linux-kernel - Re: [net-next PATCH v3 09/15] device property: Introduce fwnode_get

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Message-ID: <CAJZ5v0ga5RqwFzbBqSChJ7=gBBM-7dWNQPz6bqvqsNAkWZJ=vQ@mail.gmail.com>
Date:   Wed, 20 Jan 2021 20:15:30 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Calvin Johnson <calvin.johnson@....nxp.com>,
        Grant Likely <grant.likely@....com>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "linux.cj" <linux.cj@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [net-next PATCH v3 09/15] device property: Introduce fwnode_get_id()

On Wed, Jan 20, 2021 at 7:51 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Wed, Jan 20, 2021 at 8:18 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> > On Tue, Jan 12, 2021 at 7:02 PM Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:
> > > On Tue, Jan 12, 2021 at 09:30:31AM -0800, Saravana Kannan wrote:
> > > > On Tue, Jan 12, 2021 at 5:42 AM Calvin Johnson
> > > > <calvin.johnson@....nxp.com> wrote:
>
> ...
>
> > > > > +       ret = fwnode_property_read_u32(fwnode, "reg", id);
> > > > > +       if (!(ret && is_acpi_node(fwnode)))
> > > > > +               return ret;
> > > > > +
> > > > > +#ifdef CONFIG_ACPI
> > > > > +       status = acpi_evaluate_integer(ACPI_HANDLE_FWNODE(fwnode),
> > > > > +                                      METHOD_NAME__ADR, NULL, &adr);
> > > > > +       if (ACPI_FAILURE(status))
> > > > > +               return -EINVAL;
> > > > > +       *id = (u32)adr;
> > > > > +#endif
> > > > > +       return 0;
>
> > > > Also ACPI and DT
> > > > aren't mutually exclusive if I'm not mistaken.
> > >
> > > That's why we try 'reg' property for both cases first.
> > >
> > > is_acpi_fwnode() conditional is that what I don't like though.
> >
> > I'm not sure what you mean here, care to elaborate?
>
> I meant is_acpi_node(fwnode) in the conditional.
>
> I think it's redundant and we can simple do something like this:
>
>   if (ret) {
> #ifdef ACPI
>     ...
> #else
>     return ret;
> #endif
>   }
>   return 0;
>
> --

Right, that should work.  And I'd prefer it too.