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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Fri, 5 Feb 2021 20:58:06 +0200
Message-ID: <CAHp75VcVPfgA-WS+gAH6ugrzaU9_nhRcg0pC07x7XcBha55bPg@mail.gmail.com>
Subject: Re: [net-next PATCH v4 07/15] net: mdiobus: Introduce fwnode_mdiobus_register_phy()
To:     Calvin Johnson <calvin.johnson@oss.nxp.com>
Cc:     Grant Likely <grant.likely@arm.com>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Jeremy Linton <jeremy.linton@arm.com>,
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On Fri, Feb 5, 2021 at 8:41 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
> On Fri, Feb 5, 2021 at 8:25 PM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> > On Fri, Feb 5, 2021 at 7:25 PM Calvin Johnson
> > <calvin.johnson@oss.nxp.com> wrote:
> > > On Fri, Jan 22, 2021 at 09:12:52PM +0530, Calvin Johnson wrote:
> >
> > ...
> >
> > > > +     rc = fwnode_property_match_string(child, "compatible", "ethernet-phy-ieee802.3-c45");
> > > With ACPI, I'm facing some problem with fwnode_property_match_string(). It is
> > > unable to detect the compatible string and returns -EPROTO.
> > >
> > > ACPI node for PHY4 is as below:
> > >
> > >  Device(PHY4) {
> > >     Name (_ADR, 0x4)
> > >     Name(_CRS, ResourceTemplate() {
> > >     Interrupt(ResourceConsumer, Level, ActiveHigh, Shared)
> > >     {
> > >       AQR_PHY4_IT
> > >     }
> > >     }) // end of _CRS for PHY4
> > >     Name (_DSD, Package () {
> > >       ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> > >         Package () {
>
> > >           Package () {"compatible", "ethernet-phy-ieee802.3-c45"}
>
> I guess converting this to
>            Package () {"compatible", Package() {"ethernet-phy-ieee802.3-c45"}}
> will solve it.

For the record, it doesn't mean there is no bug in the code. DT treats
a single string as an array, but ACPI doesn't.
And this is specific to _match_string() because it has two passes. And
the first one fails.
While reading a single string as an array of 1 element will work I believe.

> > >        }
>
> > >     })
> > >   } // end of PHY4
> > >
> > >  What is see is that in acpi_data_get_property(),
> > > propvalue->type = 0x2(ACPI_TYPE_STRING) and type = 0x4(ACPI_TYPE_PACKAGE).
> > >
> > > Any help please?
> > >
> > > fwnode_property_match_string() works fine for DT.
> >
> > Can you show the DT node which works and also input for the
> > )match_string() (i.o.w what exactly you are trying to match with)?


-- 
With Best Regards,
Andy Shevchenko