linux-kernel - Re: [PATCH v2 02/10] dt-bindings: hisi: Add Hisilicon HiP05/06/07 Djtag dts bindings

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Date:   Mon, 19 Dec 2016 10:31:26 -0600
From:   Rob Herring <robh@...nel.org>
To:     Anurup M <anurupvasu@...il.com>
Cc:     mark.rutland@....com, will.deacon@....com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, anurup.m@...wei.com,
        zhangshaokun@...ilicon.com, tanxiaojun@...wei.com,
        xuwei5@...ilicon.com, sanil.kumar@...ilicon.com,
        john.garry@...wei.com, gabriele.paoloni@...wei.com,
        shiju.jose@...wei.com, wangkefeng.wang@...wei.com,
        linuxarm@...wei.com, shyju.pv@...wei.com
Subject: Re: [PATCH v2 02/10] dt-bindings: hisi: Add Hisilicon HiP05/06/07
 Djtag dts bindings

On Wed, Dec 07, 2016 at 11:55:19AM -0500, Anurup M wrote:
> From: Tan Xiaojun <tanxiaojun@...wei.com>
> 
> Add Hisilicon HiP05/06/07 Djtag dts bindings for CPU and IO Die
> 
> Signed-off-by: Tan Xiaojun <tanxiaojun@...wei.com>
> Signed-off-by: Anurup M <anurup.m@...wei.com>
> ---
>  .../devicetree/bindings/arm/hisilicon/djtag.txt    | 41 ++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/hisilicon/djtag.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/hisilicon/djtag.txt b/Documentation/devicetree/bindings/arm/hisilicon/djtag.txt
> new file mode 100644
> index 0000000..733498e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/hisilicon/djtag.txt
> @@ -0,0 +1,41 @@
> +The Hisilicon Djtag is an independent component which connects with some other
> +components in the SoC by Debug Bus. The djtag is available in CPU and IO dies
> +in the chip. The djtag controls access to connecting modules of CPU and IO
> +dies.
> +The various connecting components in CPU die (like L3 cache, L3 cache PMU etc.)
> +are accessed by djtag during real time debugging. In IO die there are connecting
> +components like RSA. These components appear as devices atatched to djtag bus.
> +
> +Hisilicon HiP05/06 djtag for CPU and HiP05 IO die
> +Required properties:
> +  - compatible : "hisilicon,hisi-djtag-v1"

These need SoC specific compatible strings. They probably should 
also include cpu or io in the compatible string. I would expect there 
are things like events, triggers, or component connections for debug 
that are SoC specifc.

> +  - reg : Register address and size
> +  - scl-id : The Super Cluster ID for CPU or IO die
> +
> +Hisilicon HiP06 djtag for IO die and HiP07 djtag for CPU and IO die
> +Required properties:
> +  - compatible : "hisilicon,hisi-djtag-v2"

Same here.

> +  - reg : Register address and size
> +  - scl-id : The Super Cluster ID for CPU or IO die
> +
> +Example 1: Djtag for CPU die
> +
> +	/* for Hisilicon HiP05 djtag for CPU Die */
> +	djtag0: djtag@...10000 {
> +		compatible = "hisilicon,hisi-djtag-v1";
> +		reg = <0x0 0x80010000 0x0 0x10000>;
> +		scl-id = <0x02>;
> +
> +		/* All connecting components will appear as child nodes */
> +	};
> +
> +Example 2: Djtag for IO die
> +
> +	/* for Hisilicon HiP05 djtag for IO Die */
> +	djtag1: djtag@...00000 {
> +		compatible = "hisilicon,hisi-djtag-v1";
> +		reg = <0x0 0xd0000000 0x0 0x10000>;
> +		scl-id = <0x01>;
> +
> +		/* All connecting components will appear as child nodes */
> +	};
> -- 
> 2.1.4
>