drivers/clk/imx/clk-imx8.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2018 NXP
   4  * Peng Fan <[email protected]>
   5  */
   6
   7 #include <clk-uclass.h>
   8 #include <dm.h>
   9 #include <log.h>
  10 #include <malloc.h>
  11 #include <firmware/imx/sci/sci.h>
  12 #include <asm/arch/clock.h>
  13 #include <dt-bindings/clock/imx8qxp-clock.h>
  14 #include <dt-bindings/soc/imx_rsrc.h>
  15 #include <misc.h>
  16
  17 #include "clk-imx8.h"
  18
  19 __weak ulong imx8_clk_get_rate(struct clk *clk)
  20 {
  21         return 0;
  22 }
  23
  24 __weak ulong imx8_clk_set_rate(struct clk *clk, unsigned long rate)
  25 {
  26         return 0;
  27 }
  28
  29 __weak int __imx8_clk_enable(struct clk *clk, bool enable)
  30 {
  31         return -EINVAL;
  32 }
  33
  34 static int imx8_clk_disable(struct clk *clk)
  35 {
  36         return __imx8_clk_enable(clk, 0);
  37 }
  38
  39 static int imx8_clk_enable(struct clk *clk)
  40 {
  41         return __imx8_clk_enable(clk, 1);
  42 }
  43
  44 #if IS_ENABLED(CONFIG_CMD_CLK)
  45 static void imx8_clk_dump(struct udevice *dev)
  46 {
  47         struct clk clk;
  48         unsigned long rate;
  49         int i, ret;
  50
  51         printf("Clk\t\tHz\n");
  52
  53         for (i = 0; i < num_clks; i++) {
  54                 clk.id = imx8_clk_names[i].id;
  55                 ret = clk_request(dev, &clk);
  56                 if (ret < 0) {
  57                         debug("%s clk_request() failed: %d\n", __func__, ret);
  58                         continue;
  59                 }
  60
  61                 ret = clk_get_rate(&clk);
  62                 rate = ret;
  63
  64                 if (ret == -EINVAL) {
  65                         printf("clk ID %lu not supported yet\n",
  66                                imx8_clk_names[i].id);
  67                         continue;
  68                 }
  69                 if (ret < 0) {
  70                         printf("%s %lu: get_rate err: %d\n",
  71                                __func__, imx8_clk_names[i].id, ret);
  72                         continue;
  73                 }
  74
  75                 printf("%s(%3lu):\t%lu\n",
  76                        imx8_clk_names[i].name, imx8_clk_names[i].id, rate);
  77         }
  78 }
  79 #endif
  80
  81 static struct clk_ops imx8_clk_ops = {
  82         .set_rate = imx8_clk_set_rate,
  83         .get_rate = imx8_clk_get_rate,
  84         .enable = imx8_clk_enable,
  85         .disable = imx8_clk_disable,
  86 #if IS_ENABLED(CONFIG_CMD_CLK)
  87         .dump = imx8_clk_dump,
  88 #endif
  89 };
  90
  91 static int imx8_clk_probe(struct udevice *dev)
  92 {
  93         return 0;
  94 }
  95
  96 static const struct udevice_id imx8_clk_ids[] = {
  97         { .compatible = "fsl,imx8qxp-clk" },
  98         { .compatible = "fsl,imx8qm-clk" },
  99         { },
 100 };
 101
 102 U_BOOT_DRIVER(imx8_clk) = {
 103         .name = "clk_imx8",
 104         .id = UCLASS_CLK,
 105         .of_match = imx8_clk_ids,
 106         .ops = &imx8_clk_ops,
 107         .probe = imx8_clk_probe,
 108         .flags = DM_FLAG_PRE_RELOC,
 109 };