linux-kernel - Re: [PATCH] ARM: EXYNOS: Update defconfig for Arndale and Origen board

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Date:	Wed, 29 May 2013 18:33:01 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Tushar Behera' <tushar.behera@...aro.org>,
	'Olof Johansson' <olof@...om.net>
Cc:	'Arnd Bergmann' <arnd@...db.de>,
	'Kevin Hilman' <khilman@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Doug Anderson' <dianders@...omium.org>,
	'Patch Tracking' <patches@...aro.org>,
	Jingoo Han <jg1.han@...sung.com>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Vivek Gautam' <gautam.vivek@...sung.com>
Subject: Re: [PATCH] ARM: EXYNOS: Update defconfig for Arndale and Origen board

On Wednesday, May 29, 2013 5:51 PM, Tushar Behera:
> On 05/29/2013 11:01 AM, Olof Johansson wrote:
> > On Tue, May 28, 2013 at 8:59 PM, Tushar Behera <tushar.behera@...aro.org> wrote:
> >
> >> The patches are at [1].
> >
> > FWIW, a cgit/gitweb link is easier to follow when you're reading an
> > email. Anyway, found the patches.
> >
> >> There are a total of 6 patches on top of
> >> v3.10-rc3. 3 of them (a, b, d) are queued for 3.10-rc4 and another patch
> >> (c) is just a defconfig hack to get Arndale booting. Remaining 2 patches
> >> (e, f) are required to reset the hub during EHCI initialization.
> >
> > Huh, I thought you said that (c) wasn't needed when I posted the
> > defconfig update. It'd be nice to see the code fixed to handle this
> > case instead of Linaro carrying a patch like this though. I.e. make it
> > able to deselect the uart, or make it tied to DEBUG_LL like on other
> > platforms instead of having a separate config for this.
> >
> 
> It would be good to free up the dependency on the correct UART port for
> the board to boot. Without that, there would always be boards that don't
> boot with default mainline defconfig file even though all other
> components are in place.
> 
> >> a. ARM: exynos: defconfig update
> >> b. ARM: EXYNOS: Update defconfig for Arndale and Origen board
> >> c. [TEMP] ARM: EXYNOS: Set low-level UART port to 2
> >> d. ARM: dts: Enabling samsung-usb2phy driver for exynos5250
> >> e. usb: ehci-s5p: add the HSIC port initialization
> >> f. ARM: dts: Add USB gpio entries for Arndale board
> >>
> >> I am not sure whether such kind of board-specific patches (e, f) are
> >> appreciated in the drivers. But that is all we need to get USB and
> >> Ethernet to work on v3.10-rc3 kernel.
> >
> > I've come across a similar situation with wifi reset sequence on the
> > chromebook. On the product kernel we added some code to the board file
> > to deal with it, but if we keep doing that things will grow out of
> > hand.
> >
> > I don't know if it'll be unpopular, but I think it's time to start a
> > drivers/platform/arm for these kind of things, and have those drivers
> > probe on the system compatible value, similar to how x86 does it (with
> > DMI tables). At least that's my plan for approaching the wifi
> > reset/power-on sequence on the Chromebook. I hope to have patches in
> > not all that long...
> >
> > Likewise, the hub reset/enable code doesn't have to go with the USB
> > driver, right? I.e. if you cycle reset/enable on the hub after the
> > host and phy is configured, you'll still have a working setup?
> >
> 
> Right, hub reset/enable code need not be tied up with USB driver. As per
> your suggestion regarding drivers/platform/arm, I implemented an Arndale
> specific driver [2] in drivers/platform/arm and verified USB and
> ethernet to be working.

CC'ed Thomas Abraham, Vivek Gautam

I think so.

I looked at Arndale board Schematics.
'Hub chip' on Arndale board needs hub reset/enable code.
'HUB_RESET' and 'HUB_CONNECT' pins are used to reset 'Hub chip'
on Arndale board, not Exynos EHCI controller. So, Exynos EHCI driver
does not need to consider this hub reset/enable code.

If there is a driver for this 'Hub chip', 'Hub chip' driver maybe
consider this.

However, Olof Johansson mentioned, 'drivers/platform/arm/board_arndale.c'
would be a good alternative.

> 
> [2]
> https://git.linaro.org/gitweb?p=landing-
> teams/working/samsung/kernel.git;a=shortlog;h=refs/heads/upstream/arndale-usb-2

It looks good.

Best regards,
Jingoo Han

> 
> >
> > -Olof
> >
> 
> 
> --
> Tushar Behera
> --
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