Re: [PATCH 8/8] ARM: dts: imx7d: add node for PXP

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Fri, Jan 06, 2023 at 03:36:21PM +0100, Michael Tretter wrote:
> On Fri, 06 Jan 2023 14:36:41 +0200, Laurent Pinchart wrote:
> > Hi Michael,
> > 
> > Thank you for the patch.
> > 
> > On Thu, Jan 05, 2023 at 02:47:29PM +0100, Michael Tretter wrote:
> > > The i.MX7d contains a Pixel Pipeline in version 3.0. Add the device tree
> > > node to make it available.
> > > 
> > > Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
> > > ---
> > >  arch/arm/boot/dts/imx7d.dtsi | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > > 
> > > diff --git a/arch/arm/boot/dts/imx7d.dtsi b/arch/arm/boot/dts/imx7d.dtsi
> > > index 7ceb7c09f7ad..728cc9413a7c 100644
> > > --- a/arch/arm/boot/dts/imx7d.dtsi
> > > +++ b/arch/arm/boot/dts/imx7d.dtsi
> > > @@ -165,6 +165,15 @@ pcie_phy: pcie-phy@306d0000 {
> > >  		  reg = <0x306d0000 0x10000>;
> > >  		  status = "disabled";
> > >  	};
> > > +
> > > +	pxp: pxp@30700000 {
> > > +		compatible = "fsl,imx7d-pxp";
> > 
> > Hmmm... The i.MX7S also has a PXP that seems compatible. I thus wonder
> > if we shouldn't move this node to imx7s.dtsi.
> 
> The i.MX7S has a PXP at the same address, but the architecture in the
> reference manual (Figure 13-71. PXP Architecture, p. 3797) looks slightly
> different wrt. the location of the multiplexers. The reference manual is also
> conspicuously lacking documentation of the DATA_PATH_CTRL0 register.
> 
> I wouldn't risk adding the node to the imx7s.dtsi and would rather keep the
> option to add a different compatible for the i.MX7S to be able to handle the
> difference.

OK, fine with me.

> > > +		reg = <0x30700000 0x10000>;
> > > +		interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
> > > +			<GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
> > 
> > Nitpicking, alignment ?
> > 
> > > +		clocks = <&clks IMX7D_PXP_CLK>;
> > > +		clock-names = "axi";
> > > +	};
> > >  };
> > >  
> > >  &aips3 {

-- 
Regards,

Laurent Pinchart