linux-kernel - Re: [PATCH 2/2 v2] Driver core: reduce duplicated code

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Message-ID: <AANLkTinMLrXyqKZ76AiWiw6N_glrWWrP-2_aUTzQm5Xr@mail.gmail.com>
Date:	Mon, 28 Jun 2010 12:55:45 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Greg KH <greg@...ah.com>, Randy Dunlap <rdunlap@...otime.net>,
	Dmitry Torokhov <dtor@...l.ru>,
	Anisse Astier <anisse@...ier.eu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Magnus Damm <damm@...nsource.se>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Paul Mundt <lethal@...ux-sh.org>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2 v2] Driver core: reduce duplicated code

2010/6/22 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>:
> Hi Greg,
>
>> > I changed the semantic slightly to only call
>> > platform_device_add_resources if data != NULL instead of size != 0.  The
>> > idea is to support wrappers like:
>> >
>> >     #define add_blablub(id, pdata) \
>> >             platform_device_register_resndata(NULL, "blablub", id, \
>> >                     NULL, 0, pdata, sizeof(struct blablub_platform_data))
>> >
>> > that don't fail if pdata=NULL.  Ditto for res.
>>
>> That's fine, but why would you want to have a #define for something like
>> this?  Is it really needed?
> Well, what is really needed?  I intend to use it on arm/imx.  I have
> several different machines using similar SoCs and so I want to have a
> function à la:
>
>        struct platform_device *__init imx_add_imx_i2c(int id,
>                resource_size_t iobase, resource_size_t iosize, int irq,
>                const struct imxi2c_platform_data *pdata)
>
> that builds a struct resource[] and then calls
> platform_device_register_resndata().  And then I have a set of macros
> like:
>
>        #define imx21_add_i2c_imx(pdata)        \
>                imx_add_imx_i2c(0, MX2x_I2C_BASE_ADDR, SZ_4K, MX2x_INT_I2C, pdata)
>        #define imx25_add_imx_i2c0(pdata)       \
>                imx_add_imx_i2c(0, MX25_I2C1_BASE_ADDR, SZ_16K, MX25_INT_I2C1, pdata)
>        ##define imx25_add_imx_i2c1(pdata)      \
>                imx_add_imx_i2c(1, MX25_I2C2_BASE_ADDR, SZ_16K, MX25_INT_I2C2, pdata)
>
> etc.  The final goal is to get rid of files like
> arch/arm/mach-mx3/devices.c.
>

Hi Uwe,

I suggest you to have a look into arch/arm/mach-mmp/devices.c and
arch/arm/mach-mmp/pxa{168,910}.c as well as
arch/arm/mach-mmp/include/mach/pxa{168,910}.h, maybe we can find
some common practice.

>> Anyway, this version looks fine to me, I'll go apply it.
> \o/
>
> Best regards and thanks
> Uwe
>
> --
> Pengutronix e.K.                           | Uwe Kleine-König            |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
>
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