linux-kernel - Re: [PATCH v5 1/8] Documentation: add DT binding for ARM System Control and Power Interface(SCPI) protocol

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Message-ID: <55B757DC.7020509@arm.com>
Date:	Tue, 28 Jul 2015 11:22:20 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Mark Rutland <Mark.Rutland@....com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Punit Agrawal <Punit.Agrawal@....com>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Kevin Hilman <khilman@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Jassi Brar <jassisinghbrar@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 1/8] Documentation: add DT binding for ARM System Control
 and Power Interface(SCPI) protocol

Hi Mark,

On 23/07/15 12:10, Sudeep Holla wrote:
> This patch adds devicetree binding for System Control and Power
> Interface (SCPI) Message Protocol used between the Application Cores(AP)
> and the System Control Processor(SCP). The MHU peripheral provides a
> mechanism for inter-processor communication between SCP's M3 processor
> and AP.
>
> SCP offers control and management of the core/cluster power states,
> various power domain DVFS including the core/cluster, certain system
> clocks configuration, thermal sensors and many others.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>

Can you review or provide ACK if this looks good ?

[..]

> diff --git a/Documentation/devicetree/bindings/arm/arm,scpi.txt b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> new file mode 100644
> index 000000000000..e21cce646561
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> @@ -0,0 +1,151 @@

[..]

> +cpu@0 {
> +	...
> +	reg = <0 0>;
> +	clocks = <&scpi_dvfs 0>;
> +};
> +
> +hdlcd@...60000 {
> +	...
> +	reg = <0 0x7ff60000 0 0x1000>;
> +	clocks = <&scpi_clk 4>;
> +};
> +
> +In the above example, the #clock-cells is set to 1 as required.
> +scpi_dvfs has 3 output clocks namely: vbig, vlittle and vgpu with 0, 1

I noticed this just after sending it out, fixed now to match the names
in the example correctly.

Regards,
Sudeep
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