linux-kernel - Re: [PATCH v4 2/3] i3c: move i3c_device_match

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Date:   Fri, 12 Jul 2019 18:34:36 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     "Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "bbrezillon@...nel.org" <bbrezillon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
        "lorenzo@...nel.org" <lorenzo@...nel.org>
Subject: Re: [PATCH v4 2/3] i3c: move i3c_device_match_id to device.c and
 export it

On Fri, 12 Jul 2019 16:21:49 +0000
Vitor Soares <Vitor.Soares@...opsys.com> wrote:

> > 
> > You're missing a kerneldoc here.  
> 
> I will do that. Can you clarify why we need that?
> 

So the function is properly documented here [1].

> >   
> > > +const struct i3c_device_id *
> > > +i3c_device_match_id(struct i3c_device *i3cdev,
> > > +		    const struct i3c_device_id *id_table)
> > > +{
> > > +	struct i3c_device_info devinfo;
> > > +	const struct i3c_device_id *id;
> > > +
> > > +	i3c_device_get_info(i3cdev, &devinfo);
> > > +
> > > +	/*
> > > +	 * The lower 32bits of the provisional ID is just filled with a random
> > > +	 * value, try to match using DCR info.
> > > +	 */
> > > +	if (!I3C_PID_RND_LOWER_32BITS(devinfo.pid)) {
> > > +		u16 manuf = I3C_PID_MANUF_ID(devinfo.pid);
> > > +		u16 part = I3C_PID_PART_ID(devinfo.pid);
> > > +		u16 ext_info = I3C_PID_EXTRA_INFO(devinfo.pid);
> > > +
> > > +		/* First try to match by manufacturer/part ID. */
> > > +		for (id = id_table; id->match_flags != 0; id++) {
> > > +			if ((id->match_flags & I3C_MATCH_MANUF_AND_PART) !=
> > > +			    I3C_MATCH_MANUF_AND_PART)
> > > +				continue;
> > > +
> > > +			if (manuf != id->manuf_id || part != id->part_id)
> > > +				continue;
> > > +
> > > +			if ((id->match_flags & I3C_MATCH_EXTRA_INFO) &&
> > > +			    ext_info != id->extra_info)
> > > +				continue;
> > > +
> > > +			return id;
> > > +		}
> > > +	}
> > > +
> > > +	/* Fallback to DCR match. */
> > > +	for (id = id_table; id->match_flags != 0; id++) {
> > > +		if ((id->match_flags & I3C_MATCH_DCR) &&
> > > +		    id->dcr == devinfo.dcr)
> > > +			return id;
> > > +	}
> > > +
> > > +	return NULL;
> > > +}
> > > +EXPORT_SYMBOL_GPL(i3c_device_match_id);
> > > +


[1]https://www.kernel.org/doc/html/latest/driver-api/i3c/device-driver-api.html