From: Stephen Warren <swarren@wwwdotorg.org>
To: Rob Herring <robh@kernel.org>
Cc: Sivaram Nair <sivaramn@nvidia.com>,
Joseph Lo <josephl@nvidia.com>,
Thierry Reding <thierry.reding@gmail.com>,
Alexandre Courbot <gnurou@gmail.com>,
linux-tegra@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>,
Peter De Schrijver <pdeschrijver@nvidia.com>,
Matthew Longnecker <MLongnecker@nvidia.com>,
devicetree@vger.kernel.org, Jassi Brar <jassisinghbrar@gmail.com>,
linux-kernel@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>
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 [thread overview]
Message-ID: <5783C468.2030708@wwwdotorg.org> (raw)
In-Reply-To: <20160711141407.GA25042@rob-hp-laptop>
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.
next prev parent reply other threads:[~2016-07-11 16:08 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-05 9:04 [PATCH V2 00/10] arm64: tegra: add BPMP support Joseph Lo
2016-07-05 9:04 ` [PATCH V2 01/10] Documentation: dt-bindings: mailbox: tegra: Add binding for HSP mailbox Joseph Lo
2016-07-06 17:02 ` Stephen Warren
2016-07-07 6:24 ` Joseph Lo
2016-07-07 18:13 ` Sivaram Nair
2016-07-07 18:35 ` Stephen Warren
2016-07-07 18:44 ` Sivaram Nair
2016-07-11 14:14 ` Rob Herring
2016-07-11 16:08 ` Stephen Warren [this message]
2016-07-18 23:13 ` Stephen Warren
2016-07-19 7:09 ` Joseph Lo
2016-07-05 9:04 ` [PATCH V2 02/10] mailbox: tegra-hsp: Add HSP(Hardware Synchronization Primitives) driver Joseph Lo
2016-07-06 7:05 ` Alexandre Courbot
2016-07-06 9:06 ` Joseph Lo
2016-07-06 12:23 ` Alexandre Courbot
2016-07-07 6:37 ` Joseph Lo
2016-07-07 21:33 ` Sivaram Nair
2016-07-18 8:58 ` Joseph Lo
2016-07-06 16:50 ` Stephen Warren
2016-07-07 6:49 ` Joseph Lo
2016-07-07 21:10 ` Sivaram Nair
2016-07-18 8:51 ` Joseph Lo
2016-07-05 9:04 ` [PATCH V2 03/10] Documentation: dt-bindings: firmware: tegra: add bindings of the BPMP Joseph Lo
2016-07-06 11:42 ` Alexandre Courbot
2016-07-07 6:25 ` Joseph Lo
2016-07-06 17:03 ` Stephen Warren
2016-07-07 6:26 ` Joseph Lo
2016-07-11 14:22 ` Rob Herring
2016-07-11 16:05 ` Stephen Warren
2016-07-18 7:44 ` Joseph Lo
2016-07-18 16:18 ` Stephen Warren
2016-07-13 19:41 ` Stephen Warren
2016-07-18 6:42 ` Joseph Lo
2016-07-05 9:04 ` [PATCH V2 04/10] firmware: tegra: add IVC library Joseph Lo
2016-07-07 11:16 ` Alexandre Courbot
2016-07-09 23:45 ` Paul Gortmaker
2016-07-05 9:04 ` [PATCH V2 05/10] firmware: tegra: add BPMP support Joseph Lo
2016-07-06 11:39 ` Alexandre Courbot
2016-07-06 16:39 ` Stephen Warren
2016-07-06 16:47 ` Matt Longnecker
2016-07-07 2:24 ` Alexandre Courbot
2016-07-07 8:17 ` Joseph Lo
2016-07-07 10:18 ` Alexandre Courbot
2016-07-07 19:55 ` Stephen Warren
2016-07-08 20:19 ` Sivaram Nair
2016-07-08 17:55 ` Sivaram Nair
2016-07-05 9:04 ` [PATCH V2 06/10] soc/tegra: Add Tegra186 support Joseph Lo
2016-07-05 9:04 ` [PATCH V2 07/10] arm64: defconfig: Enable Tegra186 SoC Joseph Lo
2016-07-05 9:04 ` [PATCH V2 08/10] arm64: dts: tegra: Add Tegra186 support Joseph Lo
2016-07-05 9:04 ` [PATCH V2 09/10] arm64: dts: tegra: Add NVIDIA Tegra186 P3310 main board support Joseph Lo
2016-07-05 9:04 ` [PATCH V2 10/10] arm64: dts: tegra: Add NVIDIA P2771 " Joseph Lo
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