linux-kernel - Re: [RESEND PATCH 1/2] arm64: dts: ti: k3-j721e-main: Add PCIe device tree nodes

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Date:   Mon, 14 Sep 2020 16:53:42 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>
CC:     Tero Kristo <t-kristo@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH 1/2] arm64: dts: ti: k3-j721e-main: Add PCIe device
 tree nodes

Hi Rob,

On 02/09/20 1:07 pm, Kishon Vijay Abraham I wrote:
> Hi Rob,
> 
> On 02/09/20 10:24 am, Kishon Vijay Abraham I wrote:
>> Hi Nishanth,
>>
>> On 01/09/20 8:22 pm, Nishanth Menon wrote:
>>> On 19:36-20200901, Kishon Vijay Abraham I wrote:
>>>> Add PCIe device tree node (both RC and EP) for the four
>>>> PCIe instances here.
>>>>
>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>>> ---
>>>>   arch/arm64/boot/dts/ti/k3-j721e-main.dtsi | 218
>>>> ++++++++++++++++++++++
>>>>   arch/arm64/boot/dts/ti/k3-j721e.dtsi      |   5 +-
>>>>   2 files changed, 222 insertions(+), 1 deletion(-)
>>>
>>>
>>> Did you look at the diff of the dtbs_check before and after this
>>> series? I see: https://pastebin.ubuntu.com/p/9fyfrTjx9M/
>>
>> I didn't see any errors when I checked for individual bindings
>> a0393678@...93678-ssd:~/repos/linux$ mkconfig64 dtbs_check
>> DT_SCHEMA_FILES="Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml"
>>
>>    SCHEMA  Documentation/devicetree/bindings/processed-schema.yaml
>>    DTC     arch/arm64/boot/dts/ti/k3-am654-base-board.dt.yaml
>>    DTC     arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dt.yaml
>>    CHECK   arch/arm64/boot/dts/ti/k3-am654-base-board.dt.yaml
>>    CHECK   arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dt.yaml
>> a0393678@...93678-ssd:~/repos/linux$ mkconfig64 dtbs_check
>> DT_SCHEMA_FILES="Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml"
>>
>>    SCHEMA  Documentation/devicetree/bindings/processed-schema.yamlsimple-bus
>>    DTC     arch/arm64/boot/dts/ti/k3-am654-base-board.dt.yaml
>>    DTC     arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dt.yaml
>>    CHECK   arch/arm64/boot/dts/ti/k3-am654-base-board.dt.yaml
>>    CHECK   arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dt.yaml
> 
> Can you give hint on why I get ranges is too long error
> https://pastebin.ubuntu.com/p/cPm2tg3dcV/ which I give mkconfig64
> dtbs_check but don't see an error when I include "DT_SCHEMA_FILES"?

I debugged this and looks like PCIe "ranges" property conflicts with
simple-bus.

A diff like below helps to solve the issue
diff --git a/schemas/simple-bus.yaml b/schemas/simple-bus.yaml
index 248ac9d..ed818ef 100644
--- a/schemas/simple-bus.yaml
+++ b/schemas/simple-bus.yaml
@@ -39,7 +39,7 @@ patternProperties:
         oneOf:
           - items:
               minItems: 3
-              maxItems: 6
+              maxItems: 7
             minItems: 0
             maxItems: 1024
           - $ref: "types.yaml#/definitions/flag"

If this looks right to you, I can post a patch for it. Without fixing
this we would see false errors for PCIe DT nodes.

Thanks
Kishon