From: Jaehoon Chung <jh80.chung@samsung.com>
To: Pavel Machek <pavel@denx.de>, Jaehoon Chung <jh80.chung@samsung.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, Ulf Hansson <ulf.hansson@linaro.org>,
kgene.kim@samsung.com, heiko@sntech.de, tgih.jun@samsung.com,
linux-mmc <linux-mmc@vger.kernel.org>,
Chris Ball <chris@printf.net>,
linux-samsung-soc@vger.kernel.org, dinguyen@altera.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCHv10 0/5] ARM: remove the sub-node and deprecate supports-highspeed property for dwmmc.
Date: Wed, 27 Aug 2014 12:11:55 +0900 [thread overview]
Message-ID: <53FD4C7B.2030008@samsung.com> (raw)
In-Reply-To: <20140826101923.GA13619@amd>
Hi,
On 08/26/2014 07:19 PM, Pavel Machek wrote:
> Hi!
>
>>>> Would you elaborate?
>>>>
>>>> If I have a device like a phone, I may want to put one "slot" inside
>>>> phone for basic system, and offer second slot for user expansion
>>>> (initially empty).
>>>
>>> if multiple slot is supported, then a mmcqd should be processing for multiple slots.
>>> It's too inefficient, and affect the whole performance reduction.
>> Sorry, Discard this comment. it means dwmci, not mmcqd.
>
> Well, that's a Linux problem, and for many applications, not even
> problem at all.
>
> Device tree should describe hardware, and hardware can do multiple
> slots per controller, so device tree should describe multiple slots
> per controller.
>
> Now, the configuration may be uncommon, but you are moving from good
> hardware description to bad hardware description.
Well, i don't think it's bad hardware description. And this policy is suggested by other mmc developers and maintainers.
At first time, I had also suggested same opinion with yours.
Refer to below..
https://patchwork.kernel.org/patch/4276481/
Best Regards,
Jaehoon Chung
>
> Pavel
>
next prev parent reply other threads:[~2014-08-27 3:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-07 7:37 [PATCHv10 0/5] ARM: remove the sub-node and deprecate supports-highspeed property for dwmmc Jaehoon Chung
2014-08-07 7:37 ` [PATCHv10 1/5] mmc: dw_mmc: Slot quirk "disable-wp" is deprecated Jaehoon Chung
2014-08-11 9:45 ` Ulf Hansson
2014-08-07 7:37 ` [PATCHv10 2/5] mmc: dw_mmc: modify the dt-binding for removing slot-node and supports-highspeed Jaehoon Chung
2014-08-11 9:46 ` Ulf Hansson
[not found] ` <1407397082-32495-1-git-send-email-jh80.chung-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2014-08-07 7:38 ` [PATCHv10 3/5] ARM: dts: exynos: unuse the slot-node and deprecate the supports-highspeed for dw-mmc Jaehoon Chung
2014-08-18 12:23 ` Jaehoon Chung
2014-08-18 14:10 ` Andreas Färber
2014-08-18 16:54 ` Kukjin Kim
2014-08-18 17:06 ` Andreas Färber
2014-08-18 17:40 ` Kukjin Kim
2014-08-19 3:52 ` Jaehoon Chung
2014-08-07 7:38 ` [PATCHv10 4/5] ARM: dts: socfpga: " Jaehoon Chung
2014-08-11 21:03 ` Dinh Nguyen
2014-08-07 7:38 ` [PATCHv10 5/5] ARM: dts: rockchip: " Jaehoon Chung
2014-08-11 14:38 ` Heiko Stübner
2014-08-25 11:21 ` [PATCHv10 0/5] ARM: remove the sub-node and deprecate supports-highspeed property for dwmmc Pavel Machek
2014-08-25 11:28 ` Jaehoon Chung
2014-08-25 11:37 ` Pavel Machek
2014-08-25 12:09 ` Jaehoon Chung
2014-08-25 12:11 ` Jaehoon Chung
2014-08-26 10:19 ` Pavel Machek
2014-08-27 3:11 ` Jaehoon Chung [this message]
2014-08-27 11:56 ` Pavel Machek
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