linux-kernel - RE: [PATCH 2/3] arm64: dts: imx8ulp: add scmi firmware node

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Date:   Wed, 8 Dec 2021 13:22:05 +0000
From:   Peng Fan <peng.fan@....com>
To:     Shawn Guo <shawnguo@...nel.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>, Jacky Bai <ping.bai@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        "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>
Subject: RE: [PATCH 2/3] arm64: dts: imx8ulp: add scmi firmware node

Hi Shawn,

> Subject: Re: [PATCH 2/3] arm64: dts: imx8ulp: add scmi firmware node
> 
> On Wed, Nov 17, 2021 at 11:27:39AM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > i.MX8ULP use scmi firmware based power domain and sensor support.
> > So add the firmware node and the sram it uses.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8ulp.dtsi | 35
> > ++++++++++++++++++++++
> >  1 file changed, 35 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
> > b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
> > index fb8714379026..d567ef93f8d8 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
> > @@ -6,6 +6,7 @@
> >  #include <dt-bindings/clock/imx8ulp-clock.h>
> >  #include <dt-bindings/gpio/gpio.h>
> >  #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +#include <dt-bindings/power/imx8ulp-power.h>
> >
> >  #include "imx8ulp-pinfunc.h"
> >
> > @@ -102,6 +103,40 @@ sosc: clock-sosc {
> >  		#clock-cells = <0>;
> >  	};
> >
> > +	sram@...1f000 {
> > +		compatible = "mmio-sram";
> > +		reg = <0x0 0x2201f000 0x0 0x1000>;
> > +
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		ranges = <0 0x0 0x2201f000 0x1000>;
> > +
> > +		scmi_buf: scmi_buf@0 {
> 
> Hyphen is more recommended than underscore for node name.  

Just send out v2 to address this issue.

Or just
> follow the naming in arm,scmi.yaml example?

No need to follow its name there, it support many protocols
and need different shmem for performance and others.

Thanks,
Peng.


> 
> Shawn
> 
> > +			compatible = "arm,scmi-shmem";
> > +			reg = <0x0 0x400>;
> > +		};
> > +	};
> > +
> > +	firmware {
> > +		scmi {
> > +			compatible = "arm,scmi-smc";
> > +			arm,smc-id = <0xc20000fe>;
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			shmem = <&scmi_buf>;
> > +
> > +			scmi_devpd: protocol@11 {
> > +				reg = <0x11>;
> > +				#power-domain-cells = <1>;
> > +			};
> > +
> > +			scmi_sensor: protocol@15 {
> > +				reg = <0x15>;
> > +				#thermal-sensor-cells = <0>;
> > +			};
> > +		};
> > +	};
> > +
> >  	soc@0 {
> >  		compatible = "simple-bus";
> >  		#address-cells = <1>;
> > --
> > 2.25.1
> >