From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: [PATCH V2 01/10] Documentation: dt-bindings: mailbox: tegra: Add binding for HSP mailbox Date: Mon, 11 Jul 2016 10:08:08 -0600 Message-ID: <5783C468.2030708@wwwdotorg.org> References: <20160705090431.5852-1-josephl@nvidia.com> <20160705090431.5852-2-josephl@nvidia.com> <20160707181356.GA6864@kickseed.nvidia.com> <577EA0D6.9020308@wwwdotorg.org> <20160711141407.GA25042@rob-hp-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160711141407.GA25042@rob-hp-laptop> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Rob Herring Cc: Sivaram Nair , Joseph Lo , Thierry Reding , Alexandre Courbot , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Mark Rutland , Peter De Schrijver , Matthew Longnecker , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jassi Brar , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Catalin Marinas , Will Deacon List-Id: devicetree@vger.kernel.org On 07/11/2016 08:14 AM, Rob Herring wrote: > On Thu, Jul 07, 2016 at 12:35:02PM -0600, Stephen Warren wrote: >> On 07/07/2016 12:13 PM, Sivaram Nair wrote: >>> On Tue, Jul 05, 2016 at 05:04:22PM +0800, Joseph Lo wrote: >>>> Add DT binding for the Hardware Synchronization Primitives (HSP). The >>>> HSP is designed for the processors to share resources and communicate >>>> together. It provides a set of hardware synchronization primitives for >>>> interprocessor communication. So the interprocessor communication (IPC) >>>> protocols can use hardware synchronization primitive, when operating >>>> between two processors not in an SMP relationship. >> >>>> diff --git a/include/dt-bindings/mailbox/tegra186-hsp.h b/include/dt-bindings/mailbox/tegra186-hsp.h >> >>>> +#define HSP_MBOX_TYPE_DB 0x0 >>>> +#define HSP_MBOX_TYPE_SM 0x1 >>>> +#define HSP_MBOX_TYPE_SS 0x2 >>>> +#define HSP_MBOX_TYPE_AS 0x3 >>>> + >>>> +#define HSP_DB_MASTER_CCPLEX 17 >>>> +#define HSP_DB_MASTER_BPMP 19 >>>> + >>>> +#define HSP_MBOX_ID(type, ID) \ >>>> + (HSP_MBOX_TYPE_##type << 16 | ID) >>> >>> It will be nicer if you avoid the macro glue magic '##' for 'type'. I >>> would also suggest to use braces around 'type' and 'ID'. >> >> This technique been used without issue in quite a few other places without >> issue, and has the benefit of simplifying the text wherever the macro is >> used. What issue do you foresee? > > I'm not a fan of using the macros to begin with and less so anything > more complex than a single constant value. I'd rather see 2 cells here > with the first being the id and the 2nd being the type. > > An issue with token pasting is grepping for DB, SM, etc. in kernel tree > is probably noisy. Not such a big deal here, but a major PIA when you > have more complex sets of includes. Is that a NAK or simply a suggestion? Having a single cell makes DT parsing a bit simpler, since pretty much every SW stack provides a default "one-cell" of_xlate implementation, whereas >1 cell means custom code for of_xlate. -- 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