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Merge tag 'regulator-fix-v4.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel...
[karo-tx-linux.git] / drivers / memory / atmel-sdramc.c
1 /*
2  * Atmel (Multi-port DDR-)SDRAM Controller driver
3  *
4  * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
5  *
6  * Copyright (C) 2014 Atmel
7  *
8  * This program is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation version 2 of the License.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
19  *
20  */
21
22 #include <linux/clk.h>
23 #include <linux/err.h>
24 #include <linux/kernel.h>
25 #include <linux/init.h>
26 #include <linux/of_platform.h>
27 #include <linux/platform_device.h>
28
29 struct at91_ramc_caps {
30         bool has_ddrck;
31         bool has_mpddr_clk;
32 };
33
34 static const struct at91_ramc_caps at91rm9200_caps = { };
35
36 static const struct at91_ramc_caps at91sam9g45_caps = {
37         .has_ddrck = 1,
38         .has_mpddr_clk = 0,
39 };
40
41 static const struct at91_ramc_caps sama5d3_caps = {
42         .has_ddrck = 1,
43         .has_mpddr_clk = 1,
44 };
45
46 static const struct of_device_id atmel_ramc_of_match[] = {
47         { .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, },
48         { .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, },
49         { .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, },
50         { .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, },
51         {},
52 };
53
54 static int atmel_ramc_probe(struct platform_device *pdev)
55 {
56         const struct at91_ramc_caps *caps;
57         struct clk *clk;
58
59         caps = of_device_get_match_data(&pdev->dev);
60
61         if (caps->has_ddrck) {
62                 clk = devm_clk_get(&pdev->dev, "ddrck");
63                 if (IS_ERR(clk))
64                         return PTR_ERR(clk);
65                 clk_prepare_enable(clk);
66         }
67
68         if (caps->has_mpddr_clk) {
69                 clk = devm_clk_get(&pdev->dev, "mpddr");
70                 if (IS_ERR(clk)) {
71                         pr_err("AT91 RAMC: couldn't get mpddr clock\n");
72                         return PTR_ERR(clk);
73                 }
74                 clk_prepare_enable(clk);
75         }
76
77         return 0;
78 }
79
80 static struct platform_driver atmel_ramc_driver = {
81         .probe          = atmel_ramc_probe,
82         .driver         = {
83                 .name   = "atmel-ramc",
84                 .of_match_table = atmel_ramc_of_match,
85         },
86 };
87
88 builtin_platform_driver(atmel_ramc_driver);