[PATCH 1/2] mfd: syscon: add of_syscon_register_regmap() API

[André Draszik]

On Fri, 2024-06-14 at 15:04 +0100, Peter Griffin wrote:
> 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 at linaro.org>

With this series, the exynos5 usb phy driver works on gs101 without
having to patch it to use exynos_get_pmu_regmap_by_phandle() instead
of the standard syscon_regmap_lookup_by_phandle():

Tested-by: André Draszik <andre.draszik at linaro.org>