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

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Message-ID: <20231106144831.GA317907-robh@kernel.org>
Date:   Mon, 6 Nov 2023 08:48:31 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ziqi Chen <quic_ziqichen@...cinc.com>
Cc:     quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        bvanassche@....org, 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 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?

> Hence in UFS DT
> node we need to give the msi-parent property that point
> to the hardware entity which serves as the MSI controller
> for this UFS controller.
> 
> Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
> ---
>  Documentation/devicetree/bindings/ufs/ufs-common.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/ufs/ufs-common.yaml b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> index bbaee4f5..42309bb 100644
> --- a/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> +++ b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> @@ -73,6 +73,8 @@ properties:
>      description:
>        Specifies max. load that can be drawn from VCCQ2 supply.
>  
> +  msi-parent: true
> +
>  dependencies:
>    freq-table-hz: [ clocks ]
>  
> -- 
> 2.7.4
>