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7ea82504 GC |
1 | /* |
2 | * Marvell Armada 37xx SoC xtal clocks | |
3 | * | |
4 | * Copyright (C) 2016 Marvell | |
5 | * | |
6 | * Gregory CLEMENT <gregory.clement@free-electrons.com> | |
7 | * | |
8 | * This file is licensed under the terms of the GNU General Public | |
9 | * License version 2. This program is licensed "as is" without any | |
10 | * warranty of any kind, whether express or implied. | |
11 | */ | |
12 | ||
13 | #include <linux/clk-provider.h> | |
14 | #include <linux/mfd/syscon.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regmap.h> | |
17 | ||
18 | #define NB_GPIO1_LATCH 0xC | |
19 | #define XTAL_MODE BIT(31) | |
20 | ||
21 | static int armada_3700_xtal_clock_probe(struct platform_device *pdev) | |
22 | { | |
23 | struct device_node *np = pdev->dev.of_node; | |
24 | const char *xtal_name = "xtal"; | |
25 | struct device_node *parent; | |
26 | struct regmap *regmap; | |
27 | struct clk_hw *xtal_hw; | |
28 | unsigned int rate; | |
29 | u32 reg; | |
30 | int ret; | |
31 | ||
32 | xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL); | |
33 | if (!xtal_hw) | |
34 | return -ENOMEM; | |
35 | ||
36 | platform_set_drvdata(pdev, xtal_hw); | |
37 | ||
38 | parent = np->parent; | |
39 | if (!parent) { | |
40 | dev_err(&pdev->dev, "no parent\n"); | |
41 | return -ENODEV; | |
42 | } | |
43 | ||
44 | regmap = syscon_node_to_regmap(parent); | |
45 | if (IS_ERR(regmap)) { | |
46 | dev_err(&pdev->dev, "cannot get regmap\n"); | |
47 | return PTR_ERR(regmap); | |
48 | } | |
49 | ||
50 | ret = regmap_read(regmap, NB_GPIO1_LATCH, ®); | |
51 | if (ret) { | |
52 | dev_err(&pdev->dev, "cannot read from regmap\n"); | |
53 | return ret; | |
54 | } | |
55 | ||
56 | if (reg & XTAL_MODE) | |
57 | rate = 40000000; | |
58 | else | |
59 | rate = 25000000; | |
60 | ||
61 | of_property_read_string_index(np, "clock-output-names", 0, &xtal_name); | |
62 | xtal_hw = clk_hw_register_fixed_rate(NULL, xtal_name, NULL, 0, rate); | |
63 | if (IS_ERR(xtal_hw)) | |
64 | return PTR_ERR(xtal_hw); | |
65 | ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, xtal_hw); | |
66 | ||
67 | return ret; | |
68 | } | |
69 | ||
70 | static int armada_3700_xtal_clock_remove(struct platform_device *pdev) | |
71 | { | |
72 | of_clk_del_provider(pdev->dev.of_node); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static const struct of_device_id armada_3700_xtal_clock_of_match[] = { | |
78 | { .compatible = "marvell,armada-3700-xtal-clock", }, | |
79 | { } | |
80 | }; | |
81 | ||
82 | static struct platform_driver armada_3700_xtal_clock_driver = { | |
83 | .probe = armada_3700_xtal_clock_probe, | |
84 | .remove = armada_3700_xtal_clock_remove, | |
85 | .driver = { | |
86 | .name = "marvell-armada-3700-xtal-clock", | |
87 | .of_match_table = armada_3700_xtal_clock_of_match, | |
88 | }, | |
89 | }; | |
90 | ||
91 | builtin_platform_driver(armada_3700_xtal_clock_driver); |