drivers/mfd/sun6i-prcm.c

   1 /*
   2  * Copyright (C) 2014 Free Electrons
   3  *
   4  * License Terms: GNU General Public License v2
   5  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
   6  *
   7  * Allwinner PRCM (Power/Reset/Clock Management) driver
   8  *
   9  */
  10
  11 #include <linux/mfd/core.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14
  15 struct prcm_data {
  16         int nsubdevs;
  17         const struct mfd_cell *subdevs;
  18 };
  19
  20 static const struct resource sun6i_a31_ar100_clk_res[] = {
  21         {
  22                 .start = 0x0,
  23                 .end = 0x3,
  24                 .flags = IORESOURCE_MEM,
  25         },
  26 };
  27
  28 static const struct resource sun6i_a31_apb0_clk_res[] = {
  29         {
  30                 .start = 0xc,
  31                 .end = 0xf,
  32                 .flags = IORESOURCE_MEM,
  33         },
  34 };
  35
  36 static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
  37         {
  38                 .start = 0x28,
  39                 .end = 0x2b,
  40                 .flags = IORESOURCE_MEM,
  41         },
  42 };
  43
  44 static const struct resource sun6i_a31_apb0_rstc_res[] = {
  45         {
  46                 .start = 0xb0,
  47                 .end = 0xb3,
  48                 .flags = IORESOURCE_MEM,
  49         },
  50 };
  51
  52 static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
  53         {
  54                 .name = "sun6i-a31-ar100-clk",
  55                 .of_compatible = "allwinner,sun6i-a31-ar100-clk",
  56                 .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
  57                 .resources = sun6i_a31_ar100_clk_res,
  58         },
  59         {
  60                 .name = "sun6i-a31-apb0-clk",
  61                 .of_compatible = "allwinner,sun6i-a31-apb0-clk",
  62                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
  63                 .resources = sun6i_a31_apb0_clk_res,
  64         },
  65         {
  66                 .name = "sun6i-a31-apb0-gates-clk",
  67                 .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
  68                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
  69                 .resources = sun6i_a31_apb0_gates_clk_res,
  70         },
  71         {
  72                 .name = "sun6i-a31-apb0-clock-reset",
  73                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
  74                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
  75                 .resources = sun6i_a31_apb0_rstc_res,
  76         },
  77 };
  78
  79 static const struct prcm_data sun6i_a31_prcm_data = {
  80         .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
  81         .subdevs = sun6i_a31_prcm_subdevs,
  82 };
  83
  84 static const struct of_device_id sun6i_prcm_dt_ids[] = {
  85         {
  86                 .compatible = "allwinner,sun6i-a31-prcm",
  87                 .data = &sun6i_a31_prcm_data,
  88         },
  89         { /* sentinel */ },
  90 };
  91
  92 static int sun6i_prcm_probe(struct platform_device *pdev)
  93 {
  94         struct device_node *np = pdev->dev.of_node;
  95         const struct of_device_id *match;
  96         const struct prcm_data *data;
  97         struct resource *res;
  98         int ret;
  99
 100         match = of_match_node(sun6i_prcm_dt_ids, np);
 101         if (!match)
 102                 return -EINVAL;
 103
 104         data = match->data;
 105
 106         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 107         if (!res) {
 108                 dev_err(&pdev->dev, "no prcm memory region provided\n");
 109                 return -ENOENT;
 110         }
 111
 112         ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
 113                               res, -1, NULL);
 114         if (ret) {
 115                 dev_err(&pdev->dev, "failed to add subdevices\n");
 116                 return ret;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static struct platform_driver sun6i_prcm_driver = {
 123         .driver = {
 124                 .name = "sun6i-prcm",
 125                 .owner = THIS_MODULE,
 126                 .of_match_table = sun6i_prcm_dt_ids,
 127         },
 128         .probe = sun6i_prcm_probe,
 129 };
 130 module_platform_driver(sun6i_prcm_driver);
 131
 132 MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>");
 133 MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
 134 MODULE_LICENSE("GPL v2");