linux-kernel - Re: [PATCH v2 1/4] ARM: dts: dra7: Add dt node for the sycon pcie

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Date:	Tue, 13 Oct 2015 03:48:31 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	<linux-kernel@...r.kernel.org>, <bcousson@...libre.com>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<nsekhar@...com>, <linux@....linux.org.uk>
Subject: Re: [PATCH v2 1/4] ARM: dts: dra7: Add dt node for the sycon pcie

Hi,

On Tuesday 13 October 2015 03:42 AM, Tony Lindgren wrote:
> * Kishon Vijay Abraham I <kishon@...com> [151012 15:09]:
>> Hi,
>>
>> On Tuesday 13 October 2015 03:33 AM, Tony Lindgren wrote:
>>> * Kishon Vijay Abraham I <kishon@...com> [151012 14:50]:
>>>> Hi Tony,
>>>>
>>>> On Tuesday 13 October 2015 02:51 AM, Tony Lindgren wrote:
>>>>> * Kishon Vijay Abraham I <kishon@...com> [150915 06:37]:
>>>>>> Add new device tree node for the control module register space where
>>>>>> PCIe registers are present.
>>>>>>
>>>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>>>>> ---
>>>>>>  arch/arm/boot/dts/dra7.dtsi |    5 +++++
>>>>>>  1 file changed, 5 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
>>>>>> index 5d65db9..0769b5d 100644
>>>>>> --- a/arch/arm/boot/dts/dra7.dtsi
>>>>>> +++ b/arch/arm/boot/dts/dra7.dtsi
>>>>>> @@ -154,6 +154,11 @@
>>>>>>  					compatible = "syscon";
>>>>>>  					reg = <0x1c04 0x0020>;
>>>>>>  				};
>>>>>> +
>>>>>> +				scm_conf_pcie: tisyscon@...4 {
>>>>>> +					compatible = "syscon";
>>>>>> +					reg = <0x1c24 0x0024>;
>>>>>> +				};
>>>>>>  			};
>>>>>>  
>>>>>>  			cm_core_aon: cm_core_aon@...0 {
>>>>>
>>>>>
>>>>> Why don't you just extend the existing scm_conf1 area? This is not all pcie
>>>>> specific for scm_conf_pcie, at least for PLLEN_CONTROL, RMII_CLK_SETTING
>>>>> and MUXSEL_32K_CLKIN.
>>>>
>>>> scm_conf_pcie has only PCIe registers (it starts at 0x4A003C24).
>>>> PLLEN_CONTROL and others are at 0x4A003C14 as per
>>>> DRA75x_DRA74x_SR1.1_NDA_TRM_vW.
>>>
>>> Oh sorry I guess I was looking at a wrong address then.
>>>
>>>> Since PCIe itself has a bunch of registers for itself, thought of
>>>> creating a separate dt node. But I can extend scm_conf1 area.
>>>
>>> Why not just ioremap them then? Do these need to be shared with
>>> some other driver?
>>
>> yeah, some are used by PCIe controller driver and some are used by PCIe
>> PHY driver.
> 
> OK makes sense to me then.

Cool.

Btw the driver modifications has not yet been merged, so don't merge
these yet. I'll repost these once the driver is merged.

Thanks
Kishon
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