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SubjectRe: [PATCH v2 2/3] ARM: keystone: pm: switch to use generic pm domains
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On 22 October 2014 13:23, Grygorii Strashko <grygorii.strashko@ti.com> wrote:
> Hi Santosh,
>
> On 10/21/2014 09:05 PM, Santosh Shilimkar wrote:
>> 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@linaro.org>
>>> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.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.
>
> ok.
>
>>
>>> +bindings in Documentation/devicetree/bindings/power/power_domain.txt.
>>> +
>>> +Example:
>>> +
>>> + pm_controller: pm-controller {
>>> + compatible = "ti,keystone-powerdomain";
>>> + #power-domain-cells = <0>;
>>> + };
>>> +
>>> + netcp: netcp@2090000 {
>>> + 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.
>
> I've found more-less similar comment on patch
> "Re: [PATCH v3 1/3] power-domain: add power domain drivers for Rockchip platform"
> https://lkml.org/lkml/2014/10/17/257
>
> So, Would you like me to create patch which will enable clocks in pm_clk_add/_clk()
> in case !IS_ENABLED(CONFIG_PM_RUNTIME)

I am wondering whether we actually should/could do this, no matter of
CONFIG_PM_RUNTIME.

Typically, for configurations that uses CONFIG_PM_RUNTIME, the PM
clocks through pm_clk_suspend(), will be gated once the device becomes
runtime PM suspended. Right?

Kind regards
Uffe


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