linux-kernel - Re: [PATCH 3/8] bindings: PCI: designware: Add support for the EP in designware driver

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Date:   Tue, 3 Apr 2018 14:20:45 +0100
From:   Gustavo Pimentel <gustavo.pimentel@...opsys.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 3/8] bindings: PCI: designware: Add support for the EP in
 designware driver

Hi Kishon,

On 03/04/2018 11:55, Kishon Vijay Abraham I wrote:
> 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@...opsys.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@...00000 {
>>>> +		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.

As replied on patch 1, let's leave out  any reference of iATU unroll to avoid
any confusion. Agree?

> 
> Thanks
> Kishon
> 

Regards,
Gustavo