linux-kernel - Re: [net-next PATCH v4 01/15] Documentation: ACPI: DSD: Document MDIO PHY

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Message-ID: <CAHp75Vcq53+Ogret0d=4ThOM9bqF21FFFLDnW0AQzeKmM62gFA@mail.gmail.com>
Date:   Fri, 29 Jan 2021 19:21:07 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     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>, Saravana Kannan <saravanak@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        "linux.cj" <linux.cj@...il.com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [net-next PATCH v4 01/15] Documentation: ACPI: DSD: Document MDIO PHY

On Fri, Jan 29, 2021 at 6:44 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> On Fri, Jan 29, 2021 at 5:37 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> > On Fri, Jan 29, 2021 at 7:48 AM Calvin Johnson
> > <calvin.johnson@....nxp.com> wrote:

...

> > It would work, but I would introduce a wrapper around the _ADR
> > evaluation, something like:
> >
> > int acpi_get_local_address(acpi_handle handle, u32 *addr)
> > {
> >       unsigned long long adr;
> >       acpi_status status;
> >
> >       status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
> >       if (ACPI_FAILURE(status))
> >                 return -ENODATA;
> >
> >       *addr = (u32)adr;
> >       return 0;
> > }
> >
> > in drivers/acpi/utils.c and add a static inline stub always returning
> > -ENODEV for it for !CONFIG_ACPI.

...

> BTW, you may not need the fwnode_get_local_addr() at all then, just
> evaluate either the "reg" property for OF or acpi_get_local_address()
> for ACPI in the "caller" code directly. A common helper doing this can
> be added later.

Sounds good to me and it will address your concern about different
semantics of reg/_ADR on per driver/subsystem basis.

-- 
With Best Regards,
Andy Shevchenko