linux-kernel - Re: [RFC v3 05/18] pmdomain: thead: Add power-domain driver for TH1520

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Message-ID: <4c8a5979-c0e0-460f-9809-4cf8b10e40ce@samsung.com>
Date: Tue, 28 Jan 2025 16:59:42 +0100
From: Michal Wilczynski <m.wilczynski@...sung.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, drew@...7.com, guoren@...nel.org,
	wefu@...hat.com, jassisinghbrar@...il.com, paul.walmsley@...ive.com,
	palmer@...belt.com, aou@...s.berkeley.edu, frank.binns@...tec.com,
	matt.coster@...tec.com, maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
	jszhang@...nel.org, p.zabel@...gutronix.de, m.szyprowski@...sung.com,
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, linux-pm@...r.kernel.org
Subject: Re: [RFC v3 05/18] pmdomain: thead: Add power-domain driver for
 TH1520



On 1/21/25 10:55, Ulf Hansson wrote:
> On Mon, 20 Jan 2025 at 18:21, Michal Wilczynski
> <m.wilczynski@...sung.com> wrote:
>>
>> The T-Head TH1520 SoC contains multiple power islands that can be
>> programmatically turned on and off using the AON (Always-On) protocol
>> and a hardware mailbox [1]. The relevant mailbox driver has already been
>> merged into the mainline kernel in commit 5d4d263e1c6b ("mailbox:
>> Introduce support for T-head TH1520 Mailbox driver");
>>
>> This commit introduces a power-domain driver for the TH1520 SoC, which
>> is using AON firmware protocol to communicate with E902 core through the
>> hardware mailbox. This way it can send power on/off commands to the E902
>> core.
>>
>> Link: https://protect2.fireeye.com/v1/url?k=aca9147a-cd220149-aca89f35-000babff9bb7-dfbb0fd97ae06334&q=1&e=7a720b7b-4489-48b9-b901-404180e7bc23&u=https%3A%2F%2Fopenbeagle.org%2Fbeaglev-ahead%2Fbeaglev-ahead%2F-%2Fblob%2Fmain%2Fdocs%2FTH1520%2520System%2520User%2520Manual.pdf [1]
>>
>> Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
> 
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> 
> I guess this depends on patch2 and patch3. Not sure what's the best
> way to merge this, but I can certainly funnel them all three through
> my pmdomain tree if that sounds feasible. Just let me know.
> 
> Kind regards
> Uffe

Thanks Ulf. I've made some changes based on my discussion with
Krzysztof, so I'll hold off on adding your Reviewed-by tag until v4.
Once we've addressed any remaining comments, it would be great if you
could take the firmware and power-domain patches through your tree.

> 
>> ---