linux-kernel - Re: [PATCH 1/2] dt-bindings: dmaengine: add DT binding for UniPhier MIO DMAC

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Date:   Thu, 23 Aug 2018 19:42:32 +0530
From:   Jassi Brar <jaswinder.singh@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Vinod <vkoul@...nel.org>,
        "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: dmaengine: add DT binding for UniPhier
 MIO DMAC

On 23 August 2018 at 18:51, Rob Herring <robh+dt@...nel.org> wrote:
> On Thu, Aug 23, 2018 at 12:38 AM Jassi Brar <jaswinder.singh@...aro.org> wrote:
>> On 23 August 2018 at 10:48, Masahiro Yamada

>> >
>> > If desired, I will export of_irq_count()
>> > and use it from my driver.
>> >
>> If you don't want to leave too much footprint, you could do
>>
>>   count = 0;
>>   while (of_irq_parse_one(dev, count, &irq) == 0) count++
>>
>> of_irq_parse_one() is already exported.
>
> Yes, but we really don't more users and drivers shouldn't be using it.
> Grepping DT functions and when the only users are pretty much powerpc,
> that's a good indication not to use the function.
>
> And you don't want to use of_irq_count either. platform_irq_count is
> what should be used here. It's already exported.
>
Thanks, platform_irq_count() is definitely better.

Yamada-san, for example, gpio-tegra.c infers the number of banks from
platform_irq_count() rather than the 'gpio-banks' property.