linux-kernel - Re: [PATCH v6 1/2] soc: samsung: add exynos chipid driver support

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Date:	Wed, 25 May 2016 10:49:53 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Pankaj Dubey <pankaj.dubey@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	k.kozlowski@...sung.com, Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, thomas.ab@...sung.com,
	kgene@...nel.org, Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH v6 1/2] soc: samsung: add exynos chipid driver support

On Wednesday, May 25, 2016 1:28:23 PM CEST Pankaj Dubey wrote:
> Exynos SoCs have Chipid, for identification of product IDs
> and SoC revisions. This patch intends to provide initialization
> code for all these functionalities, at the same time it provides some
> sysfs entries for accessing these information to user-space.
> 
> This driver uses existing binding for exynos-chipid.
> 
> CC: Grant Likely <grant.likely@...aro.org>
> CC: Rob Herring <robh+dt@...nel.org>
> CC: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
> ---
>  drivers/soc/samsung/Kconfig            |   5 +
>  drivers/soc/samsung/Makefile           |   1 +
>  drivers/soc/samsung/exynos-chipid.c    | 172 +++++++++++++++++++++++++++++++++
>  include/linux/soc/samsung/exynos-soc.h |  51 ++++++++++
> 

I don't like how this exposes the internals of the samsung SoC in a global header
file, after we spent a considerable amount of work on keeping it confined
to arch/arm/{mach-exynos,mach-s3c64xx,plat-samsung}.

Please remove the external interface of the driver, in particular the global
data structure. We keep coming back to this for a lot of platforms, and
I still think we should have an architecture-independent way of matching
platforms to struct soc_device, using an exported function from drivers/base/soc.c
that uses glob_match() to compare a platform string against the running system.

	Arnd