linux-kernel - Re: [PATCH] mmc: dw_mmc-rockchip: add pinctrl support

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Date:	Tue, 19 Jan 2016 19:45:07 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: dw_mmc-rockchip: add pinctrl support


在 2016年01月19日 19:07, Shawn Lin 写道:
> On 2016/1/19 18:07, Heiko Stuebner wrote:
>> Hi Shawn,
>>
>> Am Dienstag, 19. Januar 2016, 17:52:45 schrieb Shawn Lin:
>>> We find rk3368 fail to enumerate sd card since
>>> the default state is gpio function. Meahwhile, lots of
>>> rockchip platform dts file assign pinctrl to dw_mmc but actually
>>> dw_mmc never use it. Fortunately, those platforms' default io
>>> state is sdmmc function, but no always right for all.
>>>
>>> Cc: Heiko Stuebner <heiko@...ech.de>
>>> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
>>
>> I do believe any issue you see, must come from somewhere else, 
>> because the
>> driver-core does in drivers/base/dd.c really_probe():
>>     pinctrl_bind_pins()
>
> yes, pinctrl_bind_pins does turn pinctrl state. But I try debug a little
> more and seems somewhere else switch the state before dw_mmc probe. 
> Now I *guess* that may relate to our ATF or MCU firmware since 
> rk3368's sdmmc io can also be used as mcu_jtag for system debug. I 
> need to double check that point, thanks.
>

Yep,  maybe that's related to the firmware setting.
I guess you can repro this issue on RK3368 platform.
At least until now, the RK3036, RK3288....that's work well.


> Hi Caesar,
> does your patch able to consider adding SDMMC/CPU_JTAG/MCU_JTAG 
> managment for rk3368 as well?
>

That's no related,  I will add the sdmmc node and check it on tomorrow 
if the time can be availabled.


>> which in turn already does the needed pinctrl state handling.
>>
>> So that default-state should be set up even before the dwmmc probe 
>> function
>> is called.
>>
>> The sharing between sdmmc and uart2 pins is the same on the rk3036 
>> and so
>> far Caesar seems to have been able to switch the pin-state to sdmmc 
>> without
>> touching the dw_mmc driver itself.
>>

Yep, that's working on rk3036 kylin board.


---
Thanks,
Caesar