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Subject: Re: [PATCH 1/4] ARM: multi_v7_defconfig: Enable common Rockchip
 devices/busses
To: Sjoerd Simons <sjoerd.simons@collabora.co.uk>,
        linux-rockchip@lists.infradead.org
References: <1441570566-14001-1-git-send-email-sjoerd.simons@collabora.co.uk>
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 <55ED585B.9030009@osg.samsung.com> <1441621467.8778.26.camel@collabora.co.uk>
Cc: linux-arm-kernel@lists.infradead.org, Heiko Stuebner <heiko@sntech.de>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <k.kozlowski@samsung.com>,
        Thierry Reding <treding@nvidia.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        linux-kernel@vger.kernel.org, Russell King <linux@arm.linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@free-electrons.com>,
        Arnd Bergmann <arnd@arndb.de>, Lee Jones <lee.jones@linaro.org>,
        Olof Johansson <olof@lixom.net>, Ray Jui <rjui@broadcom.com>,
        Stephen Warren <swarren@nvidia.com>
From: Javier Martinez Canillas <javier@osg.samsung.com>
Message-ID: <55ED6910.8010202@osg.samsung.com>
Date: Mon, 7 Sep 2015 12:38:08 +0200
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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