linux-kernel - Re: [RFC PATCH v2 3/3] arm64: dts: qcom: sm6350: Use specific qmpphy compatible

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Date:   Fri, 25 Nov 2022 11:11:27 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Luca Weiss <luca.weiss@...rphone.com>
Cc:     linux-arm-msm@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 3/3] arm64: dts: qcom: sm6350: Use specific qmpphy
 compatible

On Fri, Nov 25, 2022 at 10:27:49AM +0100, Luca Weiss wrote:
> The sc7180 phy compatible works fine for some cases, but it turns out
> sm6350 does need proper phy configuration in the driver, so use the
> newly added sm6350 compatible.
> 
> Because the sm6350 compatible is using the new binding, we need to
> change the node quite a bit to match it.
> 
> This fixes qmpphy init when no USB cable is plugged in during bootloader
> stage.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
> @Johan Hovold, in this patch there's also the question about cfg_ahb,
> power-domains but I'm also not happy about using the
> QMP_USB43DP_USB3_PHY define for the phy reference. Do you think it's a
> good idea to introduce e.g. QMP_USB3DP_USB3_PHY with the same value so
> it's essentially just an alias to the other?

We had that discussion the other week and I believe we agreed that
reusing the define with a more general infix (USB43DP) was fine as it's
just a name for a constant (and the USB43DP constants will be a superset
of the ones needed for USB3-DP PHYs).

> This series is tested on next-20221124 with next branch of linux-phy
> repo (commit bea3ce759b46) merged in.

The dependencies should all be in linux-next as of today.

>  arch/arm64/boot/dts/qcom/sm6350.dtsi | 46 +++++++---------------------
>  1 file changed, 11 insertions(+), 35 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm6350.dtsi b/arch/arm64/boot/dts/qcom/sm6350.dtsi
> index 0f01ff4feb55..923c8bb7e5f8 100644
> --- a/arch/arm64/boot/dts/qcom/sm6350.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm6350.dtsi
> @@ -11,6 +11,7 @@
>  #include <dt-bindings/interconnect/qcom,sm6350.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/mailbox/qcom-ipcc.h>
> +#include <dt-bindings/phy/phy-qcom-qmp.h>
>  #include <dt-bindings/power/qcom-rpmpd.h>
>  #include <dt-bindings/soc/qcom,rpmh-rsc.h>
>  
> @@ -1119,50 +1120,25 @@ usb_1_hsphy: phy@...3000 {
>  			resets = <&gcc GCC_QUSB2PHY_PRIM_BCR>;
>  		};
>  
> -		usb_1_qmpphy: phy@...9000 {
> -			compatible = "qcom,sc7180-qmp-usb3-dp-phy";
> -			reg = <0 0x088e9000 0 0x200>,
> -			      <0 0x088e8000 0 0x40>,
> -			      <0 0x088ea000 0 0x200>;
> -			status = "disabled";
> -			#address-cells = <2>;
> -			#size-cells = <2>;
> -			ranges;
> +		usb_1_qmpphy: phy@...8000 {
> +			compatible = "qcom,sm6350-qmp-usb3-dp-phy";
> +			reg = <0 0x088e8000 0 0x3000>;
>  
>  			clocks = <&gcc GCC_USB3_PRIM_PHY_AUX_CLK>,
>  				 <&xo_board>,
>  				 <&rpmhcc RPMH_QLINK_CLK>,
> -				 <&gcc GCC_USB3_PRIM_PHY_COM_AUX_CLK>;
> -			clock-names = "aux", "cfg_ahb", "ref", "com_aux";
> +				 <&gcc GCC_USB3_PRIM_PHY_COM_AUX_CLK>,
> +				 <&gcc GCC_USB3_PRIM_PHY_PIPE_CLK>;
> +			clock-names = "aux", "cfg_ahb", "ref", "com_aux", "usb3_pipe";

As I mentioned in my reply to the binding, we should double check the
vendor dts and hardware documentation (if possible) before settling on
these names which appears to just have been reused from some older
platform.

>  
>  			resets = <&gcc GCC_USB3_DP_PHY_PRIM_BCR>,
>  				 <&gcc GCC_USB3_PHY_PRIM_BCR>;
>  			reset-names = "phy", "common";
>  
> -			usb_1_ssphy: usb3-phy@...9200 {
> -				reg = <0 0x088e9200 0 0x200>,
> -				      <0 0x088e9400 0 0x200>,
> -				      <0 0x088e9c00 0 0x400>,
> -				      <0 0x088e9600 0 0x200>,
> -				      <0 0x088e9800 0 0x200>,
> -				      <0 0x088e9a00 0 0x100>;
> -				#clock-cells = <0>;
> -				#phy-cells = <0>;
> -				clocks = <&gcc GCC_USB3_PRIM_PHY_PIPE_CLK>;
> -				clock-names = "pipe0";
> -				clock-output-names = "usb3_phy_pipe_clk_src";
> -			};
> +			#clock-cells = <1>;
> +			#phy-cells = <1>;
>  
> -			dp_phy: dp-phy@...a200 {
> -				reg = <0 0x088ea200 0 0x200>,
> -				      <0 0x088ea400 0 0x200>,
> -				      <0 0x088eac00 0 0x400>,
> -				      <0 0x088ea600 0 0x200>,
> -				      <0 0x088ea800 0 0x200>,
> -				      <0 0x088eaa00 0 0x100>;

Note that these registers were not correct to begin with and a fix has
been posted here:

	https://lore.kernel.org/all/20221111094729.11842-2-johan+linaro@kernel.org/

Will hopefully show up in linux-next next week so this can be rebased on
top.

> -				#phy-cells = <0>;
> -				#clock-cells = <1>;
> -			};
> +			status = "disabled";
>  		};
>  
>  		dc_noc: interconnect@...0000 {
> @@ -1236,7 +1212,7 @@ usb_1_dwc3: usb@...0000 {
>  				snps,dis_enblslpm_quirk;
>  				snps,has-lpm-erratum;
>  				snps,hird-threshold = /bits/ 8 <0x10>;
> -				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
> +				phys = <&usb_1_hsphy>, <&usb_1_qmpphy QMP_USB43DP_USB3_PHY>;
>  				phy-names = "usb2-phy", "usb3-phy";
>  			};
>  		};

Johan