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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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769cb63166
The of_syscon_register_regmap() API allows an externally created regmap to be registered with syscon. This regmap can then be returned to client drivers using the syscon_regmap_lookup_by_phandle() APIs. The API is used by platforms where mmio access to the syscon registers is not possible, and a underlying soc driver like exynos-pmu provides a SoC specific regmap that can issue a SMC or hypervisor call to write the register. This approach keeps the SoC complexities out of syscon, but allows common drivers such as syscon-poweroff, syscon-reboot and friends that are used by many SoCs already to be re-used. Signed-off-by: Peter Griffin <peter.griffin@linaro.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Tested-by: Will McVicker <willmcvicker@google.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20240621115544.1655458-2-peter.griffin@linaro.org Signed-off-by: Lee Jones <lee@kernel.org>
81 lines
2.0 KiB
C
81 lines
2.0 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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struct regmap *device_node_to_regmap(struct device_node *np);
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struct regmap *syscon_node_to_regmap(struct device_node *np);
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struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
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struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
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const char *property);
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struct regmap *syscon_regmap_lookup_by_phandle_args(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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struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
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const char *property);
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int of_syscon_register_regmap(struct device_node *np,
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struct regmap *regmap);
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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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static inline int of_syscon_register_regmap(struct device_node *np,
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struct regmap *regmap)
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{
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return -EOPNOTSUPP;
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}
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#endif
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#endif /* __LINUX_MFD_SYSCON_H__ */
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