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
26static 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
38static 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
44static 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
56static 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
62static 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
103static 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
121static const struct of_device_id impd1_syscon_match[] = {
122	{ .compatible = "arm,im-pd1-syscon", },
123	{}
124};
125MODULE_DEVICE_TABLE(of, impd1_syscon_match);
126
127static 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};
134builtin_platform_driver(impd1_clk_driver);
135
136MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
137MODULE_DESCRIPTION("Arm IM-PD1 module clock driver");
138MODULE_LICENSE("GPL v2");
139