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- /* SPDX-License-Identifier: GPL-2.0 OR MIT */
- /* Copyright 2022 Innovative Advantage Inc. */
- #ifndef _LINUX_MFD_OCELOT_H
- #define _LINUX_MFD_OCELOT_H
- #include <linux/err.h>
- #include <linux/errno.h>
- #include <linux/ioport.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- #include <linux/types.h>
- struct resource;
- static inline struct regmap *
- ocelot_regmap_from_resource_optional(struct platform_device *pdev,
- unsigned int index,
- const struct regmap_config *config)
- {
- struct device *dev = &pdev->dev;
- struct resource *res;
- void __iomem *regs;
- /*
- * Don't use _get_and_ioremap_resource() here, since that will invoke
- * prints of "invalid resource" which will simply add confusion.
- */
- res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- if (res) {
- regs = devm_ioremap_resource(dev, res);
- if (IS_ERR(regs))
- return ERR_CAST(regs);
- return devm_regmap_init_mmio(dev, regs, config);
- }
- /*
- * Fall back to using REG and getting the resource from the parent
- * device, which is possible in an MFD configuration
- */
- if (dev->parent) {
- res = platform_get_resource(pdev, IORESOURCE_REG, index);
- if (!res)
- return NULL;
- return dev_get_regmap(dev->parent, res->name);
- }
- return NULL;
- }
- static inline struct regmap *
- ocelot_regmap_from_resource(struct platform_device *pdev, unsigned int index,
- const struct regmap_config *config)
- {
- struct regmap *map;
- map = ocelot_regmap_from_resource_optional(pdev, index, config);
- return map ?: ERR_PTR(-ENOENT);
- }
- #endif
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