
  69                 rate = ret;
  70
  71                 clk_free(&clk);
  72
  73                 if (ret == -ENOTSUPP) {
  74                         printf("clk ID %lu not supported yet\n",
  75                                imx8_clk_names[i].id);
  76                         continue;
  77                 }
  78                 if (ret < 0) {
  79                         printf("%s %lu: get_rate err: %d\n",
  80                                __func__, imx8_clk_names[i].id, ret);
  81                         continue;
  82                 }
  83
  84                 printf("%s(%3lu):\t%lu\n",
  85                        imx8_clk_names[i].name, imx8_clk_names[i].id, rate);
  86         }
  87
  88         return 0;
  89 }
  90 #endif
  91
  92 static struct clk_ops imx8_clk_ops = {
  93         .set_rate = imx8_clk_set_rate,
  94         .get_rate = imx8_clk_get_rate,
  95         .enable = imx8_clk_enable,
  96         .disable = imx8_clk_disable,
  97 };
  98
  99 static int imx8_clk_probe(struct udevice *dev)
 100 {
 101         return 0;
 102 }
 103
 104 static const struct udevice_id imx8_clk_ids[] = {
 105         { .compatible = "fsl,imx8qxp-clk" },
 106         { .compatible = "fsl,imx8qm-clk" },
 107         { },
 108 };
 109
 110 U_BOOT_DRIVER(imx8_clk) = {
 111         .name = "clk_imx8",
 112         .id = UCLASS_CLK,
 113         .of_match = imx8_clk_ids,
 114         .ops = &imx8_clk_ops,
 115         .probe = imx8_clk_probe,
 116         .flags = DM_FLAG_PRE_RELOC,
 117 };