linux-kernel - Re: [PATCH v6 6/8] arm64: dts: add SRAM, MHU mailbox and SCPI support on Juno

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Date:	Mon, 03 Aug 2015 12:46:33 +0100
From:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	"arm@...nel.org" <arm@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Olof Johansson <olof@...om.net>,
	Kevin Hilman <khilman@...nel.org>,
	Punit Agrawal <Punit.Agrawal@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v6 6/8] arm64: dts: add SRAM, MHU mailbox and SCPI
 support on Juno

On Mon, 2015-08-03 at 12:23 +0100, Liviu Dudau wrote:
> On Fri, Jul 31, 2015 at 06:43:09PM +0100, Sudeep Holla wrote:
> > This patch adds support for the MHU mailbox peripheral used on Juno by
> > application processors to communicate with remote SCP handling most of
> > the CPU/system power management. It also adds the SRAM reserving the
> > shared memory and SCPI message protocol using that shared memory.
> > 
> > Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> > Acked-by: Liviu Dudau <Liviu.Dudau@....com>
> > Cc: Jon Medhurst (Tixy) <tixy@...aro.org>
> > ---
> >  arch/arm64/boot/dts/arm/juno-base.dtsi | 54 ++++++++++++++++++++++++++++++++++
> >  1 file changed, 54 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
> > index e3ee96036eca..c624208edef6 100644
> > --- a/arch/arm64/boot/dts/arm/juno-base.dtsi
> > +++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
[...]
> > +	scpi {
> > +		compatible = "arm,scpi";
> > +		mboxes = <&mailbox 1>;
> > +		shmem = <&cpu_scp_hpri>;
> > +
> > +		clocks {
> > +			compatible = "arm,scpi-clocks";
> > +
> > +			scpi_dvfs: scpi_clocks@0 {
> > +				compatible = "arm,scpi-dvfs-clocks";
> > +				#clock-cells = <1>;
> > +				clock-indices = <0>, <1>, <2>;
> > +				clock-output-names = "atlclk", "aplclk","gpuclk";
> > +			};
> > +			scpi_clk: scpi_clocks@3 {
> > +				compatible = "arm,scpi-variable-clocks";
> > +				#clock-cells = <1>;
> > +				clock-indices = <3>, <4>;
> > +				clock-output-names = "pxlclk0", "pxlclk1";
> > +			};
> > +		};
> > +	};
> > +
> 
> Sorry for noticing this after the ACK, is there any reason why the scpi node is not inside
> the juno-clocks.dtsi file?

Because SCPI is not just about clocks? Just happens that these first
patches are but there's thermal sensors and other things as well.

-- 
Tixy

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