linux-kernel - RE: [PATCH] Document: dt: binding: imx: Fix PAD_CTL_DSE

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Date:   Wed, 6 Mar 2019 13:36:42 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     BOUGH CHEN <haibo.chen@....com>, Stefan Agner <stefan@...er.ch>
CC:     Christina Quast <cquast@...overdisplays.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] Document: dt: binding: imx: Fix PAD_CTL_DSE_X*

[...]

> > > Btw, I saw that imx7d-sdb.dts (and probably other i.MX 7 boards too)
> > > use three different settings for usdhc pinctrl: 0x59, 0x5a and 0x5b
> > > (for default, 100MHz and 200MHz respectively). One would expect that
> > > higher frequency use higher driver strength (and this is the case for i.MX 6).
> > > But with this new/corrected pad values this means we use x4, x2 and
> > > x6 for default, 100MHz and 200MHz respectively. This hardly seems right..?
> > > Probably needs fixing too?
> > >
> >
> > Yes, that's true.
> > Especially 100Mhz setting should be updated.
> >
> > Haibo,
> > Can you please help double check if X2 for 50Mhz and X4 for 100Mhz can
> > work stably on MX7D SDB?
> > If yes, we'd like to update the pad setting according to new RM version.
> >
> 
> X2 for high speed and x4 for ddr50/ddr52 can work stable on MX7D SDB.
> I think all the 7D related dts need to fix this. Not sure whether 7S need this fix,
> can you confirm?
> 

Yes, please make a patch to test board maintainer.

Regards
Dong Aisheng

> Best Regards
> Haibo Chen