linux-kernel - Re: [PATCH v2 2/3] ARM: keystone: pm: switch to use generic pm domains

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Message-ID: <5446A065.9050308@gmail.com>
Date:	Tue, 21 Oct 2014 11:05:25 -0700
From:	Santosh Shilimkar <santosh.shilimkar@...il.com>
To:	Grygorii Strashko <grygorii.strashko@...com>, ssantosh@...nel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, khilman@...aro.org
CC:	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-pm@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	grant.likely@...retlab.ca, ulf.hansson@...aro.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/3] ARM: keystone: pm: switch to use generic pm domains

On 10/20/2014 05:56 AM, Grygorii Strashko wrote:
> 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.
>
> Reviewed-by: Kevin Hilman <khilman@...aro.org>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>   .../bindings/power/ti,keystone-powerdomain.txt     |  31 ++++++
>   arch/arm/mach-keystone/Kconfig                     |   1 +
>   arch/arm/mach-keystone/pm_domain.c                 | 112 ++++++++++++++-------
>   3 files changed, 107 insertions(+), 37 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/power/ti,keystone-powerdomain.txt
>
> diff --git a/Documentation/devicetree/bindings/power/ti,keystone-powerdomain.txt b/Documentation/devicetree/bindings/power/ti,keystone-powerdomain.txt
> new file mode 100644
> index 0000000..4bbf2aa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/ti,keystone-powerdomain.txt
> @@ -0,0 +1,31 @@
> +* TI Keystone 2 Generic PM Controller
> +
> +The TI Keystone 2 Generic PM Controller is responsible for Clock gating
> +for each controlled IP module.
> +
> +Required properties:
> +- compatible: Should be "ti,keystone-powerdomain"
> +- #power-domain-cells: Should be 0, see below:
> +
> +The gpc node is a power-controller as documented by the generic power domain
You renamed gpc but missed to fix the comment ? Pls update it.

> +bindings in Documentation/devicetree/bindings/power/power_domain.txt.
> +
> +Example:
> +
> +	pm_controller: pm-controller {
> +		compatible = "ti,keystone-powerdomain";
> +		#power-domain-cells = <0>;
> +	};
> +
> +	netcp: netcp@...0000 {
> +		reg = <0x2620110 0x8>;
> +		reg-names = "efuse";
> +		...
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +		power-domains = <&pm_controller>;
> +
> +		clocks = <&clkpa>, <&clkcpgmac>, <&chipclk12>;
> +		dma-coherent;
> +	}
> diff --git a/arch/arm/mach-keystone/Kconfig b/arch/arm/mach-keystone/Kconfig
> index 98a156a..de43107 100644
> --- a/arch/arm/mach-keystone/Kconfig
> +++ b/arch/arm/mach-keystone/Kconfig
> @@ -9,6 +9,7 @@ config ARCH_KEYSTONE
>   	select COMMON_CLK_KEYSTONE
>   	select ARCH_SUPPORTS_BIG_ENDIAN
>   	select ZONE_DMA if ARM_LPAE
> +	select PM_GENERIC_DOMAINS if PM
>   	help
>   	  Support for boards based on the Texas Instruments Keystone family of
>   	  SoCs.
> diff --git a/arch/arm/mach-keystone/pm_domain.c b/arch/arm/mach-keystone/pm_domain.c
> index ca79dda..d58759d 100644
> --- a/arch/arm/mach-keystone/pm_domain.c
> +++ b/arch/arm/mach-keystone/pm_domain.c
> @@ -12,69 +12,107 @@
>    * version 2, as published by the Free Software Foundation.
>    */
>
> +#include <linux/clk.h>
>   #include <linux/init.h>
> -#include <linux/pm_runtime.h>
>   #include <linux/pm_clock.h>
> +#include <linux/pm_domain.h>
>   #include <linux/platform_device.h>
> -#include <linux/clk-provider.h>
>   #include <linux/of.h>
>
> -#ifdef CONFIG_PM_RUNTIME
> -static int keystone_pm_runtime_suspend(struct device *dev)
> +#ifdef CONFIG_PM_GENERIC_DOMAINS
> +
> +struct keystone_domain {
> +	struct generic_pm_domain genpd;
> +	struct device	*dev;
> +};
> +
> +void keystone_pm_domain_attach_dev(struct device *dev)
>   {
> +	struct clk *clk;
>   	int ret;
> +	int i = 0;
>
>   	dev_dbg(dev, "%s\n", __func__);
>
> -	ret = pm_generic_runtime_suspend(dev);
> -	if (ret)
> -		return ret;
> -
> -	ret = pm_clk_suspend(dev);
> +	ret = pm_clk_create(dev);
>   	if (ret) {
> -		pm_generic_runtime_resume(dev);
> -		return ret;
> +		dev_err(dev, "pm_clk_create failed %d\n", ret);
> +		return;
> +	};
> +
> +	while ((clk = of_clk_get(dev->of_node, i++)) && !IS_ERR(clk)) {
> +		ret = pm_clk_add_clk(dev, clk);
> +		if (ret) {
> +			dev_err(dev, "pm_clk_add_clk failed %d\n", ret);
> +			goto clk_err;
> +		};
>   	}
>
> -	return 0;
> +	if (!IS_ENABLED(CONFIG_PM_RUNTIME)) {
Can we not okkup two seperate callbacks instead of above check ?
I don't like this CONFIG check here. Its slightly better version of
ifdef in middle of the code.

Regards,
Santosh

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