linux-kernel - Re: [net-next PATCH v2 10/14] device property: Introduce fwnode_get

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Date:   Fri, 18 Dec 2020 11:42:29 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        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>, "linux.cj" <linux.cj@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        netdev <netdev@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        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 v2 10/14] device property: Introduce
 fwnode_get_id()

On Tue, Dec 15, 2020 at 07:45:16PM +0200, Andy Shevchenko wrote:
> On Tue, Dec 15, 2020 at 6:44 PM Calvin Johnson
> <calvin.johnson@....nxp.com> wrote:
> >
> > Using fwnode_get_id(), get the reg property value for DT node
> > and get the _ADR object value for ACPI node.
> 
> and -> or
> 
> ...
> 
> > +/**
> > + * fwnode_get_id - Get the id of a fwnode.
> > + * @fwnode: firmware node
> > + * @id: id of the fwnode
> > + *
> > + * Returns 0 on success or a negative errno.
> > + */
> > +int fwnode_get_id(struct fwnode_handle *fwnode, u32 *id)
> > +{
> > +       unsigned long long adr;
> > +       acpi_status status;
> > +
> > +       if (is_of_node(fwnode)) {
> > +               return of_property_read_u32(to_of_node(fwnode), "reg", id);
> 
> ACPI nodes can hold reg property as well. I would rather think about
> 
> ret = fwnode_property_read_u32(fwnode, "reg", id)
> if (!(ret && is_acpi_node(fwnode)))
>   return ret;
> 
Got it. Will rework on it.
> > +       } else if (is_acpi_node(fwnode)) {
> 
> Redundant 'else'
> 
> > +               status = acpi_evaluate_integer(ACPI_HANDLE_FWNODE(fwnode),
> > +                                              METHOD_NAME__ADR, NULL, &adr);
> > +               if (ACPI_FAILURE(status))
> > +                       return -ENODATA;
> 
> I'm wondering if it compiles when CONFIG_ACPI=n.
Correct. It doesn't compile for non-ACPI case. Will resolve it.

Thanks
Calvin