linux-kernel - Re: [RFC 2/2] ARM: dts: imx6sl: Convert gpc to new bindings

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Date:   Wed, 27 Jun 2018 14:17:32 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "marex@...x.de" <marex@...x.de>,
        Fabio Estevam <fabio.estevam@....com>
CC:     "A.s. Dong" <aisheng.dong@....com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stefan@...er.ch" <stefan@...er.ch>,
        Laurentiu Palcu <laurentiu.palcu@....com>,
        Robert Chiras <robert.chiras@....com>,
        Marco Antonio Franchi <marco.franchi@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Anson Huang <anson.huang@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Mirela Rabulea <mirela.rabulea@....com>
Subject: Re: [RFC 2/2] ARM: dts: imx6sl: Convert gpc to new bindings

On Wed, 2018-06-06 at 11:24 +0200, Lucas Stach wrote:
> Am Dienstag, den 05.06.2018, 20:11 +0300 schrieb Leonard Crestez:
> > With old bindings imx_gpc_onecell_data always sets num_domains to 2 so
> > the DISPMIX domain can't actually be referenced. The pd is still defined
> > and pm core shuts it down as "unused" so display can't work.
> > 
> > Converting to new gpc bindings by adding pgc nodes, also reference
> > referencing the newly-defined &pu_disp domain from &lcdif.
> > 
> > > Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> > 
> > ---
> >  arch/arm/boot/dts/imx6sl.dtsi | 35 ++++++++++++++++++++++++++++++++---
> >  1 file changed, 32 insertions(+), 3 deletions(-)
> > 
> > There are erratas regarding dispmix on 6sl so this might be wrong
> > 
> > diff --git a/arch/arm/boot/dts/imx6sl.dtsi b/arch/arm/boot/dts/imx6sl.dtsi
> > index ab6a7e2e7e8f..9982874fa39e 100644
> > --- a/arch/arm/boot/dts/imx6sl.dtsi
> > +++ b/arch/arm/boot/dts/imx6sl.dtsi
> > @@ -694,14 +694,42 @@
> > >  				reg = <0x020dc000 0x4000>;
> > >  				interrupt-controller;
> > >  				#interrupt-cells = <3>;
> > >  				interrupts = <0 89 IRQ_TYPE_LEVEL_HIGH>;
> > >  				interrupt-parent = <&intc>;
> > > -				pu-supply = <&reg_pu>;
> > > -				clocks = <&clks IMX6SL_CLK_GPU2D_OVG>,
> > > -					 <&clks IMX6SL_CLK_GPU2D_PODF>;
> > > +				clocks = <&clks IMX6SL_CLK_IPG>;
> > > +				clock-names = "ipg";
> > >  				#power-domain-cells = <1>;
> 
> The above power-domain-cells needs to go away when using the new
> binding.

Yes, I fixed this for next version.

However for imx6sl there is a very nasty errata published and I've been
unable to get confirmation of a fix in later versions so it should
probably receive the PGC_DOMAIN_FLAG_NO_PD treatment.

See ERR006287 in https://www.nxp.com/docs/en/errata/IMX6SLCE.pdf

Any comments on the first patch for mxsfb? It's far more interesting.