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gerrit-public.fairphone.software / kernel / msm-4.19 / fb02915f47181e824339d91f8e385fd4bd746d6a / . / drivers / mfd / atmel-hlcdc.c
blob: cfd58f4cc5c349c5f98068d98a7972da5e12d21d [file] [log] [blame]
Boris Brezillon2c86e9f2014-10-06 15:48:43 +0200[diff] [blame]1/*
2 * Copyright (C) 2014 Free Electrons
3 * Copyright (C) 2014 Atmel
4 *
5 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/clk.h>
21#include <linux/mfd/atmel-hlcdc.h>
22#include <linux/mfd/core.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/regmap.h>
26
27#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)
28
29static const struct mfd_cell atmel_hlcdc_cells[] = {
30 {
31 .name = "atmel-hlcdc-pwm",
32 .of_compatible = "atmel,hlcdc-pwm",
33 },
34 {
35 .name = "atmel-hlcdc-dc",
36 .of_compatible = "atmel,hlcdc-display-controller",
37 },
38};
39
40static const struct regmap_config atmel_hlcdc_regmap_config = {
41 .reg_bits = 32,
42 .val_bits = 32,
43 .reg_stride = 4,
44 .max_register = ATMEL_HLCDC_REG_MAX,
45};
46
47static int atmel_hlcdc_probe(struct platform_device *pdev)
48{
49 struct device *dev = &pdev->dev;
50 struct atmel_hlcdc *hlcdc;
51 struct resource *res;
52 void __iomem *regs;
53
54 hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
55 if (!hlcdc)
56 return -ENOMEM;
57
58 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
59 regs = devm_ioremap_resource(dev, res);
60 if (IS_ERR(regs))
61 return PTR_ERR(regs);
62
63 hlcdc->irq = platform_get_irq(pdev, 0);
64 if (hlcdc->irq < 0)
65 return hlcdc->irq;
66
67 hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
68 if (IS_ERR(hlcdc->periph_clk)) {
69 dev_err(dev, "failed to get peripheral clock\n");
70 return PTR_ERR(hlcdc->periph_clk);
71 }
72
73 hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
74 if (IS_ERR(hlcdc->sys_clk)) {
75 dev_err(dev, "failed to get system clock\n");
76 return PTR_ERR(hlcdc->sys_clk);
77 }
78
79 hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
80 if (IS_ERR(hlcdc->slow_clk)) {
81 dev_err(dev, "failed to get slow clock\n");
82 return PTR_ERR(hlcdc->slow_clk);
83 }
84
85 hlcdc->regmap = devm_regmap_init_mmio(dev, regs,
86 &atmel_hlcdc_regmap_config);
87 if (IS_ERR(hlcdc->regmap))
88 return PTR_ERR(hlcdc->regmap);
89
90 dev_set_drvdata(dev, hlcdc);
91
92 return mfd_add_devices(dev, -1, atmel_hlcdc_cells,
93 ARRAY_SIZE(atmel_hlcdc_cells),
94 NULL, 0, NULL);
95}
96
97static int atmel_hlcdc_remove(struct platform_device *pdev)
98{
99 mfd_remove_devices(&pdev->dev);
100
101 return 0;
102}
103
104static const struct of_device_id atmel_hlcdc_match[] = {
105 { .compatible = "atmel,sama5d3-hlcdc" },
106 { /* sentinel */ },
107};
108
109static struct platform_driver atmel_hlcdc_driver = {
110 .probe = atmel_hlcdc_probe,
111 .remove = atmel_hlcdc_remove,
112 .driver = {
113 .name = "atmel-hlcdc",
114 .of_match_table = atmel_hlcdc_match,
115 },
116};
117module_platform_driver(atmel_hlcdc_driver);
118
119MODULE_ALIAS("platform:atmel-hlcdc");
120MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
121MODULE_DESCRIPTION("Atmel HLCDC driver");
122MODULE_LICENSE("GPL v2");