[PATCH v3 3/6] clk: imx: imx8mp: Add audiomix block control

[Marek Vasut]

On 8/4/22 11:13, Peng Fan wrote:
>> Subject: Re: [PATCH v3 3/6] clk: imx: imx8mp: Add audiomix block control
>>
>> On 6/28/22 09:44, Abel Vesa wrote:
>>> On 22-06-27 18:23:33, Marek Vasut wrote:
>>>> On 6/27/22 17:35, Abel Vesa wrote:
>>>>> On 22-06-25 03:32:32, Marek Vasut wrote:
>>>>>> Unlike the other block control IPs in i.MX8M, the audiomix is
>>>>>> mostly a series of clock gates and muxes. Model it as a large
>>>>>> static table of gates and muxes with one exception, which is the
>>>>>> PLL14xx . The PLL14xx SAI PLL has to be registered separately.
>>>>>>
>>>>>
>>>>> Again, there is a chance that the blk-ctrl driver might disable the
>>>>> PD from under this.
>>>>
>>>> Can you elaborate a bit more on this ? How/why do you think so ?
>>>
>>> At some point, the PDs from the Audiomix IP block will be added to the
>>> drivers/soc/imx/imx8mp-blk-ctrl.c. Then, you'll have 2 drivers with
>>> the same address range and the imx8mp-blk-ctrl also has runtime PM
>> enabled.
>>
>> Why would the PDs be added into the block control driver?
>>
>> The audiomix is purely a clock mux driver, not really a block control driver
>> providing PDs of its own.
> 
> I recalled that with with blk-ctrl working as clock provider, there is dead lock
> issue, if the blk-ctrl node has a power-domain entry. Not very sure.

How can I verify that ? Lockdep ?

I run this series for months and haven't seen a lock up or splat.