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 03:35:07 +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 03:33 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.

Thanks
Kishon
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