linux-kernel - Re: [PATCH net-next v8 10/15] ACPI: utils: Introduce acpi_get_local

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Message-ID: <CAJZ5v0ivYQhhLeO_fcTOexgsUtRJ7dbzr0N99vMZBv-m8CkU1g@mail.gmail.com>
Date:   Thu, 10 Jun 2021 20:09:14 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ioana Ciornei <ciorneiioana@...il.com>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        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>, Saravana Kannan <saravanak@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>, calvin.johnson@....com,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Madalin Bucur <madalin.bucur@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        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.cj" <linux.cj@...il.com>, netdev <netdev@...r.kernel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Calvin Johnson <calvin.johnson@....nxp.com>,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: Re: [PATCH net-next v8 10/15] ACPI: utils: Introduce acpi_get_local_address()

On Thu, Jun 10, 2021 at 6:40 PM Ioana Ciornei <ciorneiioana@...il.com> wrote:
>
> From: Calvin Johnson <calvin.johnson@....nxp.com>
>
> Introduce a wrapper around the _ADR evaluation.
>
> Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

> ---
>
> Changes in v8: None
> Changes in v7: None
> Changes in v6: None
> Changes in v5:
> - Replace fwnode_get_id() with acpi_get_local_address()
>
> Changes in v4:
> - Improve code structure to handle all cases
>
> Changes in v3:
> - Modified to retrieve reg property value for ACPI as well
> - Resolved compilation issue with CONFIG_ACPI = n
> - Added more info into documentation
>
>  drivers/acpi/utils.c | 14 ++++++++++++++
>  include/linux/acpi.h |  7 +++++++
>  2 files changed, 21 insertions(+)
>
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index 3b54b8fd7396..e7ddd281afff 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -277,6 +277,20 @@ acpi_evaluate_integer(acpi_handle handle,
>
>  EXPORT_SYMBOL(acpi_evaluate_integer);
>
> +int acpi_get_local_address(acpi_handle handle, u32 *addr)
> +{
> +       unsigned long long adr;
> +       acpi_status status;
> +
> +       status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
> +       if (ACPI_FAILURE(status))
> +               return -ENODATA;
> +
> +       *addr = (u32)adr;
> +       return 0;
> +}
> +EXPORT_SYMBOL(acpi_get_local_address);
> +
>  acpi_status
>  acpi_evaluate_reference(acpi_handle handle,
>                         acpi_string pathname,
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index c60745f657e9..6ace3a0f1415 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -710,6 +710,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
>  }
>  #endif
>
> +int acpi_get_local_address(acpi_handle handle, u32 *addr);
> +
>  #else  /* !CONFIG_ACPI */
>
>  #define acpi_disabled 1
> @@ -965,6 +967,11 @@ static inline struct acpi_device *acpi_resource_consumer(struct resource *res)
>         return NULL;
>  }
>
> +static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
> +{
> +       return -ENODEV;
> +}
> +
>  #endif /* !CONFIG_ACPI */
>
>  #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
> --
> 2.31.1
>