linux-kernel - Re: [PATCH 7/9] serial: Add Tegra Combined UART driver

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Message-ID: <20181112180301.GB28739@kroah.com>
Date:   Mon, 12 Nov 2018 10:03:01 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Jiri Slaby <jslaby@...e.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Timo Alho <talho@...dia.com>, Pekka Pessi <ppessi@...dia.com>,
        Mika Liljeberg <mliljeberg@...dia.com>,
        linux-tegra@...r.kernel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] serial: Add Tegra Combined UART driver

On Mon, Nov 12, 2018 at 04:30:14PM +0100, Thierry Reding wrote:
> On Fri, Nov 09, 2018 at 09:05:26AM -0800, Greg Kroah-Hartman wrote:
> > On Fri, Oct 26, 2018 at 01:16:36PM +0200, Thierry Reding wrote:
> > > From: Thierry Reding <treding@...dia.com>
> > > 
> > > The Tegra Combined UART (TCU) is a mailbox-based mechanism that allows
> > > multiplexing multiple "virtual UARTs" into a single hardware serial
> > > port. The TCU is the primary serial port on Tegra194 devices.
> > > 
> > > Add a TCU driver utilizing the mailbox framework, as the used mailboxes
> > > are part of Tegra HSP blocks that are already controlled by the Tegra
> > > HSP mailbox driver.
> > > 
> > > Based on work by  Mikko Perttunen <mperttunen@...dia.com>.
> > > 
> > > Signed-off-by: Thierry Reding <treding@...dia.com>
> > 
> > Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Thanks. I just sent out v2 addressing Pekka's comments on the series.
> But I'm slightly confused now. Are you expecting anyone else to pick
> this up? There are technically no build time dependencies between any
> of these patches, so it should be fine to pick them all into the
> corresponding subsystem trees.

Ah, I thought there was a built-time dependancy, that's why I gave my
ack.

> Perhaps the only thing to note is that there is a runtime dependency
> from this patch on patches 1 and 2 in the series. Patch 1 is required to
> make blocking a mailbox possible in interrupt context, which we need in
> the TCU driver because the TTY and console paths do end up calling the
> mbox_send_message() from interrupt context. Patch 2 is only required at
> runtime if the two mailboxes are provided by different instances of the
> HSP block (which they are for TCU on Tegra194).
> 
> Would you prefer for Jassi to pick up the TCU patch along with the
> mailbox core and driver changes so that we deal with the runtime
> dependencies that way?
> 
> Alternatively, if Jassi is okay with the mailbox changes, I can pick up
> all of the v2 series of the patches into stable branches for v4.21, deal
> with the dependencies there and send out pull requests for everyone to
> merge into their subsystem trees.

I don't really care either way, whatever is easiest for you all is fine
with me.

thanks,

greg k-h