linux-kernel - Re: [RFC PATCH 4/4] ARM: dts: k2hk-evm: add pm domains for net, qmss and knav

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Message-ID: <7hd2aj9vzh.fsf@deeprootsystems.com>
Date:	Thu, 25 Sep 2014 15:27:30 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	<santosh.shilimkar@...com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	<linux-pm@...r.kernel.org>, <ben.dooks@...ethink.co.uk>,
	<laurent.pinchart@...asonboard.com>, <grant.likely@...retlab.ca>,
	<ulf.hansson@...aro.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 4/4] ARM: dts: k2hk-evm: add pm domains for net, qmss and knav_dmas

Grygorii Strashko <grygorii.strashko@...com> writes:

> Add Keystone PM domains nodes for NetCP, NetCPx, QMSS, KNAV-DMA
> devices.
>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  arch/arm/boot/dts/k2hk-evm.dts | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>
> diff --git a/arch/arm/boot/dts/k2hk-evm.dts b/arch/arm/boot/dts/k2hk-evm.dts
> index 91371f7..a7b468c 100644
> --- a/arch/arm/boot/dts/k2hk-evm.dts
> +++ b/arch/arm/boot/dts/k2hk-evm.dts
> @@ -58,6 +58,13 @@
>  				clock-output-names = "refclk-ddr3b";
>  			};
>  		};
> +
> +		qmss_domain: qmss_pm_controller {
> +			compatible = "ti,keystone-gpc";
> +			clocks = <&chipclk13>;
> +			#power-domain-cells = <0>;
> +		};

Hmm, I'm still a bit confused by what you're attempting to do here.
Unless I'm missing someting, clocks are properties of the device, not
the pm-domain...

>  		qmss: qmss@...0000 {
>  			compatible = "ti,keystone-navigator-qmss";
>  			dma-coherent;
> @@ -65,6 +72,8 @@
>  			#size-cells = <1>;
>  			clocks = <&chipclk13>;
>  			ranges;
> +			power-domains = <&qmss_domain>;

...  Also, each of the pm domains is duplicating the list of clocks from
the device node, so I'm not sure what this is accomplishing.

Why not just have a single, more generic power domain that gets the list
of clocks from the device node.

Kevin
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