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

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Date:   Thu, 26 Mar 2020 14:51:47 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Srinath Mannam <srinath.mannam@...adcom.com>
Cc:     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>, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ray Jui <ray.jui@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 1/6] dt-bindings: pci: Update iProc PCI binding for
 INTx support

Srinath,

Please note that Andrew's email address as changed (see the MAINTAINERS 
file).

On 2020-03-26 06:48, Srinath Mannam wrote:
> 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>;

There is no such thing as IRQ_TYPE_NONE in the GIC binding.
Please update this to the right trigger type (which better
be level high...)

         M.
-- 
Jazz is not dead. It just smells funny...