From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kenneth Lee Subject: Re: [PATCH 3/5] net: add Hisilicon Network Subsystem MDIO support Date: Mon, 17 Aug 2015 17:17:50 +0800 Message-ID: <20150817091750.GA134983@Turing-Arch-b> References: <1439548222-231611-1-git-send-email-liguozhu@hisilicon.com> <1439548222-231611-4-git-send-email-liguozhu@hisilicon.com> <2142879.tTtWetb0nc@wuerfel> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: Content-Disposition: inline In-Reply-To: <2142879.tTtWetb0nc@wuerfel> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Arnd Bergmann Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org, galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, catalin.marinas-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, Yisen.Zhuang-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org, paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org, dingtianhong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, zhangfei.gao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linuxarm-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, salil.mehta-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, huangdaode-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org, Kenneth Lee List-Id: devicetree@vger.kernel.org Thanks, Arnd, You are right. This is the same IP as hip04_mdio.c. We just mis-understand the hardware design. We will merge them and re-submit the patches. On Fri, Aug 14, 2015 at 10:57:28PM +0200, Arnd Bergmann wrote: > On Friday 14 August 2015 18:30:20 Kenneth Lee wrote: > > > +#define MDIO_BASE_ADDR 0x403C0000 > > Does not belong in here (and is not used) > > > +#define MDIO_COMMAND_REG 0x0 > > +#define MDIO_ADDR_REG 0x4 > > +#define MDIO_WDATA_REG 0x8 > > +#define MDIO_RDATA_REG 0xc > > +#define MDIO_STA_REG 0x10 > > These look suspiciously similar to definitions from > drivers/net/ethernet/hisilicon/hip04_mdio.c. > > Could the hardware be related? If so, please try to share > the common parts. > > > +static inline void mdio_write_reg(void *base, u32 reg, u32 value) > > +{ > > + u8 __iomem *reg_addr = ACCESS_ONCE(base); > > + > > + writel(value, reg_addr + reg); > > +} > > + > > +#define MDIO_WRITE_REG(a, reg, value) \ > > + mdio_write_reg((a)->vbase, (reg), (value)) > > > > Something seems wrong here: why do you have an ACCESS_ONCE() on a > local variable? Doesn't this just make the code less efficient > without providing lockless access to shared variables? > > The types are inconsistent here, you should get a warning from > running this through 'make C=1' because of the missing __iomem > annotation of the pointer. > > Also, why both a macro and an inline function? Just use an inline > function. > > Arnd -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html