linux-kernel - Re: [PATCH v2 3/3] hwmon: (occ) Check for device property for setting OCC active during probe

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Date:   Tue, 27 Sep 2022 07:35:49 +0000
From:   Joel Stanley <joel@....id.au>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Eddie James <eajames@...ux.ibm.com>, jdelvare@...e.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsi@...ts.ozlabs.org
Subject: Re: [PATCH v2 3/3] hwmon: (occ) Check for device property for setting
 OCC active during probe

On Sun, 25 Sept 2022 at 18:06, Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Tue, Aug 09, 2022 at 03:07:01PM -0500, Eddie James wrote:
> > A previous commit changed the existing behavior of the driver to skip
> > attempting to communicate with the OCC during probe. Return to the
> > previous default behavior of automatically communicating with the OCC
> > and make it optional with a new device-tree property.
> >
> > Signed-off-by: Eddie James <eajames@...ux.ibm.com>
>
> Assuming this patch is applied as part of the series outside
> the hwmon subsystem.
>
> Acked-by: Guenter Roeck <linux@...ck-us.net>

Thanks Guenter. I have applied it to the FSI tree.


>
> Guenter
>
> > ---
> >  drivers/hwmon/occ/common.c | 11 ++++++++++-
> >  drivers/hwmon/occ/p9_sbe.c |  9 +++++++++
> >  2 files changed, 19 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
> > index 45407b12db4b..dd690f700d49 100644
> > --- a/drivers/hwmon/occ/common.c
> > +++ b/drivers/hwmon/occ/common.c
> > @@ -10,6 +10,7 @@
> >  #include <linux/math64.h>
> >  #include <linux/module.h>
> >  #include <linux/mutex.h>
> > +#include <linux/property.h>
> >  #include <linux/sysfs.h>
> >  #include <asm/unaligned.h>
> >
> > @@ -1216,8 +1217,16 @@ int occ_setup(struct occ *occ)
> >       occ->groups[0] = &occ->group;
> >
> >       rc = occ_setup_sysfs(occ);
> > -     if (rc)
> > +     if (rc) {
> >               dev_err(occ->bus_dev, "failed to setup sysfs: %d\n", rc);
> > +             return rc;
> > +     }
> > +
> > +     if (!device_property_read_bool(occ->bus_dev, "ibm,no-poll-on-init")) {
> > +             rc = occ_active(occ, true);
> > +             if (rc)
> > +                     occ_shutdown_sysfs(occ);
> > +     }
> >
> >       return rc;
> >  }
> > diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
> > index 4a1fe4ee8e2c..3adcf8d0b4a6 100644
> > --- a/drivers/hwmon/occ/p9_sbe.c
> > +++ b/drivers/hwmon/occ/p9_sbe.c
> > @@ -7,6 +7,7 @@
> >  #include <linux/fsi-occ.h>
> >  #include <linux/mm.h>
> >  #include <linux/module.h>
> > +#include <linux/mod_devicetable.h>
> >  #include <linux/mutex.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/string.h>
> > @@ -179,9 +180,17 @@ static int p9_sbe_occ_remove(struct platform_device *pdev)
> >       return 0;
> >  }
> >
> > +static const struct of_device_id p9_sbe_occ_of_match[] = {
> > +     { .compatible = "ibm,p9-occ-hwmon" },
> > +     { .compatible = "ibm,p10-occ-hwmon" },
> > +     {}
> > +};
> > +MODULE_DEVICE_TABLE(of, p9_sbe_occ_of_match);
> > +
> >  static struct platform_driver p9_sbe_occ_driver = {
> >       .driver = {
> >               .name = "occ-hwmon",
> > +             .of_match_table = p9_sbe_occ_of_match,
> >       },
> >       .probe  = p9_sbe_occ_probe,
> >       .remove = p9_sbe_occ_remove,