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

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Message-ID: <55BF61DD.7020003@arm.com>
Date:	Mon, 03 Aug 2015 13:43:09 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	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 03/08/15 12:46, Jon Medhurst (Tixy) wrote:
> 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.
>

I think we cross posted. Anyways I completely agree with you.
However I wanted the clock nodes to be put in juno-clock.dtsi but got
into horrible issue with the way we include headers. It may need some
reworking to get that working.

The idea was:
/* in juno-base.dtsi */
SCPI: scpi {
	compatible = "arm,scpi";
	mboxes = <&mailbox 1>;
	shmem = <&cpu_scp_hpri>;
	...
};
/* in juno-clock.dtsi */
&SCPI {
         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";
                 };
};

I will look at that when I get some time. There are many DTS files
already using something similar.

Regards,
Sudeep
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