linux-kernel - Re: [PATCH 06/13] ARM: dts: qcom: enable usb phy by default for ipq8064

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Message-ID: <837c6cd8-72d9-e7c8-dfd9-e171d809f0bf@somainline.org>
Date:   Wed, 6 Jul 2022 15:33:25 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jonathan McDowell <noodles@...th.li>
Subject: Re: [PATCH 06/13] ARM: dts: qcom: enable usb phy by default for
 ipq8064



On 6.07.2022 14:59, Christian Marangi wrote:
> On Wed, Jul 06, 2022 at 03:04:44PM +0200, Konrad Dybcio wrote:
>>
>>
>> On 5.07.2022 15:39, Christian Marangi wrote:
>>> Enable usb phy by default. When the usb phy were pushed, half of them
>>> were flagged as disabled by mistake. Fix this to correctly init dwc3
>>> node on any ipq8064 based SoC.
>> Are you sure they are used on *all* devices? If not, you will
>> lose power by enabling unused hw..
>>
>> Konrad
> 
> Well there could be device that have no usb at all... so honestly
> enabling one of them is also wrong. Should I disable the other and
> enable it for the upstream device?
We generally disable everything that's not obviously being used by the
SoC internally or is required for components like these for function
(think clock controllers etc) and enable peripherals on a per-device
basis.

Konrad
> 
> Also it's all handled by dummy vbus so i think we can ignore the losing
> power thing. (this thing is old)
> 
>>>
>>> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
>>> Tested-by: Jonathan McDowell <noodles@...th.li>
>>> ---
>>>  arch/arm/boot/dts/qcom-ipq8064.dtsi | 4 ----
>>>  1 file changed, 4 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/qcom-ipq8064.dtsi b/arch/arm/boot/dts/qcom-ipq8064.dtsi
>>> index b2faa4a067e9..9c32c637ea46 100644
>>> --- a/arch/arm/boot/dts/qcom-ipq8064.dtsi
>>> +++ b/arch/arm/boot/dts/qcom-ipq8064.dtsi
>>> @@ -1177,8 +1177,6 @@ hs_phy_0: phy@...f8800 {
>>>  			clocks = <&gcc USB30_0_UTMI_CLK>;
>>>  			clock-names = "ref";
>>>  			#phy-cells = <0>;
>>> -
>>> -			status = "disabled";
>>>  		};
>>>  
>>>  		ss_phy_0: phy@...f8830 {
>>> @@ -1187,8 +1185,6 @@ ss_phy_0: phy@...f8830 {
>>>  			clocks = <&gcc USB30_0_MASTER_CLK>;
>>>  			clock-names = "ref";
>>>  			#phy-cells = <0>;
>>> -
>>> -			status = "disabled";
>>>  		};
>>>  
>>>  		usb3_0: usb3@...f8800 {
>