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(regs))
33 return ERR_CAST(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->parent, 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(-ENOENT);
60 }
61
62 #endif
63
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