linux-kernel - Re: [PATCH] ACPI: bus.c: Let acpi_device_get_match

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Date:   Wed, 4 Jul 2018 13:36:04 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Ray Jui <ray.jui@...adcom.com>,
        Vladimir Olovyannikov <vladimir.olovyannikov@...adcom.com>,
        Vikram Prakash <vikram.prakash@...adcom.com>,
        Scott Branden <scott.branden@...adcom.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Srinath Mannam <srinath.mannam@...adcom.com>, nv@...n.de
Subject: Re: [PATCH] ACPI: bus.c: Let acpi_device_get_match_data() return DT
 compatibility data

On Tue, Jul 3, 2018 at 9:09 AM, Nikolaus Voss
<nikolaus.voss@...wensteinmedical.de> wrote:
> When using ACPI with ACPI_DT_NAMESPACE_HID/ PRP0001 HID and referring to
> of_device_id table "compatible" strings in DSD, a pointer to the
> corresponding DT table entry should be returned instead of a null
> pointer. An acpi_device_id match still takes precedence.

AFAIU it's just bounce for new comers to the discussion.
The patch is in its original form and didn't incorporate any review
comments so far.

> Signed-off-by: Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
> ---
>  drivers/acpi/bus.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 84b4a62018eb..c2deffea842e 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -832,13 +832,18 @@ EXPORT_SYMBOL_GPL(acpi_match_device);
>
>  const void *acpi_device_get_match_data(const struct device *dev)
>  {
> -       const struct acpi_device_id *match;
> +       const struct acpi_device_id *acpi_id = NULL;
> +       const struct of_device_id *of_id = NULL;
> +       const struct device_driver *drv = dev->driver;
>
> -       match = acpi_match_device(dev->driver->acpi_match_table, dev);
> -       if (!match)
> +       __acpi_match_device(acpi_companion_match(dev), drv->acpi_match_table,
> +                           drv->of_match_table, &acpi_id, &of_id);
> +       if (acpi_id)
> +               return (const void*)acpi_id->driver_data;
> +       else if (of_id)
> +               return (const void*)of_id->data;
> +       else
>                 return NULL;
> -
> -       return (const void *)match->driver_data;
>  }
>  EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
>
> --
> 2.17.1
>



-- 
With Best Regards,
Andy Shevchenko