[Letux-kernel] [PATCH v7 01/12] dt-bindings: add img, pvrsgx.yaml for Imagination GPUs
H. Nikolaus Schaller
hns at goldelico.com
Fri May 15 09:58:31 CEST 2020
> Am 03.05.2020 um 17:01 schrieb Tony Lindgren <tony at atomide.com>:
> * Paul Cercueil <paul at crapouillou.net> [200503 14:19]:
>> You have a new SoC with a SGX, and you only need to enable one clock to get
>> it to work. So you create a devicetree node which receives only one clock.
>> Turns out, that the bootloader was enabling the other 3 clocks, and since
>> the last release, it doesn't anymore. You're left with having to support a
>> broken devicetree.
>> That's the kind of problem that can be easily avoided by enforcing the
>> number of clocks that have to be provided.
> The number of clocks depends on how it's wired for the SoC.
> On omaps, there's are no controls for additinoal SGX clocks. Sure some
> of the clocks may be routed to multple places internally by the wrapper
> module. But we have no control over that.
> If we wanted to specify just the "fck" clock on omaps, then we can
> do it with something like this:
> - if:
> - "ti,omap4-sgx544-112"
> - "ti,omap5-sgx544-116"
> - "ti,dra7-sgx544-116"
> minItems: 1
> maxItems: 1
> const: fck
> - clocks
> - clock-names
will add to v8 of this series as a separate patch on top of the
general one. This should make it easier to have a focussed discussion
and revert/bisect if something goes wrong.
BR and thanks,
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