linux-kernel - Re: [PATCH v1 1/3] dt-bindings: soc: qcom: eud: Update compatible strings for eud

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Message-ID: <e663d19a-0ad1-4dfc-903b-ff2012796d84@kernel.org>
Date: Tue, 20 Aug 2024 21:19:28 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Melody Olvera <quic_molvera@...cinc.com>,
 Trilok Soni <quic_tsoni@...cinc.com>, Konrad Dybcio
 <konradybcio@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>,
 Souradeep Chowdhury <quic_schowdhu@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
 Elson Serrao <quic_eserrao@...cinc.com>
Cc: cros-qcom-dts-watchers@...omium.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-usb@...r.kernel.org
Subject: Re: [PATCH v1 1/3] dt-bindings: soc: qcom: eud: Update compatible
 strings for eud

On 20.08.2024 8:21 PM, Melody Olvera wrote:
> 
> 
> On 8/14/2024 3:09 PM, Trilok Soni wrote:
>> On 8/14/2024 1:25 PM, Konrad Dybcio wrote:
>>>> Unfortunately, no. We considered several options, but none guarantee that we will avoid
>>>> a crash if we try non-securely. The secure call also won't give a specific error if it fails either
>>>> (for security reasons) so we can't know if a secure access failed because it's supposed to be
>>>> accessed non-securely or for another reason; hence this approach. If there's
>>>> another way to achieve this functionality that might be better, I'm all ears.
>>> Can we read some fuse values and decide based on that?
>> In most of the cases, these fuse values are not allowed to be read
>> from the Linux, so that will be another problem. Melody can check
>> if there is any fuse values around here and possible to read them
>> through Linux.
>>
> 
> I double-checked, but there really isn't any kind of fuse or anything we can read to determine
> how we need to access these registers. I remembered checking before authoring these patches,
> but I wanted to just make sure before responding here.

Well in that case I suppose a new compatible / property (please voice
your opinion Krzysztof) is necessary after all.. Thanks for making sure

Konrad