linux-kernel - Re: [PATCH] dt-bindings: ufs: Add msi-parent for UFS MCQ

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Date:   Thu, 9 Nov 2023 18:51:24 +0800
From:   Ziqi Chen <quic_ziqichen@...cinc.com>
To:     Bart Van Assche <bvanassche@....org>, Rob Herring <robh@...nel.org>
CC:     <quic_asutoshd@...cinc.com>, <quic_cang@...cinc.com>,
        <mani@...nel.org>, <beanhuo@...ron.com>, <avri.altman@....com>,
        <junwoo80.lee@...sung.com>, <martin.petersen@...cle.com>,
        <quic_nguyenb@...cinc.com>, <quic_nitirawa@...cinc.com>,
        <quic_rampraka@...cinc.com>, <linux-scsi@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Wolfram Sang <wsa@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Mark Brown <broonie@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dt-bindings: ufs: Add msi-parent for UFS MCQ



On 11/7/2023 1:56 AM, Bart Van Assche wrote:
> On 11/6/23 06:48, Rob Herring wrote:
>> On Wed, Nov 01, 2023 at 06:48:13PM +0800, Ziqi Chen wrote:
>>> The Message Signaled Interrupts (MSI) has been introduced
>>> to UFS driver since the MCQ be enabled.
>>
>> Not really relevant when a driver supported MSI, but the when the h/w
>> did. Has UFS always supported MSI? It was added in some version of the
>> spec?
> 
> MSI support has been introduced in UFSHCI version 4.0 and I think that
> the controller vendor can decide whether or not to implement MSI. Does
> this mean that the patch needs to be improved?
> 
> Thanks,
> 
> Bart.
> 

Hi Rob, in my previous patch " dt-bindings: ufs: qcom: Add msi-parent 
for UFS MCQ",  Manivannan Sadhasivam also think instead of 
qcom,ufs.yaml, this should be part of ufs-common.yaml.

please let me know if there is any others I need to improve for this 
patch. Thanks a lot.


Best Regards,
Ziqi