1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
* Copyright (C) 2015 Broadcom
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <dt-bindings/clock/bcm2835-aux.h>
#define BCM2835_AUXIRQ 0x00
#define BCM2835_AUXENB 0x04
static int bcm2835_aux_clk_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct clk_hw_onecell_data *onecell;
const char *parent;
struct clk *parent_clk;
struct resource *res;
void __iomem *reg, *gate;
parent_clk = devm_clk_get(dev, NULL);
if (IS_ERR(parent_clk))
return PTR_ERR(parent_clk);
parent = __clk_get_name(parent_clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg = devm_ioremap_resource(dev, res);
if (IS_ERR(reg))
return PTR_ERR(reg);
onecell = devm_kmalloc(dev,
struct_size(onecell, hws,
BCM2835_AUX_CLOCK_COUNT),
GFP_KERNEL);
if (!onecell)
return -ENOMEM;
onecell->num = BCM2835_AUX_CLOCK_COUNT;
gate = reg + BCM2835_AUXENB;
onecell->hws[BCM2835_AUX_CLOCK_UART] =
clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
onecell);
}
static const struct of_device_id bcm2835_aux_clk_of_match[] = {
{ .compatible = "brcm,bcm2835-aux", },
{},
};
MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
static struct platform_driver bcm2835_aux_clk_driver = {
.driver = {
.name = "bcm2835-aux-clk",
.of_match_table = bcm2835_aux_clk_of_match,
},
.probe = bcm2835_aux_clk_probe,
};
builtin_platform_driver(bcm2835_aux_clk_driver);
MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
MODULE_LICENSE("GPL v2");
|
