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fcf77be8 MW |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Layerscape FlexSPI clock driver | |
4 | * | |
5 | * Copyright 2020 Michael Walle <michael@walle.cc> | |
6 | */ | |
7 | ||
8 | #include <linux/clk-provider.h> | |
9 | #include <linux/io.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/platform_device.h> | |
12 | ||
13 | static const struct clk_div_table ls1028a_flexspi_divs[] = { | |
14 | { .val = 0, .div = 1, }, | |
15 | { .val = 1, .div = 2, }, | |
16 | { .val = 2, .div = 3, }, | |
17 | { .val = 3, .div = 4, }, | |
18 | { .val = 4, .div = 5, }, | |
19 | { .val = 5, .div = 6, }, | |
20 | { .val = 6, .div = 7, }, | |
21 | { .val = 7, .div = 8, }, | |
22 | { .val = 11, .div = 12, }, | |
23 | { .val = 15, .div = 16, }, | |
24 | { .val = 16, .div = 20, }, | |
25 | { .val = 17, .div = 24, }, | |
26 | { .val = 18, .div = 28, }, | |
27 | { .val = 19, .div = 32, }, | |
28 | { .val = 20, .div = 80, }, | |
29 | {} | |
30 | }; | |
31 | ||
32 | static const struct clk_div_table lx2160a_flexspi_divs[] = { | |
33 | { .val = 1, .div = 2, }, | |
34 | { .val = 3, .div = 4, }, | |
35 | { .val = 5, .div = 6, }, | |
36 | { .val = 7, .div = 8, }, | |
37 | { .val = 11, .div = 12, }, | |
38 | { .val = 15, .div = 16, }, | |
39 | { .val = 16, .div = 20, }, | |
40 | { .val = 17, .div = 24, }, | |
41 | { .val = 18, .div = 28, }, | |
42 | { .val = 19, .div = 32, }, | |
43 | { .val = 20, .div = 80, }, | |
44 | {} | |
45 | }; | |
46 | ||
47 | static int fsl_flexspi_clk_probe(struct platform_device *pdev) | |
48 | { | |
49 | struct device *dev = &pdev->dev; | |
50 | struct device_node *np = dev->of_node; | |
51 | const char *clk_name = np->name; | |
52 | const char *clk_parent; | |
53 | struct resource *res; | |
54 | void __iomem *reg; | |
55 | struct clk_hw *hw; | |
56 | const struct clk_div_table *divs; | |
57 | ||
58 | divs = device_get_match_data(dev); | |
59 | if (!divs) | |
60 | return -ENOENT; | |
61 | ||
62 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
63 | if (!res) | |
64 | return -ENOENT; | |
65 | ||
66 | /* | |
67 | * Can't use devm_ioremap_resource() or devm_of_iomap() because the | |
68 | * resource might already be taken by the parent device. | |
69 | */ | |
70 | reg = devm_ioremap(dev, res->start, resource_size(res)); | |
71 | if (!reg) | |
72 | return -ENOMEM; | |
73 | ||
74 | clk_parent = of_clk_get_parent_name(np, 0); | |
75 | if (!clk_parent) | |
76 | return -EINVAL; | |
77 | ||
78 | of_property_read_string(np, "clock-output-names", &clk_name); | |
79 | ||
80 | hw = devm_clk_hw_register_divider_table(dev, clk_name, clk_parent, 0, | |
81 | reg, 0, 5, 0, divs, NULL); | |
82 | if (IS_ERR(hw)) | |
83 | return PTR_ERR(hw); | |
84 | ||
85 | return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw); | |
86 | } | |
87 | ||
88 | static const struct of_device_id fsl_flexspi_clk_dt_ids[] = { | |
89 | { .compatible = "fsl,ls1028a-flexspi-clk", .data = &ls1028a_flexspi_divs }, | |
90 | { .compatible = "fsl,lx2160a-flexspi-clk", .data = &lx2160a_flexspi_divs }, | |
91 | {} | |
92 | }; | |
93 | MODULE_DEVICE_TABLE(of, fsl_flexspi_clk_dt_ids); | |
94 | ||
95 | static struct platform_driver fsl_flexspi_clk_driver = { | |
96 | .driver = { | |
97 | .name = "fsl-flexspi-clk", | |
98 | .of_match_table = fsl_flexspi_clk_dt_ids, | |
99 | }, | |
100 | .probe = fsl_flexspi_clk_probe, | |
101 | }; | |
102 | module_platform_driver(fsl_flexspi_clk_driver); | |
103 | ||
104 | MODULE_DESCRIPTION("FlexSPI clock driver for Layerscape SoCs"); | |
105 | MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); | |
106 | MODULE_LICENSE("GPL"); |