linux-kernel - Re: [PATCH] arm64: dts: ti: k3-j7200: correct num-lanes requested for PCIe

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Message-ID: <215913ae-dfd2-aaff-86b1-9def30648155@ti.com>
Date:   Tue, 16 May 2023 14:31:26 +0530
From:   "Verma, Achal" <a-verma1@...com>
To:     Siddharth Vadapalli <s-vadapalli@...com>
CC:     Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Achal Verma <a-verma1@...com>
Subject: Re: [PATCH] arm64: dts: ti: k3-j7200: correct num-lanes requested for
 PCIe



On 5/16/2023 12:03 PM, Siddharth Vadapalli wrote:
> Achal,
> 
> On 16/05/23 11:52, Achal Verma wrote:
>> From: Matt Ranostay <mranostay@...com>
>>
>> J7200 has a limited 2x support for PCIe, and the properties should be
>> updated as such.
> 
> According to J7200 Datasheet at [0], the SoC supports up to x4 PCIe lanes. Could
> you please clarify where the lanes are documented to be 2x?
> 
> [0]: https://www.ti.com/lit/ds/symlink/dra821u-q1.pdf

Yes, this patch should be dropped.
No need to change lanes.

Regards,
Achal Verma
> 
>>
>> Signed-off-by: Matt Ranostay <mranostay@...com>
>> Signed-off-by: Achal Verma <a-verma1@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-j7200-main.dtsi | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j7200-main.dtsi b/arch/arm64/boot/dts/ti/k3-j7200-main.dtsi
>> index ef352e32f19d..5e62b431d6e8 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j7200-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-j7200-main.dtsi
>> @@ -729,7 +729,7 @@ pcie1_rc: pcie@...0000 {
>>   		device_type = "pci";
>>   		ti,syscon-pcie-ctrl = <&scm_conf 0x4074>;
>>   		max-link-speed = <3>;
>> -		num-lanes = <4>;
>> +		num-lanes = <2>;
>>   		power-domains = <&k3_pds 240 TI_SCI_PD_EXCLUSIVE>;
>>   		clocks = <&k3_clks 240 6>;
>>   		clock-names = "fck";
>> @@ -757,7 +757,7 @@ pcie1_ep: pcie-ep@...0000 {
>>   		interrupts = <GIC_SPI 330 IRQ_TYPE_EDGE_RISING>;
>>   		ti,syscon-pcie-ctrl = <&scm_conf 0x4074>;
>>   		max-link-speed = <3>;
>> -		num-lanes = <4>;
>> +		num-lanes = <2>;
>>   		power-domains = <&k3_pds 240 TI_SCI_PD_EXCLUSIVE>;
>>   		clocks = <&k3_clks 240 6>;
>>   		clock-names = "fck";
>