RE: [PATCH 4/5] staging: fsl-mc: bus rescan attribute to sync kernel with MC

[Lijun Pan <Lijun.Pan@freescale.com>]

> -----Original Message-----
> From: Greg KH [mailto:gregkh@linuxfoundation.org]
> Sent: Tuesday, October 27, 2015 12:40 AM
> To: Pan Lijun-B44306 <Lijun.Pan@freescale.com>
> Cc: arnd@arndb.de; devel@driverdev.osuosl.org; linux-
> kernel@vger.kernel.org; Hamciuc Bogdan-BHAMCIU1
> <bhamciu1@freescale.com>; Sharma Bhupesh-B45370
> <bhupesh.sharma@freescale.com>; Rivera Jose-B46482
> <German.Rivera@freescale.com>; agraf@suse.de; Yoder Stuart-B08248
> <stuart.yoder@freescale.com>; Erez Nir-RM30794 <nir.erez@freescale.com>;
> katz Itai-RM05202 <itai.katz@freescale.com>; Wood Scott-B07421
> <scottwood@freescale.com>; Li Yang-Leo-R58472 <LeoLi@freescale.com>;
> Marginean Alexandru-R89243 <R89243@freescale.com>;
> dan.carpenter@oracle.com; Schmitt Richard-B43082
> <richard.schmitt@freescale.com>
> Subject: Re: [PATCH 4/5] staging: fsl-mc: bus rescan attribute to sync kernel
> with MC
> 
> On Sun, Oct 25, 2015 at 05:41:22PM -0500, Lijun Pan wrote:
> > Introduce the rescan attribute as a bus attribute to synchronize the
> > fsl-mc bus objects and the MC firmware.
> >
> > To rescan the fsl-mc bus, e.g.,
> > echo 1 > /sys/bus/fsl-mc/rescan
> >
> > Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
> > ---
> >  drivers/staging/fsl-mc/bus/mc-bus.c | 46
> > +++++++++++++++++++++++++++++++++++++
> >  1 file changed, 46 insertions(+)
> >
> > diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c
> > b/drivers/staging/fsl-mc/bus/mc-bus.c
> > index 33a56ad..f1baad7 100644
> > --- a/drivers/staging/fsl-mc/bus/mc-bus.c
> > +++ b/drivers/staging/fsl-mc/bus/mc-bus.c
> > @@ -144,11 +144,57 @@ static const struct attribute_group
> *fsl_mc_dev_groups[] = {
> >  	NULL,
> >  };
> >
> > +static int scan_fsl_mc_bus(struct device *dev, void *data) {
> > +	struct fsl_mc_device *root_mc_dev;
> > +	struct fsl_mc_bus *root_mc_bus;
> > +
> > +	if (is_root_dprc(dev)) {
> > +		root_mc_dev = to_fsl_mc_device(dev);
> > +		root_mc_bus = to_fsl_mc_bus(root_mc_dev);
> > +		mutex_lock(&root_mc_bus->scan_mutex);
> > +		dprc_scan_objects(root_mc_dev);
> > +		mutex_unlock(&root_mc_bus->scan_mutex);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static ssize_t bus_rescan_store(struct bus_type *bus,
> > +			    const char *buf, size_t count) {
> > +	unsigned long val;
> > +
> > +	if (kstrtoul(buf, 0, &val) < 0)
> > +		return -EINVAL;
> > +
> > +	if (val)
> > +		bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
> > +
> > +	return count;
> > +}
> > +static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
> > +
> > +static struct attribute *fsl_mc_bus_attrs[] = {
> > +	&bus_attr_rescan.attr,
> > +	NULL,
> > +};
> > +
> > +static const struct attribute_group fsl_mc_bus_group = {
> > +	.attrs = fsl_mc_bus_attrs,
> > +};
> > +
> > +static const struct attribute_group *fsl_mc_bus_groups[] = {
> > +	&fsl_mc_bus_group,
> > +	NULL,
> > +};
> > +
> >  struct bus_type fsl_mc_bus_type = {
> >  	.name = "fsl-mc",
> >  	.match = fsl_mc_bus_match,
> >  	.uevent = fsl_mc_bus_uevent,
> >  	.dev_groups = fsl_mc_dev_groups,
> > +	.bus_groups = fsl_mc_bus_groups,
> >  };
> >  EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
> 
> No documentation update as well?

Hi Greg,

Are you saying something like adding
Documentation/ABI/testing/sysfs-bus-fsl-mc? For the fsl-mc bus
Documentation/ABI/testing/sysfs-devices-dprc? For the dprc device?
Or 
drivers/staging/fsl-mc/[README.txt | TODO]?

Thanks
Lijun