Re: [PATCH] arm64: dts: imx8m: add syscon node for display_blk_ctrl module regs

From: Tommaso Merciai
Date: Tue Nov 02 2021 - 07:59:54 EST


On Mon, Nov 01, 2021 at 11:22:21PM -0500, Adam Ford wrote:
> On Mon, Nov 1, 2021 at 5:58 PM Tommaso Merciai <tomm.merciai@xxxxxxxxx> 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@32c00000 {
> > > > #size-cells = <1>;
> > > > ranges = <0x32c00000 0x32c00000 0x400000>;
> > > >
> > > > + dispmix_gpr: display-gpr@32e28000 {
> > > > + 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.

Hi Adam,
You mean using the gpcv2.c driver?

drivers/soc/imx/gpcv2.c

With the following node, to put out of reset eLCDIF and mipi_dsi:

gpc: gpc@303a0000 {
compatible = "fsl,imx8mm-gpc";
reg = <0x303a0000 0x10000>;
interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
interrupt-parent = <&gic>;
interrupt-controller;
#interrupt-cells = <3>;

pgc {

#address-cells = <1>;
#size-cells = <0>;
pgc_mipi: power-domain@0 {
#power-domain-cells = <0>;
reg = <IMX8M_POWER_DOMAIN_MIPI>;
};

pgc_disp: power-domain@7 {
#power-domain-cells = <0>;
reg = <IMX8M_POWER_DOMAIN_DISP>;
};
};
};

Let me know.

Thanks,
Tommaso

>
> adam
> >
> > Thanks,
> > Tommaso
> >
> > >
> > > > + reg = <0x32e28000 0x100>;
> > > > + };
> > > > +
> > > > usbotg1: usb@32e40000 {
> > > > compatible = "fsl,imx8mm-usb", "fsl,imx7d-usb";
> > > > reg = <0x32e40000 0x200>;
> > > >
> > >
> > >
> > > --
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