linux-kernel - Re: [PATCH v2 0/7] Add support for Exynos SROM Controller driver

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Message-ID: <5612719E.60006@samsung.com>
Date:	Mon, 5 Oct 2015 21:48:30 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Pavel Fedin <p.fedin@...sung.com>,
	'Pankaj Dubey' <pankaj.dubey@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc:	k.kozlowski.k@...il.com, thomas.ab@...sung.com, kgene@...nel.org,
	heiko@...ech.de
Subject: Re: [PATCH v2 0/7] Add support for Exynos SROM Controller driver

W dniu 05.10.2015 o 20:36, Pavel Fedin pisze:
>  Hello!
> 
>> This patch set adds support for Exynos SROM controller DT based driver.
>> Currently SROM register sets are used only during S2R, so driver
>> basically added for taking care of S2R. It will help us in removing
>> static mapping from exynos.c and other extra code handline during S2R.
> 
>  Very good news, but, your driver seems not to do anything except suspend/resume. But how do i add
> some device plugged into it? In order to be operational, its outputs have to be configured. But how
> do i do it with your driver? For example, on SMDK boards SROM controller is used to connect SMSC9111
> etherner chip.

That is interesting. What do you mean by that? Although SROM controller
can access external memory (SRAM, ROM) but it is not exactly a bus. How
is the SMSC9111 "connected"? What interface or protocol is used?

>  Currently i use hardcoded initialization based on of_machine_is_compatible(), but i believe this
> would be considered a hack and such a thing cannot be pushed upstream. I guess i have to put all
> needed configuration into device tree somehow. But how? Are there any recommentations?

I am sorry but I cannot figure out what exactly are you talking about.
The Device Tree is the glue to describe the board, the hardware and its
configuration. Please elaborate a little more.

Best regards,
Krzysztof

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