linux-kernel - Re: [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for Qualcomm hwmutex

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Date:	Thu, 12 Mar 2015 09:51:37 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Kumar Gala <galak@...eaurora.org>, Suman Anna <s-anna@...com>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Jeffrey Hugo <jhugo@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for
 Qualcomm hwmutex

On Fri, Feb 27, 2015 at 10:30:16PM +0000, Bjorn Andersson wrote:
> Add binding documentation for the Qualcomm Hardware Mutex.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
> 
> I think the conclusion on the dt binding discussion for hwspinlocks was that
> we're down to having the #hwlock-cells intact. So this version includes that,
> but non of the other previously discussed properties.
> 
> Changes since v5:
> - Extracted the dt binding documentation into a separate patch
> - Moved the driver to consume a syscon

I'm a little confused here. Why are we now using a syscon? I thought the
set of registers for the block was well-defined.

If there's a link to some previous discussion on that point, it would be
helpful.

Mark.

> - Dropped previously suggested generic hwlock dt bindings
> 
>  .../devicetree/bindings/hwlock/qcom-hwspinlock.txt | 39 ++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
> 
> diff --git a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
> new file mode 100644
> index 0000000..28ade7d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
> @@ -0,0 +1,39 @@
> +Qualcomm Hardware Mutex Block:
> +
> +The hardware block provides mutexes utilized between different processors on
> +the SoC as part of the communication protocol used by these processors.
> +
> +- compatible:
> +	Usage: required
> +	Value type: <string>
> +	Definition: must be one of:
> +		    "qcom,sfpb-mutex",
> +		    "qcom,tcsr-mutex"
> +
> +- syscon:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: one cell containing:
> +		    syscon phandle
> +		    offset of the hwmutex block within the syscon
> +		    stride of the hwmutex registers
> +
> +- #hwlock-cells:
> +	Usage: required
> +	Value type: <u32>
> +	Definition: must be 1, the specified cell represent the lock id
> +		    (hwlock standard property, see hwlock.txt)
> +
> +Example:
> +
> +        tcsr: syscon@...00000 {
> +		compatible = "qcom,tcsr-msm8974", "syscon";
> +		reg = <0xfd484000 0x2000>;
> +	};
> +
> +	hwlock@...84000 {
> +		compatible = "qcom,tcsr-mutex";
> +		syscon = <&tcsr 0 0x80>;
> +
> +		#hwlock-cells = <1>;
> +	};
> -- 
> 1.8.2.2
> 
> 
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