linux-kernel - Re: [PATCH 1/5] soc: mediatek: Add SMI driver

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Date:	Fri, 06 Mar 2015 12:30:45 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	yong.wu@...iatek.com
Cc:	Rob Herring <robh+dt@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Robin Murphy <robin.murphy@....com>,
	Will Deacon <will.deacon@....com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-mediatek@...ts.infradead.org,
	Sasha Hauer <kernel@...gutronix.de>,
	srv_heupstream@...iatek.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 1/5] soc: mediatek: Add SMI driver

On Fri, 2015-03-06 at 18:48 +0800, yong.wu@...iatek.com wrote:
> --- a/drivers/soc/mediatek/Kconfig
> +++ b/drivers/soc/mediatek/Kconfig
> @@ -20,3 +20,10 @@ config MT8173_PMIC_WRAP
>  	  PMIC wrapper is a proprietary hardware in MT8173 to make
>  	  communication protocols to access PMIC device.
>  	  This driver implement access protocols for MT8173.
> +
> +config MTK_SMI
> +        bool

Nit: make this one tab instead of 8 spaces, please.

> +	help
> +	  Smi help enable/disable iommu in mt8173 and control the
> +	  clock of each local arbiter.
> +	  It should be true while MTK_IOMMU enable.

I don't think anyone using the *config tools will ever see this text, as
there's no prompt. So you might as well make this a comment or drop it
altogether.

Is this selected by more than just MTK_IOMMU (see 2/5)? If not, I think
MTK_SMI will be set and unset in lockstep with MTK_IOMMU. In other
words, you could as well use one Kconfig symbol.

Thanks,


Paul Bolle

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