From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: Re: [PATCH v2 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC Date: Tue, 22 Jul 2014 16:56:45 +0100 Message-ID: <20140722155645.GD23210@lee--X1> References: <1404541530-27856-1-git-send-email-peter.griffin@linaro.org> <1404541530-27856-2-git-send-email-peter.griffin@linaro.org> <20140707124627.GG6407@lee--X1> <20140722091800.GB8233@griffinp-ThinkPad-X1-Carbon-2nd> <20140722145711.GC20588@saruman.home> <20140722154503.GC23210@lee--X1> <20140722155117.GF20588@saruman.home> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <20140722155117.GF20588-HgARHv6XitL9zxVx7UNMDg@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Felipe Balbi Cc: Peter Griffin , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, maxime.coquelin-qxv4g6HH51o@public.gmane.org, patrice.chotard-qxv4g6HH51o@public.gmane.org, srinivas.kandagatla-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, peppe.cavallaro-qxv4g6HH51o@public.gmane.org List-Id: devicetree@vger.kernel.org On Tue, 22 Jul 2014, Felipe Balbi wrote: > On Tue, Jul 22, 2014 at 04:45:03PM +0100, Lee Jones wrote: > > > > > > +static void st_dwc3_init(struct st_dwc3 *dwc3_data) > > > > > > +{ > > > > > > + u32 reg =3D st_dwc3_readl(dwc3_data->glue_base, USB2_CLKR= ST_CTRL); > > > > > > + > > > > > > + reg |=3D aux_clk_en(1) | ext_cfg_reset_n(1) | xhci_revisi= on(1); > > > > > > + reg &=3D ~sw_pipew_reset_n(1); > > > > >=20 > > > > > 1? Better to add defines for these magic numbers. What is 1= anyway? > > > >=20 > > > > They are just bit setting macros, I've converted them over to u= se BIT macro now, > > > > so it no longer takes a parameter. > > >=20 > > > the macros are better, but make them upper case as everybody else= =2E > >=20 > > When you say that the macros are better, what do you mean? > >=20 > > Defines do the job in a manner which is a great deal cleaner: > >=20 > > #define AUX_CLK_EN BIT(0) > > #define SW_PIPEW_RESET_N BIT(4) > > #define EXT_CFG_RESET_N BIT(8) > > #define XHCI_REVISION BIT(12) > >=20 > > reg =3D AUX_CLK_EN | SW_PIPEW_RESET_N | XHCI_REVISION; > > reg &=3D ~SW_PIPEW_RESET_N >=20 > this is what I meant ;-) I see what I wrote can be very ambiguous :-p Okay great, thanks for clarifying. :) --=20 Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org =E2=94=82 Open source software for ARM SoCs =46ollow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html