linux-kernel - Re: [PATCH] arm64: dts: imx8m: add syscon node for display_blk

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Date:   Mon, 1 Nov 2021 23:22:21 -0500
From:   Adam Ford <aford173@...il.com>
To:     Tommaso Merciai <tomm.merciai@...il.com>
Cc:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        Peng Fan <peng.fan@....com>, Alice Guo <alice.guo@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH] arm64: dts: imx8m: add syscon node for display_blk_ctrl
 module regs

On Mon, Nov 1, 2021 at 5:58 PM Tommaso Merciai <tomm.merciai@...il.com> wrote:
>
> On Mon, Nov 01, 2021 at 11:35:49PM +0100, Ahmad Fatoum wrote:
> > Hello Tommaso,
> >
> > On 01.11.21 23:28, Tommaso Merciai wrote:
> > > Add system controller node for registers of module Display Block Control
> > > (DISPLAY_BLK_CTRL, base address: 0x32e28000).
> > > The DISPLAY_BLK_CTRL module contains general purpose registers (GPRs),
> > > which control varied features of the associated peripherals.
> > > Reference: IMX8MMRM Rev. 3, 11/2020, p 3897
> > > ---
> > >  arch/arm64/boot/dts/freescale/imx8mm.dtsi | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> > > index 2f632e8ca388..3e496b457e1a 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> > > @@ -961,6 +961,11 @@ aips4: bus@...00000 {
> > >                     #size-cells = <1>;
> > >                     ranges = <0x32c00000 0x32c00000 0x400000>;
> > >
> > > +                   dispmix_gpr: display-gpr@...28000 {
> > > +                           compatible = "fsl, imx8mm-iomuxc-gpr", "syscon";
> >
> > Please read vendor patches before submitting them. The space
> > is out-of-place in the compatible and the compatible is wrong:
> > This doesn't look like a i.MX8MM pin controller.
> >
> > Cheers,
> > Ahmad
>
>   Hi Ahmad,
>   Thanks for your review. Do you think this is correct?
>
>   compatible = "fsl,imx8mm-dispmix-gpr", "syscon";
>
>   Let me know.

There was already a driver created for the blk-ctrl stuff and it has a
device tree binding at 32e28000.  It's tied into the power-domain
system, so if you want to enable the csi, dsi, or lcd, etc. you can
just reference the blt-ctrl power domain index, and it enables the
device's gpc power domain and takes the corresponding device out of
reset.

adam
>
>   Thanks,
>   Tommaso
>
> >
> > > +                           reg = <0x32e28000 0x100>;
> > > +                   };
> > > +
> > >                     usbotg1: usb@...40000 {
> > >                             compatible = "fsl,imx8mm-usb", "fsl,imx7d-usb";
> > >                             reg = <0x32e40000 0x200>;
> > >
> >
> >
> > --
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