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For SoCs like gs101 that need a special regmap, register this with of_syscon_register_regmap api, so it can be returned by syscon_regmap_lookup_by_phandle() and friends. For SoCs that don't require a custom regmap, revert back to syscon creating the mmio regmap rather than duplicating the logic here. exynos_get_pmu_regmap_by_phandle() api is also updated to retrieve the regmap via syscon. The exynos_get_pmu_regmap_by_phandle() api is kept around until fw_devlink support for syscon property is added for the pinctrl-samsung driver that also runs at postcore_initcall level. All other exynos client drivers can revert back to syscon_regmap_lookup_by_phandle(). 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/20240621115544.1655458-3-peter.griffin@linaro.org Signed-off-by: Lee Jones <lee@kernel.org>