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c3828949 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7ea82504 GC |
2 | /* |
3 | * Marvell Armada 37xx SoC xtal clocks | |
4 | * | |
5 | * Copyright (C) 2016 Marvell | |
6 | * | |
7 | * Gregory CLEMENT <gregory.clement@free-electrons.com> | |
8 | * | |
7ea82504 GC |
9 | */ |
10 | ||
11 | #include <linux/clk-provider.h> | |
12 | #include <linux/mfd/syscon.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/regmap.h> | |
15 | ||
6f37689c TZ |
16 | #define NB_GPIO1_LATCH 0x8 |
17 | #define XTAL_MODE BIT(9) | |
7ea82504 GC |
18 | |
19 | static int armada_3700_xtal_clock_probe(struct platform_device *pdev) | |
20 | { | |
21 | struct device_node *np = pdev->dev.of_node; | |
22 | const char *xtal_name = "xtal"; | |
23 | struct device_node *parent; | |
24 | struct regmap *regmap; | |
25 | struct clk_hw *xtal_hw; | |
26 | unsigned int rate; | |
27 | u32 reg; | |
28 | int ret; | |
29 | ||
30 | xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL); | |
31 | if (!xtal_hw) | |
32 | return -ENOMEM; | |
33 | ||
34 | platform_set_drvdata(pdev, xtal_hw); | |
35 | ||
36 | parent = np->parent; | |
37 | if (!parent) { | |
38 | dev_err(&pdev->dev, "no parent\n"); | |
39 | return -ENODEV; | |
40 | } | |
41 | ||
42 | regmap = syscon_node_to_regmap(parent); | |
43 | if (IS_ERR(regmap)) { | |
44 | dev_err(&pdev->dev, "cannot get regmap\n"); | |
45 | return PTR_ERR(regmap); | |
46 | } | |
47 | ||
48 | ret = regmap_read(regmap, NB_GPIO1_LATCH, ®); | |
49 | if (ret) { | |
50 | dev_err(&pdev->dev, "cannot read from regmap\n"); | |
51 | return ret; | |
52 | } | |
53 | ||
54 | if (reg & XTAL_MODE) | |
55 | rate = 40000000; | |
56 | else | |
57 | rate = 25000000; | |
58 | ||
59 | of_property_read_string_index(np, "clock-output-names", 0, &xtal_name); | |
60 | xtal_hw = clk_hw_register_fixed_rate(NULL, xtal_name, NULL, 0, rate); | |
61 | if (IS_ERR(xtal_hw)) | |
62 | return PTR_ERR(xtal_hw); | |
63 | ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, xtal_hw); | |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
68 | static int armada_3700_xtal_clock_remove(struct platform_device *pdev) | |
69 | { | |
70 | of_clk_del_provider(pdev->dev.of_node); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static const struct of_device_id armada_3700_xtal_clock_of_match[] = { | |
76 | { .compatible = "marvell,armada-3700-xtal-clock", }, | |
77 | { } | |
78 | }; | |
79 | ||
80 | static struct platform_driver armada_3700_xtal_clock_driver = { | |
81 | .probe = armada_3700_xtal_clock_probe, | |
82 | .remove = armada_3700_xtal_clock_remove, | |
83 | .driver = { | |
84 | .name = "marvell-armada-3700-xtal-clock", | |
85 | .of_match_table = armada_3700_xtal_clock_of_match, | |
86 | }, | |
87 | }; | |
88 | ||
89 | builtin_platform_driver(armada_3700_xtal_clock_driver); |