linux-kernel - Re: [PATCH v3 06/14] include: fwnode.h: Define format macros for ports and endpoints

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Date:   Thu, 24 Dec 2020 14:41:44 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devel@...ica.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yong Zhi <yong.zhi@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tian Shu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        kieran.bingham+renesas@...asonboard.com,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Marco Felsch <m.felsch@...gutronix.de>,
        niklas.soderlund+renesas@...natech.se,
        Steve Longerbeam <slongerbeam@...il.com>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v3 06/14] include: fwnode.h: Define format macros for
 ports and endpoints

Hi Daniel,

Thank you for the patch.

On Thu, Dec 24, 2020 at 02:17:07PM +0200, Andy Shevchenko wrote:
> On Thu, Dec 24, 2020 at 3:12 AM Daniel Scally wrote:
> >
> > OF, ACPI and software_nodes all implement graphs including nodes for ports
> > and endpoints. These are all intended to be named with a common schema,
> > as "port@n" and "endpoint@n" where n is an unsigned int representing the
> > index of the node. To ensure commonality across the subsystems, provide a
> > set of macros to define the format.
> 
> Nitpicks below, but in general that's what I meant, thanks!
> 
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> (after addressing nitpicks)
> 
> > Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Signed-off-by: Daniel Scally <djrscally@...il.com>
> > ---
> > Changes in v3
> >         - Patch introduced
> >
> >  include/linux/fwnode.h | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
> > index 9506f8ec0974..52889efceb7d 100644
> > --- a/include/linux/fwnode.h
> > +++ b/include/linux/fwnode.h
> > @@ -32,6 +32,19 @@ struct fwnode_endpoint {
> >         const struct fwnode_handle *local_fwnode;
> >  };
> >
> > +/*
> > + * ports and endpoints defined in OF, ACPI and as software_nodes should all
> > + * follow a common naming scheme; use these macros to ensure commonality across
> > + * the subsystems.
> > + *
> > + * The *PREFIX_LEN macros refer to the length of the "port@" and "endpoint@"
> 
> *PREFIX_LEN -> *_PREFIX_LEN
> 
> > + * sections of the naming scheme.
> > + */
> > +#define FWNODE_GRAPH_PORT_NAME_FORMAT          "port@%u"
> > +#define FWNODE_GRAPH_PORT_NAME_PREFIX_LEN      5
> > +#define FWNODE_GRAPH_ENDPOINT_NAME_FORMAT      "endpoint@%u"
> > +#define FWNODE_GRAPH_ENDPOINT_PREFIX_LEN       9
> 
> _FORMAT -> _FMT (however, V4L2 guys may correct me, because IIRC _FMT
> suffix is also used for other things in v4l2.

This isn't related to V4L2, so it doesn't matter much :-) I personally
prefer spelling names out in full when that wouldn't result in too long
lines, but it's really a matter of personal preference, I don't mind
either way.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> >  #define NR_FWNODE_REFERENCE_ARGS       8
> >
> >  /**

-- 
Regards,

Laurent Pinchart