linux-kernel - Re: [PATCH v3 1/6] dt-bindings: PCI: Add binding for qps615

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Message-ID: <b203d90d-91bc-437b-9b91-1085034ed716@kernel.org>
Date: Mon, 25 Nov 2024 08:40:38 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
Cc: andersson@...nel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>,
 cros-qcom-dts-watchers@...omium.org, Jingoo Han <jingoohan1@...il.com>,
 Bartosz Golaszewski <brgl@...ev.pl>, quic_vbadigan@...cinc.com,
 linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] dt-bindings: PCI: Add binding for qps615

On 24/11/2024 02:41, Krishna Chaitanya Chundru wrote:
>> ...
>>
>>> +  qps615,axi-clk-freq-hz:
>>
>> That's a downstream code you send us.
>>
>> Anyway, why assigned clock rates do not work for you? You are
>> re-implementing legacy property now under different name :/
>>
>> The assigned clock rates comes in to the picture when we are using clock
> framework to control the clocks. For this switch there are no clocks 
> needs to be control, the moment we power on the switch clocks are
> enabled by default. This switch provides a mechanism to control the
> frequency using i2c. And switch supports only two frequencies i.e


frequency of what, since there are no clocks?

> 125MHz and 250MHZ by default it runs on 250MHz, we can do one i2c
> write with which switch runs in 125MHz.

How doing a write is relevant? Or you want to say you can control clock?



Best regards,
Krzysztof