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

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Message-ID: <561C2A1B.3000201@ti.com>
Date:	Tue, 13 Oct 2015 03:16:03 +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 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.

Since PCIe itself has a bunch of registers for itself, thought of
creating a separate dt node. But I can extend scm_conf1 area.

Thanks
Kishon
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