linux-kernel - Re: [PATCH v3 2/2] dt-bindings: mfd: Add DT compatible string "google,cros_ec

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Message-ID: <CAL_Jsq+Xr5m4pxqbeEt+Zwb1GCWPKN1KBmdVtyKAmVFiLf=r1A@mail.gmail.com>
Date:   Fri, 17 Jul 2020 13:02:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Bhanu Prakash Maiya <bhanumaiya@...omium.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Lee Jones <lee.jones@...aro.org>,
        Furquan Shaikh <furquan@...omium.org>,
        Raul E Rangel <rrangel@...omium.org>,
        Eric Peers <epeers@...gle.com>,
        Duncan Laurie <dlaurie@...gle.com>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] dt-bindings: mfd: Add DT compatible string "google,cros_ec_uart"

On Fri, Jul 17, 2020 at 3:53 AM Enric Balletbo i Serra
<enric.balletbo@...labora.com> wrote:
>
> Hi Rob,
>
> On 16/7/20 21:13, Rob Herring wrote:
> > On Wed, Jul 15, 2020 at 10:16:04PM -0700, Bhanu Prakash Maiya wrote:
> >> From: Bhanu Prakash Maiya <bhanumaiya@...omium.org>
> >>
> >> Add DT compatible string in
> >> Documentation/devicetree/bindings/mfd/cros_ec.txt
> >
> > Need to update this.
> >
> > With that,
> >
> > Reviewed-by: Rob Herring <robh@...nel.org>
> >
>
> So this is an ACPI-only driver that is instantiated by using the Device Tree
> namespace link in ACPI. I am not sure how to deal with this, but I suspect we
> need a proper OF binding definition before accept it.

In that case, NAK because I have no bandwidth or desire for ACPI
stuff. The DT bindings in ACPI concept is flawed.

> The driver gets at least the baudrate and the flowcontrol from ACPI resources,
> so I'm wondering if we should also add the properties in the device-tree
> description (although we're not able to really test because there is not OF
> hardware that supports it yet). Or is fine to just accept the compatible for now
> and we can do this later when we have the possibility to test with OF-based
> hardware.

That's all defined by the serial device binding already, so it doesn't
really matter here.

You can keep my R-by, but don't send me more ACPI crap.

Rob