linux-kernel - Re: [PATCH 1/2] dt-bindings: Documentation for qcom,llcc

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Message-ID: <20180201104808.rxgqcrlsevtotq55@lakrids.cambridge.arm.com>
Date:   Thu, 1 Feb 2018 10:48:08 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Channagoud Kadabi <ckadabi@...eaurora.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-arm@...ts.infradead.org,
        linux-kernel@...r.kernel.org, tsoni@...eaurora.org,
        sboyd@...eaurora.org, kyan@...eaurora.org
Subject: Re: [PATCH 1/2] dt-bindings: Documentation for qcom,llcc

On Thu, Jan 25, 2018 at 03:55:12PM -0800, Channagoud Kadabi wrote:
> Documentation for last level cache controller device tree bindings,
> client bindings usage examples.
> 
> Signed-off-by: Channagoud Kadabi <ckadabi@...eaurora.org>
> ---
>  .../devicetree/bindings/arm/msm/qcom,llcc.txt      | 93 ++++++++++++++++++++++
>  1 file changed, 93 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
> 
> +Example:
> +
> +	qcom,system-cache@...0000 {
> +		compatible = "qcom,llcc-core", "syscon", "simple-mfd";
> +		reg = <0x1300000 0x50000>;
> +		reg-names = "llcc_base";
> +
> +		llcc: qcom,sdm845-llcc {
> +			compatible = "qcom,sdm845-llcc";
> +			#cache-cells = <1>;
> +			max-slices = <32>;
> +		};
> +
> +		qcom,llcc-ecc {
> +			compatible = "qcom,llcc-ecc";
> +		};
> +
> +		qcom,llcc-amon {
> +			compatible = "qcom,llcc-amon";
> +			qcom,fg-cnt = <0x7>;
> +		};
> +
> +	};

The "qcom,llcc-ecc" and "qcom,llcc-amon" bindings doesn't seem to be
used by the driver in patch 2, and it's not clear how they are intended
to be used, so I think they should go from the binding for now.

I don't think you need syscon and simple-mfd, and I think you can
simplify the binding to a single node like:

	qcom,system-cache@...0000 {
		compatible = "qcom,sdm845-llcc";
		reg = <0x1300000 0x50000>;
		#cache-slice-cells = <1>;
		max-slices = <32>;
	}

If ECC and AMON are option features, we can always add boolean
properties for those later, e.g. "has-ecc".

Thanks,
Mark.