linux-kernel - Re: [RFC PATCH 2/4] ARM: keystone: pm: switch to use generic pm domains

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Date:	Thu, 25 Sep 2014 15:23:10 -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 2/4] ARM: keystone: pm: switch to use generic pm domains

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

> This patch switches Keystone 2 PM code to use Generic PM domains
> instead of PM  clock domains because of the lack of DT support
> for the last.
>
> Keystone 2 PM domain should be specified per device for which
> Runtime PM has to be enabled and handles the list of functional clocks
> to enable/disable device.
>
> Example:
>  qmss_domain: qmss_pm_controller {
> 	compatible = "ti,keystone-pm-controller";
> 	clocks = <&chipclk13>;
> 	#power-domain-cells = <0>;
>  };
>
>  qmss: qmss@...0000 {
> 	compatible = "ti,keystone-navigator-qmss";
> 	...
> 	power-domains = <&qmss_domain>;
>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

[...]

> +static int keystone_pm_domain_power_off(struct generic_pm_domain *genpd)
> +{
> +	int ret;
> +	struct keystone_domain *dm = container_of(genpd,
> +						  struct keystone_domain,
> +						  base);
> +
> +	/* Enable reset clocks for all devices in the PU domain */

This says enable clocks...

> +	ret = pm_clk_suspend(dm->dev);

...but this calls clk_disable().

> +	if (ret)
> +		dev_err(dm->dev, "can't turn off clocks %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int keystone_pm_domain_power_on(struct generic_pm_domain *genpd)
> +{
> +	int ret;
> +	struct keystone_domain *dm = container_of(genpd,
> +						  struct keystone_domain,
> +						  base);
> +
> +	/* Disable reset clocks for all devices in the PU domain */

And this says disable clocks...

> +	ret = pm_clk_resume(dm->dev);

...but this calls clk_enable().

-ECONFUSED.

Kevin
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