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