linux-kernel - [PATCH v2] dt-bindings: ufs: Add msi-parent for UFS MCQ

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Message-Id: <1700629624-23571-1-git-send-email-quic_ziqichen@quicinc.com>
Date:   Wed, 22 Nov 2023 13:06:52 +0800
From:   Ziqi Chen <quic_ziqichen@...cinc.com>
To:     quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        bvanassche@....org, mani@...nel.org, stanley.chu@...iatek.com,
        adrian.hunter@...el.com, beanhuo@...ron.com, avri.altman@....com,
        junwoo80.lee@...sung.com, martin.petersen@...cle.com,
        quic_ziqichen@...cinc.com, quic_nguyenb@...cinc.com,
        quic_nitirawa@...cinc.com
Cc:     linux-scsi@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Wolfram Sang <wsa@...nel.org>, Mark Brown <broonie@...nel.org>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] dt-bindings: ufs: Add msi-parent for UFS MCQ

The Message Signaled Interrupts (MSI) support has been
introduced in UFSHCI version 4.0 (JESD223E). The MSI is
the recommended interrupt approach for MCQ. If choose to
use MSI, In UFS DT, we need to provide 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>

Changes to v1:

- Rebased on Linux 6.7-rc1.

- Updated the commit message to incorporate the details about
  when MCQ/MSI got introduced.
---
 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 985ea8f..31fe7f3 100644
--- a/Documentation/devicetree/bindings/ufs/ufs-common.yaml
+++ b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
@@ -87,6 +87,8 @@ properties:
     description:
       Specifies max. load that can be drawn from VCCQ2 supply.
 
+  msi-parent: true
+
 dependencies:
   freq-table-hz: [ clocks ]
   operating-points-v2: [ clocks, clock-names ]
-- 
2.7.4