linux-kernel - Re: [PATCH] fsi: Use of_property_read

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Message-ID: <CAL_JsqLNg00Z81cpSAOtwVWnfuQMoy2veBcHUHNby1Qh35mLTw@mail.gmail.com>
Date:   Tue, 18 Jul 2023 13:03:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jeremy Kerr <jk@...abs.org>, Joel Stanley <joel@....id.au>,
        Alistar Popple <alistair@...ple.id.au>,
        Eddie James <eajames@...ux.ibm.com>
Cc:     linux-fsi@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fsi: Use of_property_read_reg() to parse "reg"

On Fri, Jun 30, 2023 at 3:02 PM Rob Herring <robh@...nel.org> wrote:
>
> On Fri, Jun 9, 2023 at 12:31 PM Rob Herring <robh@...nel.org> wrote:
> >
> > Use the recently added of_property_read_reg() helper to get the
> > untranslated "reg" address value.
> >
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> >  drivers/fsi/fsi-core.c | 39 +++++++++------------------------------
> >  1 file changed, 9 insertions(+), 30 deletions(-)
>
> Ping!

Is FSI still maintained or should we just remove it?

>
> >
> > diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
> > index 0b927c9f4267..19c4d5b3bde9 100644
> > --- a/drivers/fsi/fsi-core.c
> > +++ b/drivers/fsi/fsi-core.c
> > @@ -16,6 +16,7 @@
> >  #include <linux/idr.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> > +#include <linux/of_address.h>
> >  #include <linux/slab.h>
> >  #include <linux/bitops.h>
> >  #include <linux/cdev.h>
> > @@ -415,28 +416,18 @@ EXPORT_SYMBOL_GPL(fsi_slave_release_range);
> >  static bool fsi_device_node_matches(struct device *dev, struct device_node *np,
> >                 uint32_t addr, uint32_t size)
> >  {
> > -       unsigned int len, na, ns;
> > -       const __be32 *prop;
> > -       uint32_t psize;
> > +       u64 paddr, psize;
> >
> > -       na = of_n_addr_cells(np);
> > -       ns = of_n_size_cells(np);
> > -
> > -       if (na != 1 || ns != 1)
> > -               return false;
> > -
> > -       prop = of_get_property(np, "reg", &len);
> > -       if (!prop || len != 8)
> > +       if (of_property_read_reg(np, 0, &paddr, &psize))
> >                 return false;
> >
> > -       if (of_read_number(prop, 1) != addr)
> > +       if (paddr != addr)
> >                 return false;
> >
> > -       psize = of_read_number(prop + 1, 1);
> >         if (psize != size) {
> >                 dev_warn(dev,
> > -                       "node %s matches probed address, but not size (got 0x%x, expected 0x%x)",
> > -                       of_node_full_name(np), psize, size);
> > +                       "node %pOF matches probed address, but not size (got 0x%llx, expected 0x%x)",
> > +                       np, psize, size);
> >         }
> >
> >         return true;
> > @@ -653,24 +644,12 @@ static void fsi_slave_release(struct device *dev)
> >  static bool fsi_slave_node_matches(struct device_node *np,
> >                 int link, uint8_t id)
> >  {
> > -       unsigned int len, na, ns;
> > -       const __be32 *prop;
> > -
> > -       na = of_n_addr_cells(np);
> > -       ns = of_n_size_cells(np);
> > -
> > -       /* Ensure we have the correct format for addresses and sizes in
> > -        * reg properties
> > -        */
> > -       if (na != 2 || ns != 0)
> > -               return false;
> > +       u64 addr;
> >
> > -       prop = of_get_property(np, "reg", &len);
> > -       if (!prop || len != 8)
> > +       if (of_property_read_reg(np, 0, &addr, NULL))
> >                 return false;
> >
> > -       return (of_read_number(prop, 1) == link) &&
> > -               (of_read_number(prop + 1, 1) == id);
> > +       return addr == (((u64)link << 32) | id);
> >  }
> >
> >  /* Find a matching node for the slave at (link, id). Returns NULL if none
> > --
> > 2.39.2
> >