linux-kernel - Re: [PATCH v2 1/4] dt-bindings: memory-controllers: Add Exynos5422 DMC interrupts description

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Date:   Tue, 1 Oct 2019 15:18:07 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Lukasz Luba <l.luba@...tner.samsung.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, b.zolnierkie@...sung.com,
        kgene@...nel.org, mark.rutland@....com, cw00.choi@...sung.com,
        kyungmin.park@...sung.com, m.szyprowski@...sung.com,
        s.nawrocki@...sung.com, myungjoo.ham@...sung.com,
        robh+dt@...nel.org, willy.mh.wolff.ml@...il.com
Subject: Re: [PATCH v2 1/4] dt-bindings: memory-controllers: Add Exynos5422
 DMC interrupts description

On Tue, Oct 01, 2019 at 02:54:33PM +0200, Lukasz Luba wrote:
> Add description for optional interrupt lines. It provides a new operation
> mode, which uses internal performance counters interrupt when overflow.
> This is more reliable than using default polling mode implemented in
> devfreq.
> 
> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
> ---
>  .../bindings/memory-controllers/exynos5422-dmc.txt     | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt b/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
> index 02aeb3b5a820..afc38aea6b1c 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
> +++ b/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
> @@ -31,6 +31,13 @@ Required properties for DMC device for Exynos5422:
>  	The register offsets are in the driver code and specyfic for this SoC
>  	type.
>  
> +Optional properties for DMC device for Exynos5422:
> +- interrupt-parent : The parent interrupt controller.
> +- interrupts : Contains the IRQ line numbers for the DMC internal performance
> +  event counters. Align with specification of the interrupt line(s) in the
> +  interrupt-parent controller.
> +- interrupt-names : List of IRQ names.

Since the names are important (not the order) they are part of the
bindings and they must be listed here.

Best regards,
Krzysztof


> +
>  Example:
>  
>  	ppmu_dmc0_0: ppmu@...00000 {
> @@ -70,4 +77,7 @@ Example:
>  		device-handle = <&samsung_K3QF2F20DB>;
>  		vdd-supply = <&buck1_reg>;
>  		samsung,syscon-clk = <&clock>;
> +		interrupt-parent = <&combiner>;
> +		interrupts = <16 0>, <16 1>;
> +		interrupt-names = "drex_0", "drex_1";
>  	};
> -- 
> 2.17.1
>