linux-kernel - Re: (subset) [PATCH v7 0/4] Implement hardware automatic clock gating (HWACG) for gs101

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Message-ID: <4fff2e56-600e-49a8-b993-aa7fa50f7fdf@kernel.org>
Date: Mon, 22 Dec 2025 12:51:03 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>,
 André Draszik <andre.draszik@...aro.org>,
 Tudor Ambarus <tudor.ambarus@...aro.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Sam Protsenko <semen.protsenko@...aro.org>,
 Sylwester Nawrocki <s.nawrocki@...sung.com>,
 Chanwoo Choi <cw00.choi@...sung.com>,
 Peter Griffin <peter.griffin@...aro.org>
Cc: Will McVicker <willmcvicker@...gle.com>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
 kernel-team@...roid.com
Subject: Re: (subset) [PATCH v7 0/4] Implement hardware automatic clock gating
 (HWACG) for gs101

On 22/12/2025 12:50, Krzysztof Kozlowski wrote:
> 
> On Mon, 22 Dec 2025 10:22:11 +0000, Peter Griffin wrote:
>> This series addresses an issue with Samsung Exynos based upstream clock driver
>> whereby the upstream clock driver sets all the clock gates into "manual mode"
>> (which uses a bit that is documented as reserved in the gate registers).
>>
>> Another issue with the current "manual clock gating" approach upstream is
>> there are many bus/interconnect clocks whose relationships to the IPs
>> are not well documented or defined in the specs. When adding a new CMU until
>> now we have tried to label these clocks appropriately with CLK_IS_CRITICAL and
>> CLK_IGNORE_UNUSED but doing so is both error prone and time consuming. If
>> your lucky disabling a critical bus clock causes an immediate hang. Other
>> clocks however aren't so obvious and show up through random instability
>> some period of time later.
>>
>> [...]
> 
> Applied, thanks!
> 
> [2/4] arm64: dts: exynos: gs101: add samsung,sysreg property to CMU nodes
>       https://git.kernel.org/krzk/linux/c/01272f05aae5f6aca4337eb52e6b9290ce12e9f7
> 

Above is incomplete, all applied.

Best regards,
Krzysztof