linux-kernel - Re: [PATCH 08/10] powerpc/fsl: Make serial ports compatible with ns16550a

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Date:   Mon, 23 Mar 2020 11:59:17 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        Mans Rullgard <mans@...sr.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 08/10] powerpc/fsl: Make serial ports compatible with ns16550a

On Fri, Mar 20, 2020 at 11:41 AM Lubomir Rintel <lkundrak@...sk> wrote:
>
> There are separate compatible strings for ns16550 and ns16550a and the
> Freescale serial port is compatible with the latter one, with working
> FIFO.

I don't think changing this is right. First, 'ns16550' is what's
documented in the DT spec (and ePAPR which it's based on).

Second, these dts files are pretty mature/stable, so I'm less inclined
to change them. AFAICT, this change either enables the fifo (which
would be an untested change in behavior) or has no effect because the
fifo is auto-detected.

> Use the appropriate compatible string that is also consistent with ARM64
> Freescale boards and thus avoiding one special case in the binding schema.

Well, that's annoying...

Rob