1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2015 Broadcom
4 */
5
6#include <linux/clk.h>
7#include <linux/clk-provider.h>
8#include <linux/io.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <dt-bindings/clock/bcm2835-aux.h>
12
13#define BCM2835_AUXIRQ		0x00
14#define BCM2835_AUXENB		0x04
15
16static int bcm2835_aux_clk_probe(struct platform_device *pdev)
17{
18	struct device *dev = &pdev->dev;
19	struct clk_hw_onecell_data *onecell;
20	const char *parent;
21	struct clk *parent_clk;
22	void __iomem *reg, *gate;
23
24	parent_clk = devm_clk_get(dev, NULL);
25	if (IS_ERR(parent_clk))
26		return PTR_ERR(parent_clk);
27	parent = __clk_get_name(parent_clk);
28
29	reg = devm_platform_ioremap_resource(pdev, 0);
30	if (IS_ERR(reg))
31		return PTR_ERR(reg);
32
33	onecell = devm_kmalloc(dev,
34			       struct_size(onecell, hws,
35					   BCM2835_AUX_CLOCK_COUNT),
36			       GFP_KERNEL);
37	if (!onecell)
38		return -ENOMEM;
39	onecell->num = BCM2835_AUX_CLOCK_COUNT;
40
41	gate = reg + BCM2835_AUXENB;
42	onecell->hws[BCM2835_AUX_CLOCK_UART] =
43		clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
44
45	onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
46		clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
47
48	onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
49		clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
50
51	return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
52				      onecell);
53}
54
55static const struct of_device_id bcm2835_aux_clk_of_match[] = {
56	{ .compatible = "brcm,bcm2835-aux", },
57	{},
58};
59MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
60
61static struct platform_driver bcm2835_aux_clk_driver = {
62	.driver = {
63		.name = "bcm2835-aux-clk",
64		.of_match_table = bcm2835_aux_clk_of_match,
65	},
66	.probe          = bcm2835_aux_clk_probe,
67};
68builtin_platform_driver(bcm2835_aux_clk_driver);
69
70MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
71MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
72