From: Haojian Zhuang <haojian.zhuang-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Sebastian Andrzej Siewior
<bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: David Brownell
<dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
eric.y.miao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
Mark Brown
<broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>,
linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
sodaville-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Dirk Brandewie
<dirk.brandewie-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org,
drwyrm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH 1/9] spi/pxa2xx: don't use subys initcall for driver init
Date: Wed, 24 Nov 2010 22:14:31 +0800 [thread overview]
Message-ID: <AANLkTimxjiYkbaHUzq_V-s9WWytgbpNSo8xe8V_Lm6uF@mail.gmail.com> (raw)
In-Reply-To: <4CED1C95.8070300-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
On Wed, Nov 24, 2010 at 10:09 PM, Sebastian Andrzej Siewior
<bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org> wrote:
> Haojian Zhuang wrote:
>>
>> Hi Sebastian,
>
> Hi Hoajian,
>
>> Actually it's added for cpufreq usage. We can check the commit in below.
>>
>> pxa2xx_spi: register earlier
>>
>> Register pxa2xx_spi earlier so it can be used with cpufreq
>>
>> So I think that this modifcation may cause others brokne.
>
> I've been pointed out to this commit but I don't understand _why_.
> The part I don't get is "so it can be used with cpufreq". Is it
> refered to a driver or the subsystem as it?
>
As we know, cpufreq is used to adjust frequency and voltage of CPU. We
need some interface to access PMIC hardware, such as I2C, SPI, .... So
I think that they need SPI to initialize first. Otherwise, they may
meet failure on accessing PMIC hardware.
Thanks
Haojian
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next prev parent reply other threads:[~2010-11-24 14:14 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-24 11:13 SPI support for Sodaville Sebastian Andrzej Siewior
[not found] ` <1290597207-29838-1-git-send-email-bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2010-11-24 11:13 ` [PATCH 1/9] spi/pxa2xx: don't use subys initcall for driver init Sebastian Andrzej Siewior
2010-11-24 13:18 ` Antonio Ospite
[not found] ` <1290597207-29838-2-git-send-email-bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2010-11-24 13:54 ` Haojian Zhuang
[not found] ` <AANLkTin4vh85XRkEd7YocCmKngViR_qZDe7z1b4JXyd--JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-11-24 14:09 ` Sebastian Andrzej Siewior
[not found] ` <4CED1C95.8070300-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2010-11-24 14:14 ` Haojian Zhuang [this message]
2010-11-24 14:16 ` Mark Brown
[not found] ` <20101124141623.GH24970-HF5t3jzXg/6ND3a5+9QAFujbO/Zr0HzV@public.gmane.org>
2010-11-24 15:30 ` Grant Likely
[not found] ` <AANLkTikC+XW7JtJO77vQL99=d9FKpO2tLtkCuxE57j7o-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-11-24 15:43 ` Mark Brown
2010-11-24 15:39 ` Sebastian Andrzej Siewior
[not found] ` <4CED3199.2040700-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2010-11-25 23:54 ` Russell King - ARM Linux
[not found] ` <20101125235415.GA9310-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2010-11-26 1:14 ` Grant Likely
[not found] ` <AANLkTi=tbiYCvTKH_wDDE0QuFpoBMnw-ZjF826VupnRA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-11-26 9:08 ` Russell King - ARM Linux
2010-11-26 10:50 ` [sodaville] " Sebastian Andrzej Siewior
2010-11-26 11:06 ` Russell King - ARM Linux
[not found] ` <20101126110605.GI9310-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2010-11-26 13:29 ` Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 2/9] spi/pxa2xx: add support for shared IRQ handler Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 3/9] spi/pxa2xx: Use define for SSSR_TFL_MASK instead of plain numbers Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 4/9] arm/pxa2xx: reorgazine SSP and SPI header files Sebastian Andrzej Siewior
[not found] ` <1290597207-29838-5-git-send-email-bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2010-11-24 14:03 ` Haojian Zhuang
[not found] ` <AANLkTinBFQZkuH4haeQAZQv8p0WZN5uh4xJj53sjUGTt-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-11-24 14:13 ` Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 5/9] spi/pxa2xx: Add CE4100 support Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 6/9] spi/pxa2xx: Consider CE4100's FIFO depth Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 7/9] spi/pxa2xx: Add chipselect support for Sodaville Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 8/9] spi/pxa2xx: Modify RX-Tresh instead of busy-loop for the remaining RX bytes Sebastian Andrzej Siewior
2010-11-24 11:13 ` [PATCH 9/9] spi/pxa2xx: pass of_node to spi device and set a parent device Sebastian Andrzej Siewior
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