Add device tree binding documentation for PCIe controller in J721E SoC.
Signed-off-by: Kishon Vijay Abraham I <[email protected]>
---
.../devicetree/bindings/pci/ti,j721e-pci.txt | 63 +++++++++++++++++++
include/dt-bindings/pci/pci.h | 12 ++++
2 files changed, 75 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/ti,j721e-pci.txt
create mode 100644 include/dt-bindings/pci/pci.h
diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci.txt
b/Documentation/devicetree/bindings/pci/ti,j721e-pci.txt
new file mode 100644
index 000000000000..9132eff7ea0d
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci.txt
@@ -0,0 +1,63 @@
+PCI Controller in J721E:
+Required Properties:
+ - compatible: Should be "ti,j721e-pcie"
+ - reg : Two register ranges as listed in the reg-names property
+ - reg-names : The first entry must be "intd_cfg" used for handling legacy
+ interrupts. The second entry must be "user_cfg" and it has registers
+ for enabling the LTSSM. The third entry must be "vmap" and it has
+ registers for programming the requestor ID to VIRTID mapping and ATYPE.
+ - #address-cells : should be 1 to indicate the child node should use 1 cell
+ for address
+ - #size-cells : should be 1 to indicate the child node should use 1 cell for
+ size
+ - mode : should be <PCI_MODE_RC> for RC mode and should be <PCI_MODE_EP> for
+ EP mode
+
+Optional Properties:
+ - max-link-speed: As defined in Documentation/devicetree/bindings/pci/pci.txt
+ Default is GEN3
+ - num-lanes: number of lanes to use. Default is '1' lane
+It should have two child nodes, one for RC mode (pcie) and the other for EP
+mode (pcie-ep). The child node for RC should follow the binding in
+cdns,cdns-pcie-host.txt. The child node for the EP should follow the binding
+in cdns,cdns-pcie-ep.txt
+
+Example:
+ pcie0: pcie@2900000 {
+ compatible = "ti,j721e-pcie";
+ reg = <0x02900000 0x1000>,
+ <0x02907000 0x400>;
+ reg-names = "intd_cfg", "user_cfg";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ pcie0_rc: pcie@d000000 {
+ compatible = "cdns,cdns-pcie-host";
+ reg = <0x0d000000 0x00800000>,
+ <0x10000000 0x00001000>,
+ <0x10000000 0x08000000>;
+ reg-names = "reg", "cfg", "mem";
+ device_type = "pci";
+ #address-cells = <3>;
+ #size-cells = <2>;
+ bus-range = <0x0 0xff>;
+ linux,pci-domain = <0>;
+ cdns,max-outbound-regions = <16>;
+ cdns,no-bar-match-nbits = <32>;
+ vendor-id = /bits/ 16 <0x17cd>;
+ device-id = /bits/ 16 <0x0200>;
+ msi-map = <0x0 &gic_its 0x0 0x1000>;
+ ranges = <0x01000000 0x0 0x10001000 0x10001000 0x0
0x0010000>,
+ <0x02000000 0x0 0x10011000 0x10011000 0x0
0x7fef000>;
+ };
+
+ pcie0_ep: pcie-ep@d000000 {
+ compatible = "cdns,cdns-pcie-ep";
+ reg = <0x0d000000 0x00800000>,
+ <0x10000000 0x08000000>;
+ reg-names = "reg", "mem";
+ cdns,max-outbound-regions = <16>;
+ max-functions = /bits/ 8 <2>;
+ };
+ };
diff --git a/include/dt-bindings/pci/pci.h b/include/dt-bindings/pci/pci.h
new file mode 100644
index 000000000000..6fe7ccaf9e99
--- /dev/null
+++ b/include/dt-bindings/pci/pci.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides constants for PCI bindings.
+ */
+
+#ifndef _DT_BINDINGS_PCI_H
+#define _DT_BINDINGS_PCI_H
+
+#define PCI_MODE_RC 1
+#define PCI_MODE_EP 2
+
+#endif
--
2.17.1
