linux-kernel - Re: [net-next PATCH v2 10/14] device property: Introduce fwnode_get

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Date:   Tue, 15 Dec 2020 19:45:16 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Calvin Johnson <calvin.johnson@....nxp.com>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>, "linux.cj" <linux.cj@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        netdev <netdev@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [net-next PATCH v2 10/14] device property: Introduce fwnode_get_id()

On Tue, Dec 15, 2020 at 6:44 PM Calvin Johnson
<calvin.johnson@....nxp.com> wrote:
>
> Using fwnode_get_id(), get the reg property value for DT node
> and get the _ADR object value for ACPI node.

and -> or

...

> +/**
> + * fwnode_get_id - Get the id of a fwnode.
> + * @fwnode: firmware node
> + * @id: id of the fwnode
> + *
> + * Returns 0 on success or a negative errno.
> + */
> +int fwnode_get_id(struct fwnode_handle *fwnode, u32 *id)
> +{
> +       unsigned long long adr;
> +       acpi_status status;
> +
> +       if (is_of_node(fwnode)) {
> +               return of_property_read_u32(to_of_node(fwnode), "reg", id);

ACPI nodes can hold reg property as well. I would rather think about

ret = fwnode_property_read_u32(fwnode, "reg", id)
if (!(ret && is_acpi_node(fwnode)))
  return ret;

> +       } else if (is_acpi_node(fwnode)) {

Redundant 'else'

> +               status = acpi_evaluate_integer(ACPI_HANDLE_FWNODE(fwnode),
> +                                              METHOD_NAME__ADR, NULL, &adr);
> +               if (ACPI_FAILURE(status))
> +                       return -ENODATA;

I'm wondering if it compiles when CONFIG_ACPI=n.

> +               *id = (u32)adr;
> +               return 0;
> +       }

> +       return -EINVAL;
> +}

-- 
With Best Regards,
Andy Shevchenko