linux-kernel - [PATCH 0/4] Add support for APPS SMMU on QCS615

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Message-ID: <20241011063112.19087-1-quic_qqzhou@quicinc.com>
Date: Fri, 11 Oct 2024 12:01:08 +0530
From: Qingqing Zhou <quic_qqzhou@...cinc.com>
To: <andersson@...nel.org>, <konradybcio@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <robimarko@...il.com>,
        <quic_gurus@...cinc.com>, <will@...nel.org>, <robin.murphy@....com>,
        <joro@...tes.org>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
        Qingqing Zhou
	<quic_qqzhou@...cinc.com>
Subject: [PATCH 0/4] Add support for APPS SMMU on QCS615

Enable APPS SMMU function on QCS615 platform. SMMU is required for
multiple functions including USB/UFS/Ethernet.

The reason of adding scm node:
SMMU driver probe will check qcom_scm ready or not, without scm
node, SMMU driver probe will defer, so add the scm node for SMMU
probe normally.
The dmesg log without scm node:
platform 15000000.iommu: deferred probe pending: arm-smmu: qcom_scm not ready

With the scm node, SMMU can probe normally, but scm driver still fails
to probe because of one scm bug.
The dmesg log of the scm bug:
qcom_scm firmware:scm: error (____ptrval____): Failed to enable the TrustZone memory allocator
qcom_scm firmware:scm: probe with driver qcom_scm failed with error 4
The scm bug mentioned above is fixed:
https://lore.kernel.org/all/20241005140150.4109700-2-quic_kuldsing@quicinc.com/
But above patch to fix scm bug doesn't impact building of current patch series, this
patch series can build successfully without above patch.

Dependency:
https://lore.kernel.org/all/20240926-add_initial_support_for_qcs615-v3-0-e37617e91c62@quicinc.com/

Qingqing Zhou (4):
  dt-bindings: firmware: qcom,scm: document SCM on QCS615
  dt-bindings: arm-smmu: Document Qualcomm QCS615 apps smmu
  arm64: dts: qcom: qcs615: add scm node
  arm64: dts: qcom: qcs615: add the APPS SMMU node

 .../bindings/firmware/qcom,scm.yaml           |  1 +
 .../devicetree/bindings/iommu/arm,smmu.yaml   |  1 +
 arch/arm64/boot/dts/qcom/qcs615.dtsi          | 81 +++++++++++++++++++
 3 files changed, 83 insertions(+)

-- 
2.17.1