linux-kernel - Re: [PATCH RFC 2/2] usb: typec: Add support for Parade PS8830 Type-C Retimer

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Message-ID: <Zthet0QqChgGWJAe@hovoldconsulting.com>
Date: Wed, 4 Sep 2024 15:20:55 +0200
From: Johan Hovold <johan@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.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>,
	Rajendra Nayak <quic_rjendra@...cinc.com>,
	Sibi Sankar <quic_sibis@...cinc.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Trilok Soni <quic_tsoni@...cinc.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] usb: typec: Add support for Parade PS8830 Type-C
 Retimer

On Tue, Sep 03, 2024 at 09:27:45AM +0200, Johan Hovold wrote:
> On Thu, Aug 29, 2024 at 09:44:26PM +0300, Abel Vesa wrote:
> > The Parade PS8830 is a Type-C muti-protocol retimer controlled over I2C.
> > It provides both altmode and orientation handling.
> > 
> > Add a driver with support for the following modes:
> >  - DP 4lanes
> >  - USB3
> >  - DP 2lanes + USB3
> > 
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>

> > +	retimer->supplies[0].supply = "vdd33";
> > +	retimer->supplies[1].supply = "vdd18";
> > +	retimer->supplies[2].supply = "vdd15";
> 
> vdd115?
> 
> > +	retimer->supplies[3].supply = "vcc";

I took a look at the schematics and it seems like all but one of the
above supply names are wrong and that some are missing. "vcc" also does
not exist in either the binding or dt patches you sent separately.

>From what I can tell the supplies are:

	vdd		1.15 V
	vdd33		3.3 V
	vdd33_cap	3.3 V
	vddat		1.15 V
	vddar		1.15 V
	vddio		1.8 V

Also, have you checked that there are no ordering constraints between
the supplies?

Johan