linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: x1e80100-crd: Add USB multiport fingerprint reader

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Message-ID: <Z07bgH5vVk44zuEH@hovoldconsulting.com>
Date: Tue, 3 Dec 2024 11:20:48 +0100
From: Johan Hovold <johan@...nel.org>
To: Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: 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>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Abel Vesa <abel.vesa@...aro.org>,
	Krishna Kurapati <quic_kriskura@...cinc.com>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>, linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: x1e80100-crd: Add USB multiport
 fingerprint reader

[ +CC: Krishna, Thinh and the USB list ]

On Mon, Nov 18, 2024 at 11:34:29AM +0100, Stephan Gerhold wrote:
> The X1E80100 CRD has a Goodix fingerprint reader connected to the USB
> multiport controller on eUSB6. All other ports (including USB super-speed
> pins) are unused.
> 
> Set it up in the device tree together with the NXP PTN3222 repeater.
> 
> Signed-off-by: Stephan Gerhold <stephan.gerhold@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/x1e80100-crd.dts | 48 +++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> index 39f9d9cdc10d..44942931c18f 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> @@ -735,6 +735,26 @@ keyboard@3a {
>  	};
>  };
>  
> +&i2c5 {
> +	clock-frequency = <400000>;
> +
> +	status = "okay";
> +
> +	eusb6_repeater: redriver@4f {
> +		compatible = "nxp,ptn3222";
> +		reg = <0x4f>;

The driver does not currently check that there's actually anything at
this address. Did you verify that this is the correct address? 

(Abel is adding a check to the driver as we speak to catch any such
mistakes going forward).

> +		#phy-cells = <0>;

nit: I'd put provider properties like this one last.

> +		vdd3v3-supply = <&vreg_l13b_3p0>;
> +		vdd1v8-supply = <&vreg_l4b_1p8>;

Sort by supply name?

> +		reset-gpios = <&tlmm 184 GPIO_ACTIVE_LOW>;
> +
> +		pinctrl-0 = <&eusb6_reset_n>;
> +		pinctrl-names = "default";
> +	};
> +};
> +
>  &i2c8 {
>  	clock-frequency = <400000>;
>  
> @@ -1047,6 +1067,14 @@ edp_reg_en: edp-reg-en-state {
>  		bias-disable;
>  	};
>  
> +	eusb6_reset_n: eusb6-reset-n-state {
> +		pins = "gpio184";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-disable;
> +		output-low;

I don't think the pin config should assert reset, that should be up to
the driver to control.

> +	};
> +
>  	hall_int_n_default: hall-int-n-state {
>  		pins = "gpio92";
>  		function = "gpio";
> @@ -1260,3 +1288,23 @@ &usb_1_ss2_dwc3_hs {
>  &usb_1_ss2_qmpphy_out {
>  	remote-endpoint = <&pmic_glink_ss2_ss_in>;
>  };
> +
> +&usb_mp {
> +	status = "okay";
> +};
> +
> +&usb_mp_dwc3 {
> +	/* Limit to USB 2.0 and single port */
> +	maximum-speed = "high-speed";
> +	phys = <&usb_mp_hsphy1>;
> +	phy-names = "usb2-1";
> +};

The dwc3 driver determines (and acts on) the number of ports based on
the port interrupts in DT and controller capabilities. 

I'm not sure we can (should) just drop the other HS PHY and the SS PHYs
that would still be there in the SoC (possibly initialised by the boot
firmware).

I had a local patch to enable the multiport controller (for the suspend
work) and I realise that you'd currently need to specify a repeater also
for the HS PHY which does not have one, but that should be possible to
fix somehow.

> +
> +&usb_mp_hsphy1 {
> +	vdd-supply = <&vreg_l2e_0p8>;
> +	vdda12-supply = <&vreg_l3e_1p2>;
> +
> +	phys = <&eusb6_repeater>;
> +
> +	status = "okay";
> +};

Johan