Il 24/06/25 18:02, Krzysztof Kozlowski ha scritto:

On 24/06/2025 16:32, Laura Nao wrote:

quoted

+  '#reset-cells':
+    const: 1
+    description:
+      Reset lines for PEXTP0/1 and UFS blocks.
+
+  mediatek,hardware-voter:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      On the MT8196 SoC, a Hardware Voter (HWV) backed by a fixed-function
+      MCU manages clock and power domain control across the AP and other
+      remote processors. By aggregating their votes, it ensures clocks are
+      safely enabled/disabled and power domains are active before register
+      access.

Resource voting is not via any phandle, but either interconnects or
required opps for power domain.

Sorry, I'm not sure who is actually misunderstanding what, here... let me try to
explain the situation:

This is effectively used as a syscon - as in, the clock controllers need to perform
MMIO R/W on both the clock controller itself *and* has to place a vote to the clock
controller specific HWV register.

This is done for MUX-GATE and GATE clocks, other than for power domains.

Note that the HWV system is inside of the power domains controller, and it's split
on a per hardware macro-block basis (as per usual MediaTek hardware layout...).

The HWV, therefore, does *not* vote for clock *rates* (so, modeling OPPs would be
a software quirk, I think?), does *not* manage bandwidth (and interconnect is for
voting BW only?), and is just a "switch to flip".

Is this happening because the description has to be improved and creating some
misunderstanding, or is it because we are underestimating and/or ignoring something
here?

Cheers,
Angelo

I already commented on this, so don't send v3 with the same.

Best regards,
Krzysztof