Hi Krzysztof,

On Sun, 21 Dec 2025 at 13:26, Krzysztof Kozlowski [off-list ref] wrote:

On 20/12/2025 10:05, Peter Griffin wrote:

quoted

Each CMU (with the exception of cmu_top) has a corresponding sysreg bank
that contains the BUSCOMPONENT_DRCG_EN and optional MEMCLK registers.
The BUSCOMPONENT_DRCG_EN register enables dynamic root clock gating of
bus components and MEMCLK gates the sram clock.

Now the clock driver supports automatic clock mode, to fully enable dynamic
root clock gating it is required to configure these registers. Update the
bindings documentation so that all CMUs (with the exception of
gs101-cmu-top) have samsung,sysreg as a required property.

Note this is NOT an ABI break, as if the property isn't specified the
clock driver will fallback to the current behaviour of not initializing
the registers. The system still boots, but bus components won't benefit
from dynamic root clock gating and dynamic power will be higher (which has
been the case until now anyway).

Additionally update the DT example to included the correct CMU size as
registers in that region are used for automatic clock mode.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
---
Changes in v5:
- Invert the test for google,gs101-cmu-top (Andre)

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Apologies, your tag should have been added.... got kind of sidetracked
bisecting the linux-next regression with the serial console and then
forgot to apply it.

Peter.