Merge branch 'master' of git://git.denx.de/u-boot-imx
[platform/kernel/u-boot.git] / drivers / clk / at91 / pmc.c
1 /*
2  * Copyright (C) 2016 Atmel Corporation
3  *               Wenyou.Yang <wenyou.yang@atmel.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <clk-uclass.h>
10 #include <dm/device.h>
11 #include <dm/lists.h>
12 #include <dm/root.h>
13 #include <dm/util.h>
14 #include "pmc.h"
15
16 DECLARE_GLOBAL_DATA_PTR;
17
18 static const struct udevice_id at91_pmc_match[] = {
19         { .compatible = "atmel,at91rm9200-pmc" },
20         { .compatible = "atmel,at91sam9260-pmc" },
21         { .compatible = "atmel,at91sam9g45-pmc" },
22         { .compatible = "atmel,at91sam9n12-pmc" },
23         { .compatible = "atmel,at91sam9x5-pmc" },
24         { .compatible = "atmel,sama5d3-pmc" },
25         { .compatible = "atmel,sama5d2-pmc" },
26         {}
27 };
28
29 U_BOOT_DRIVER(at91_pmc) = {
30         .name = "at91-pmc",
31         .id = UCLASS_SIMPLE_BUS,
32         .of_match = at91_pmc_match,
33 };
34
35 /*---------------------------------------------------------*/
36
37 int at91_pmc_core_probe(struct udevice *dev)
38 {
39         struct pmc_platdata *plat = dev_get_platdata(dev);
40
41         dev = dev_get_parent(dev);
42
43         plat->reg_base = (struct at91_pmc *)dev_get_addr_ptr(dev);
44
45         return 0;
46 }
47
48 /**
49  * at91_clk_sub_device_bind() - for the at91 clock driver
50  * Recursively bind its children as clk devices.
51  *
52  * @return: 0 on success, or negative error code on failure
53  */
54 int at91_clk_sub_device_bind(struct udevice *dev, const char *drv_name)
55 {
56         const void *fdt = gd->fdt_blob;
57         int offset = dev_of_offset(dev);
58         bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
59         const char *name;
60         int ret;
61
62         for (offset = fdt_first_subnode(fdt, offset);
63              offset > 0;
64              offset = fdt_next_subnode(fdt, offset)) {
65                 if (pre_reloc_only &&
66                     !dm_fdt_pre_reloc(fdt, offset))
67                         continue;
68                 /*
69                  * If this node has "compatible" property, this is not
70                  * a clock sub-node, but a normal device. skip.
71                  */
72                 fdt_get_property(fdt, offset, "compatible", &ret);
73                 if (ret >= 0)
74                         continue;
75
76                 if (ret != -FDT_ERR_NOTFOUND)
77                         return ret;
78
79                 name = fdt_get_name(fdt, offset, NULL);
80                 if (!name)
81                         return -EINVAL;
82                 ret = device_bind_driver_to_node(dev, drv_name, name,
83                                                  offset, NULL);
84                 if (ret)
85                         return ret;
86         }
87
88         return 0;
89 }
90
91 int at91_clk_of_xlate(struct clk *clk, struct fdtdec_phandle_args *args)
92 {
93         int periph;
94
95         if (args->args_count) {
96                 debug("Invalid args_count: %d\n", args->args_count);
97                 return -EINVAL;
98         }
99
100         periph = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(clk->dev), "reg",
101                                  -1);
102         if (periph < 0)
103                 return -EINVAL;
104
105         clk->id = periph;
106
107         return 0;
108 }
109
110 int at91_clk_probe(struct udevice *dev)
111 {
112         struct udevice *dev_periph_container, *dev_pmc;
113         struct pmc_platdata *plat = dev_get_platdata(dev);
114
115         dev_periph_container = dev_get_parent(dev);
116         dev_pmc = dev_get_parent(dev_periph_container);
117
118         plat->reg_base = (struct at91_pmc *)dev_get_addr_ptr(dev_pmc);
119
120         return 0;
121 }