Re: [PATCH 2/4] firmware: arm_scmi: bus: Bypass setting fwnode for pinctrl

[Cristian Marussi <cristian.marussi@arm.com>]

On Tue, Jan 14, 2025 at 08:31:03AM +0000, Peng Fan wrote:
> Hi Cristian, Sudeep
> 
> > Subject: Re: [PATCH 2/4] firmware: arm_scmi: bus: Bypass setting
> > fwnode for pinctrl
> > 
> [...]
> 
> > >> fix here) than this change.
> > >
> > >...or indeed this is another possibility
> > 
> > I am doing a patch as below, how to do you think?
> 
> Do you have any comments on below ideas?
> 
> I am thinking to send out new patchset based on
> below ideas in this week.
> 

Hi Peng,

sorry for the delay.

Why both blacklist and allowlist ?

Cristian

> > 
> > With below patch, we could resolve the devlink issue and also support
> > mutitple vendor drivers built in, with each vendor driver has a
> > machine_allowlist.
> > 
> > diff --git a/drivers/firmware/arm_scmi/bus.c
> > b/drivers/firmware/arm_scmi/bus.c index
> > 1d2aedfcfdb4..c1c45b545480 100644
> > --- a/drivers/firmware/arm_scmi/bus.c
> > +++ b/drivers/firmware/arm_scmi/bus.c
> > @@ -55,6 +55,20 @@ static int scmi_protocol_device_request(const
> > struct scmi_device_id *id_table)
> >         unsigned int id = 0;
> >         struct list_head *head, *phead = NULL;
> >         struct scmi_requested_dev *rdev;
> > +       const char * const *allowlist = id_table->machine_allowlist;
> > +       const char * const *blocklist = id_table->machine_blocklist;
> > +
> > +       if (blocklist && of_machine_compatible_match(blocklist)) {
> > +               pr_debug("block SCMI device (%s) for protocol %x\n",
> > +                        id_table->name, id_table->protocol_id);
> > +               return 0;
> > +       }
> > +
> > +       if (allowlist && !of_machine_compatible_match(allowlist)) {
> > +               pr_debug("block SCMI device (%s) for protocol %x\n",
> > +                        id_table->name, id_table->protocol_id);
> > +               return 0;
> > +       }
> > 
> >         pr_debug("Requesting SCMI device (%s) for protocol %x\n",
> >                  id_table->name, id_table->protocol_id); diff --git
> > a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h index
> > 688466a0e816..e1b822d3522f 100644
> > --- a/include/linux/scmi_protocol.h
> > +++ b/include/linux/scmi_protocol.h
> > @@ -950,6 +950,9 @@ struct scmi_device {  struct scmi_device_id {
> >         u8 protocol_id;
> >         const char *name;
> > +       /* Optional */
> > +       const char * const *machine_blocklist;
> > +       const char * const *machine_allowlist;
> >  };
> 
> Thanks,
> Peng.
> 
> > 
> >  struct scmi_driver {
> > 
> > Thanks,
> > Peng
> > >
> > >Thanks,
> > >Cristian