linux-kernel - Re: [PATCH 1/2] ARM: dts: keystone: fix the clock node for mdio

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Date:	Mon, 3 Aug 2015 14:50:20 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	"santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <ssantosh@...nel.org>
Subject: Re: [PATCH 1/2] ARM: dts: keystone: fix the clock node for mdio

On 08/03/2015 02:30 PM, santosh.shilimkar@...cle.com wrote:
> On 8/3/15 11:22 AM, Murali Karicheri wrote:
>> On 08/03/2015 02:11 PM, Murali Karicheri wrote:
>>> Currently the MDIO clock is pointing to clkpa instead of clkcpgmac.
>>> MDIO is part of the ethss and the clock should be clkcpgmac.
>>>
>>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>>> ---
>>>   arch/arm/boot/dts/keystone.dtsi | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/boot/dts/keystone.dtsi
>>> b/arch/arm/boot/dts/keystone.dtsi
>>> index e7a6f6d..6245a17 100644
>>> --- a/arch/arm/boot/dts/keystone.dtsi
>>> +++ b/arch/arm/boot/dts/keystone.dtsi
>>> @@ -273,7 +273,7 @@
>>>               #size-cells = <0>;
>>>               reg        = <0x02090300 0x100>;
>>>               status = "disabled";
>>> -            clocks = <&clkpa>;
>>> +            clocks = <&clkcpgmac>;
>>>               clock-names = "fck";
>>>               bus_freq    = <2500000>;
>>>           };
>>>
>> Santosh,
>>
>> This is a big fix and needs to go in v4.2-rc. So please review and apply
>> asap. v4.2 is the first release that has netcp driver fully functional
>> and I want to fix as many known bugs as possible.
>>
> Do you have more fixes ? If yes, please post them so that I can include
> them along with these two. I will try to send them up next week.

I think we have got most of the know issues fixed in the netcp driver 
and dts for v4.2-rc. Another lingering issue is the one with multiple 
clock handling not supported in run time pm API causing us to use the 
work around 'clk_ignore_unused'. Probably this needs to be addressed in 
the future as fixing this is not trivial. Generic PD support would 
partially solve the issue for Keystone, but also needs to handle 
multiple clocks for keystone.

Another option is to  fix the NetCP and QMSS/KNAV driver for now in 
v4.0-rc using explicit clock APIs so that we don't have to use 
'clk_ignore_unused'. And then migrate all of the drivers to run time PM 
API later when proper framework is implemented along with K2G support. 
Does this make sense?

Anyways, please submit these patches at your earliest opportunity.

Thanks

Murali

>
> Thanks !!
>
> Regards,
> Santosh
>
>


-- 
Murali Karicheri
Linux Kernel, Keystone
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