Re: [PATCH v2] dt-bindings: phy: qcom,usb-snps-femto-v2: Add bindings for QCS9100

[Aiqun Yu (Maria)]

On 7/11/2024 12:45 AM, Trilok Soni wrote:
> On 7/10/2024 9:27 AM, Rob Herring wrote:
>> On Tue, Jul 09, 2024 at 08:46:19PM +0800, Tengfei Fan wrote:
>>> Document the compatible string for USB phy found in Qualcomm QCS9100
>>> SoC.
>>> QCS9100 is drived from SA8775p. Currently, both the QCS9100 and SA8775p
>>> platform use non-SCMI resource. In the future, the SA8775p platform will
>>> move to use SCMI resources and it will have new sa8775p-related device
>>> tree. Consequently, introduce "qcom,qcs9100-usb-hs-phy" to describe
>>> non-SCMI based USB phy.
>>>
>>> Signed-off-by: Tengfei Fan <quic_tengfan@xxxxxxxxxxx>
>>> ---
>>> Introduce support for the QCS9100 SoC device tree (DTSI) and the
>>> QCS9100 RIDE board DTS. The QCS9100 is a variant of the SA8775p.
>>> While the QCS9100 platform is still in the early design stage, the
>>> QCS9100 RIDE board is identical to the SA8775p RIDE board, except it
>>> mounts the QCS9100 SoC instead of the SA8775p SoC.
>>>
>>> The QCS9100 SoC DTSI is directly renamed from the SA8775p SoC DTSI, and
>>> all the compatible strings will be updated from "SA8775p" to "QCS9100".
>>> The QCS9100 device tree patches will be pushed after all the device tree
>>> bindings and device driver patches are reviewed.
>>
>> I'm not convinced this is not just pointless churn. Aren't we going to 
>> end up with 2 compatible strings for everything? SCMI should just change 
>> the providers, but otherwise the consumers are the same. I suppose if 
>> clocks are abstracted into power-domains (an abuse IMO) then the 
>> bindings change.
>>
>> Why do we need to support both SCMI and not-SCMI for the same chip?
> 
> IOT SKU of this SOC is using the non-SCMI solution and Auto SKU
> of this SOC is using the SCMI based solution due to additional
> safety requirements. 

More add-on information, IOT SKU which have qcs9100 soc mounted will
have firmware releases which support non-scmi solution.
And AUTO SKU which mounted with SA8775p will have different firmware
releases which support SCMI solution.
> 
> 

-- 
Thx and BRs,
Aiqun(Maria) Yu