linux-kernel - Re: [PATCH] ARM: dts: exynos5420: Add maudio power domain

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Date:	Mon, 09 Feb 2015 13:58:13 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH] ARM: dts: exynos5420: Add maudio power domain

Hello Krzysztof,

On 02/09/2015 01:41 PM, Krzysztof Kozlowski wrote:
> Add maudio power domain to Exynos 5420 DTSI file so its state could be
> tracked. This actually won't power down this domain because the pl330
> dmaengine driver (for adma channel) uses IRQ safe runtime PM. Thus the
> patch should not introduce any functional change except of visibility of
> this domain to the system.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---

Your patch looks good to me, I just have two small comments below. With
those changes, feel free to add:

Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>

>  arch/arm/boot/dts/exynos5420.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
> index 6d38f8bfd0e6..2e99a39f7250 100644
> --- a/arch/arm/boot/dts/exynos5420.dtsi
> +++ b/arch/arm/boot/dts/exynos5420.dtsi
> @@ -270,6 +270,11 @@
>  		reg = <0x10044120 0x20>;
>  	};
>  
> +	mau_pd: power-domain@...440E0 {
> +		compatible = "samsung,exynos4210-pd";
> +		reg = <0x100440E0 0x20>;

You also need to add #power-domain-cells = <0> here since "power-domain-cells"
is a required property now that the Exynos PD code has been converted to use
the generic power domains lookup.

> +	};
> +
>  	pinctrl_0: pinctrl@...00000 {
>  		compatible = "samsung,exynos5420-pinctrl";
>  		reg = <0x13400000 0x1000>;
> @@ -328,6 +333,7 @@
>  			#dma-cells = <1>;
>  			#dma-channels = <6>;
>  			#dma-requests = <16>;
> +			samsung,power-domain = <&mau_pd>;

Same here. Even though "samsung,power-domain" is kept as backward compatible,
"power-domains" should be used instead. In fact Marek sent a patch [0] to get
rid of all the current "samsung,power-domain" properties so it would be good
if you can base on top of that one.

Best regards,
Javier

[0]: http://www.spinics.net/lists/linux-samsung-soc/msg40584.html
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