2 * Copyright (C) 2015 Broadcom
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.
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.
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>
21 #define BCM2835_AUXIRQ 0x00
22 #define BCM2835_AUXENB 0x04
24 static int bcm2835_aux_clk_probe(struct platform_device
*pdev
)
26 struct device
*dev
= &pdev
->dev
;
27 struct clk_hw_onecell_data
*onecell
;
29 struct clk
*parent_clk
;
31 void __iomem
*reg
, *gate
;
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
);
38 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
39 reg
= devm_ioremap_resource(dev
, res
);
43 onecell
= devm_kmalloc(dev
,
44 struct_size(onecell
, hws
,
45 BCM2835_AUX_CLOCK_COUNT
),
49 onecell
->num
= BCM2835_AUX_CLOCK_COUNT
;
51 gate
= reg
+ BCM2835_AUXENB
;
52 onecell
->hws
[BCM2835_AUX_CLOCK_UART
] =
53 clk_hw_register_gate(dev
, "aux_uart", parent
, 0, gate
, 0, 0, NULL
);
55 onecell
->hws
[BCM2835_AUX_CLOCK_SPI1
] =
56 clk_hw_register_gate(dev
, "aux_spi1", parent
, 0, gate
, 1, 0, NULL
);
58 onecell
->hws
[BCM2835_AUX_CLOCK_SPI2
] =
59 clk_hw_register_gate(dev
, "aux_spi2", parent
, 0, gate
, 2, 0, NULL
);
61 return of_clk_add_hw_provider(pdev
->dev
.of_node
, of_clk_hw_onecell_get
,
65 static const struct of_device_id bcm2835_aux_clk_of_match
[] = {
66 { .compatible
= "brcm,bcm2835-aux", },
69 MODULE_DEVICE_TABLE(of
, bcm2835_aux_clk_of_match
);
71 static struct platform_driver bcm2835_aux_clk_driver
= {
73 .name
= "bcm2835-aux-clk",
74 .of_match_table
= bcm2835_aux_clk_of_match
,
76 .probe
= bcm2835_aux_clk_probe
,
78 builtin_platform_driver(bcm2835_aux_clk_driver
);
80 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
81 MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
82 MODULE_LICENSE("GPL v2");