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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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