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
bcm2835_aux_clk_probe(struct platform_device * pdev)16 static 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
55 static const struct of_device_id bcm2835_aux_clk_of_match[] = {
56 { .compatible = "brcm,bcm2835-aux", },
57 {},
58 };
59 MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
60
61 static 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 };
68 builtin_platform_driver(bcm2835_aux_clk_driver);
69
70 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
71 MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
72