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Subject: Re: [PATCH 3/8] bindings: PCI: designware: Add support for the EP in
 designware driver
To:     Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
        "Joao.Pinto@synopsys.com" <Joao.Pinto@synopsys.com>,
        "jingoohan1@gmail.com" <jingoohan1@gmail.com>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "mark.rutland@arm.com" <mark.rutland@arm.com>
References: <cover.1522235224.git.gustavo.pimentel@synopsys.com>
 <dd582bfc2780679b7a092d23547c316234a84c34.1522235224.git.gustavo.pimentel@synopsys.com>
 <405911c8-fffc-5bd7-76c5-f7aabde3b7bc@ti.com>
 <87ba8936-e870-f52b-2ff1-0aea90d0a25c@synopsys.com>
CC:     "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
From:   Kishon Vijay Abraham I <kishon@ti.com>
Message-ID: <f94889e3-ba6f-5aba-d0ab-85db5d434cc9@ti.com>
Date:   Tue, 3 Apr 2018 16:25:31 +0530
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Hi,

On Tuesday 03 April 2018 04:13 PM, Gustavo Pimentel wrote:
> Hi Kishon,
> 
> On 02/04/2018 06:35, Kishon Vijay Abraham I wrote:
>>
>>
>> On Wednesday 28 March 2018 05:08 PM, Gustavo Pimentel wrote:
>>> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
>>
>> Please add a commit message.
> 
> Ok. I'll add. Thanks for noticing it.
> 
>>> ---
>>>  Documentation/devicetree/bindings/pci/designware-pcie.txt | 13 +++++++++++++
>>>  1 file changed, 13 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
>>> index 6300762..4bb2e08 100644
>>> --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
>>> +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
>>> @@ -3,6 +3,7 @@
>>>  Required properties:
>>>  - compatible:
>>>  	"snps,dw-pcie" for RC mode;
>>> +	"snps,dw-pcie-ep" for EP mode;
>>>  - reg: Should contain the configuration address space.
>>>  - reg-names: Must be "config" for the PCIe configuration space.
>>>      (The old way of getting the configuration address space from "ranges"
>>> @@ -56,3 +57,15 @@ Example configuration:
>>>  		#interrupt-cells = <1>;
>>>  		num-lanes = <1>;
>>>  	};
>>> +or
>>> +	pcie_ep: pcie_ep@dfc00000 {
>>> +		compatible = "snps,dw-pcie-ep";
>>> +		reg = <0xdfc00000 0x0001000>, /* IP registers 1 */
>>> +		      <0xdfc01000 0x0001000>, /* IP registers 2 */
>>
>> Doesn't this have iATU unroll space?
> 
> I don't think EP has it, but I'm no expert on this matter. Can you provide me
> some example of having iATU unroll space mapping would be useful in EP scope?

I'm not sure. I thought if the dwc3 core version is 4.80, then it'll have a
separate ATU space irrespective of RC mode or EP mode.

Thanks
Kishon