[PATCH v5 1/4] dt-bindings: clock: google,gs101-clock: add samsung,sysreg property as required

[André Draszik]

On Fri, 2025-11-14 at 14:16 +0000, Peter Griffin wrote:
> 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 at linaro.org>
> ---
> Changes in v5:
> - Invert the test for google,gs101-cmu-top (Andre)

Reviewed-by: André Draszik <andre.draszik at linaro.org>