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

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Message-ID: <CAL_JsqLTc_9Yujp=wJjjn7P5YwAFZ9fn2SU6ey1q_gY3MFp9TA@mail.gmail.com>
Date:   Fri, 30 Jun 2023 15:02:52 -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 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!

>
> 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
>