1 | /* SPDX-License-Identifier: GPL-2.0 OR MIT */ |
2 | /* Copyright 2022 Innovative Advantage Inc. */ |
3 | |
4 | #ifndef _LINUX_MFD_OCELOT_H |
5 | #define _LINUX_MFD_OCELOT_H |
6 | |
7 | #include <linux/err.h> |
8 | #include <linux/errno.h> |
9 | #include <linux/ioport.h> |
10 | #include <linux/platform_device.h> |
11 | #include <linux/regmap.h> |
12 | #include <linux/types.h> |
13 | |
14 | struct resource; |
15 | |
16 | static inline struct regmap * |
17 | ocelot_regmap_from_resource_optional(struct platform_device *pdev, |
18 | unsigned int index, |
19 | const struct regmap_config *config) |
20 | { |
21 | struct device *dev = &pdev->dev; |
22 | struct resource *res; |
23 | void __iomem *regs; |
24 | |
25 | /* |
26 | * Don't use _get_and_ioremap_resource() here, since that will invoke |
27 | * prints of "invalid resource" which will simply add confusion. |
28 | */ |
29 | res = platform_get_resource(pdev, IORESOURCE_MEM, index); |
30 | if (res) { |
31 | regs = devm_ioremap_resource(dev, res); |
32 | if (IS_ERR(ptr: regs)) |
33 | return ERR_CAST(ptr: regs); |
34 | return devm_regmap_init_mmio(dev, regs, config); |
35 | } |
36 | |
37 | /* |
38 | * Fall back to using REG and getting the resource from the parent |
39 | * device, which is possible in an MFD configuration |
40 | */ |
41 | if (dev->parent) { |
42 | res = platform_get_resource(pdev, IORESOURCE_REG, index); |
43 | if (!res) |
44 | return NULL; |
45 | |
46 | return dev_get_regmap(dev: dev->parent, name: res->name); |
47 | } |
48 | |
49 | return NULL; |
50 | } |
51 | |
52 | static inline struct regmap * |
53 | ocelot_regmap_from_resource(struct platform_device *pdev, unsigned int index, |
54 | const struct regmap_config *config) |
55 | { |
56 | struct regmap *map; |
57 | |
58 | map = ocelot_regmap_from_resource_optional(pdev, index, config); |
59 | return map ?: ERR_PTR(error: -ENOENT); |
60 | } |
61 | |
62 | #endif |
63 | |