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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Date: Fri, 26 Jan 2024 09:56:42 +0100
Subject: [PATCH v3 1/6] dt-bindings: PCI: qcom,pcie-sm8550: move SM8550 to
 dedicated schema
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Message-Id: <20240126-dt-bindings-pci-qcom-split-v3-1-f23cda4d74c0@linaro.org>
References: <20240126-dt-bindings-pci-qcom-split-v3-0-f23cda4d74c0@linaro.org>
In-Reply-To: <20240126-dt-bindings-pci-qcom-split-v3-0-f23cda4d74c0@linaro.org>
To: Bjorn Andersson <andersson@kernel.org>, 
 Konrad Dybcio <konrad.dybcio@linaro.org>, 
 Lorenzo Pieralisi <lpieralisi@kernel.org>, 
 =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= <kw@linux.com>, 
 Bjorn Helgaas <bhelgaas@google.com>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, 
 Rob Herring <robh+dt@kernel.org>, Conor Dooley <conor+dt@kernel.org>, 
 Manivannan Sadhasivam <mani@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, 
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, 
 Rob Herring <robh@kernel.org>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

The qcom,pcie.yaml binding file containing all possible Qualcomm SoC
PCIe root complexes gets quite complicated with numerous if:then:
conditions customizing clocks, interrupts, regs and resets.  Adding and
reviewing new devices is difficult, so simplify it by having shared
common binding and file with only one group of compatible devices:

1. Copy all common qcom,pcie.yaml properties (so everything except
   supplies) to a new shared qcom,pcie-common.yaml schema.
2. Move SM8550 PCIe compatible devices to dedicated binding file.

This creates equivalent SM8550 schema file, except:
 - Missing required compatible which is actually redundant.
 - Expecting eight MSI interrupts, instead of only one, which was
   incomplete hardware description.

Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 .../devicetree/bindings/pci/qcom,pcie-common.yaml  |  98 ++++++++++++
 .../devicetree/bindings/pci/qcom,pcie-sm8550.yaml  | 171 +++++++++++++++++++++
 .../devicetree/bindings/pci/qcom,pcie.yaml         |  38 -----
 3 files changed, 269 insertions(+), 38 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-common.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-common.yaml
new file mode 100644
index 000000000000..125136176f93
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie-common.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/qcom,pcie-common.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm PCI Express Root Complex Common Properties
+
+maintainers:
+  - Bjorn Andersson <andersson@kernel.org>
+  - Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+properties:
+  reg:
+    minItems: 4
+    maxItems: 6
+
+  reg-names:
+    minItems: 4
+    maxItems: 6
+
+  interrupts:
+    minItems: 1
+    maxItems: 8
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 8
+
+  iommu-map:
+    minItems: 1
+    maxItems: 16
+
+  clocks:
+    minItems: 3
+    maxItems: 13
+
+  clock-names:
+    minItems: 3
+    maxItems: 13
+
+  dma-coherent: true
+
+  interconnects:
+    maxItems: 2
+
+  interconnect-names:
+    items:
+      - const: pcie-mem
+      - const: cpu-pcie
+
+  phys:
+    maxItems: 1
+
+  phy-names:
+    items:
+      - const: pciephy
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    minItems: 1
+    maxItems: 12
+
+  reset-names:
+    minItems: 1
+    maxItems: 12
+
+  perst-gpios:
+    description: GPIO controlled connection to PERST# signal
+    maxItems: 1
+
+  wake-gpios:
+    description: GPIO controlled connection to WAKE# signal
+    maxItems: 1
+
+required:
+  - reg
+  - reg-names
+  - interrupt-map-mask
+  - interrupt-map
+  - clocks
+  - clock-names
+
+anyOf:
+  - required:
+      - interrupts
+      - interrupt-names
+      - "#interrupt-cells"
+  - required:
+      - msi-map
+      - msi-map-mask
+
+allOf:
+  - $ref: /schemas/pci/pci-bus.yaml#
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml
new file mode 100644
index 000000000000..24cb38673581
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml
@@ -0,0 +1,171 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/qcom,pcie-sm8550.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm SM8550 PCI Express Root Complex
+
+maintainers:
+  - Bjorn Andersson <andersson@kernel.org>
+  - Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+description:
+  Qualcomm SM8550 SoC (and compatible) PCIe root complex controller is based on
+  the Synopsys DesignWare PCIe IP.
+
+properties:
+  compatible:
+    oneOf:
+      - const: qcom,pcie-sm8550
+      - items:
+          - enum:
+              - qcom,pcie-sm8650
+          - const: qcom,pcie-sm8550
+
+  reg:
+    minItems: 5
+    maxItems: 6
+
+  reg-names:
+    minItems: 5
+    items:
+      - const: parf # Qualcomm specific registers
+      - const: dbi # DesignWare PCIe registers
+      - const: elbi # External local bus interface registers
+      - const: atu # ATU address space
+      - const: config # PCIe configuration space
+      - const: mhi # MHI registers
+
+  clocks:
+    minItems: 7
+    maxItems: 8
+
+  clock-names:
+    minItems: 7
+    items:
+      - const: aux # Auxiliary clock
+      - const: cfg # Configuration clock
+      - const: bus_master # Master AXI clock
+      - const: bus_slave # Slave AXI clock
+      - const: slave_q2a # Slave Q2A clock
+      - const: ddrss_sf_tbu # PCIe SF TBU clock
+      - const: noc_aggr # Aggre NoC PCIe AXI clock
+      - const: cnoc_sf_axi # Config NoC PCIe1 AXI clock
+
+  interrupts:
+    minItems: 8
+    maxItems: 8
+
+  interrupt-names:
+    items:
+      - const: msi0
+      - const: msi1
+      - const: msi2
+      - const: msi3
+      - const: msi4
+      - const: msi5
+      - const: msi6
+      - const: msi7
+
+  resets:
+    minItems: 1
+    maxItems: 2
+
+  reset-names:
+    minItems: 1
+    items:
+      - const: pci # PCIe core reset
+      - const: link_down # PCIe link down reset
+
+allOf:
+  - $ref: qcom,pcie-common.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,sm8550-gcc.h>
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interconnect/qcom,sm8550-rpmh.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pcie@1c00000 {
+            compatible = "qcom,pcie-sm8550";
+            reg = <0 0x01c00000 0 0x3000>,
+                  <0 0x60000000 0 0xf1d>,
+                  <0 0x60000f20 0 0xa8>,
+                  <0 0x60001000 0 0x1000>,
+                  <0 0x60100000 0 0x100000>;
