linux-kernel - RE: [PATCH V3 10/10] arm64: dts: imx8mp: add NoC node

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Date:   Tue, 5 Jul 2022 07:55:49 +0000
From:   Peng Fan <peng.fan@....com>
To:     Georgi Djakov <djakov@...nel.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>, Abel Vesa <abel.vesa@....com>,
        "abailon@...libre.com" <abailon@...libre.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "marex@...x.de" <marex@...x.de>,
        "paul.elder@...asonboard.com" <paul.elder@...asonboard.com>,
        "Markus.Niebel@...tq-group.com" <Markus.Niebel@...tq-group.com>,
        "aford173@...il.com" <aford173@...il.com>,
        "cw00.choi@...sung.com" <cw00.choi@...sung.com>,
        "kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
        "myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "abelvesa@...nel.org" <abelvesa@...nel.org>
Subject: RE: [PATCH V3 10/10] arm64: dts: imx8mp: add NoC node

Hi Georgi,

> Subject: Re: [PATCH V3 10/10] arm64: dts: imx8mp: add NoC node
> 
> 
> Hi Peng,
> 
> On 3.07.22 12:11, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > Add i.MX8MP NoC node to make the interconnect i.MX8MP driver could
> work.
> > Currently dynamic frequency scaling of the i.MX8MP NoC has not been
> > supported, only NoC initial settings are configured by interconnect
> > driver.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >   arch/arm64/boot/dts/freescale/imx8mp.dtsi | 22
> ++++++++++++++++++++++
> >   1 file changed, 22 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > index eb2d516278eb..13a2ee77d3c6 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > @@ -4,6 +4,7 @@
> >    */
> >
> >   #include <dt-bindings/clock/imx8mp-clock.h>
> > +#include <dt-bindings/interconnect/fsl,imx8mp.h>
> 
> It's also possible to drop this line for now and add it in the next patches
> when we add the interconnect consumers. This will allow merging this DT
> patch independently. But it's up to Shawn.
> 
> >   #include <dt-bindings/power/imx8mp-power.h>
> >   #include <dt-bindings/gpio/gpio.h>
> >   #include <dt-bindings/input/input.h> @@ -1019,6 +1020,27 @@ eqos:
> > ethernet@...f0000 {
> >   			};
> >   		};
> >
> > +		noc: interconnect@...00000 {
> > +			compatible = "fsl,imx8mp-noc", "fsl,imx8m-noc",
> "syscon";
> 
> I got the impression that we are dropping the syscon, or not?

I just checked the dt-bindings V1 mail. You are right, syscon
should be dropped.

> 
> > +			reg = <0x32700000 0x100000>;
> > +			clocks = <&clk IMX8MP_CLK_NOC>;
> > +			#interconnect-cells = <1>;
> > +
> > +			operating-points-v2 = <&noc_opp_table>;
> > +
> > +			noc_opp_table: opp-table {
> > +				compatible = "operating-points-v2";
> > +
> > +				opp-200M {
> > +					opp-hz = /bits/ 64 <200000000>;
> > +				};
> > +
> > +				opp-1000M {
> > +					opp-hz = /bits/ 64 <1000000000>;
> > +				};
> > +			};
> > +		};
> > +
> >   		aips4: bus@...00000 {
> >   			compatible = "fsl,aips-bus", "simple-bus";
> >   			reg = <0x32c00000 0x400000>;
> Patches 1-9 look good and I am planning to merge them.

Thanks, Then I only need to repost this single patch for a new version.

Thanks,
Peng.
> 
> Thanks,
> Georgi