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

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Message-ID: <20150803124758.GW20890@e106497-lin.cambridge.arm.com>
Date:	Mon, 3 Aug 2015 13:47:58 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	"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>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	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, Aug 03, 2015 at 12:44:39PM +0100, Sudeep Holla wrote:
> 
> 
> On 03/08/15 12:23, 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
> >> @@ -17,6 +17,18 @@
> >>   		};
> >>   	};
> >>
> >> +	mailbox: mhu@...f0000 {
> >> +		compatible = "arm,mhu", "arm,primecell";
> >> +		reg = <0x0 0x2b1f0000 0x0 0x1000>;
> >> +		interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>,
> >> +			     <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
> >> +		interrupt-names = "mhu_lpri_rx",
> >> +				  "mhu_hpri_rx";
> >> +		#mbox-cells = <1>;
> >> +		clocks = <&soc_refclk100mhz>;
> >> +		clock-names = "apb_pclk";
> >> +	};
> >> +
> >>   	gic: interrupt-controller@...10000 {
> >>   		compatible = "arm,gic-400", "arm,cortex-a15-gic";
> >>   		reg = <0x0 0x2c010000 0 0x1000>,
> >> @@ -44,6 +56,48 @@
> >>   			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>;
> >>   	};
> >>
> >> +	sram: sram@...00000 {
> >> +		compatible = "arm,juno-sram-ns", "mmio-sram";
> >> +		reg = <0x0 0x2e000000 0x0 0x8000>;
> >> +
> >> +		#address-cells = <1>;
> >> +		#size-cells = <1>;
> >> +		ranges = <0 0x0 0x2e000000 0x8000>;
> >> +
> >> +		cpu_scp_lpri: scp-shmem@0 {
> >> +			compatible = "arm,juno-scp-shmem";
> >> +			reg = <0x0 0x200>;
> >> +		};
> >> +
> >> +		cpu_scp_hpri: scp-shmem@200 {
> >> +			compatible = "arm,juno-scp-shmem";
> >> +			reg = <0x200 0x200>;
> >> +		};
> >> +	};
> >> +
> >> +	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?
> >
> 
> Yes, scpi node will have other nodes like sensors/hwmon. So the whole
> scpi node can't sit in juno-clocks. Ideally the clocks belongs to
> juno-clocks, but I got troubles with the way the DTSI are includes and
> could not keep scpi node in base and just update clocks in
> juno-clocks.dtsi. It needs some rework the way include file are used.
> It's in my todo and I will look at that when I get time.

OK, it makes sense. I haven't had a chance to go through Punit's series yet,
I've missed the fact that thermal is going to be attached to this node as well.

Best regards,
Liviu

> 
> Regards,
> Sudeep
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
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