netdev - Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

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Message-ID: <20230509075247.2df8f5aa@kernel.org>
Date: Tue, 9 May 2023 07:52:47 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jiri Pirko <jiri@...nulli.us>
Cc: Paolo Abeni <pabeni@...hat.com>, "Kubalewski, Arkadiusz"
 <arkadiusz.kubalewski@...el.com>, Vadim Fedorenko
 <vadim.fedorenko@...ux.dev>, Vadim Fedorenko <vadfed@...a.com>, Jonathan
 Lemon <jonathan.lemon@...il.com>, poros <poros@...hat.com>, mschmidt
 <mschmidt@...hat.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 linux-arm-kernel@...ts.infradead.org, "linux-clk@...r.kernel.org"
 <linux-clk@...r.kernel.org>, "Olech, Milena" <milena.olech@...el.com>,
 "Michalik, Michal" <michal.michalik@...el.com>
Subject: Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

On Tue, 9 May 2023 09:53:07 +0200 Jiri Pirko wrote:
> >Yup. Even renaming EXT to something that's less.. relative :(  
> 
> Suggestion?

Well, is an SMT socket on the board an EXT pin?
Which is why I prefer PANEL.

> >> Well sure, in case there is no "label" attr for the rest of the types.
> >> Which I believe it is, for the ice implementation in this patchset.
> >> Otherwise, there is no way to distinguish between the pins.
> >> To have multiple attrs for label for multiple pin types does not make
> >> any sense to me, that was my point.  
> >
> >Come on, am I really this bad at explaining this?  
> 
> Or perhaps I'm just slow.
> 
> >If we make a generic "label" attribute driver authors will pack
> >everything they want to expose to the user into it, and then some.  
> 
> What's difference in generic label string attr and type specific label
> string attr. What is stopping driver developers to pack crap in either
> of these 2. Perhaps I'm missing something. Could you draw examples?
> 
> >So we need attributes which will feel *obviously* *wrong* to abuse.  
> 
> Sure, I get what you say and agree. I'm just trying to find out the
> actual attributes :)

PANEL label must match the name on the panel. User can take the card
into their hand, look at the front, and there should be a label/sticker/
/engraving which matches exactly what the kernel reports.

If the label is printed on the board it's a BOARD_LABEL, if it's the
name of a trace in board docs it's a BOARD_TRACE, if it's a pin of 
the ASIC it's a PACKAGE_PIN.

If it's none of those, or user does not have access to the detailed
board / pinout - don't use the label.