linux-kernel - Re: [PATCH 02/18] property: Add support for calling fwnode_graph_get_endpoint_by

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Date:   Mon, 30 Nov 2020 20:41:41 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-media@...r.kernel.org,
        devel@...ica.org, rjw@...ysocki.net, lenb@...nel.org,
        gregkh@...uxfoundation.org, mika.westerberg@...ux.intel.com,
        linus.walleij@...aro.org, bgolaszewski@...libre.com,
        wsa@...nel.org, yong.zhi@...el.com, sakari.ailus@...ux.intel.com,
        bingbu.cao@...el.com, tian.shu.qiu@...el.com, mchehab@...nel.org,
        robert.moore@...el.com, erik.kaneda@...el.com, pmladek@...e.com,
        rostedt@...dmis.org, sergey.senozhatsky@...il.com,
        linux@...musvillemoes.dk, kieran.bingham+renesas@...asonboard.com,
        jacopo+renesas@...ndi.org,
        laurent.pinchart+renesas@...asonboard.com,
        jorhand@...ux.microsoft.com, kitakar@...il.com,
        heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH 02/18] property: Add support for calling
 fwnode_graph_get_endpoint_by_id() for fwnode->secondary

Hi Andy,

On Mon, Nov 30, 2020 at 07:53:19PM +0200, Andy Shevchenko wrote:
> On Mon, Nov 30, 2020 at 07:28:57PM +0200, Laurent Pinchart wrote:
> > On Mon, Nov 30, 2020 at 07:29:00PM +0200, Andy Shevchenko wrote:
> > > On Mon, Nov 30, 2020 at 01:31:13PM +0000, Daniel Scally wrote:
> 
> ...
> 
> > > > +	if (!best_ep && fwnode && !IS_ERR_OR_NULL(fwnode->secondary))
> > > > +		return fwnode_graph_get_endpoint_by_id(fwnode->secondary, port,
> > > > +						       endpoint, flags);
> > > 
> > > >  	return best_ep;
> > > 
> > > Can we, please, do
> > > 
> > > 	if (best_ep)
> > > 		return best_ep;
> > > 
> > > 	if (fwnode && !IS_ERR_OR_NULL(fwnode->secondary))
> > > 		return fwnode_graph_get_endpoint_by_id(fwnode->secondary, port,
> > > 						       endpoint, flags);
> > > 
> > > 	return NULL;
> > > 
> > > ?
> > > 
> > > This 'if (fwnode && !IS_ERR_OR_NULL(fwnode->secondary))' becomes kinda
> > > idiomatic to the cases when we need to proceed primary followed by the
> > > secondary in cases where it's not already done.
> > 
> > We could also move the !fwnode check to the beginning of the function.
> 
> It's already there (1). What did I miss?

It is, but as we need an explicitly check at the end, it feels cleaner
to move it to the beginning. No big deal though.

> 1) via fwnode_graph_get_next_endpoint() -> fwnode_call_ptr_op()

-- 
Regards,

Laurent Pinchart