netdev - Re: [PATCH net-next] net: pcs: xpcs: depends on PHYLINK in Kconfig

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Date:   Thu, 23 Jun 2022 16:00:43 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux@...linux.org.uk, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>, davem@...emloft.net,
        Eric Dumazet <edumazet@...gle.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH net-next] net: pcs: xpcs: depends on PHYLINK in Kconfig

On Wed, 2022-06-22 at 16:12 -0700, Jakub Kicinski wrote:
> On Wed, 22 Jun 2022 17:42:13 +0200 Paolo Abeni wrote:
> > @Jakub: please let me know if you prefer to go ahead yourself, or me
> > sending a v3 with 'depends PHYLINK' + the above (or any other option ;)
> 
> [resending, sorry, Russell let me know that my MUA broke the headers]
> 
> Well, IDK. You said "depends PHYLINK" which makes me feel like I
> haven't convinced you at all :)  Unless you mean add the dependency
> on the consumers not on PCS_XPCS itself, but that's awkward.

Well, I have misread your previous email.
> 
> What I was saying is that "depends" in a symbol which is only
> "select"ed by other symbols makes no sense. IIUC "select" does not
> visit dependencies, so putting "depends" on an user-invisible symbol
> (i.e. symbol without a prompt) achieves nothing.
> 
> So PCS_XPCS can have no "depends" if we hide it.
> 
> The way I see it - PHYLINK already selects MDIO_DEVICE. So we can drop
> the MDIO business from PCS_XPCS, add "select PHYLINK", hide it by
> removing the prompt, and we're good. Then again, I admit I have not
> tested this at all so I could be speaking gibberish...
> 
> diff --git a/drivers/net/pcs/Kconfig b/drivers/net/pcs/Kconfig
> index 22ba7b0b476d..f778e5155fae 100644
> --- a/drivers/net/pcs/Kconfig
> +++ b/drivers/net/pcs/Kconfig
> @@ -6,8 +6,8 @@
>  menu "PCS device drivers"
>  
>  config PCS_XPCS
> -       tristate "Synopsys DesignWare XPCS controller"
> -       depends on MDIO_DEVICE && MDIO_BUS
> +       tristate
> +       select PHYLINK
>         help
>           This module provides helper functions for Synopsys DesignWare XPCS
> 

AFAICS it should works, thanks

Paolo