linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8450: delete incorrect ufs interconnect fields

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Date:   Tue, 12 Apr 2022 17:07:13 -0400
From:   Jonathan Marek <jonathan@...ek.ca>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sm8450: delete incorrect ufs
 interconnect fields


On 4/12/22 4:51 PM, Bjorn Andersson wrote:
> On Thu 07 Apr 12:21 CDT 2022, Jonathan Marek wrote:
> 
>> Upstream sm8450.dtsi has #interconnect-cells = <2>; so these are wrong.
>> Ignored and undocumented with upstream UFS driver so delete for now.
>>
> 
> Just to clarify, the binding do document interconnects and the property
> should be there in the end. v1 (why isn't this marked v2?) was correct.
> 
> What I asked for was a statement on why it should be picked up for
> v5.18-rc (as Dmitry requested).
> 

This isn't a v2, I sent this without seeing there was already patch for 
the same "problem".

A reason for picking it up is that if you have a patch adding the 
interconnect support to the UFS driver in your tree, the incorrect dts 
will prevent it from probing  (so the 5.18-rc1 dts could fail with newer 
kernel eventually, not sure if upstream cares about that?)

> Regards,
> Bjorn
> 
>> Fixes: aa2d0bf04a3c ("arm64: dts: qcom: sm8450: add interconnect nodes")
>> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
>> ---
>>   arch/arm64/boot/dts/qcom/sm8450.dtsi | 3 ---
>>   1 file changed, 3 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> index 2c18e1ef9e82d..90cdbec3cac99 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> @@ -1663,9 +1663,6 @@ ufs_mem_hc: ufshc@...4000 {
>>   
>>   			iommus = <&apps_smmu 0xe0 0x0>;
>>   
>> -			interconnects = <&aggre1_noc MASTER_UFS_MEM &mc_virt SLAVE_EBI1>,
>> -					<&gem_noc MASTER_APPSS_PROC &config_noc SLAVE_UFS_MEM_CFG>;
>> -			interconnect-names = "ufs-ddr", "cpu-ufs";
>>   			clock-names =
>>   				"core_clk",
>>   				"bus_aggr_clk",
>> -- 
>> 2.26.1
>>