linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: Add support for Pixel 3 and Pixel 3 XL

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Message-ID: <7f686f1b-7cc7-428d-941d-82883decee49@ixit.cz>
Date: Thu, 30 Oct 2025 13:03:42 +0100
From: David Heidelberg <david@...t.cz>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: phodina@...tonmail.com, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 phone-devel@...r.kernel.org, Amit Pundir <amit.pundir@...aro.org>,
 Casey Connolly <casey@...nolly.tech>, Joel Selvaraj <foss@...lselvaraj.com>,
 Sumit Semwal <sumit.semwal@...aro.org>, Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: Add support for Pixel 3 and
 Pixel 3 XL

On 30/10/2025 12:32, Konrad Dybcio wrote:
> On 10/30/25 8:24 AM, David Heidelberg via B4 Relay wrote:
>> From: David Heidelberg <david@...t.cz>
>>
>> This adds initial device tree support for the following phones:
>>
>>   - Google Pixel 3 (blueline)
>>   - Google Pixel 3 XL (crosshatch)
> 
> [...]
> 
>> +#include <dt-bindings/arm/qcom,ids.h>
>> +#include <dt-bindings/dma/qcom-gpi.h>
>> +#include <dt-bindings/input/linux-event-codes.h>
>> +#include <dt-bindings/interrupt-controller/irq.h>
>> +#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
>> +
>> +#include "sdm845.dtsi"
>> +#include "pm8998.dtsi"
>> +#include "pmi8998.dtsi"
>> +
>> +/delete-node/ &mpss_region;
>> +/delete-node/ &venus_mem;
>> +/delete-node/ &cdsp_mem;
>> +/delete-node/ &mba_region;
>> +/delete-node/ &slpi_mem;
>> +/delete-node/ &spss_mem;
>> +/delete-node/ &rmtfs_mem;
>> +
>> +/ {
>> +	chassis-type = "handset";
>> +	qcom,board-id = <0x00021505 0>;
>> +	qcom,msm-id = <QCOM_ID_SDM845 0x20001>;
>> +
>> +	aliases {
>> +		serial0 = &uart9;
>> +		serial1 = &uart6;
>> +	};
>> +
>> +	battery: battery {
>> +		compatible = "simple-battery";
>> +
>> +		status = "disabled";
> 
> You added support for both non-proto boards based on this platform,
> there is no usecase for you to disable the battery, remove this line

Should I keep the status = "okay" in the board files or drop it too?

> 
> [...]
> 
>> +	reserved-memory {
>> +		cont_splash_mem: splash@...00000 {
>> +			/* size to be updated by actual board */
>> +			reg = <0x0 0x9d400000 0x0>;
> 
> Don't define it here then
> 
> Normally the bootloader allocates a bigger buffer here BTW
> (although it shooould be reclaimable without issues)

Ok, I'll drop reg in next revision. Thou the reg is defined in the board 
files.

> 
>> +			no-map;
>> +
>> +			status = "disabled";
> 
> ditto
> 
> [...]
> 
>> +	gpio-keys {
>> +		compatible = "gpio-keys";
>> +		label = "Volume keys";
>> +		autorepeat;
>> +
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&volume_up_gpio>;
> 
> property-n
> property-names
> 
> in this order, please
> 
> [...]
> 
>> +&tlmm {
>> +	gpio-reserved-ranges = <0 4>, <81 4>;
> 
> Could you add a comment (like in x1-crd.dtsi) mentioning what these
> pins correspond to? Usually it's a fingerprint scanner or things like
> that

Sure, I looked into it, but I haven't found (so far) information about 
the assigned blocks. In next revision it'll be addressed :)>
>> +
>> +	touchscreen_reset: ts-reset-state {
>> +		pins = "gpio99";
>> +		function = "gpio";
>> +		drive-strength = <8>;
>> +		bias-pull-up;
>> +	};
>> +
>> +	touchscreen_pins: ts-pins-gpio-state {
>> +		pins = "gpio125";
>> +		function = "gpio";
>> +		drive-strength = <2>;
>> +		bias-disable;
>> +	};
>> +
>> +	touchscreen_i2c_pins: qup-i2c2-gpio-state {
>> +		pins = "gpio27", "gpio28";
>> +		function = "gpio";
>> +
>> +		drive-strength = <2>;
> 
> stray \n above
> 
>> +		bias-disable;
>> +	};
>> +};
>> +
>> +&uart6 {
>> +	pinctrl-0 = <&qup_uart6_4pin>;
>> +
>> +	status = "okay";
>> +	bluetooth {
> 
> Please add a \n above, to separate the properties from subnodes
> 
> [...]
> 
>> +&mdss {
>> +	/* until the panel is prepared */
>> +	status = "disabled";
>> +};
> 
> Is it not the same as on the little boy, except the resolution?
> (don't know, just asking)
It's completely different DDIC and panel. Generally, the DDIC has driver 
mainlined already (due being same as Samsung S9 DDIC), but I must extend 
support for the relevant panel.

Thanks for the review
WIP to v3 is here: https://gitlab.com/dhxx/linux/-/commits/b4/pixel-3

David

> 
> Konrad

-- 
David Heidelberg