linux-kernel - Re: [PATCH v8 05/10] dt-bindings: i3c: Add macros to help fill I3C/I2C device's reg property

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Message-ID: <CAMuHMdVA7eKD+qfzzCqrXus69NPb3Qd_G0k=TYvrdt=2pRG51A@mail.gmail.com>
Date:   Wed, 3 Oct 2018 20:45:02 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        Alicja Jurasik-Urbaniak <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vitor Soares <Vitor.Soares@...opsys.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>, pgaj@...ence.com,
        Peter Rosin <peda@...ntia.se>, mshettel@...eaurora.org,
        swboyd@...omium.org
Subject: Re: [PATCH v8 05/10] dt-bindings: i3c: Add macros to help fill
 I3C/I2C device's reg property

Hi Joe,

On Wed, Oct 3, 2018 at 8:37 PM Joe Perches <joe@...ches.com> wrote:
> On Wed, 2018-10-03 at 15:22 +0200, Boris Brezillon wrote:
> > The reg property of devices connected to an I3C bus have 3 cells, and
> > filling them manually is not trivial. Provides macros to help doing
> > that.
>
> This patch logic seems excessively fragile.

> > --- /dev/null
> > +++ b/include/dt-bindings/i3c/i3c.h

> > +
> > +#define I3C_PID(manufid, partid, instid, extrainfo)          \
> > +     ((manufid) << 1)                                        \
> > +     (((partid) << 16) | ((instid) << 12) | (extrainfo))
>
> This macro doesn't make any sense.  Missing a shift and an or?

No, it generates two of the three cells.

> > +
> > +#define I3C_DEV_WITH_STATIC_ADDR(addr, manufid, partid,              \
> > +                              instid, extrainfo)             \
> > +     (addr) I3C_PID(manufid, partid, instid, extrainfo)
> > +
> > +#define I3C_DEV(manufid, partid, instid, extrainfo)          \
> > +     I3C_DEV_WITH_STATIC_ADDR(0x0, manufid, partid,          \
> > +                              instid, extrainfo)

And the above two macros generate all three cells.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds