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 12:44:39 +0100
From:	Sudeep Holla <sudeep.holla@....com>
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>,
	"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 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.

Regards,
Sudeep
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