linux-kernel - Re: [PATCH v3 1/2] mfd: syscon: add of_syscon_register

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Date: Fri, 21 Jun 2024 16:56:13 -0700
From: William McVicker <willmcvicker@...gle.com>
To: Peter Griffin <peter.griffin@...aro.org>
Cc: lee@...nel.org, arnd@...db.de, krzk@...nel.org, alim.akhtar@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	tudor.ambarus@...aro.org, andre.draszik@...aro.org,
	saravanak@...gle.com, semen.protsenko@...aro.org,
	kernel-team@...roid.com
Subject: Re: [PATCH v3 1/2] mfd: syscon: add of_syscon_register_regmap() API

On 06/21/2024, 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>
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>

Tested-by: Will McVicker <willmcvicker@...gle.com>

[...]

Thanks Peter! I've tested the patch series on my Pixel 6 Pro and all is working
well. I verified all the modularized drivers load and probe successfully:

root@...gle-gs:~# lsmod
Module                  Size  Used by
at24                   24576  0
dwc3_exynos            12288  0
i2c_exynos5            28672  0
phy_exynos_ufs         20480  1
ufs_exynos             32768  0
phy_exynos5_usbdrd     36864  2
s3c2410_wdt            24576  0
arm_dsu_pmu            24576  0

Thanks,
Will