Merge tag 'dmaengine-fix-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul...
[linux-2.6-microblaze.git] / drivers / clk / versatile / clk-impd1.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Clock driver for the ARM Integrator/IM-PD1 board
4  * Copyright (C) 2012-2013 Linus Walleij
5  */
6 #include <linux/clk-provider.h>
7 #include <linux/clkdev.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/platform_device.h>
11 #include <linux/module.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/regmap.h>
14
15 #include "icst.h"
16 #include "clk-icst.h"
17
18 #define IMPD1_OSC1      0x00
19 #define IMPD1_OSC2      0x04
20 #define IMPD1_LOCK      0x08
21
22 /*
23  * There are two VCO's on the IM-PD1
24  */
25
26 static const struct icst_params impd1_vco1_params = {
27         .ref            = 24000000,     /* 24 MHz */
28         .vco_max        = ICST525_VCO_MAX_3V,
29         .vco_min        = ICST525_VCO_MIN,
30         .vd_min         = 12,
31         .vd_max         = 519,
32         .rd_min         = 3,
33         .rd_max         = 120,
34         .s2div          = icst525_s2div,
35         .idx2s          = icst525_idx2s,
36 };
37
38 static const struct clk_icst_desc impd1_icst1_desc = {
39         .params = &impd1_vco1_params,
40         .vco_offset = IMPD1_OSC1,
41         .lock_offset = IMPD1_LOCK,
42 };
43
44 static const struct icst_params impd1_vco2_params = {
45         .ref            = 24000000,     /* 24 MHz */
46         .vco_max        = ICST525_VCO_MAX_3V,
47         .vco_min        = ICST525_VCO_MIN,
48         .vd_min         = 12,
49         .vd_max         = 519,
50         .rd_min         = 3,
51         .rd_max         = 120,
52         .s2div          = icst525_s2div,
53         .idx2s          = icst525_idx2s,
54 };
55
56 static const struct clk_icst_desc impd1_icst2_desc = {
57         .params = &impd1_vco2_params,
58         .vco_offset = IMPD1_OSC2,
59         .lock_offset = IMPD1_LOCK,
60 };
61
62 static int integrator_impd1_clk_spawn(struct device *dev,
63                                       struct device_node *parent,
64                                       struct device_node *np)
65 {
66         struct regmap *map;
67         struct clk *clk = ERR_PTR(-EINVAL);
68         const char *name = np->name;
69         const char *parent_name;
70         const struct clk_icst_desc *desc;
71         int ret;
72
73         map = syscon_node_to_regmap(parent);
74         if (IS_ERR(map)) {
75                 pr_err("no regmap for syscon IM-PD1 ICST clock parent\n");
76                 return PTR_ERR(map);
77         }
78
79         if (of_device_is_compatible(np, "arm,impd1-vco1")) {
80                 desc = &impd1_icst1_desc;
81         } else if (of_device_is_compatible(np, "arm,impd1-vco2")) {
82                 desc = &impd1_icst2_desc;
83         } else {
84                 dev_err(dev, "not a clock node %s\n", name);
85                 return -ENODEV;
86         }
87
88         of_property_read_string(np, "clock-output-names", &name);
89         parent_name = of_clk_get_parent_name(np, 0);
90         clk = icst_clk_setup(NULL, desc, name, parent_name, map,
91                              ICST_INTEGRATOR_IM_PD1);
92         if (!IS_ERR(clk)) {
93                 of_clk_add_provider(np, of_clk_src_simple_get, clk);
94                 ret = 0;
95         } else {
96                 dev_err(dev, "error setting up IM-PD1 ICST clock\n");
97                 ret = PTR_ERR(clk);
98         }
99
100         return ret;
101 }
102
103 static int integrator_impd1_clk_probe(struct platform_device *pdev)
104 {
105         struct device *dev = &pdev->dev;
106         struct device_node *np = dev->of_node;
107         struct device_node *child;
108         int ret = 0;
109
110         for_each_available_child_of_node(np, child) {
111                 ret = integrator_impd1_clk_spawn(dev, np, child);
112                 if (ret) {
113                         of_node_put(child);
114                         break;
115                 }
116         }
117
118         return ret;
119 }
120
121 static const struct of_device_id impd1_syscon_match[] = {
122         { .compatible = "arm,im-pd1-syscon", },
123         {}
124 };
125 MODULE_DEVICE_TABLE(of, impd1_syscon_match);
126
127 static struct platform_driver impd1_clk_driver = {
128         .driver = {
129                 .name = "impd1-clk",
130                 .of_match_table = impd1_syscon_match,
131         },
132         .probe  = integrator_impd1_clk_probe,
133 };
134 builtin_platform_driver(impd1_clk_driver);
135
136 MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
137 MODULE_DESCRIPTION("Arm IM-PD1 module clock driver");
138 MODULE_LICENSE("GPL v2");