2 * Copyright (C) 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
5 * SPDX-License-Identifier: GPL-2.0+
13 #include <dm/device-internal.h>
16 #include <linux/err.h>
18 struct regmap
*syscon_get_regmap(struct udevice
*dev
)
20 struct syscon_uc_info
*priv
;
22 if (device_get_uclass_id(dev
) != UCLASS_SYSCON
)
23 return ERR_PTR(-ENOEXEC
);
24 priv
= dev_get_uclass_priv(dev
);
28 static int syscon_pre_probe(struct udevice
*dev
)
30 struct syscon_uc_info
*priv
= dev_get_uclass_priv(dev
);
33 * With OF_PLATDATA we really have no way of knowing the format of
34 * the device-specific platform data. So we assume that it starts with
35 * a 'reg' member, and this holds a single address and size. Drivers
36 * using OF_PLATDATA will need to ensure that this is true.
38 #if CONFIG_IS_ENABLED(OF_PLATDATA)
39 struct syscon_base_platdata
*plat
= dev_get_platdata(dev
);
41 return regmap_init_mem_platdata(dev
, plat
->reg
, ARRAY_SIZE(plat
->reg
),
44 return regmap_init_mem(dev
, &priv
->regmap
);
48 int syscon_get_by_driver_data(ulong driver_data
, struct udevice
**devp
)
55 ret
= uclass_get(UCLASS_SYSCON
, &uc
);
58 uclass_foreach_dev(dev
, uc
) {
59 if (dev
->driver_data
== driver_data
) {
61 return device_probe(dev
);
68 struct regmap
*syscon_get_regmap_by_driver_data(ulong driver_data
)
70 struct syscon_uc_info
*priv
;
74 ret
= syscon_get_by_driver_data(driver_data
, &dev
);
77 priv
= dev_get_uclass_priv(dev
);
82 void *syscon_get_first_range(ulong driver_data
)
86 map
= syscon_get_regmap_by_driver_data(driver_data
);
89 return regmap_get_range(map
, 0);
92 UCLASS_DRIVER(syscon
) = {
95 .per_device_auto_alloc_size
= sizeof(struct syscon_uc_info
),
96 .pre_probe
= syscon_pre_probe
,
99 static const struct udevice_id generic_syscon_ids
[] = {
100 { .compatible
= "syscon" },
104 U_BOOT_DRIVER(generic_syscon
) = {
107 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
108 .bind
= dm_scan_fdt_dev
,
110 .of_match
= generic_syscon_ids
,