[PATCH] ARM: dts: exynos4: Use drive strength 3 for SD pins
kgene.kim at samsung.com
Wed Nov 21 07:10:42 EST 2012
Tomasz Figa wrote:
> Hi Kgene,
> On Tuesday 20 of November 2012 20:10:25 Kukjin Kim wrote:
> > Tomasz Figa wrote:
> > > Hi Kgene,
> > >
> > > On Tuesday 20 of November 2012 18:18:44 Kukjin Kim wrote:
> > > > Tomasz Figa wrote:
> > > > > This patch modifies pin control groups of SD pins on Exynos4210
> > > > > and
> > > > > Exynos4x12 to use drive strength 3, which corresponds to
> > > > > S5P_GPIO_DRVSTR_LV4 in legacy non-DT code.
> > > >
> > > > Well, the value of drive strength depends on board not SoC. So if
> > > > required, it should be moved to board DT stuff.
> > >
> > > Yes, I fully agree.
> > >
> > > I've been thinking whether to change the defaults or just override
> > > them
> > > for Origen, but I came to a conclusion that 3 (LV4) was the default in
> > > non-DT code, so it probably should be also the default in DT variant.
> > OK.
> > > > BTW, we can use the value as a default...I need to think about that
> > > > again for exynos4210 and 4x12.
> > >
> > > I wonder which default value is more appropriate, 0 or 3?
> > In this case, yes, '3' is more useful...so can you re-submit this patch
> > with editing commit?
> I can resubmit this patch, but I'm not sure what you expect me to edit.
> Could you explain?
Hmm, I mean the commit message needs explanation is why to use '3' as a
default value is more useful. OK, if you don't mind, I will edit it when I
> If possible, it would be nice to get this included in 3.8 as it's required
> for Origen board to boot with device tree.
OK, as we discussed, I agree with this.
Will apply, thanks.
Kukjin Kim <kgene.kim at samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.
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