linux-kernel - Re: [PATCH] serial: 8250: Add support for using platform

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Message-ID: <20190507093239.GB4529@dell>
Date:   Tue, 7 May 2019 10:32:39 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Esben Haabendal <esben@...bendal.dk>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-serial@...r.kernel.org, Enrico Weigelt <lkml@...ux.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Darwin Dingel <darwin.dingel@...iedtelesis.co.nz>,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        He Zhe <zhe.he@...driver.com>, Marek Vasut <marex@...x.de>,
        Douglas Anderson <dianders@...omium.org>,
        Paul Burton <paul.burton@...s.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250: Add support for using platform_device
 resources

On Thu, 02 May 2019, Esben Haabendal wrote:

> Hi Lee
> 
> Could you help clarify whether or not this patch is trying to do
> something odd/wrong?
> 
> I might be misunderstanding Andy (probably is), but the discussion
> revolves around the changes I propose where I change the serial8250
> driver to use platform_get_resource() in favour of
> request_mem_region()/release_mem_region().

Since 'serial8250' is registered as a platform device, I don't see any
reason why it shouldn't have the capability to obtain its memory
regions from the platform_get_*() helpers.

> In my understanding, use of platform_get_resource() is the right thing
> to do in order to integrate properly with with MFD drivers that splits a
> common memory resource in mfd_add_device() using the mem_base argument.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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