linux-kernel - Re: [PATCH 1/4] amba: Export amba

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Message-ID: <CAHp75VfGpS_QkLj4XM8uHW0BAJV0EBWZ_yLP0R2D+ok4Mt=SQg@mail.gmail.com>
Date:   Wed, 16 May 2018 12:16:28 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Kim Phillips <kim.phillips@....com>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Gargi Sharma <gs051095@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Rik van Riel <riel@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Russell King <linux@...linux.org.uk>,
        Thierry Reding <treding@...dia.com>,
        Todd Kjos <tkjos@...gle.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] amba: Export amba_bustype

On Tue, May 8, 2018 at 10:06 PM, Kim Phillips <kim.phillips@....com> wrote:
> This patch is provided in the context of allowing the Coresight driver
> subsystem to be loaded as modules.  Coresight uses amba_bus in its call
> to bus_find_device() in of_coresight_get_endpoint_device() when
> searching for a configurable endpoint device.  This patch allows
> Coresight to reference amba_bustype when built as a module.

> --- a/drivers/amba/bus.c
> +++ b/drivers/amba/bus.c
> @@ -197,6 +197,7 @@ struct bus_type amba_bustype = {
>         .pm             = &amba_pm,
>         .force_dma      = true,
>  };
> +EXPORT_SYMBOL_GPL(amba_bustype);

Oh,

What wrong with the approach let's say similar to PCI bus?

Whenever you have a struct device you may use two helpers:

dev_is_pci() -> is the device of PCI bus type?
to_pci_dev() -> get's container of struct device for PCI bus case

-- 
With Best Regards,
Andy Shevchenko