Re: [PATCH 4/5] clk: qcom: Add camera clock controller driver for SM8150

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On 3/8/2024 4:29 PM, Bryan O'Donoghue wrote:
On 08/03/2024 10:58, Bryan O'Donoghue wrote:
On 08/03/2024 10:46, Satya Priya Kakitapalli (Temp) wrote:

Not if you mark it critical


Marking the clock as critical keeps the associated power domain always-on which impacts power. For this reason we are not using CLK_IS_CRITICAL and instead making them always on from probe.

How does the clock do anything _useful_ if the power-domain gets switched off ?

---
bod

i.e. the clock can't be running "always-on" if it has no power..


If BIT(0) is set from probe, during any active usecase, the clock gets turned ON automatically when the power domain is turned ON.

But when we use CLK_IS_CRITICAL flag, the framework keeps the power domain ON and doesn't let the power domain to turn off even when there is no active usecase.






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