linux-kernel - Re: [PATCH 1/7] dt-bindings: Add DT bindings documentation for Allwinner Thermal Sensor Controller

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Message-ID: <20180824145840.isdcg3fr6mw4ntzg@flea>
Date:   Fri, 24 Aug 2018 16:58:40 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Emmanuel Vadot <manu@...ouilliste.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Eduardo Valentin <edubezval@...il.com>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Emmanuel Vadot <manu@...ebsd.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Zhang Rui <rui.zhang@...el.com>, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/7] dt-bindings: Add DT bindings documentation for
 Allwinner Thermal Sensor Controller

Hi,

On Mon, Aug 20, 2018 at 04:27:15PM +0200, Emmanuel Vadot wrote:
> On Mon, 20 Aug 2018 16:07:37 +0200
> Maxime Ripard <maxime.ripard@...tlin.com> wrote:
> 
> > On Mon, Aug 20, 2018 at 07:41:22AM -0600, Rob Herring wrote:
> > > On Mon, Aug 20, 2018 at 5:17 AM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
> > > >
> > > > On Sat, Aug 04, 2018 at 09:03:49AM +0200, Emmanuel Vadot wrote:
> > > > > This patch adds documentation for Device-Tree bindings for the Allwinner
> > > > > Thermal Sensor Controller found on the H3, H5 and A64 SoCs
> > > > >
> > > > > Signed-off-by: Emmanuel Vadot <manu@...ebsd.org>
> > > >
> > > > I'm not going to merge a binding for a device that doesn't have any
> > > > driver implemented at the moment in Linux.
> > > 
> > > I'll take it then. Linux is not the only DT client.
> > 
> > Then don't complain if we ever have to break the ABI. We never tested
> > that hardware, never had any code running on it, and it *will* cause
> > some issues. For example, the calibration data have never been used
> > and how they should be represented have never been described, since no
> > one ever actually tried to use it.
> > 
> > And sure, Linux is not the only DT client. Just like FreeBSD isn't.
> 
>  What kind of data would you need for me to make things better ?
>  We have the driver in FreeBSD for almost two years now, whne I started
> to see how to upstream it I noticed a lot of problems and spent 4 or 5
> days to try on all the SoCs mentionned in the serie, the only SoC I
> didn't include it the A83T as for some reason I couldn't make the
> driver work.

Do you have a link to that driver? How and how much did you test it?

Are you using the calibration data stored in the SID?

> I just hope that you understand that we cannot wait for Linux to
> have a driver to have some bindings.

Just like I'm sure you can understand that just merging the DT bits
without testing anything caused some troubles in the past, and I don't
want to discover it in a year from now.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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