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mfd: syscon: Add of_syscon_register_regmap() API

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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>
This commit is contained in:
Peter Griffin
2024-06-21 12:55:43 +01:00
committed by Lee Jones
parent 1613e604df
commit 769cb63166
2 changed files with 56 additions and 0 deletions
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include/linux/mfd/syscon.h
+8
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@@ -28,6 +28,8 @@ struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
unsigned int *out_args);
struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
const char *property);
int of_syscon_register_regmap(struct device_node *np,
struct regmap *regmap);
#else
static inline struct regmap *device_node_to_regmap(struct device_node *np)
{
@@ -67,6 +69,12 @@ static inline struct regmap *syscon_regmap_lookup_by_phandle_optional(
return NULL;
}
static inline int of_syscon_register_regmap(struct device_node *np,
struct regmap *regmap)
{
return -EOPNOTSUPP;
}
#endif
#endif /* __LINUX_MFD_SYSCON_H__ */