+            reg-names = "parf", "dbi", "elbi", "atu", "config";
+            ranges = <0x01000000 0x0 0x00000000 0x0 0x60200000 0x0 0x100000>,
+                     <0x02000000 0x0 0x60300000 0x0 0x60300000 0x0 0x3d00000>;
+
+            bus-range = <0x00 0xff>;
+            device_type = "pci";
+            linux,pci-domain = <0>;
+            num-lanes = <2>;
+
+            #address-cells = <3>;
+            #size-cells = <2>;
+
+            clocks = <&gcc GCC_PCIE_0_AUX_CLK>,
+                     <&gcc GCC_PCIE_0_CFG_AHB_CLK>,
+                     <&gcc GCC_PCIE_0_MSTR_AXI_CLK>,
+                     <&gcc GCC_PCIE_0_SLV_AXI_CLK>,
+                     <&gcc GCC_PCIE_0_SLV_Q2A_AXI_CLK>,
+                     <&gcc GCC_DDRSS_PCIE_SF_QTB_CLK>,
+                     <&gcc GCC_AGGRE_NOC_PCIE_AXI_CLK>;
+            clock-names = "aux",
+                          "cfg",
+                          "bus_master",
+                          "bus_slave",
+                          "slave_q2a",
+                          "ddrss_sf_tbu",
+                          "noc_aggr";
+
+            dma-coherent;
+
+            interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 143 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "msi0", "msi1", "msi2", "msi3",
+                              "msi4", "msi5", "msi6", "msi7";
+            #interrupt-cells = <1>;
+            interrupt-map-mask = <0 0 0 0x7>;
+            interrupt-map = <0 0 0 1 &intc 0 0 0 149 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
+                            <0 0 0 2 &intc 0 0 0 150 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
+                            <0 0 0 3 &intc 0 0 0 151 IRQ_TYPE_LEVEL_HIGH>, /* int_c */
+                            <0 0 0 4 &intc 0 0 0 152 IRQ_TYPE_LEVEL_HIGH>; /* int_d */
+
+            interconnects = <&pcie_noc MASTER_PCIE_0 0 &mc_virt SLAVE_EBI1 0>,
+                            <&gem_noc MASTER_APPSS_PROC 0 &cnoc_main SLAVE_PCIE_0 0>;
+            interconnect-names = "pcie-mem", "cpu-pcie";
+
+            iommu-map = <0x0 &apps_smmu 0x1400 0x1>,
+                        <0x100 &apps_smmu 0x1401 0x1>;
+
+            phys = <&pcie0_phy>;
+            phy-names = "pciephy";
+
+            pinctrl-0 = <&pcie0_default_state>;
+            pinctrl-names = "default";
+
+            power-domains = <&gcc PCIE_0_GDSC>;
+
+            resets = <&gcc GCC_PCIE_0_BCR>;
+            reset-names = "pci";
+
+            perst-gpios = <&tlmm 94 GPIO_ACTIVE_LOW>;
+            wake-gpios = <&tlmm 96 GPIO_ACTIVE_HIGH>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
index a93ab3b54066..3b7dd9a4ef60 100644
--- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
@@ -40,11 +40,6 @@ properties:
           - qcom,pcie-sm8350
           - qcom,pcie-sm8450-pcie0
           - qcom,pcie-sm8450-pcie1
-          - qcom,pcie-sm8550
-      - items:
-          - enum:
-              - qcom,pcie-sm8650
-          - const: qcom,pcie-sm8550
       - items:
           - const: qcom,pcie-msm8998
           - const: qcom,pcie-msm8996
@@ -226,7 +221,6 @@ allOf:
               - qcom,pcie-sm8350
               - qcom,pcie-sm8450-pcie0
               - qcom,pcie-sm8450-pcie1
-              - qcom,pcie-sm8550
     then:
       properties:
         reg:
@@ -715,37 +709,6 @@ allOf:
           items:
             - const: pci # PCIe core reset
 
-  - if:
-      properties:
-        compatible:
-          contains:
-            enum:
-              - qcom,pcie-sm8550
-    then:
-      properties:
-        clocks:
-          minItems: 7
-          maxItems: 8
-        clock-names:
-          minItems: 7
-          items:
-            - const: aux # Auxiliary clock
-            - const: cfg # Configuration clock
-            - const: bus_master # Master AXI clock
-            - const: bus_slave # Slave AXI clock
-            - const: slave_q2a # Slave Q2A clock
-            - const: ddrss_sf_tbu # PCIe SF TBU clock
-            - const: noc_aggr # Aggre NoC PCIe AXI clock
-            - const: cnoc_sf_axi # Config NoC PCIe1 AXI clock
-        resets:
-          minItems: 1
-          maxItems: 2
-        reset-names:
-          minItems: 1
-          items:
-            - const: pci # PCIe core reset
-            - const: link_down # PCIe link down reset
-
   - if:
       properties:
         compatible:
@@ -883,7 +846,6 @@ allOf:
               - qcom,pcie-sm8350
               - qcom,pcie-sm8450-pcie0
               - qcom,pcie-sm8450-pcie1
-              - qcom,pcie-sm8550
     then:
       oneOf:
         - properties:

-- 
2.34.1