linux-kernel - Re: [PATCH 11/15] x86, olpc: Use a correct version when making up a battery node

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Date:   Wed, 14 Nov 2018 17:49:34 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        quozl@...top.org, Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Eric Miao <eric.y.miao@...il.com>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Daniel Mack <daniel@...que.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        linux-spi <linux-spi@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        devel@...verdev.osuosl.org, Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 11/15] x86, olpc: Use a correct version when making up a
 battery node

Hello,

On Fri, 2018-10-19 at 16:43 +0300, Andy Shevchenko wrote:
> On Wed, Oct 10, 2018 at 8:23 PM Lubomir Rintel <lkundrak@...sk>
> wrote:
> > The XO-1 and XO-1.5 batteries apparently differ in an ability to
> > report
> > ambient temperature. Add a different compatible string to the 1.5
> > battery.
> > +int olpc_dt_compatible_match(phandle node, const char *compat)
> >  {
> >         char buf[64];
> > +       int plen;
> > +       char *p;
> > +       int len;
> > +
> > +       plen = olpc_dt_getproperty(node, "compatible", buf,
> > sizeof(buf));
> > +       if (plen <= 0)
> > +               return 0;
> > +
> > +       len = strlen(compat);
> > +       for (p = buf; p < buf + plen; p += strlen(p) + 1) {
> > +               if (strcmp(p, compat) == 0)
> > +                       return 1;
> > +       }
> > +
> > +       return 0;
> > +}
> 
> DT doesn't still have a helper for that?!
> I hardly believe in that.

There indeed is of_device_compatible_match() (and
of_find_node_by_phandle() for that matter).

However, these fixups are executed before the DT is built with
of_pdt_build_devicetree(), so I don't think any of_*() routines can be
used at that point.

> > +               olpc_dt_interpret("\" /battery@0\" find-device"
> > +                       " \" olpc,xo1.5-battery\" +compatible"
> > +                       " device-end");
> 
> Please, don't split string literals.
> 
> >                 olpc_dt_interpret("\" /pci/display@1\" find-device"
> >                         " new-device"
> >                         " \" dcon\" device-name \" olpc,xo1-dcon\"
> > +compatible"
> >                         " finish-device device-end");
> 
> Yeah, this and similar also needs to be fixed.

Okay.

Thank you
Lubo