linux-kernel - Re: [PATCH V7 12/15] arm64: tegra: Enable PCIe slots in P2972-0000 board

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Message-ID: <6a2c0a9a-1c37-3e32-535a-aaf0db2f101d@nvidia.com>
Date:   Tue, 21 May 2019 23:47:45 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <jonathanh@...dia.com>, <kishon@...com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <jingoohan1@...il.com>,
        <gustavo.pimentel@...opsys.com>, <mperttunen@...dia.com>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V7 12/15] arm64: tegra: Enable PCIe slots in P2972-0000
 board

On 5/21/2019 4:24 PM, Thierry Reding wrote:
> On Fri, May 17, 2019 at 06:08:43PM +0530, Vidya Sagar wrote:
>> Enable PCIe controller nodes to enable respective PCIe slots on
>> P2972-0000 board. Following is the ownership of slots by different
>> PCIe controllers.
>> Controller-0 : M.2 Key-M slot
>> Controller-1 : On-board Marvell eSATA controller
>> Controller-3 : M.2 Key-E slot
>>
>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>> ---
>> Changes since [v6]:
>> * None
>>
>> Changes since [v5]:
>> * Arranged PCIe nodes in the order of their addresses
>>
>> Changes since [v4]:
>> * None
>>
>> Changes since [v3]:
>> * None
>>
>> Changes since [v2]:
>> * Changed P2U label names to reflect new format that includes 'hsio'/'nvhs'
>>    strings to reflect UPHY brick they belong to
>>
>> Changes since [v1]:
>> * Dropped 'pcie-' from phy-names property strings
>>
>>   .../arm64/boot/dts/nvidia/tegra194-p2888.dtsi |  2 +-
>>   .../boot/dts/nvidia/tegra194-p2972-0000.dts   | 41 +++++++++++++++++++
>>   2 files changed, 42 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
>> index 0fd5bd29fbf9..30a83d4c5b69 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
>> +++ b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
>> @@ -191,7 +191,7 @@
>>   						regulator-boot-on;
>>   					};
>>   
>> -					sd3 {
>> +					vdd_1v8ao: sd3 {
>>   						regulator-name = "VDD_1V8AO";
>>   						regulator-min-microvolt = <1800000>;
>>   						regulator-max-microvolt = <1800000>;
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> index 73801b48d1d8..a22704e76a84 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> +++ b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> @@ -167,4 +167,45 @@
>>   			};
>>   		};
>>   	};
>> +
>> +	pcie@...00000 {
>> +		status = "okay";
>> +
>> +		vddio-pex-ctl-supply = <&vdd_1v8ao>;
>> +
>> +		phys = <&p2u_hsio_0>;
>> +		phy-names = "p2u-0";
>> +	};
>> +
>> +	pcie@...40000 {
>> +		status = "okay";
>> +
>> +		vddio-pex-ctl-supply = <&vdd_1v8ao>;
>> +
>> +		phys = <&p2u_hsio_7>;
>> +		phy-names = "p2u-0";
>> +	};
>> +
>> +	pcie@...80000 {
>> +		status = "okay";
>> +
>> +		vddio-pex-ctl-supply = <&vdd_1v8ao>;
>> +
>> +		phys = <&p2u_hsio_2>, <&p2u_hsio_3>, <&p2u_hsio_4>,
>> +		       <&p2u_hsio_5>;
>> +		phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3";
>> +	};
>> +
>> +	pcie@...a0000 {
>> +		status = "disabled";
>> +
>> +		vddio-pex-ctl-supply = <&vdd_1v8ao>;
>> +
>> +		phys = <&p2u_nvhs_0>, <&p2u_nvhs_1>, <&p2u_nvhs_2>,
>> +		       <&p2u_nvhs_3>, <&p2u_nvhs_4>, <&p2u_nvhs_5>,
>> +		       <&p2u_nvhs_6>, <&p2u_nvhs_7>;
>> +
>> +		phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3", "p2u-4",
>> +			    "p2u-5", "p2u-6", "p2u-7";
>> +	};
> 
> This last controller is disabled by default. Why do we need to include
> all of this if it's not going to be used anyway?
I want to keep this entry ready by populating all the required fields. When pinctrl
driver is ready, I'll send out patches to enable this node as well.

> 
> Thierry
>