linux-kernel - Re: [PATCH 14/14] arm64: dts: qcom: Add The Fairphone (Gen. 6)

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Message-ID: <6d4e77b3-0f92-44dd-b9b0-3129a5f3785b@oss.qualcomm.com>
Date: Fri, 27 Jun 2025 16:34:23 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>, Vinod Koul <vkoul@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Robert Marko <robimarko@...il.com>,
        Das Srinagesh <quic_gurus@...cinc.com>,
        Thomas Gleixner
 <tglx@...utronix.de>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Amit Kucheria <amitk@...nel.org>,
        Thara Gopinath <thara.gopinath@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-crypto@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-mmc@...r.kernel.org
Subject: Re: [PATCH 14/14] arm64: dts: qcom: Add The Fairphone (Gen. 6)

On 6/27/25 1:33 PM, Luca Weiss wrote:
> On Wed Jun 25, 2025 at 4:38 PM CEST, Konrad Dybcio wrote:
>> On 6/25/25 11:23 AM, Luca Weiss wrote:
>>> Add a devicetree for The Fairphone (Gen. 6) smartphone, which is based
>>> on the SM7635 SoC.
>>
>> [...]
>>
>>> +	/* Dummy panel for simple-framebuffer dimension info */
>>> +	panel: panel {
>>> +		compatible = "boe,bj631jhm-t71-d900";
>>> +		width-mm = <65>;
>>> +		height-mm = <146>;
>>> +	};
>>
>> I haven't ran through all the prerequisite-xx-id, but have
>> you submitted a binding for this?
> 
> Actually not, kind of forgot about this. I believe I can create a
> (mostly?) complete binding for the panel, but this simple description
> for only width-mm & height-mm will differ from the final one, which will
> have the DSI port, pinctrl, reset-gpios and various supplies.
> 
> I think I'll just drop it from v2 and keep it locally only, to get the
> simpledrm scaling right.

Yeah I think that'd be best in general

> 
>>
>> [...]
>>
>>> +	reserved-memory {
>>> +		/*
>>> +		 * ABL is powering down display and controller if this node is
>>> +		 * not named exactly "splash_region".
>>> +		 */
>>> +		splash_region@...40000 {
>>> +			reg = <0x0 0xe3940000 0x0 0x2b00000>;
>>> +			no-map;
>>> +		};
>>> +	};
>>
>> :/ maybe we can convince ABL not to do it..
> 
> Yes, we talked about that. I will look into getting "splash-region" and
> "splash" also into the ABL (edk2) build for the phone. Still won't
> resolve that for any other brand of devices.

Gotta start small! Maybe framebuffer@ would be more """idiomatic"""
but potayto/potahto

> 
>>
>> [...]
>>
>>> +		vreg_l12b: ldo12 {
>>> +			regulator-name = "vreg_l12b";
>>> +			/*
>>> +			 * Skip voltage voting for UFS VCC.
>>> +			 */
>>
>> Why so?
> 
> From downstream:
> 
> 		/*
> 		 * This is for UFS Peripheral,which supports 2 variants
> 		 * UFS 3.1 ,and UFS 2.2 both require different voltages.
> 		 * Hence preventing voltage voting as per previous targets.
> 		 */
> 
> I haven't (successfully) brought up UFS yet, so I haven't looked more
> into that.
> 
> The storage on FP6 is UFS 3.1 though fwiw.

Hm.. can you check what debugfs says about the voltage at runtime
(on downstream)? I'd assume you won't be shipping two kinds anyway

[...]

>>> +&pm8550vs_d {
>>> +	status = "disabled";
>>> +};
>>> +
>>> +&pm8550vs_e {
>>> +	status = "disabled";
>>> +};
>>> +
>>> +&pm8550vs_g {
>>> +	status = "disabled";
>>> +};
>>
>> Hm... perhaps we should disable these by deafult
> 
> Do you want me to do this in this patchset, or we clean this up later at
> some point? I'd prefer not adding even more dependencies to my patch
> collection right now.

I can totally hear that..

Let's include it in this patchset, right before SoC addition
I don't think there's any pm8550vs users trying to get merged in
parallel so it should be OK

[...]

>>> +&usb_1 {
>>> +	dr_mode = "otg";
>>> +
>>> +	/* USB 2.0 only */
>>
>> Because there's no usb3phy description yet, or due to hw design?
> 
> HW design. Funnily enough with clk_ignore_unused this property is not
> needed, and USB(2.0) works fine then. Just when (I assume) the USB3
> clock is turned off which the bootloader has enabled, USB stops working.

The USB controller has two possible clock sources: the PIPE_CLK that
the QMPPHY outputs, or the UTMI clock (qcom,select-utmi-as-pipe-clk).

Because you said there's no USB3, I'm assuming DP-over-Type-C won't
be a thing either? :(

Konrad