linux-kernel - Re: [PATCH v3 0/2] mmc: dw_mmc: controller reset support

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Date:	Wed, 30 Mar 2016 19:45:05 +0800
From:	Shawn Lin <shawn.lin@...k-chips.com>
To:	Guodong Xu <guodong.xu@...aro.org>, jh80.chung@...sung.com,
	--to=robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	ulf.hansson@...aro.org
Cc:	shawn.lin@...k-chips.com,
	Heiko Stübner <heiko@...ech.de>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] mmc: dw_mmc: controller reset support

+ Heiko
On 2016/3/30 15:24, Guodong Xu wrote:
> mmc controller registers may in abnormal state if mmc is used in
> bootloader, eg. to load kernel from eMMC. Some controllers cann't
> clear their registers when clk is set. They use dedicated reset
> logics to do this.
>
> In this patch, a 'resets' property is added into dw_mmc dts
> node. When driver does parse_dt and probe, it calls reset API to
> deassert the 'reset' of dw_mmc host controller. When probe error or
> remove, it calls reset API to assert it.
>
> Chip vendor's actual reset logics is implemented in reset driver, not
> in dw_mmc code.
>
> Please also refer to Documentation/devicetree/bindings/reset/reset.txt
>
> Guodong Xu (2):
>    Documentation: synopsys-dw-mshc: add binding for resets
>    mmc: dw_mmc: add resets support to dw_mmc
>
>   .../devicetree/bindings/mmc/synopsys-dw-mshc.txt     |  4 ++++
>   drivers/mmc/host/dw_mmc.c                            | 20 +++++++++++++++++++-
>   include/linux/mmc/dw_mmc.h                           |  6 ++++--
>   3 files changed, 27 insertions(+), 3 deletions(-)
>


-- 
Best Regards
Shawn Lin