linux-kernel - Re: [PATCH v1 17/43] dt-bindings: spi: Add Cirrus EP93xx

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Message-ID: <20230601154154.57ae1b93@redslave.neermore.group>
Date:   Thu, 1 Jun 2023 15:41:54 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Mark Brown <broonie@...nel.org>
Cc:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Peters <mpeters@...eddedts.com>,
        Kris Bahnsen <kris@...eddedts.com>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 17/43] dt-bindings: spi: Add Cirrus EP93xx

Hello Mark!

On Thu, 1 Jun 2023 12:17:27 +0100
Mark Brown <broonie@...nel.org> wrote:

> On Thu, Jun 01, 2023 at 08:34:08AM +0300, Nikita Shubin wrote:
> 
> > +  cirrus,ep9301-use-dma:
> > +    description: Flag indicating that the SPI should use dma
> > +    type: boolean  
> 
> My previous feedback on this property still applies.
> 
> Please don't ignore review comments, people are generally making them
> for a reason and are likely to have the same concerns if issues remain
> unaddressed.  Having to repeat the same comments can get repetitive
> and make people question the value of time spent reviewing.  If you
> disagree with the review comments that's fine but you need to reply
> and discuss your concerns so that the reviewer can understand your
> decisions.

Sorry - that was totally unintentional, i was tinkering with spi and
got distracted on other part of this series (it's quite big for me,
first time tinkering with a series more than 5-6 patches).

> > +  cirrus,ep9301-use-dma:

The reason is that ep93xx DMA state is not quite device-tree ready at
this moment, and clients use it with the help of:

https://elixir.bootlin.com/linux/v6.4-rc4/source/include/linux/platform_data/dma-ep93xx.h

I was hoping to slip by without changing much in ep93xx DMA driver, so
i can deal with it later, especially seeing it's having some quirks
like:

https://elixir.bootlin.com/linux/v6.4-rc4/source/drivers/dma/ep93xx_dma.c#L471

And edb93xx and bk3 don't set use_dma with SPI for some reason.

I can move "use-dma" to module parameters, if this is acceptable.