[QUESTION] How to set static/dynamic dependency between clock domains

[Cousson, Benoit]

Hi Santosh,

On 12/23/2011 9:45 AM, Shilimkar, Santosh wrote:
> On Fri, Dec 23, 2011 at 2:00 PM, Ming Lei<tom.leiming at gmail.com>  wrote:

[...]

>> The only change on iss(CAM) clock domain setting in your commit[1] is to
>> configure CLKTRCTRL as HW_AUTO, instead of previous  SW_WKUP.
>> Once I change flags of iss to CLKDM_CAN_SWSUP [2], the issue can be
>> fixed, so I am wondering if something is wrong about HW_AUTO mode
>> of CAM clock domain.
>>
> Now I recollect the issue and also track a patch in the internal product tree.
> Same is attached and also in the end of the email.
>
> I am lopping Miguel who wrote the patch and Benoit who acked it.
> This should sort out your issue as you have already verified it works.

Ooops, that remains me that I forgot to push it upstream:-(

Since this is a bug fix, if this is too late for 3.3, we can try to push 
it during rc phases.

Paul,

Is that fine for you?

Regards,
Benoit

> From 972d7bb544d3197d7fc1a6c6eb0e2c9cc08d5e9d Mon Sep 17 00:00:00 2001
> From: Miguel Vadillo<vadillo at ti.com>
> Date: Tue, 21 Jun 2011 09:59:45 -0500
> Subject: [PATCH 1/2] OMAP: clockdomain: set iss clk domain to just SWSUP
>
> Since CAM domain(ISS) has no module wake-up dependency
> with any other clock domain of the device and the dynamic
> dependency from L3_main_2 is always disabled, the domain
> needs to be in force wakeup in order to be able to access
> it for configure(sysconfig) it or use it.
>
> Also since there is no clock in the domain managed automatically
> by the hardware, there is no use to configure automatic
> clock domain transition. SW should keep the SW_WKUP domain
> transition as long as a module in the domain is required to
> be functional.
>
> Signed-off-by: Miguel Vadillo<vadillo at ti.com>
> Acked-by: Benoit Cousson<b-cousson at ti.com>
> ---
>   arch/arm/mach-omap2/clockdomains44xx_data.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/clockdomains44xx_data.c
> b/arch/arm/mach-omap2/clockdomains44xx_data.c
> index 6ac8fe2..8d1a061 100644
> --- a/arch/arm/mach-omap2/clockdomains44xx_data.c
> +++ b/arch/arm/mach-omap2/clockdomains44xx_data.c
> @@ -605,7 +605,7 @@ static struct clockdomain iss_44xx_clkdm = {
>   	.clkdm_offs	  = OMAP4430_CM2_CAM_CAM_CDOFFS,
>   	.wkdep_srcs	  = iss_wkup_sleep_deps,
>   	.sleepdep_srcs	  = iss_wkup_sleep_deps,
> -	.flags		  = CLKDM_CAN_HWSUP_SWSUP,
> +	.flags		  = CLKDM_CAN_SWSUP,
>   	.omap_chip	  = OMAP_CHIP_INIT(CHIP_IS_OMAP44XX),
>   };
>