linux-kernel - [PATCH V5 4/5] arm64: tegra: Add support for PCIe endpoint mode in P2972-0000 platform

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Date:   Tue, 3 Mar 2020 23:40:51 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <robh+dt@...nel.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <andrew.murray@....com>
CC:     <kishon@...com>, <gustavo.pimentel@...opsys.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>, <vidyas@...dia.com>, <sagar.tv@...il.com>
Subject: [PATCH V5 4/5] arm64: tegra: Add support for PCIe endpoint mode in P2972-0000 platform

Add endpoint mode support for PCIe C5 controller in P2972-0000 platform
with information about supplies, PHY, PERST GPIO and GPIO that controls
PCIe reference clock coming from the host system.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
V5:
* None

V4:
* None

V3:
* None

V2:
* Addressed Thierry's review comments
* Changed 'nvidia,pex-rst-gpio' to 'reset-gpios'
* Added 'nvidia,refclk-select-gpios'

 .../boot/dts/nvidia/tegra194-p2972-0000.dts    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
index 985e7d84f161..734eb294d1e6 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
@@ -136,6 +136,24 @@
 			    "p2u-5", "p2u-6", "p2u-7";
 	};
 
+	pcie_ep@...a0000 {
+		status = "disabled";
+
+		vddio-pex-ctl-supply = <&vdd_1v8ao>;
+
+		reset-gpios = <&gpio TEGRA194_MAIN_GPIO(GG, 1) GPIO_ACTIVE_LOW>;
+
+		nvidia,refclk-select-gpios = <&gpio_aon TEGRA194_AON_GPIO(AA, 5)
+					      GPIO_ACTIVE_HIGH>;
+
+		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";
+	};
+
 	fan: fan {
 		compatible = "pwm-fan";
 		pwms = <&pwm4 0 45334>;
-- 
2.17.1