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

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Message-ID: <5850d5ac-e735-4358-866d-f410b00ba39d@acm.org>
Date:   Mon, 6 Nov 2023 09:56:23 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Rob Herring <robh@...nel.org>,
        Ziqi Chen <quic_ziqichen@...cinc.com>
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 11/6/23 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.