linux-kernel - Re: [PATCH 1/4] ARM: multi_v7_defconfig: Enable common Rockchip devices/busses

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Date:	Mon, 7 Sep 2015 12:38:08 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	linux-rockchip@...ts.infradead.org
Cc:	linux-arm-kernel@...ts.infradead.org,
	Heiko Stuebner <heiko@...ech.de>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Thierry Reding <treding@...dia.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lee Jones <lee.jones@...aro.org>,
	Olof Johansson <olof@...om.net>, Ray Jui <rjui@...adcom.com>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH 1/4] ARM: multi_v7_defconfig: Enable common Rockchip
 devices/busses

Hello Sjoerd,

On 09/07/2015 12:24 PM, Sjoerd Simons wrote:
> On Mon, 2015-09-07 at 11:26 +0200, Javier Martinez Canillas wrote:
>> Hello Sjoerd,
>>
>> On 09/06/2015 10:16 PM, Sjoerd Simons wrote:
>>> Enable Rockchip I2C, SPI, PWM, thermal drivers.
>>>
>>> Builtin are:
>>>  * I2C as it often controls the pmic.
>>
>> Having I2C as a module will cause more probe deferrals due missing
>> regulators and slow down the boot but it should not cause issues.
>> Or am I missing something?
>>
>> In fact, I think even the PMIC could be built as a module.
> 
> It could in principle. However as a lot of other drivers do need the
> regulators provided by the pmic, they'll be deferred until that driver
> is loaded. So e.g. with the i2c/pmic drivers as a module you cannot
> boot to an NFS rootfs without using an initramfs. 
>

Right, not needing an initramfs is certainly a good reason. If you could
add something like that in the commit message of patches 1/4 and 2/4 that
would be great.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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