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Several ocelot-related modules are designed for MMIO / regmaps. As such, they often use a combination of devm_platform_get_and_ioremap_resource() and devm_regmap_init_mmio(). Operating in an MFD might be different, in that it could be memory mapped, or it could be SPI, I2C... In these cases a fallback to use IORESOURCE_REG instead of IORESOURCE_MEM becomes necessary. When this happens, there's redundant logic that needs to be implemented in every driver. In order to avoid this redundancy, utilize a single function that, if the MFD scenario is enabled, will perform this fallback logic. Signed-off-by: Colin Foster <colin.foster@in-advantage.com> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20220905162132.2943088-2-colin.foster@in-advantage.com
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/* Copyright 2022 Innovative Advantage Inc. */
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#ifndef _LINUX_MFD_OCELOT_H
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#define _LINUX_MFD_OCELOT_H
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/types.h>
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struct resource;
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static inline struct regmap *
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ocelot_regmap_from_resource_optional(struct platform_device *pdev,
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unsigned int index,
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const struct regmap_config *config)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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void __iomem *regs;
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/*
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* Don't use _get_and_ioremap_resource() here, since that will invoke
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* prints of "invalid resource" which will simply add confusion.
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*/
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res = platform_get_resource(pdev, IORESOURCE_MEM, index);
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if (res) {
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regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(regs))
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return ERR_CAST(regs);
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return devm_regmap_init_mmio(dev, regs, config);
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}
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/*
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* Fall back to using REG and getting the resource from the parent
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* device, which is possible in an MFD configuration
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*/
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if (dev->parent) {
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res = platform_get_resource(pdev, IORESOURCE_REG, index);
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if (!res)
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return NULL;
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return dev_get_regmap(dev->parent, res->name);
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}
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return NULL;
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}
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static inline struct regmap *
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ocelot_regmap_from_resource(struct platform_device *pdev, unsigned int index,
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const struct regmap_config *config)
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{
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struct regmap *map;
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map = ocelot_regmap_from_resource_optional(pdev, index, config);
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return map ?: ERR_PTR(-ENOENT);
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}
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#endif
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