linux-kernel - Re: using mmc2 on panda [was: Regression 3.11-rc1: omap4panda: no usb and consequently no ethernet]

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Date:	Wed, 2 Oct 2013 12:20:40 +0200
From:	"Arend van Spriel" <arend@...adcom.com>
To:	"Luca Coelho" <luca@...lho.fi>
cc:	"Roger Quadros" <rogerq@...com>,
	"Tony Lindgren" <tony@...mide.com>, linux-omap@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: using mmc2 on panda [was: Regression 3.11-rc1: omap4panda:
 no usb and consequently no ethernet]

On 10/01/2013 01:29 PM, Luca Coelho wrote:
> Hi,
>
> On Tue, 2013-10-01 at 12:53 +0200, Arend van Spriel wrote:
>> On 10/01/2013 11:53 AM, Roger Quadros wrote:
>>> On 10/01/2013 12:49 PM, Roger Quadros wrote:
>>>> Hi Arend,
>>>>
>>>> On 10/01/2013 11:05 AM, Arend van Spriel wrote:
>>>>> On 07/19/2013 12:57 PM, Arend van Spriel wrote:
>>>>>> On 07/19/2013 12:49 PM, Roger Quadros wrote:
>>>>>>> On 07/19/2013 01:36 PM, Arend van Spriel wrote:
>>>>>>>> On 07/18/2013 10:59 AM, Tony Lindgren wrote:
>>>>>>>>> Then for the SDIO with device tree, take a look at the following
>>>>>>>>> patches:
>>>>>>>>>
>>>>>>>>> [PATCH 0/3] WLAN support for omap4 when booted with devicetree
>>>>>>>>> http://comments.gmane.org/gmane.linux.ports.arm.omap/97522#
>>>>>>>>
>>>>>>>> I have been looking at the pandaboard patch in the series above and I
>>>>>>>> do have a question. Among other things the patch adds these dt entries.
>>>>>>>>
>>>>>>>> +            0x108 0x118    /* sdmmc5_clk.sdmmc5_clk INPUT_PULLUP |
>>>>>>>> MODE0 */
>>>>>>>> +            0x10a 0x118    /* sdmmc5_cmd.sdmmc5_cmd INPUT_PULLUP |
>>>>>>>> MODE0 */
>>>>>>>>
>>>>>>>> If I look at the similar names in the deceased board-omap4panda.c:
>>>>>>>>
>>>>>>>> board-omap4panda.c:    OMAP4_MUX(SDMMC5_CMD, OMAP_MUX_MODE0 |
>>>>>>>> OMAP_PIN_INPUT_PULLUP),
>>>>>>>> board-omap4panda.c:    OMAP4_MUX(SDMMC5_CLK, OMAP_MUX_MODE0 |
>>>>>>>> OMAP_PIN_INPUT_PULLUP),
>>>>>>>>
>>>>>>>> and in mux44xx.h:
>>>>>>>>
>>>>>>>> mux44xx.h:#define OMAP4_CTRL_MODULE_PAD_SDMMC5_CLK_OFFSET    0x0148
>>>>>>>> mux44xx.h:#define OMAP4_CTRL_MODULE_PAD_SDMMC5_CMD_OFFSET    0x014a
>>>>>>>>
>>>>>>>> So how did 0x0148 get 0x0108 in DT and 0x014a get 0x010a. There is
>>>>>>>> probably an explanation to it and it would help my understanding to
>>>>>>>> know where this difference comes from. Hope you can help me out here.
>>>>>>>>
>>>>>>>
>>>>>>> If you see omap4.dtsi, omap4_pmx_core starts at register address
>>>>>>> 0x4a100040.
>>>>>>>
>>>>>>> So, you need to subtract 0x40 from the offsets defined in mux44xx.h
>>>>>>> for pmx_core registers.
>>>>>>
>>>>>> That was what I was looking for. Thanks!
>>>>>
>>>>> Hi Roger,
>>>>>
>>>>> It has been a while, but I would like to pickup this thread. We have a couple of pandaboards used as test setup. These have an SDIO adapter hooked up to expansion connector A using MMC2. I have attached the patch file (just ignore platform_data stuff). Now on one board it works, but not for the other. I suspect a board issue so listing the two types that we use:
>>>>>
>>>>> PandaBoard rev A2 (dmesg: OMAP4430 ES2.1): works
>>>>> PandaBoardES rev B1 (dmesg: OMAP4460 ES1.1): nope
>>>>>
>>>>> Any hints for me.
>>>>
>>>> Does your PandaboardES have the WLAN chip (U4) mounted? If yes, how do you isolate
>>>> it from your external SDIO adapter?
>>
>> On my 4460 board in front of me U4 is not populated, but U3 is (the TiWi
>> thing).
>>
>>>
>>> OK, just realized that the expansion connector uses different pads for MMC2. However, you still
>>> need to make sure that the other pins (connected to on board WLAN chip) are not muxed as MMC2.
>>
>> I think Luciano added DT patches for on-board WLAN and it uses MMC5 if I
>> am not mistaken(?). Attached are the dmesg logs of the two boards.
>
> I sent 2 patch series to add DT support for the on-board WLAN, but they
> were not applied, since there were some comments that required changes.
> I really don't have the time to revisit them now that I'm not with TI
> anymore, so I'm hoping someone else will pick them up at some point.

I found this one in my email archive:

[PATCH v2 0/4] ARM: dts: add WiLink support to panda and omap4-sdp

Guess that is what you are referring to, right?

Gr. AvS


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