linux-kernel - [PATCH v4] arm64: dts: qcom: sa8540p-ride: enable PCIe support

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Message-Id: <20221206161916.315640-1-bmasney@redhat.com>
Date:   Tue,  6 Dec 2022 11:19:16 -0500
From:   Brian Masney <bmasney@...hat.com>
To:     andersson@...nel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     agross@...nel.org, konrad.dybcio@...aro.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_shazhuss@...cinc.com,
        psodagud@...cinc.com, ahalaney@...hat.com, echanude@...hat.com
Subject: [PATCH v4] arm64: dts: qcom: sa8540p-ride: enable PCIe support

Add the vreg_l11a, pcie3a, pcie3a_phy, and tlmm nodes that are necessary
in order to get PCIe working on the QDrive3.

This patch also increases the width of the ranges property for the PCIe
switch that's found on this platform. Note that this change requires
the latest trustzone (TZ) firmware that's available from Qualcomm as
of November 2022. If this is used against a board with the older
firmware, then the board will go into ramdump mode when PCIe is probed
on startup.

The ranges property is overridden in this sa8540p-ride.dts file since
this is what's used to describe the QDrive3 variant with dual SoCs.
There's another variant of this board that only has a single SoC where
this change is not applicable, and hence why this specific change was
not done in sa8540p.dtsi.

These changes were derived from various patches that Qualcomm
delivered to Red Hat in a downstream kernel.

Signed-off-by: Brian Masney <bmasney@...hat.com>
Tested-by: Andrew Halaney <ahalaney@...hat.com>
Tested-by: Shazad Hussain <quic_shazhuss@...cinc.com>
---
Changes since v3:
- Move tlmm node to bottom of file and add PINCTRL comment (Johan)
- Collect Tested-by tags from Andrew and Shazad

Changes since v2:
- Dropped regulator-allow-set-load (Bjorn)
- Updated first member of ranges property to match downstream:
  s/0x32200000/0x40200000/ (Andrew)

Changes since v1:
- Add -state and -pins suffixes to tlmm (Krzysztof)

This patch depends on the following series that hasn't made it's way
into linux-next yet:

[PATCH v10 0/2] arm64: dts: qcom: add dts for sa8540p-ride board
https://lore.kernel.org/lkml/20221118025158.16902-1-quic_ppareek@quicinc.com/

I can't find the specific TZ firmware version that we have so that's why
I included the date instead.

 arch/arm64/boot/dts/qcom/sa8540p-ride.dts | 55 +++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sa8540p-ride.dts b/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
index a5f87a8629d6..bb4afd3a9632 100644
--- a/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
+++ b/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
@@ -51,6 +51,13 @@ vreg_l7a: ldo7 {
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 		};
 
+		vreg_l11a: ldo11 {
+			regulator-name = "vreg_l11a";
+			regulator-min-microvolt = <880000>;
+			regulator-max-microvolt = <880000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+
 		vreg_l13a: ldo13 {
 			regulator-name = "vreg_l13a";
 			regulator-min-microvolt = <3072000>;
@@ -139,6 +146,27 @@ vreg_l8g: ldo8 {
 	};
 };
 
+&pcie3a {
+	ranges = <0x01000000 0x0 0x40200000 0x0 0x40200000 0x0 0x100000>,
+	         <0x02000000 0x0 0x40300000 0x0 0x40300000 0x0 0x20000000>,
+	         <0x03000000 0x6 0x00000000 0x6 0x00000000 0x2 0x00000000>;
+
+	perst-gpios = <&tlmm 151 GPIO_ACTIVE_LOW>;
+	wake-gpios = <&tlmm 56 GPIO_ACTIVE_HIGH>;
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie3a_default>;
+
+	status = "okay";
+};
+
+&pcie3a_phy {
+	vdda-phy-supply = <&vreg_l11a>;
+	vdda-pll-supply = <&vreg_l3a>;
+
+	status = "okay";
+};
+
 &qup2 {
 	status = "okay";
 };
@@ -215,3 +243,30 @@ &usb_2_qmpphy0 {
 &xo_board_clk {
 	clock-frequency = <38400000>;
 };
+
+/* PINCTRL */
+
+&tlmm {
+	pcie3a_default: pcie3a-default-state {
+		perst-pins {
+			pins = "gpio151";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-down;
+		};
+
+		clkreq-pins {
+			pins = "gpio150";
+			function = "pcie3a_clkreq";
+			drive-strength = <2>;
+			bias-pull-up;
+		};
+
+		wake-pins {
+			pins = "gpio56";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-up;
+		};
+	};
+};
-- 
2.38.1