linux-kernel - Re: [PATCH 1/7] usb: gadget: pxa25x_udc: move register definitions from arch

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Date:	Fri, 29 Jan 2016 10:32:07 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Felipe Balbi <balbi@...nel.org>, Imre Kaloz <kaloz@...nwrt.org>,
	Krzysztof Halasa <khalasa@...p.pl>,
	Russell King <linux@....linux.org.uk>,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] usb: gadget: pxa25x_udc: move register definitions from arch

Arnd Bergmann <arnd@...db.de> writes:

> ixp4xx and pxa25x both use this driver and provide a slightly
> different set of register definitions for it. Aside from that,
> the definition in the ixp4xx-regs.h header conflicts with the
> on in the pxa27x device driver when compile-testing that:
>
> In file included from ../drivers/usb/gadget/udc/pxa27x_udc.c:37:0:
> ../drivers/usb/gadget/udc/pxa27x_udc.h:26:0: warning: "UDCCR" redefined
>  #define UDCCR  0x0000  /* UDC Control Register */
>  ^
> In file included from ../arch/arm/mach-ixp4xx/include/mach/hardware.h:27:0,
>                  from ../arch/arm/mach-ixp4xx/include/mach/io.h:18,
>                  from ../arch/arm/include/asm/io.h:194,
>                  from ../include/linux/io.h:25,
>                  from ../include/linux/irq.h:24,
>                  from ../drivers/usb/gadget/udc/pxa27x_udc.c:23:
> ../arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h:415:0: note: this is the location of the previous definition
>  #define UDCCR  IXP4XX_USB_REG(IXP4XX_USB_BASE_VIRT+0x0000)
>
> This addresses both issues by moving all the definitions into the
> pxa25x_udc driver itself. It turns out the only difference between
> them was 'UDCCS_IO_ROF', and that could well be a mistake when it
> was incorrectly copied from pxa25x to ixp4xx.
Hi Arnd,

Is there a reason to have chosen to move into pxa25_udc.c instead of
drivers/usb/gadget/udc/pxa25x_udc.h ? pxa27x_udc has a .h in the same directory
with register definitions, hence the question.

Cheers.

--
Robert