linux-kernel - Re: [PATCH v3 21/28] net: wan: Add framer framework support

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Message-ID: <CACRpkdZQ9_f6+9CseV1L_wGphHujFPAYXMjJfjUrzSZRakOBzg@mail.gmail.com>
Date:   Thu, 10 Aug 2023 13:17:09 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Herve Codina <herve.codina@...tlin.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Randy Dunlap <rdunlap@...radead.org>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 21/28] net: wan: Add framer framework support

Hi Herve,

On Wed, Aug 9, 2023 at 3:28 PM Herve Codina <herve.codina@...tlin.com> wrote:

> A framer is a component in charge of an E1/T1 line interface.
> Connected usually to a TDM bus, it converts TDM frames to/from E1/T1
> frames. It also provides information related to the E1/T1 line.
>
> The framer framework provides a set of APIs for the framer drivers
> (framer provider) to create/destroy a framer and APIs for the framer
> users (framer consumer) to obtain a reference to the framer, and
> use the framer.
>
> This basic implementation provides a framer abstraction for:
>  - power on/off the framer
>  - get the framer status (line state)
>  - be notified on framer status changes
>  - get/set the framer configuration
>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

I love it, very clear commit message telling us what it is all
about.

The placement in the WAN subsystem also hints that this has
something to do with long distance links (relative to something)
so maybe mention that?

> +menu "Framer Subsystem"
> +
> +config GENERIC_FRAMER
> +       bool "Framer Core"
> +       help
> +         Generic Framer support.
> +
> +         This framework is designed to provide a generic interface for framer
> +         devices present in the kernel. This layer will have the generic
> +         API by which framer drivers can create framer using the framer
> +         framework and framer users can obtain reference to the framer.
> +         All the users of this framework should select this config.

But this description just says this is a framing framer that frames frames ;)

So please copy some of the nice description from the commit message
into this Kconfig helptext.

Is "long distance link time division multiplexing (TDM) framer" more
to the point for example? Or is the ambition to frame other multiplexing
techniques as well with this subsystem? Such as FDM? Then mention
that.

Yours,
Linus Walleij