linux-kernel - [PATCH v2 1/2] dt-bindings: PCI: sprd: Document Unisoc PCIe RC host controller

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Date:   Tue,  8 Sep 2020 21:47:20 +0800
From:   Hongtao Wu <wuht06@...il.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Billows Wu <billows.wu@...soc.com>
Subject: [PATCH v2 1/2] dt-bindings: PCI: sprd: Document Unisoc PCIe RC host controller

From: Billows Wu <billows.wu@...soc.com>

This series adds PCIe bindings for Unisoc SoCs.
This controller is based on Designware PCIe IP.

Signed-off-by: Billows Wu <billows.wu@...soc.com>
---
 .../devicetree/bindings/pci/sprd-pcie.yaml         | 101 +++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/sprd-pcie.yaml

diff --git a/Documentation/devicetree/bindings/pci/sprd-pcie.yaml b/Documentation/devicetree/bindings/pci/sprd-pcie.yaml
new file mode 100644
index 0000000..40c2408
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/sprd-pcie.yaml
@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/sprd-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SoC PCIe Host Controller Device Tree Bindings
+
+maintainers:
+  - Billows Wu <billows.wu@...soc.com>
+
+allOf:
+  - $ref: /schemas/pci/pci-bus.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: sprd,pcie-rc
+
+  reg:
+    minItems: 2
+    items:
+      - description: Controller control and status registers.
+      - description: PCIe configuration registers.
+
+  reg-names:
+    items:
+      - const: dbi
+      - const: config
+
+  ranges:
+    maxItems: 2
+
+  num-lanes:
+    maximum: 1
+    description: Number of lanes to use for this port.
+
+  interrupts:
+    minItems: 1
+    description: Builtin MSI controller and PCIe host controller.
+
+  interrupt-names:
+    items:
+      - const: msi
+
+  sprd-pcie-poweron-syscons:
+    minItems: 1
+    description: Global register.
+      The first value is the phandle to the global registers required to
+      confige PCIe phy, clock and so on.
+      The second value is the global register type which indicates whether it
+      is a set/clear register or not.
+      The third value is the time to delay after the global register is set or
+      cleared.
+      The fourth value is the global register address.
+      The fifth value is the the mask value that the global register must
+      be operate.
+      The sixth value is the value that will be set to the global register.
+      Note that Some Unisoc global registers have not been upstreamed.
+      The global register and its mask can't be found in linux kernel,
+      so we use an offset address and a number to instead them.
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - num-lanes
+  - ranges
+  - interrupts
+  - interrupt-names
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    ipa {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pcie0: pcie@...00000 {
+            compatible = "sprd,pcie-rc";
+            reg = <0x0 0x2b100000 0x0 0x2000>,
+                  <0x2 0x00000000 0x0 0x2000>;
+            reg-names = "dbi", "config";
+            #address-cells = <3>;
+            #size-cells = <2>;
+            device_type = "pci";
+            ranges = <0x01000000 0x0 0x00000000 0x2 0x00002000 0x0 0x00010000>,
+                     <0x03000000 0x0 0x10000000 0x2 0x10000000 0x1 0xefffffff>;
+            num-lanes = <1>;
+            interrupts = <GIC_SPI 153 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "msi";
+
+            sprd,pcie-poweron-syscons =
+                <&ap_ipa_ahb_regs 0 0 0x0000 0x40 0x40>,
+                <&ap_ipa_ahb_regs 0 0 0x0000 0x20 0x20>;
+            sprd,pcie-poweroff-syscons =
+                <&ap_ipa_ahb_regs 0 0 0x0000 0x20 0x0>,
+                <&ap_ipa_ahb_regs 0 0 0x0000 0x40 0x0>;
+        };
+    };
--
2.7.4