linux-kernel - Re: [PATCH v3 08/10] clk: ns2: add clock support for Broadcom Northstar 2 SoC

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Date:	Thu, 15 Oct 2015 13:55:04 -0700
From:	Ray Jui <rjui@...adcom.com>
To:	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>
CC:	Florian Fainelli <f.fainelli@...il.com>,
	Hauke Mehrtens <hauke@...ke-m.de>, <linux-clk@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v3 08/10] clk: ns2: add clock support for Broadcom
 Northstar 2 SoC



On 10/15/2015 1:40 PM, Scott Branden wrote:
> We need some sort of kconfig option to differentiate NS2 clock driver
> from being pulled in all the time.
> 
> On 15-10-15 12:48 PM, Jon Mason wrote:
>> The Broadcom Northstar 2 SoC is architected under the iProc
>> architecture. It has the following PLLs: GENPLL SCR, GENPLL SW,
>> LCPLL DDR, LCPLL Ports, all derived from an onboard crystal.
>>
>> Signed-off-by: Jon Mason <jonmason@...adcom.com>
>> ---
>>   drivers/clk/Makefile                |   2 +-
>>   drivers/clk/bcm/Makefile            |   1 +
>>   drivers/clk/bcm/clk-ns2.c           | 288
>> ++++++++++++++++++++++++++++++++++++
>>   include/dt-bindings/clock/bcm-ns2.h |  72 +++++++++
>>   4 files changed, 362 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/clk/bcm/clk-ns2.c
>>   create mode 100644 include/dt-bindings/clock/bcm-ns2.h
>>
>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
>> index d08b3e5..6124bd3 100644
>> --- a/drivers/clk/Makefile
>> +++ b/drivers/clk/Makefile
>> @@ -47,7 +47,7 @@ obj-$(CONFIG_COMMON_CLK_WM831X)        += clk-wm831x.o
>>   obj-$(CONFIG_COMMON_CLK_XGENE)        += clk-xgene.o
>>   obj-$(CONFIG_COMMON_CLK_PWM)        += clk-pwm.o
>>   obj-$(CONFIG_COMMON_CLK_AT91)        += at91/
>> -obj-$(CONFIG_ARCH_BCM)            += bcm/
>> +obj-y                    += bcm/
>>   obj-$(CONFIG_ARCH_BERLIN)        += berlin/
>>   obj-$(CONFIG_ARCH_HISI)            += hisilicon/
>>   obj-$(CONFIG_ARCH_MXC)            += imx/
>> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
>> index e258b28..2d1cbc5 100644
>> --- a/drivers/clk/bcm/Makefile
>> +++ b/drivers/clk/bcm/Makefile
>> @@ -3,6 +3,7 @@ obj-$(CONFIG_CLK_BCM_KONA)    += clk-kona-setup.o
>>   obj-$(CONFIG_CLK_BCM_KONA)    += clk-bcm281xx.o
>>   obj-$(CONFIG_CLK_BCM_KONA)    += clk-bcm21664.o
>>   obj-$(CONFIG_COMMON_CLK_IPROC)    += clk-iproc-armpll.o
>> clk-iproc-pll.o clk-iproc-asiu.o
>> +obj-$(CONFIG_COMMON_CLK_IPROC)    += clk-ns2.o
> 
> NS2 code is dragged in for all IPROC SoCs.  We need a config option for
> NS2 (CONFIG_ARCH_BCM_NS2) to avoid this (if Arnd allows this for ARMv8
> processors... ?).
> 
> You can see below ARMv7 processors don't have this problem.
> 

The arm64 maintainers (Catalin, Mark, and etc.) stated they only want
one ARCH options per chip family.

> If not we need to add CONFIG_CLK_NS2.

If using CONFIG_CLK_NS2, how is it going to be enabled/selected?

Ray
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