linux-kernel - Re: [PATCH v2 2/3] mfd: syscon: Remove the platform driver support

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Message-ID: <Z2HS2Y0nGBMgvz8U@google.com>
Date: Tue, 17 Dec 2024 11:36:57 -0800
From: William McVicker <willmcvicker@...gle.com>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: Lee Jones <lee@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Pankaj Dubey <pankaj.dubey@...sung.com>,
	Heiko Stuebner <heiko@...ech.de>, Liviu Dudau <liviu.dudau@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	John Madieu <john.madieu.xa@...renesas.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] mfd: syscon: Remove the platform driver support

On 12/17/2024, Rob Herring (Arm) wrote:
> The platform driver is dead code. It is not used by DT platforms since
> commit bdb0066df96e ("mfd: syscon: Decouple syscon interface from
> platform devices") which said:
> 
>     For non-DT based platforms, this patch keeps syscon platform driver
>     structure so that syscon can be probed and such non-DT based drivers
>     can use syscon_regmap_lookup_by_pdev API and access regmap handles.
>     Once all users of "syscon_regmap_lookup_by_pdev" migrated to DT based,
>     we can completely remove platform driver of syscon, and keep only helper
>     functions to get regmap handles.
> 
> The last user of syscon_regmap_lookup_by_pdevname() was removed in 2018.
> syscon_regmap_lookup_by_pdevname() was then removed in 2019, but that
> commit failed to remove the rest of the platform driver.
> 
> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>

I verified this works on my Pixel 6. Thanks!

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

Thanks,
Will