[Letux-kernel] [PATCH v6 01/12] dt-bindings: add img, pvrsgx.yaml for Imagination GPUs

Neil Armstrong narmstrong at baylibre.com
Wed Apr 15 14:54:18 CEST 2020


Hi,

On 15/04/2020 14:43, H. Nikolaus Schaller wrote:
> 
>> Am 15.04.2020 um 12:12 schrieb Maxime Ripard <maxime at cerno.tech>:
>>
>> Hi,
>>
>> On Wed, Apr 15, 2020 at 10:35:08AM +0200, H. Nikolaus Schaller wrote:
>>> The Imagination PVR/SGX GPU is part of several SoC from
>>> multiple vendors, e.g. TI OMAP, Ingenic JZ4780, Intel Poulsbo,
>>> Allwinner A83 and others.
>>>
>>> With this binding, we describe how the SGX processor is
>>> interfaced to the SoC (registers, interrupt etc.).
>>>
>>> In most cases, Clock, Reset and power management is handled
>>> by a parent node or elsewhere (e.g. code in the driver).
>>
>> Wouldn't the "code in the driver" still require the clock / reset /
>> power domain to be set in the DT?
> 
> Well, some SoC seem to use existing clocks and have no reset.
> Or, although not recommended, they may have the io-address range
> hard-coded.

The possible clocks and resets should be added, even if optional.

Please look at the arm utgard, midgard and bifrost bindings.

Neil

> 
> BR,
> Nikolaus
> 
> 
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