linux-kernel - Re: [PATCH v4 14/14] tty: gunyah: Add tty console driver for RM Console Services

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Date:   Tue, 11 Oct 2022 08:22:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Elliot Berman <quic_eberman@...cinc.com>
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Bjorn Andersson <quic_bjorande@...cinc.com>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 14/14] tty: gunyah: Add tty console driver for RM
 Console Services

On Mon, Oct 10, 2022 at 01:58:00PM -0700, Elliot Berman wrote:
> 
> 
> On 10/10/2022 1:23 PM, Greg Kroah-Hartman wrote:
> > On Sun, Oct 09, 2022 at 01:59:21PM -0700, Elliot Berman wrote:
> > > 
> > > > > > On 10/7/2022 12:40 AM, Greg Kroah-Hartman wrote:
> > > > On Thu, Oct 06, 2022 at 10:59:51PM -0700, Elliot Berman wrote:
> > > > > 
> > > > > "GH" is the shorthand we've been using for "Gunyah". I didn't find
> > > > > documentation for dynamically assigned char devices, but if it exists, I can
> > > > > add entry for ttyGH.
> > > > 
> > > > Why use a new name at all?  Why not stick with the existing tty names
> > > > and device numbers?
> > > > 
> > > 
> > > I can use hvc framework, although driver-level buffering is needed on
> > > both the get_chars/put_chars paths because:
> > 
> > I'm not asking about the framework (although that is a good question,
> > you need to document why this has to be new.)  I'm asking why pick a new
> > name?  You will not have a name conflict in your system with this device
> > with any other tty name right?
> > 
> 
> That's correct, I didn't see any other instances of "ttyGH" in kernel.

Do you see any instances of ttyS?  Any other existing name?  Why pick a
new name at all?

And if you do pick a new name, you need to document it really really
well, not bury it downn within the tty driver code.

thanks,

greg k-h