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, offset: res->start, size: resource_size(res)); |
71 | if (!reg) |
72 | return -ENOMEM; |
73 | |
74 | clk_parent = of_clk_get_parent_name(np, index: 0); |
75 | if (!clk_parent) |
76 | return -EINVAL; |
77 | |
78 | of_property_read_string(np, propname: "clock-output-names" , out_string: &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(ptr: hw)) |
83 | return PTR_ERR(ptr: hw); |
84 | |
85 | return devm_of_clk_add_hw_provider(dev, get: of_clk_hw_simple_get, data: 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" ); |
107 | |