linux-kernel - Re: [PATCH v2] of: property: fw_devlink: do not link ".*,nr-gpios"

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Date:   Fri, 9 Apr 2021 12:36:36 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2] of: property: fw_devlink: do not link ".*,nr-gpios"

On Fri, Apr 9, 2021 at 12:26 PM Rob Herring <robh@...nel.org> wrote:
>
> On Wed, Apr 7, 2021 at 3:45 PM Ilya Lipnitskiy
> <ilya.lipnitskiy@...il.com> wrote:
> >
> > On Tue, Apr 6, 2021 at 6:24 PM Saravana Kannan <saravanak@...gle.com> wrote:
> > >
> > > On Tue, Apr 6, 2021 at 6:10 PM Rob Herring <robh@...nel.org> wrote:
> > > >
> > > > On Tue, Apr 6, 2021 at 7:46 PM Saravana Kannan <saravanak@...gle.com> wrote:
> > > > >
> > > > > On Tue, Apr 6, 2021 at 5:34 PM Rob Herring <robh@...nel.org> wrote:
> > > > > >
> > > > > > On Tue, Apr 06, 2021 at 04:09:10PM -0700, Saravana Kannan wrote:
> > > > > > > On Mon, Apr 5, 2021 at 3:26 PM Ilya Lipnitskiy
> > > > > > > <ilya.lipnitskiy@...il.com> wrote:
> > > > > > > >
> > > > > > > > [<vendor>,]nr-gpios property is used by some GPIO drivers[0] to indicate
> > > > > > > > the number of GPIOs present on a system, not define a GPIO. nr-gpios is
> > > > > > > > not configured by #gpio-cells and can't be parsed along with other
> > > > > > > > "*-gpios" properties.
> > > > > > > >
> > > > > > > > nr-gpios without the "<vendor>," prefix is not allowed by the DT
> > > > > > > > spec[1], so only add exception for the ",nr-gpios" suffix and let the
> > > > > > > > error message continue being printed for non-compliant implementations.
> > > > > > > >
> > > > > > > > [0]: nr-gpios is referenced in Documentation/devicetree/bindings/gpio:
> > > > > > > >  - gpio-adnp.txt
> > > > > > > >  - gpio-xgene-sb.txt
> > > > > > > >  - gpio-xlp.txt
> > > > > > > >  - snps,dw-apb-gpio.yaml
> > > > > > > >
> > > > > > > > [1]:
> > > > > > > > Link: https://github.com/devicetree-org/dt-schema/blob/cb53a16a1eb3e2169ce170c071e47940845ec26e/schemas/gpio/gpio-consumer.yaml#L20
> > > > > > > >
> > > > > > > > Fixes errors such as:
> > > > > > > >   OF: /palmbus@...000/gpio@600: could not find phandle
> > > > > > > >
> > > > > > > > Fixes: 7f00be96f125 ("of: property: Add device link support for interrupt-parent, dmas and -gpio(s)")
> > > > > > > > Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
> > > > > > > > Cc: Saravana Kannan <saravanak@...gle.com>
> > > > > > > > Cc: <stable@...r.kernel.org> # 5.5.x
> > > > > > > > ---
> > > > > > > >  drivers/of/property.c | 11 ++++++++++-
> > > > > > > >  1 file changed, 10 insertions(+), 1 deletion(-)
> > > > > > > >
> > > > > > > > diff --git a/drivers/of/property.c b/drivers/of/property.c
> > > > > > > > index 2046ae311322..1793303e84ac 100644
> > > > > > > > --- a/drivers/of/property.c
> > > > > > > > +++ b/drivers/of/property.c
> > > > > > > > @@ -1281,7 +1281,16 @@ DEFINE_SIMPLE_PROP(pinctrl7, "pinctrl-7", NULL)
> > > > > > > >  DEFINE_SIMPLE_PROP(pinctrl8, "pinctrl-8", NULL)
> > > > > > > >  DEFINE_SUFFIX_PROP(regulators, "-supply", NULL)
> > > > > > > >  DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells")
> > > > > > > > -DEFINE_SUFFIX_PROP(gpios, "-gpios", "#gpio-cells")
> > > > > > > > +
> > > > > > > > +static struct device_node *parse_gpios(struct device_node *np,
> > > > > > > > +                                      const char *prop_name, int index)
> > > > > > > > +{
> > > > > > > > +       if (!strcmp_suffix(prop_name, ",nr-gpios"))
> > > > > > > > +               return NULL;
> > > > > > >
> > > > > > > Ah I somehow missed this patch. This gives a blanked exception for
> > > > > > > vendor,nr-gpios. I'd prefer explicit exceptions for all the instances
> > > > > > > of ",nr-gpios" we are grandfathering in. Any future additions should
> > > > > > > be rejected. Can we do that please?
> > > > > > >
> > > > > > > Rob, you okay with making this list more explicit?
> > > > > >
> > > > > > Not the kernel's job IMO. A schema is the right way to handle that.
> > > > >
> > > > > Ok, that's fine by me. Btw, let's land this in driver-core? I've made
> > > > > changes there and this might cause conflicts. Not sure.
> > > >
> > > > It merges with linux-next fine. You'll need to resend this to Greg if
> > > > you want to do that.
> > > >
> > > > Reviewed-by: Rob Herring <robh@...nel.org>
> > >
> > > Hi Greg,
> > >
> > > Can you pull this into driver-core please?
> > Do you want me to re-spin on top of driver-core? The patch is
> > currently based on dt/next in robh/linux.git
>
> I did say you need to resend the patch to Greg, but since there's no
> movement on this and I have other things to send upstream, I've
> applied it.

:'(

If it's not too late, can we please drop it? I'm sure Greg would be
okay with picking this up.

-Saravana