forked from mirrors/linux
86b9d170da
This adds syscon_regmap_lookup_by_phandle_optional() function to get an optional regmap. It behaves the same as syscon_regmap_lookup_by_phandle() except where there is no regmap phandle. In this case, instead of returning -ENODEV, the function returns NULL. This makes error checking simpler when the regmap phandle is optional. Suggested-by: Nicolas Boichat <drinkcat@chromium.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Lee Jones <lee.jones@linaro.org>
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* System Control Driver
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*
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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* Copyright (C) 2012 Linaro Ltd.
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*
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* Author: Dong Aisheng <dong.aisheng@linaro.org>
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*/
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#ifndef __LINUX_MFD_SYSCON_H__
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#define __LINUX_MFD_SYSCON_H__
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#include <linux/err.h>
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#include <linux/errno.h>
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struct device_node;
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#ifdef CONFIG_MFD_SYSCON
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extern struct regmap *device_node_to_regmap(struct device_node *np);
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extern struct regmap *syscon_node_to_regmap(struct device_node *np);
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extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
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extern struct regmap *syscon_regmap_lookup_by_phandle(
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struct device_node *np,
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const char *property);
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extern struct regmap *syscon_regmap_lookup_by_phandle_args(
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struct device_node *np,
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const char *property,
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int arg_count,
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unsigned int *out_args);
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extern struct regmap *syscon_regmap_lookup_by_phandle_optional(
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struct device_node *np,
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const char *property);
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#else
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static inline struct regmap *device_node_to_regmap(struct device_node *np)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct regmap *syscon_regmap_lookup_by_phandle(
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struct device_node *np,
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const char *property)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct regmap *syscon_regmap_lookup_by_phandle_args(
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struct device_node *np,
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const char *property,
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int arg_count,
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unsigned int *out_args)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct regmap *syscon_regmap_lookup_by_phandle_optional(
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struct device_node *np,
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const char *property)
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{
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return NULL;
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}
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#endif
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#endif /* __LINUX_MFD_SYSCON_H__ */
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