linux-kernel - Re: [PATCH v3 3/3] arm64: qcom: sc7280: Move phy, perst to root port node

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: <pb7rsvlslvyqlheyhwwjgje6iiolgkj6cqfsi6jmvetritc7lr@jxndd5rfzbfy>
Date: Tue, 3 Jun 2025 12:22:41 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, Rob Herring <robh@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, cros-qcom-dts-watchers@...omium.org, 
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, quic_vbadigan@...cinc.com, quic_mrana@...cinc.com
Subject: Re: [PATCH v3 3/3] arm64: qcom: sc7280: Move phy, perst to root port
 node

On Tue, Jun 03, 2025 at 12:03:01PM +0530, Krishna Chaitanya Chundru wrote:
> 
> 
> On 6/1/2025 12:35 PM, Manivannan Sadhasivam wrote:
> > On Sat, Apr 19, 2025 at 10:49:26AM +0530, Krishna Chaitanya Chundru wrote:
> > > There are many places we agreed to move the wake and perst gpio's
> > > and phy etc to the pcie root port node instead of bridge node[1].
> > 
> > Same comment as binding patch applies here.
> > 
> > > 
> > > So move the phy, phy-names, wake-gpio's in the root port.
> > 
> > You are not moving any 'wake-gpios' property.
> > 
> ack I will remove it.
> > > There is already reset-gpio defined for PERST# in pci-bus-common.yaml,
> > > start using that property instead of perst-gpio.
> > > 
> > > [1] https://lore.kernel.org/linux-pci/20241211192014.GA3302752@bhelgaas/
> > > 
> > > Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> > > ---
> > >   arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts   | 5 ++++-
> > >   arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi | 5 ++++-
> > >   arch/arm64/boot/dts/qcom/sc7280-idp.dtsi       | 5 ++++-
> > >   arch/arm64/boot/dts/qcom/sc7280.dtsi           | 6 ++----
> > >   4 files changed, 14 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > > index 7a36c90ad4ec8b52f30b22b1621404857d6ef336..3dd58986ad5da0f898537a51715bb5d0fecbe100 100644
> > > --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > > +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > > @@ -709,8 +709,11 @@ &mdss_edp_phy {
> > >   	status = "okay";
> > >   };
> > > +&pcie1_port0 {
> > > +	reset-gpios = <&tlmm 2 GPIO_ACTIVE_LOW>;
> > > +};
> > > +
> > >   &pcie1 {
> > > -	perst-gpios = <&tlmm 2 GPIO_ACTIVE_LOW>;
> > >   	pinctrl-0 = <&pcie1_reset_n>, <&pcie1_wake_n>;
> > >   	pinctrl-names = "default";
> > 
> > What about the pinctrl properties? They should also be moved.
> > 
> pinctrl can still reside in the host bridge node, which has
> all the gpio's for all the root ports. If we move them to the
> root ports we need to explicitly apply pinctrl settings as these
> not tied with the driver yet.
> 

If the DT node is associated with a device, then the driver core should bind the
pinctrl pins and configure them. Is that not happening here?

- Mani

-- 
மணிவண்ணன் சதாசிவம்