linux-kernel - Re: [PATCH 2/3] soc: ti: Add wkup_m3

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Message-ID: <20150227170928.GZ11056@atomide.com>
Date:	Fri, 27 Feb 2015 09:09:29 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Dave Gerlach <d-gerlach@...com>
Cc:	balbi@...com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org, Benoit Cousson <bcousson@...libre.com>,
	Ohad Ben-Cohen <ohad@...ery.com>, Suman Anna <s-anna@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: [PATCH 2/3] soc: ti: Add wkup_m3_ipc driver

* Dave Gerlach <d-gerlach@...com> [150227 09:04]:
> Tony,
> On 02/26/2015 04:08 PM, Tony Lindgren wrote:
> > * Dave Gerlach <d-gerlach@...com> [150226 12:05]:
> >> Tony,
> >> On 01/05/2015 04:51 PM, Tony Lindgren wrote:
> >>> * Dave Gerlach <d-gerlach@...com> [150105 14:51]:
> >>>> Felipe,
> >>>> On 01/02/2015 02:16 PM, Felipe Balbi wrote:
> >>>>> On Fri, Jan 02, 2015 at 02:00:16PM -0600, Dave Gerlach wrote:
> >>>>>> Introduce a wkup_m3_ipc driver to handle communication between the MPU
> >>>>>> and Cortex M3 wkup_m3 present on am335x.
> >>>>>>
> >>>>>> This driver is responsible for actually booting the wkup_m3_rproc and
> >>>>>> also handling all IPC which is done using the IPC registers in the control
> >>>>>> module, a mailbox, and a separate interrupt back from the wkup_m3. A small
> >>>>>> API is exposed for executing specific power commands, which include
> >>>>>> configuring for low power mode, request a transition to a low power mode,
> >>>>>> and status info on a previous transition.
> >>>>>>
> >>>>>> Signed-off-by: Dave Gerlach <d-gerlach@...com>
> >>>>>> ---
> >>>>>>  drivers/soc/ti/Kconfig       |  11 ++
> >>>>>>  drivers/soc/ti/Makefile      |   1 +
> >>>>>>  drivers/soc/ti/wkup_m3_ipc.c | 451 +++++++++++++++++++++++++++++++++++++++++++
> >>>>>>  include/linux/wkup_m3_ipc.h  |  33 ++++
> >>>>>>  4 files changed, 496 insertions(+)
> >>>>>>  create mode 100644 drivers/soc/ti/wkup_m3_ipc.c
> >>>>>>  create mode 100644 include/linux/wkup_m3_ipc.h
> >>>>>>
> >>>>>> diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig
> >>>>>> index 7266b21..61cda85 100644
> >>>>>> --- a/drivers/soc/ti/Kconfig
> >>>>>> +++ b/drivers/soc/ti/Kconfig
> >>>>>> @@ -28,4 +28,15 @@ config KEYSTONE_NAVIGATOR_DMA
> >>>>>>  
> >>>>>>  	  If unsure, say N.
> >>>>>>  
> >>>>>> +config WKUP_M3_IPC
> >>>>>> +	bool "TI AM33XX Wkup-M3 IPC Driver"
> >>>>>
> >>>>> tristate ?
> >>>>
> >>>> If we want to allow this and the rproc driver to be built as modules than we can
> >>>> change this.
> >>>
> >>> Yes please, the PM is never needed early, and should be optional.
> >>> And doing that will make it a lot easier for you to do further work
> >>> on your driver ;)
> >>>
> >>> And it will also make it easier to add support for other SoCs as
> >>> it seems the same M3 is used at least on am437x.
> >>>  
> >>
> >> I can not build the PM code as a module at this time due to many mach-omap
> >> function calls it uses which are not exported, so I need handles to all five
> >> functions in this driver used in pm33xx to call from built-in PM code. Do you
> >> have a preference on how these function handles get passed?
> > 
> > OK, you can pass the function pointers in platform_data. Care to
> > list those functions? That might allow us to make other omap PM
> > code into loadable modules in drivers/* :)
> 
> Sure, apart from the dependencies I create for myself in other modules that I
> introduce I see:
> 
> ERROR: "omap_pm_clkdms_setup" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "clkdm_for_each" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "clkdm_lookup" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "pwrdm_lookup" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "pwrdm_post_transition" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "clkdm_sleep" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "clkdm_wakeup" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "pwrdm_read_pwrst" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "cpu_suspend" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> ERROR: "omap_set_pwrdm_state" [arch/arm/mach-omap2/pm33xx.ko] undefined!
> 
> So the mach-omap2 clockdomain and power domain functions along with arch arm
> cpu_suspend code. I see similar dependencies in the other mach-omap2/pmxxxx.c
> code also.

OK thanks for the list.

Regards,

Tony
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