linux-kernel - [PATCH v5 1/6] dt-bindings: pci: Update iProc PCI binding for INTx support

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Message-Id: <1585205326-25326-2-git-send-email-srinath.mannam@broadcom.com>
Date:   Thu, 26 Mar 2020 12:18:41 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>, Rob Herring <robh+dt@...nel.org>,
        Andrew Murray <andrew.murray@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Ray Jui <ray.jui@...adcom.com>,
        Srinath Mannam <srinath.mannam@...adcom.com>
Subject: [PATCH v5 1/6] dt-bindings: pci: Update iProc PCI binding for INTx support

From: Ray Jui <ray.jui@...adcom.com>

Update the iProc PCIe binding document for better modeling of the legacy
interrupt (INTx) support.

Signed-off-by: Ray Jui <ray.jui@...adcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    | 48 ++++++++++++++++++----
 1 file changed, 41 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
index df065aa..d3f833a 100644
--- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -13,9 +13,6 @@ controller, used in Stingray
   PAXB-based root complex is used for external endpoint devices. PAXC-based
 root complex is connected to emulated endpoint devices internal to the ASIC
 - reg: base address and length of the PCIe controller I/O register space
-- #interrupt-cells: set to <1>
-- interrupt-map-mask and interrupt-map, standard PCI properties to define the
-  mapping of the PCIe interface to interrupt numbers
 - linux,pci-domain: PCI domain ID. Should be unique for each host controller
 - bus-range: PCI bus numbers covered
 - #address-cells: set to <3>
@@ -41,6 +38,21 @@ Required:
 - brcm,pcie-ob-axi-offset: The offset from the AXI address to the internal
 address used by the iProc PCIe core (not the PCIe address)
 
+Legacy interrupt (INTx) support (optional):
+
+Note INTx is for PAXB only.
+- interrupt-map-mask and interrupt-map, standard PCI properties to define
+the mapping of the PCIe interface to interrupt numbers
+
+In addition, a sub-node that describes the legacy interrupt controller built
+into the PCIe controller.
+This sub-node must have the following properties:
+ - compatible: must be "brcm,iproc-intc"
+ - interrupt-controller: claims itself as an interrupt controller for INTx
+ - #interrupt-cells: set to <1>
+ - interrupts: interrupt line wired to the generic GIC for INTx support
+ - interrupt-parent: Phandle to the parent interrupt controller
+
 MSI support (optional):
 
 For older platforms without MSI integrated in the GIC, iProc PCIe core provides
@@ -77,8 +89,11 @@ Example:
 		reg = <0x18012000 0x1000>;
 
 		#interrupt-cells = <1>;
-		interrupt-map-mask = <0 0 0 0>;
-		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-map = <0 0 0 1 &pcie0_intc 0>,
+				<0 0 0 2 &pcie0_intc 1>,
+				<0 0 0 3 &pcie0_intc 2>,
+				<0 0 0 4 &pcie0_intc 3>;
 
 		linux,pci-domain = <0>;
 
@@ -98,6 +113,14 @@ Example:
 
 		msi-parent = <&msi0>;
 
+		pcie0_intc: interrupt-controller {
+			compatible = "brcm,iproc-intc";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			interrupt-parent = <&gic>;
+			interrupts = <GIC_SPI 100 IRQ_TYPE_NONE>;
+		};
+
 		/* iProc event queue based MSI */
 		msi0: msi@...12000 {
 			compatible = "brcm,iproc-msi";
@@ -115,8 +138,11 @@ Example:
 		reg = <0x18013000 0x1000>;
 
 		#interrupt-cells = <1>;
-		interrupt-map-mask = <0 0 0 0>;
-		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-map = <0 0 0 1 &pcie1_intc 0>,
+				<0 0 0 2 &pcie1_intc 1>,
+				<0 0 0 3 &pcie1_intc 2>,
+				<0 0 0 4 &pcie1_intc 3>;
 
 		linux,pci-domain = <1>;
 
@@ -130,4 +156,12 @@ Example:
 
 		phys = <&phy 1 6>;
 		phy-names = "pcie-phy";
+
+		pcie1_intc: interrupt-controller {
+			compatible = "brcm,iproc-intc";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			interrupt-parent = <&gic>;
+			interrupts = <GIC_SPI 106 IRQ_TYPE_NONE>;
+		};
 	};
-- 
2.7.4