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

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Message-ID: <1380710891.5049.1.camel@porter.coelho.fi>
Date:	Wed, 02 Oct 2013 13:48:11 +0300
From:	Luca Coelho <luca@...lho.fi>
To:	Arend van Spriel <arend@...adcom.com>
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 Wed, 2013-10-02 at 12:20 +0200, Arend van Spriel wrote:
> 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?

Yes, that one and also this (which implements DT in the driver itself):

[PATCH v4 0/8] wilink: add device tree support
http://mid.gmane.org/1375189476-21557-1-git-send-email-coelho@ti.com

--
Luca.

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