linux-kernel - Re: [PATCH v3 11/14] phy: qcom: qmp-usbc: Finalize USB/DP switchable PHY support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <inxoswyre3qalrb3dj3lz3b5vmnpnkyy3hh4oum3z6p7yqlo2v@7g67yvvb25tc>
Date: Wed, 27 Aug 2025 19:14:55 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, fange.zhang@....qualcomm.com,
        yongxing.mou@....qualcomm.com, tingwei.zhang@....qualcomm.com,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, quic_lliu6@...cinc.com
Subject: Re: [PATCH v3 11/14] phy: qcom: qmp-usbc: Finalize USB/DP switchable
 PHY support

On Wed, Aug 27, 2025 at 08:34:39PM +0800, Xiangxu Yin wrote:
> 
> On 8/20/2025 7:42 PM, Dmitry Baryshkov wrote:
> > On Wed, Aug 20, 2025 at 05:34:53PM +0800, Xiangxu Yin wrote:
> >> Complete USB/DP switchable PHY integration by adding DP clock
> >> registration, aux bridge setup, and DT parsing. Implement clock
> >> provider logic for USB and DP branches, and extend PHY translation
> >> to support both USB and DP instances.
> >>
> >> Signed-off-by: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
> >> ---
> >>  drivers/phy/qualcomm/phy-qcom-qmp-usbc.c | 331 ++++++++++++++++++++++++++++---
> >>  1 file changed, 299 insertions(+), 32 deletions(-)
> >>
> >>  static int qmp_usbc_probe(struct platform_device *pdev)
> >>  {
> >>  	struct device *dev = &pdev->dev;
> >> @@ -1703,16 +1944,32 @@ static int qmp_usbc_probe(struct platform_device *pdev)
> >>  	if (ret)
> >>  		return ret;
> >>  
> >> -	/* Check for legacy binding with child node. */
> >> -	np = of_get_child_by_name(dev->of_node, "phy");
> >> -	if (np) {
> >> -		ret = qmp_usbc_parse_usb_dt_legacy(qmp, np);
> >> -	} else {
> >> +	if (qmp->cfg->type == QMP_PHY_USBC_USB3_DP) {
> > Should not be necessary.
> 
> 
> Got it. I’ll merge the parsing logic into a single qmp_usbc_parse_dt function.
> 
> Also, I checked the compatible strings in the dtsi files for this PHY series
> looks like no current product uses the legacy binding. 
> I’ll drop qmp_usbc_parse_usb_dt_legacy in the next version.


No. It's _legacy_, it has been implemented in order to support old DTs,
which existed at some point but then were refactored into the current
state. You can't randomly drop DT support.

> 
> 
> >>  		np = of_node_get(dev->of_node);
> >> -		ret = qmp_usbc_parse_usb_dt(qmp);
> >> +
> >> +		ret = qmp_usbc_parse_usb3dp_dt(qmp);
> >> +		if (ret) {
> >> +			dev_err(qmp->dev, "parse DP dt fail ret=%d\n", ret);
> >> +			goto err_node_put;
> >> +		}
> >> +
> >> +		ret = drm_aux_bridge_register(dev);
> >> +		if (ret) {
> >> +			dev_err(qmp->dev, "aux bridge reg fail ret=%d\n", ret);
> >> +			goto err_node_put;
> >> +		}

-- 
With best wishes
Dmitry