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

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Date:	Tue, 1 Oct 2013 12:53:53 +0200
From:	"Arend van Spriel" <arend@...adcom.com>
To:	"Roger Quadros" <rogerq@...com>
cc:	"Tony Lindgren" <tony@...mide.com>, linux-omap@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Luciano Coelho" <coelho@...com>
Subject: Re: using mmc2 on panda [was: Regression 3.11-rc1: omap4panda:
 no usb and consequently no ethernet]

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.

Regards,
Arend


View attachment "dmesg-4430.txt" of type "text/plain" (21754 bytes)

View attachment "dmesg-4460.txt" of type "text/plain" (21453 bytes)