linux-kernel - Re: [PATCH 3/7] usb: gadget: pxa25x

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Date:	Fri, 29 Jan 2016 11:17:01 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Felipe Balbi <balbi@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, Felipe Balbi <balbi@...com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Daniel Mack <daniel@...que.org>,
	Imre Kaloz <kaloz@...nwrt.org>,
	Krzysztof Halasa <khalasa@...p.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 3/7] usb: gadget: pxa25x_udc: use readl/writel for mmio

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

> This converts the pxa25x udc driver to use readl/writel as normal
> driver should do, rather than dereferencing __iomem pointers
> themselves.
>
> Based on the earlier preparation work, we can now also pass
> the register start in the device pointer so we no longer need
> the global variable.
>
> The unclear part here is for IXP4xx, which supports both big-endian
> and little-endian configurations. So far, the driver has done
> no byteswap in either case. I suspect that is wrong and it would
> actually need to swap in one or the other case, but I don't know
> which. It's also possible that there is some magic setting in
> the chip that makes the endianess of the MMIO register match the
> CPU, and in that case, the code actually does the right thing
> for all configurations, both before and after this patch.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
For pxa25x_udc:
Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>

Cheers.

--
Robert