linux-kernel - Re: [PATCH v3 0/6] mmc: dw_mmc: add support for device tree based instantiation

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Message-ID: <CAJuYYwQBgpJ1wiS3fSDS2cMi6kanuO47rc8SmniAqjRPuBGJHg@mail.gmail.com>
Date:	Fri, 20 Jul 2012 00:29:08 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Jaehoon Chung <jh80.chung@...sung.com>
Cc:	linux-mmc@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	cjb@...top.org, grant.likely@...retlab.ca, rob.herring@...xeda.com,
	linux-samsung-soc@...r.kernel.org, kgene.kim@...sung.com,
	patches@...aro.org
Subject: Re: [PATCH v3 0/6] mmc: dw_mmc: add support for device tree based instantiation

On 19 July 2012 20:58, Jaehoon Chung <jh80.chung@...sung.com> wrote:
> Hi Thomas,
>
> I think not good that added the samsung specific code into dw_mmc-pltfm.c
> How about separating to dw-mmc-exynos.c?

I am not sure of this. The only samsung specific code in
dw_mmc-pltfm.c file is the data for of_device_id instances. The clock
lookup added into this file in the 3rd patch does not cause any harm
on non-samsung SoC's which might not define those clocks (on clock
lookup failure, there are only warning printed, the driver's probe
does not fail.

I would prefer not to add separate file for Exynos SoC's for now.
Splitting into different files will need to defined new callbacks
which I fell is not really required.

Thanks,
Thomas.

>
> Best Regards,
> Jaehoon Chung
>
> On 07/12/2012 09:54 PM, Thomas Abraham wrote:
>> This patch series adds device tree support for Synopsis Designware Mobile
>> Storage Host Controller.
>>
>> The first patch converts the copy of controller device instance into a
>> reference. This is need to allow device resource management api to correctly
>> manage the resources allocated by the driver. The second patch fixes the
>> incorrect abort of the probe in case a slot initialization fails. This is
>> fixed by allowing as many slots to be initialized successfully and failing
>> only if there are no slots that were initialized.
>>
>> The third patch adds clock lookup in the driver and this is optional. Platforms
>> that do not need any clock gating and control for the dw_mmc controllers will
>> not be affected with this change. The fourth patch adds a quirk to notify the
>> controller about the absence of the write protect line.
>>
>> The fifth patch adds device tree based discovery support for the dw_mmc driver.
>> The sixth patch add Samsung Exynos5250 specific extentions to the driver.
>>
>> This patchset is based on Samsung kernel tree's for-next branch with the
>> mmc tree's mmc-next branch merged.
>>
>> Thomas Abraham (6):
>>   mmc: dw_mmc: convert copy of struct device in struct dw_mci to a reference
>>   mmc: dw_mmc: allow probe to succeed even if one slot is initialized
>>   mmc: dw_mmc: lookup for optional biu and ciu clocks
>>   mmc: dw_mmc: add quirk to indicate missing write protect line
>>   mmc: dw_mmc: add device tree support
>>   mmc: dw_mmc: add samsung exynos5250 specific extentions
>>
>>  .../devicetree/bindings/mmc/synposis-dw-mshc.txt   |  144 ++++++++
>>  drivers/mmc/host/dw_mmc-pci.c                      |    2 +-
>>  drivers/mmc/host/dw_mmc-pltfm.c                    |   41 +++-
>>  drivers/mmc/host/dw_mmc.c                          |  364 +++++++++++++++++---
>>  drivers/mmc/host/dw_mmc.h                          |   23 ++
>>  include/linux/mmc/dw_mmc.h                         |   17 +-
>>  6 files changed, 538 insertions(+), 53 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt
>>
>> --
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>
>
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