linux-kernel - Re: [PATCH v2 2/7] pci: pwrctrl: add PCI pwrctrl driver for the UPD720201/UPD720202 USB 3.0 xHCI Host Controller

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Message-ID: <20260127222607.GA379611@bhelgaas>
Date: Tue, 27 Jan 2026 16:26:07 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Clark <robin.clark@....qualcomm.com>,
	Dmitry Baryshkov <lumag@...nel.org>,
	Abhinav Kumar <abhinav.kumar@...ux.dev>,
	Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Bartosz Golaszewski <brgl@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
	linux-usb@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 2/7] pci: pwrctrl: add PCI pwrctrl driver for the
 UPD720201/UPD720202 USB 3.0 xHCI Host Controller

On Tue, Jan 27, 2026 at 10:53:50PM +0100, Neil Armstrong wrote:
> On 1/27/26 16:53, Manivannan Sadhasivam wrote:
> > On Tue, Jan 27, 2026 at 10:57:29AM +0100, Neil Armstrong wrote:
> > > Add support fo the Renesas UPD720201/UPD720202 USB 3.0 xHCI Host Controller
> > > power control which connects over PCIe and requires specific power supplies
> > > to start up.
> > 
> > This driver only handles the supplies. So why can't you use the existing
> > pwrctrl-slot driver as a fallback?
> 
> It would fit with no change, but the name "slot" doesn't match the
> goal here, it's not a slot at all, it's an actual pcie IC.

"slot" is probably an overly specific name.  Maybe we can solve it
with a better name.