linux-kernel - Re: [PATCH 1/2] mfd: syscon: add of_syscon_register

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Date: Mon, 17 Jun 2024 10:35:03 +0100
From: André Draszik <andre.draszik@...aro.org>
To: Peter Griffin <peter.griffin@...aro.org>, lee@...nel.org, arnd@...db.de,
  krzk@...nel.org, alim.akhtar@...sung.com
Cc: linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
  linux-kernel@...r.kernel.org, tudor.ambarus@...aro.org,
 saravanak@...gle.com,  willmcvicker@...gle.com, semen.protsenko@...aro.org,
 kernel-team@...roid.com
Subject: Re: [PATCH 1/2] mfd: syscon: add of_syscon_register_regmap() API

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@...aro.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@...aro.org>