Date:	Mon, 5 Nov 2012 11:17:37 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	Sekhar Nori <nsekhar@...com>
CC:	<mturquette@...aro.org>, <arnd@...db.de>,
	<akpm@...ux-foundation.org>, <shawn.guo@...aro.org>,
	<rob.herring@...xeda.com>, <linus.walleij@...aro.org>,
	<viresh.linux@...il.com>, <linux-kernel@...r.kernel.org>,
	<khilman@...com>, <linux@....linux.org.uk>, <sshtylyov@...sta.com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-keystone@...t.ti.com>
Subject: Re: [PATCH v3 06/11] clk: davinci - add build infrastructure for
 DaVinci clock drivers

On 11/04/2012 08:34 AM, Sekhar Nori wrote:
> On 10/25/2012 9:41 PM, Murali Karicheri wrote:
>> This updates clk Makefile and Kconfig to integrate the DaVinci specific
>> clock drivers. Also add new Kconfig and Makefile for these drivers.
>>
>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> As mentioned before, this should be folded into previous patches which
> actually add the particular functionality.
Yes. Agreed.,
>> ---
>>   drivers/clk/Kconfig          |    2 ++
>>   drivers/clk/Makefile         |    1 +
>>   drivers/clk/davinci/Kconfig  |   44 ++++++++++++++++++++++++++++++++++++++++++
>>   drivers/clk/davinci/Makefile |    5 +++++
>>   4 files changed, 52 insertions(+)
>>   create mode 100644 drivers/clk/davinci/Kconfig
>>   create mode 100644 drivers/clk/davinci/Makefile
>>
>> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
>> index 7f0b5ca..1ad2ab0 100644
>> --- a/drivers/clk/Kconfig
>> +++ b/drivers/clk/Kconfig
>> @@ -33,6 +33,8 @@ config COMMON_CLK_DEBUG
>>   	  clk_flags, clk_prepare_count, clk_enable_count &
>>   	  clk_notifier_count.
>>   
>> +source "drivers/clk/davinci/Kconfig"
>> +
>>   config COMMON_CLK_WM831X
>>   	tristate "Clock driver for WM831x/2x PMICs"
>>   	depends on MFD_WM831X
>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
>> index 5869ea3..b127b6f 100644
>> --- a/drivers/clk/Makefile
>> +++ b/drivers/clk/Makefile
>> @@ -10,6 +10,7 @@ obj-$(CONFIG_ARCH_SOCFPGA)	+= socfpga/
>>   obj-$(CONFIG_PLAT_SPEAR)	+= spear/
>>   obj-$(CONFIG_ARCH_U300)		+= clk-u300.o
>>   obj-$(CONFIG_ARCH_INTEGRATOR)	+= versatile/
>> +obj-$(CONFIG_DAVINCI_CLKS)	+= davinci/
>>   
>>   # Chip specific
>>   obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
>> diff --git a/drivers/clk/davinci/Kconfig b/drivers/clk/davinci/Kconfig
>> new file mode 100644
>> index 0000000..e53bbc3
>> --- /dev/null
>> +++ b/drivers/clk/davinci/Kconfig
>> @@ -0,0 +1,44 @@
>> +menu "TI DaVinci Clock drivers"
>> +	depends on COMMON_CLK
>> +
>> +config  CLK_DAVINCI_PSC
>> +	bool "TI DaVici PSC clock driver"
>> +	default n
>> +	---help---
>> +	  Selects clock driver for DaVinci PSC clocks. This clock
>> +	  hardware is found on TI DaVinci SoCs and other SoCs that
>> +	  uses this hardware IP. This hardware has a local power
>> +	  sleep control module that gate the clock to the IP.
>> +
>> +config  CLK_DAVINCI_PLL
>> +	bool "DaVici main PLL clock"
>> +	---help---
>> +	  Selects clock driver for DaVinci main PLL. This clock
>> +	  hardware is found on TI DaVinci SoCs. This typically has
>> +	  a multiplier, a pre divider and post driver. Some of the
>> +	  SoCs has the the dividers fixed, and others have it
>> +	  programmable
>> +
>> +config  CLK_DAVINCI_PLLDIV
>> +	bool "DaVici PLL divider clock"
>> +	---help---
>> +	  Selects clock driver for DaVinci PLL divider. This clock
>> +	  hardware is found on TI DaVinci SoCs. This typically has
>> +	  a divider and an enable bit to bypass or enable the
>> +	  divider.
>> +
>> +config DAVINCI_CLKS
>> +	bool "TI DaVinci common clocks"
>> +	default n
>> +	select CLK_DAVINCI_PSC
>> +	select CLK_DAVINCI_PLLDIV
>> +	---help---
>> +	  Selects common clock drivers for DaVinci. These clocks
>> +	  are re-used across many TI SoCs that are based on DaVinci and
>> +	  Keystone (c6x) families. This config option is used to select
>> +	  the common clock driver for DaVinci based SoCs. SoCs specific
>> +	  Kconfig option needs to select the driver for clocks specific
>> +	  to the SoC.
>> +
>> +endmenu
> I wonder if all these configurations are really required. For complete
> clock functionality you anyway require all this functionality so I
> wonder why anyone would not select any of these. And to differentiate
> between architecture changes, conditional build based on architecture
> can be used:
I know this is a grey area I need to improve and had a discussion with 
Mike sometime back. Are you also suggesting including davinci folder 
unconditionally under drivers/clk/Makefile? I think it will work. And 
then in clk/davinci/Makefile we can include on a per architecture basis. 
But I am not sure if calling the folder as davinci make sense and these 
drivers are used on non DaVinci architectures as well. I had initially 
named it as "ti" to include all ti drivers. But Mike had commented that 
current directory structure use platform/arch name instead of vendor 
name. Also OMAP is going to move the clk drivers to this folder soon. So 
for now, davinci may be used to house all of the non OMAP drivers. Later 
we can re-visit this as needed (wouldn't be that hard to do this within 
the clk driver folder later). We can keep the davinci folder name and 
unconditionally include it in clk/Makefile.

clk/Makefile

add
obj-y      += davinci/

clk/davinci/Makefile

obj-$(CONFIG_ARCH_DAVINCI) += clk-pll.o clk-div.o clk-psc.o clock.o
obj-$(CONFIG_ARCH_KEYSTONE) +=   clk-pll-keystone.o clk-div.o clk-psc.o clock.o
obj-$(CONFIG_ARCH_DAVINCI_DM644x) += clk-dm644x.o
obj-$(CONFIG_ARCH_DAVINCI_DM355) += clk-dm355.o


This way I can remove these config options. Are you okay with this?

>
> obj-$(CONFIG_ARCH_DAVINCI)	+= clk-pll.o
> obj-$(CONFIG_ARCH_KEYSTONE)	+= clk-pll-keystone.o
>
> Thanks,
> Sekhar
>

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