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Message-Id: <20220108184143.69479-1-david@ixit.cz>
Date: Sat, 8 Jan 2022 19:41:42 +0100
From: David Heidelberg <david@...t.cz>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: ~okias/devicetree@...ts.sr.ht, David Heidelberg <david@...t.cz>,
iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v3] dt-bindings: iommu: Convert msm,iommu-v0 to yaml
Convert Qualcomm IOMMU v0 implementation to yaml format.
Signed-off-by: David Heidelberg <david@...t.cz>
---
v2:
- fix wrong path in binding $id
- comment qcom,mdp4 node example (we don't want to validate it yet)
v3:
- I kept the name as -v0, since we have other binding -v1 and it look
good, I can change thou in v4 if requested.
- dropped non-existent smmu_clk part (and adjusted example, which was
using it)
- dropped iommu description
- moved iommu-cells description to the property #iommu-cells
Signed-off-by: David Heidelberg <david@...t.cz>
---
.../bindings/iommu/msm,iommu-v0.txt | 64 -------------
.../bindings/iommu/qcom,iommu-v0.yaml | 91 +++++++++++++++++++
2 files changed, 91 insertions(+), 64 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
create mode 100644 Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml
diff --git a/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt b/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
deleted file mode 100644
index 20236385f26e..000000000000
--- a/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
+++ /dev/null
@@ -1,64 +0,0 @@
-* QCOM IOMMU
-
-The MSM IOMMU is an implementation compatible with the ARM VMSA short
-descriptor page tables. It provides address translation for bus masters outside
-of the CPU, each connected to the IOMMU through a port called micro-TLB.
-
-Required Properties:
-
- - compatible: Must contain "qcom,apq8064-iommu".
- - reg: Base address and size of the IOMMU registers.
- - interrupts: Specifiers for the MMU fault interrupts. For instances that
- support secure mode two interrupts must be specified, for non-secure and
- secure mode, in that order. For instances that don't support secure mode a
- single interrupt must be specified.
- - #iommu-cells: The number of cells needed to specify the stream id. This
- is always 1.
- - qcom,ncb: The total number of context banks in the IOMMU.
- - clocks : List of clocks to be used during SMMU register access. See
- Documentation/devicetree/bindings/clock/clock-bindings.txt
- for information about the format. For each clock specified
- here, there must be a corresponding entry in clock-names
- (see below).
-
- - clock-names : List of clock names corresponding to the clocks specified in
- the "clocks" property (above).
- Should be "smmu_pclk" for specifying the interface clock
- required for iommu's register accesses.
- Should be "smmu_clk" for specifying the functional clock
- required by iommu for bus accesses.
-
-Each bus master connected to an IOMMU must reference the IOMMU in its device
-node with the following property:
-
- - iommus: A reference to the IOMMU in multiple cells. The first cell is a
- phandle to the IOMMU and the second cell is the stream id.
- A single master device can be connected to more than one iommu
- and multiple contexts in each of the iommu. So multiple entries
- are required to list all the iommus and the stream ids that the
- master is connected to.
-
-Example: mdp iommu and its bus master
-
- mdp_port0: iommu@...0000 {
- compatible = "qcom,apq8064-iommu";
- #iommu-cells = <1>;
- clock-names =
- "smmu_pclk",
- "smmu_clk";
- clocks =
- <&mmcc SMMU_AHB_CLK>,
- <&mmcc MDP_AXI_CLK>;
- reg = <0x07500000 0x100000>;
- interrupts =
- <GIC_SPI 63 0>,
- <GIC_SPI 64 0>;
- qcom,ncb = <2>;
- };
-
- mdp: qcom,mdp@...0000 {
- compatible = "qcom,mdp";
- ...
- iommus = <&mdp_port0 0
- &mdp_port0 2>;
- };
diff --git a/Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml b/Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml
new file mode 100644
index 000000000000..a506e8ad8902
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: "http://devicetree.org/schemas/iommu/qcom,iommu-v0.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Qualcomm IOMMU for APQ8064
+
+maintainers:
+ - Will Deacon <will@...nel.org>
+
+description: >
+ The MSM IOMMU is an implementation compatible with the ARM VMSA short
+ descriptor page tables. It provides address translation for bus masters
+ outside of the CPU, each connected to the IOMMU through a port called micro-TLB.
+
+properties:
+ compatible:
+ const: qcom,apq8064-iommu
+
+ clocks:
+ items:
+ - description: interface clock for register accesses
+ - description: functional clock for bus accesses
+
+ clock-names:
+ items:
+ - const: smmu_pclk
+ - const: iommu_clk
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ description: Specifiers for the MMU fault interrupts.
+ minItems: 1
+ items:
+ - description: non-secure mode interrupt
+ - description: secure mode interrupt (for instances which supports it)
+
+ "#iommu-cells":
+ const: 1
+ description: |
+ The first cell is a phandle to the IOMMU and
+ the second cell is the stream id.
+ A single master device can be connected to more than one iommu
+ and multiple contexts in each of the iommu.
+ So multiple entries are required to list all the iommus and
+ the stream ids that the master is connected to.
+
+ qcom,ncb:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: The total number of context banks in the IOMMU.
+
+required:
+ - clocks
+ - clock-names
+ - reg
+ - interrupts
+ - qcom,ncb
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/qcom,mmcc-msm8960.h>
+
+ mdp_port0: iommu@...0000 {
+ compatible = "qcom,apq8064-iommu";
+ #iommu-cells = <1>;
+ clock-names =
+ "smmu_pclk",
+ "iommu_clk";
+ clocks =
+ <&clk SMMU_AHB_CLK>,
+ <&clk MDP_AXI_CLK>;
+ reg = <0x07500000 0x100000>;
+ interrupts =
+ <0 63 0>,
+ <0 64 0>;
+ qcom,ncb = <2>;
+ };
+
+ /* mdp: mdp@...0000 {
+ compatible = "qcom,mdp4";
+ ...
+
+ iommus = <&mdp_port0 0
+ &mdp_port0 2>;
+ };*/
--
2.34.1
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