1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2020 Stefan Roese <sr@denx.de>
4 */
5
6 #include <clk-uclass.h>
7 #include <dm.h>
8 #include <asm/global_data.h>
9 #include <dt-bindings/clock/octeon-clock.h>
10
11 DECLARE_GLOBAL_DATA_PTR;
12
13 struct octeon_clk_priv {
14 u64 core_clk;
15 u64 io_clk;
16 };
17
octeon_clk_enable(struct clk * clk)18 static int octeon_clk_enable(struct clk *clk)
19 {
20 /* Nothing to do on Octeon */
21 return 0;
22 }
23
octeon_clk_get_rate(struct clk * clk)24 static ulong octeon_clk_get_rate(struct clk *clk)
25 {
26 struct octeon_clk_priv *priv = dev_get_priv(clk->dev);
27
28 switch (clk->id) {
29 case OCTEON_CLK_CORE:
30 return priv->core_clk;
31
32 case OCTEON_CLK_IO:
33 return priv->io_clk;
34
35 default:
36 return 0;
37 }
38
39 return 0;
40 }
41
42 static struct clk_ops octeon_clk_ops = {
43 .enable = octeon_clk_enable,
44 .get_rate = octeon_clk_get_rate,
45 };
46
47 static const struct udevice_id octeon_clk_ids[] = {
48 { .compatible = "mrvl,octeon-clk" },
49 { /* sentinel */ }
50 };
51
octeon_clk_probe(struct udevice * dev)52 static int octeon_clk_probe(struct udevice *dev)
53 {
54 struct octeon_clk_priv *priv = dev_get_priv(dev);
55
56 /*
57 * The clock values are already read into GD, lets just store them
58 * in priv data
59 */
60 priv->core_clk = gd->cpu_clk;
61 priv->io_clk = gd->bus_clk;
62
63 return 0;
64 }
65
66 U_BOOT_DRIVER(clk_octeon) = {
67 .name = "clk_octeon",
68 .id = UCLASS_CLK,
69 .of_match = octeon_clk_ids,
70 .ops = &octeon_clk_ops,
71 .probe = octeon_clk_probe,
72 .priv_auto = sizeof(struct octeon_clk_priv),
73 };
74